SHEFFIELD PHARMACEUTICALS INC
8-K, 1999-11-02
PHARMACEUTICAL PREPARATIONS
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549


                                    FORM 8-K


                                 CURRENT REPORT

                         PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934




Date of Report (Date of earliest event reported): October 18, 1999




                         SHEFFIELD PHARMACEUTICALS, INC.
             ------------------------------------------------------
             (Exact name of Registrant as specified in its charter)




          Delaware                       1-12584                13-3808303
- --------------------------------------------------------------------------------
(State or other jurisdiction           (Commission           (I.R.S. Employer
   of incorporation)                   File Number)            Identification
                                                                Number)



               425 South Woodsmill Road, St. Louis, Missouri 63017
               -------------------------------------------------------
               (Address of Principal executive offices)     (Zip Code)

                                 (314) 579-9899
               --------------------------------------------------
               Registrant's telephone number, including area code



               --------------------------------------------------
          (Former Name or Former Address; if Changed Since Last Report)


<PAGE>

Item 5.  Other Events.

                  On October 18,  1999,  Sheffield  Pharmaceuticals,  Inc.  (the
"Company")   consummated   a  license  and  financing   transaction   with  Elan
International  Services, Ltd. ("Elan") (an affiliate of Elan Corporation plc, an
Irish pharmaceutical company) in accordance with the terms of the binding letter
of intent dated September 30, 1999 (the "Letter of Intent").

                  As part of the  transaction,  the Company has formed a Bermuda
subsidiary  ("Newco") and entered into several agreements with Elan, including a
Securities Purchase Agreement dated October 18, 1999 (the "Purchase  Agreement")
a Subscription, Joint Development and Operating Agreement dated October 18, 1999
(the "Operating  Agreement"),  and a Registration Rights Agreement dated October
18, 1999 (the "Registration  Rights Agreement").  Elan and the Company have also
licensed  certain of their  intellectual  property  rights to Newco  relating to
certain pulmonary drug delivery systems pursuant to license  agreements.  Copies
of the Purchase  Agreement,  the Operating  Agreement,  the Registration  Rights
Agreement  and the license  agreements  are attached  hereto as exhibits and are
incorporated herein by reference.


Item 7.  Financial Statements, Pro Forma Financial Information and Exhibits.

                  (c) Exhibits

         (4.5)    Certificate of Designations defining the powers, designations,
                  rights,  preferences,  limitations and restrictions applicable
                  to the Company's Series D Cumulative Convertible  Exchangeable
                  Preferred Stock.

         (4.6)    Certificate of Designations defining the powers, designations,
                  rights,  preferences,  limitations and restrictions applicable
                  to  the  Company's   Series  E  Convertible   Non-Exchangeable
                  Preferred Stock.

         (4.7)    Certificate of Designations defining the powers, designations,
                  rights,  preferences,  limitations and restrictions applicable
                  to the Company's Series F Convertible  Exchangeable  Preferred
                  Stock.

         (10.25)  Securities Purchase  Agreement,  dated as of October 18, 1999,
                  by and between the Company and Elan  (portions of this exhibit
                  are omitted and were filed  separately with the Securities and
                  Exchange  Commission  pursuant  to the  Company's  application
                  requesting  confidential  treatment  in  accordance  with Rule
                  24b-2 as  promulgated  under the  Securities  Exchange  Act of
                  1934, as amended).


                                       -2-

<PAGE>

         (10.26)  Subscription,  Joint Development and Operating Agreement dated
                  as of October 18, 1999 by and among Elan Pharma  International
                  Limited,  Elan,  the  Company  and  Newco.  (portions  of this
                  exhibit  are  omitted  and  were  filed  separately  with  the
                  Securities and Exchange  Commission  pursuant to the Company's
                  application  requesting  confidential  treatment in accordance
                  with Rule 24b-2 as promulgated  under the Securities  Exchange
                  Act of 1934, as amended).

         (10.27)  License  Agreement  dated  October 19, 1999 by and between the
                  Company and Newco  (portions  of this  exhibit are omitted and
                  were  filed   separately  with  the  Securities  and  Exchange
                  Commission  pursuant to the Company's  application  requesting
                  confidential  treatment  in  accordance  with  Rule  24b-2  as
                  promulgated  under the  Securities  Exchange  Act of 1934,  as
                  amended).

         (10.28)  License  Agreement  dated October 20, 1999 by and between Elan
                  Pharma  International  Limited  and  Newco  (portions  of this
                  exhibit  are  omitted  and  were  filed  separately  with  the
                  Securities and Exchange  Commission  pursuant to the Company's
                  application  requesting  confidential  treatment in accordance
                  with Rule 24b-2 as promulgated  under the Securities  Exchange
                  Act of 1934, as amended).

         (10.29)  Registration  Rights Agreement dated as of October 18, 1999 by
                  and between Elan and the Company.





                                       -3-

<PAGE>
                                   SIGNATURES


         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the  registrant  has duly  caused  this report to be signed on its behalf by the
undersigned hereunto duly authorized.



                                            SHEFFIELD PHARMACEUTICALS INC.


Date: November 2, 1999                      By: /s/ Loren Peterson
                                                --------------------------------
                                                Loren Peterson
                                                President and
                                                Chief Executive Officer



                                       -4-


                        CERTIFICATE OF DESIGNATIONS,
                             PREFERENCES AND RIGHTS

                                       OF

                  SERIES D CUMULATIVE CONVERTIBLE EXCHANGEABLE
                                 PREFERRED STOCK

                                       OF

                         SHEFFIELD PHARMACEUTICALS, INC.

                                 ---------------

                           Pursuant to Section 151 of
              the General Corporation Law of the State of Delaware


               Sheffield  Pharmaceuticals,  Inc., a  corporation  organized  and
existing  under  the  General  Corporation  Law of the  State of  Delaware  (the
"Corporation"),  hereby  certifies  that the  following  resolutions  were  duly
adopted by the Board of  Directors of the  Corporation  at a meeting duly called
and held on October 15, 1999  pursuant to authority of the Board of Directors as
required by Section 151 of the General Corporation Law of the State of Delaware:

               RESOLVED, that pursuant to the authority expressly granted to and
vested in the Board of Directors of the  Corporation  (the "Board" or the "Board
of  Directors") by the provisions of the  Certificate  of  Incorporation  of the
Corporation (the "Certificate of Incorporation"), out of the 3,000,000 shares of
preferred  stock  of  the  Corporation  authorized  in  Article  FOURTH  of  the
Certificate of Incorporation (the "Preferred Stock"),  there hereby is created a
series of Preferred Stock  consisting of 21,000 shares,  which series shall have
the following  powers,  designations,  preferences and relative,  participating,
optional or other rights,  and the  following  qualifications,  limitations  and
restrictions  (in  addition  to  the  powers,  designations,   rights,  and  the
qualifications,  limitations and  restrictions,  set forth in the Certificate of
Incorporation which are applicable to the Preferred Stock).




<PAGE>
                                    ARTICLE 1
                             DESIGNATION AND AMOUNT

               The  shares  of such  series  shall be  designated  as  "Series D
Cumulative  Convertible  Exchangeable  Preferred Stock" (the "Series D Preferred
Stock") and the authorized  number of shares  constituting  such series shall be
21,000 shares.  The par value of the Series D Preferred  Stock shall be $.01 per
share.  The stated  value of the Series D Preferred  Stock shall be One Thousand
Dollars ($1,000) per share (the "Stated Value").

                                    ARTICLE 2
                                   DEFINITIONS

               The  terms  defined  in  this  Article   whenever  used  in  this
Certificate of Designations have the following respective meanings:

               (a)    "AMEX" means the American Stock Exchange.

               (b)    "Business Day" means a day other than Saturday,  Sunday or
any day on which  banks  located  in the  State of New  York are  authorized  or
obligated to close.

               (c)    "Common  Shares" or "Common  Stock" means shares of common
stock, $.01 par value, of the Corporation.

               (d)    "Conversion  Date"  means  any  day  on  which  all or any
portion of shares of the Series D Preferred  Stock is  converted  in  accordance
with the provisions hereof.

               (e)    "Conversion  Notice"  has the meaning set forth in Section
6.1.

               (f)    "Conversion  Price" has the  meaning  set forth in Section
6.1.

               (g)    "Corporation"  means  Sheffield  Pharmaceuticals,  Inc., a
Delaware  corporation,  and any  successor  or resulting  corporation  by way of
merger,  consolidation,  sale or  exchange  of all or  substantially  all of the
Corporation's assets, or otherwise.

               (h)    "Current Market Price" on any date of determination  means
the closing price of a Common Share on such day as reported on the AMEX,  or, if
such security is not listed or admitted to trading on the AMEX, on the principal
national  security exchange or quotation system on which such security is quoted
or listed or  admitted  to  trading,  or, if not quoted or listed or admitted to
trading on any national  securities exchange or quotation system, the average of
the closing bid and ask prices of such security on the  over-the-counter  market
on  the  day  in  question  as  reported  by  the  National   Quotation   Bureau
Incorporated,  or a similar generally accepted  reporting service,  or if not so
available, in such manner as furnished by any Nasdaq member firm of the National
Association of Securities Dealers,  Inc. selected from time to time by the Board

                                      -2-

<PAGE>
of Directors of the Corporation for that purpose,  or a price determined in good
faith by the Board of  Directors of the  Corporation  as being equal to the fair
market value thereof, as the case may be.

               (i)    "Dividend  Notes"  have the  meaning  set forth in Section
4.1.

               (j)    "Dividend  Payment  Date"  has the  meaning  set  forth in
Section 4.1.

               (k)    "Dividend  Period"  has the  meaning  set forth in Section
4.1.

               (l)    "Dividend  Shares"  means the shares of Series D Preferred
Stock issued as dividends on outstanding  shares of Series D Preferred  Stock in
accordance with Article 4 hereof.

               (m)    "Dollars"  or "$" means  currency of the United  States of
America.

               (n)    "Exchange Date" has the meaning set forth in Section 7.01.

               (o)    "Exchange Note" has the meaning set forth in Section 7.02.

               (p)    "Exchange  Notice"  has the  meaning  set forth in Section
7.01.

               (q)    "Holder" or "Holders" means Elan  International  Services,
Ltd., a Bermuda corporation, any successor thereto, or any Person(s) to whom the
Series D Preferred  Stock is  subsequently  transferred  in accordance  with the
provisions hereof.

               (r)    "Issue  Date" means the date of  original  issuance of the
applicable share of Series D Preferred Stock.

               (s)    "Junior  Securities"  has the meaning set forth in Article
3.

               (t)    "Liquidation  Preference"  has the  meaning  set  forth in
Section 5.1(b).

               (u)    "Newco"  means  Sheffield  Newco Ltd.  a Bermuda  exempted
limited liability company incorporated under the laws of Bermuda.

               (v)    "Newco  Capital  Stock"  means all  outstanding  shares of
Newco Common Stock and all securities convertible or exchangeable into shares of
Newco Common Stock (including, Newco Preferred Stock).

               (w)    "Newco  Common  Stock"  means the  ordinary  shares of the
common stock, par value $1.00 per share, of Newco.

               (x)    "Newco  Preferred  Stock" means the preferred  stock,  par
value $1.00 per share, of Newco.

               (y)    "Original Holder" means Elan International  Services, Ltd,
a Bermuda


                                      -3-
<PAGE>

exempted limited  liability company  incorporated  under the laws of Bermuda and
its  affiliates  (as that term is defined under the  Securities  Exchange Act of
1934, as amended).

               (z)    "Original  Issue  Date"  means  the  date  of the  initial
issuance of shares of Series D Preferred Stock.

               (aa)   "Pari  Passu  Securities"  has the  meaning  set  forth in
Article 3.

               (bb)   "Person"   means   an   individual,   a   corporation,   a
partnership,  an association,  a limited  liability  company,  a  unincorporated
business  organization,  a  trust  or  other  entity  or  organization,  and any
government or political subdivision or any agency or instrumentality thereof.

               (cc)   "Rights" has the meaning set forth in Section 6.2(e).

               (dd)   "Securities   Purchase  Agreement"  means  the  Securities
Purchase  Agreement,  dated as of October 18, 1999,  between the Corporation and
Elan International Services, Ltd.

               (ee)   "Stated Value" has the meaning set forth in Article 1.

               (ff)   "Trading  Day" means any day on which  purchases and sales
of securities  authorized for quotation on the AMEX are reported  thereon or, if
the Common  Stock is not  listed or  admitted  to trading on the AMEX,  a day on
which the principal  national  securities  exchange on which the Common Stock is
listed or admitted to trading is open for the  transaction  of business,  or, if
the  Common  Stock is not so listed  or  admitted  to  trading  on any  national
securities exchange, a day on which the Nasdaq National Market (or any successor
thereto)  or  such  other  system  then in use is open  for the  transaction  of
business,  or, if the Common Stock is not quoted by any such  organization,  any
day other than a Saturday,  Sunday or a day on which banking institutions in the
State of New York are  authorized  or  obligated  by law or  executive  order to
close.

                                    ARTICLE 3
                                      RANK

                The Series D Preferred  Stock shall rank (i) prior to the Common
Stock;  (ii)  prior to any class or series of capital  stock of the  Corporation
hereafter  created  other than Pari  Passu  Securities  (collectively,  with the
Common Stock, the "Junior Securities");  (iii) pari passu with the Corporation's
Series C  Cumulative  Convertible  Preferred  Stock  (the  "Series  C  Preferred
Stock");   (iv)  pari  passu  with  the   Corporation's   Series  E  Convertible
Non-Exchangeable  Preferred  Stock (the  "Series E Preferred  Stock");  (v) pari
passu with the  Corporation's  Series F Convertible  Non-Exchangeable  Preferred
Stock (the  "Series F Preferred  Stock");  and (vi) pari passu with any class or
series  of  capital  stock of the  Corporation  hereafter  created  specifically

                                      -4-

<PAGE>

ranking on parity  with the Series D  Preferred  Stock  (collectively,  with the
Series  C  Preferred  Stock,  the  Series E  Preferred  Stock  and the  Series F
Preferred Stock, the "Pari Passu Securities").


                                    ARTICLE 4
                                    DIVIDENDS

         SECTION 4.1

                (a) (i)  Subject to Article 6, the Holder  shall be  entitled to
receive, out of funds legally available for the payment of dividends,  dividends
at the rate of 7.0% per annum  (computed  on the basis of a 360-day  year)  (the
"Dividend  Rate")  on the  Stated  Value of each  outstanding  share of Series D
Preferred Stock payable on and as of the most recent Dividend  Payment Date with
respect to each Dividend Period. Dividends on the Series D Preferred Stock shall
be cumulative  from the date of issue or the most recent  Dividend  Payment Date
upon  which  dividends  have been paid on the  Series D  Preferred  Stock by the
Corporation.

                    (ii)  Dividends  on the Series D  Preferred  Stock  shall be
payable in equal  semi-annual  installments  on April 18 and  October 18 of each
year (each, a "Dividend  Payment  Date"),  commencing  April 18, 2000 and ending
October 18,  2005,  to the holders of record of shares of the Series D Preferred
Stock,  as they appear on the stock records of the  Corporation  at the close of
business  on any  record  date,  not  more  than 60  days  or less  than 10 days
preceding  the  payment  dates  thereof,  as  shall  be  fixed  by the  Board of
Directors.  For the purposes hereof,  "Dividend Period," in respect of any share
of Series D Preferred Stock,  shall mean the period commencing on April 18, 2000
and, thereafter, the semiannual period commencing on and including the day after
the immediately  preceding Dividend Payment Date and ending on and including the
immediately  subsequent  Dividend Payment Date. Accrued and unpaid dividends for
any past Dividend Period may be declared and paid at any time, without reference
to any Dividend  Payment Date, to holders of record on such date,  not more than
15 days  preceding  the payment  date  thereof,  as may be fixed by the Board of
Directors.

                    (iii)  Dividends  on the  outstanding  shares  of  Series  D
Preferred  Stock  shall  be  paid  through  the  issuance  of duly  and  validly
authorized  and  issued,  fully  paid  and  non-assessable  shares  of  Series D
Preferred  Stock to be issued at the rate of one (1) share of Series D Preferred
Stock for each $1,000 of dividend due and payable.  No fractional  shares of the
Series D  Preferred  Stock shall be issued as  Dividend  Shares.  Instead of any
fractional  shares of Series D Preferred Stock which would otherwise be issuable
as Dividend  Shares,  the Corporation  shall pay a cash adjustment in respect of
such  fractional  interest  in an amount  equal to $1,000  times the  fractional
interest.

               (b) The Holder  shall not be entitled to any  dividends in excess
of the  cumulative  dividends,  as herein  provided,  on the Series D  Preferred
Stock.  Except as provided in this  Article 4, no  interest,  or sum of money in
lieu of  interest,  shall be  payable  in  respect  of any  dividend  payment or
payments on the Series D Preferred Stock that may be in arrears.

               (c) In  the  event  that,  after  the  first  anniversary  of the
Original  Issue  Date,  the  payment of any  Dividend  Shares  upon the Series D
Preferred  Stock to the Original  Holder  would result in the Original  Holder's
fully-diluted  ownership of Common Stock  (assuming the  conversion  into Common
Stock of all options,  warrants and other securities convertible or exchangeable
into Common Stock  beneficially owned by the Original Holder) to exceed 49.9% of
the then outstanding

                                      -5-

<PAGE>
Common Stock, such excess dividends shall be paid to the Original Holder through
issuance by the  Corporation  of  promissory  notes with an aggregate  principal
amount equal to each dividend  payment  amount then payable  (collectively,  the
"Dividend Notes").  Each Dividend Note shall be issued in substantially the form
attached  as  Exhibit  B to this  Certificate  of  Designations.  It  shall be a
condition to the Corporation's  obligation to issue Dividend Notes in respect of
any such excess  dividends that the Original Holder deliver to the  Corporation,
at least 15 days before the applicable  Dividend Payment Date, a certificate (i)
certifying that the Dividend Shares otherwise  issuable on such Dividend Payment
Date shall cause the Original Holder's beneficial ownership to exceed such 49.9%
amount and (ii)  demonstrating  the  calculation of the principal  amount of the
Dividend Note to be issued in lieu of the applicable excess Dividend Shares.


                                    ARTICLE 5
                             LIQUIDATION PREFERENCE

         SECTION 5.1

               (a) If the Corporation  shall commence a voluntary case under the
Federal  bankruptcy laws or any other  applicable  Federal or State  bankruptcy,
insolvency  or similar law, or consent to the entry of an order for relief in an
involuntary case under any law or to the appointment of a receiver,  liquidator,
assignee,  custodian,  trustee,  sequestrator (or other similar official) of the
Corporation or of any  substantial  part of its property,  or make an assignment
for the benefit of its  creditors,  or admit in writing its inability to pay its
debts  generally  as they  become  due,  or if a decree or order  for  relief in
respect of the  Corporation  shall be entered by a court having  jurisdiction in
the premises in an  involuntary  case under the Federal  bankruptcy  laws or any
other  applicable  Federal  or  state  bankruptcy,  insolvency  or  similar  law
resulting in the  appointment of a receiver,  liquidator,  assignee,  custodian,
trustee,  sequestrator (or other similar  official) of the Corporation or of any
substantial  part of its property,  or ordering the winding up or liquidation of
its affairs,  and any such decree or order shall be unstayed and in effect for a
period of ninety (90)  consecutive  days and, on account of any such event,  the
Corporation  shall liquidate,  dissolve or wind up, or if the Corporation  shall
otherwise  liquidate,  dissolve or wind up (each such event being  considered  a
"Liquidation Event"), no distribution shall be made to the holders of any Junior
Securities of the Corporation upon liquidation, dissolution or winding up unless
prior  thereto,  the  Holders,  subject to Article  5, shall have  received  the
Liquidation  Preference  (as  defined in Article  5.1(b))  with  respect to each
share.  If upon the  occurrence  of a  Liquidation  Event,  the assets and funds
available for distribution among the Holders and holders of shares of Pari Passu
Securities  shall be  insufficient  to permit the payment to such holders of the
                                      -6-

<PAGE>

preferential  amounts payable  thereon,  then the entire assets and funds of the
Corporation  legally  available for distribution to the Series D Preferred Stock
and the Pari Passu Securities shall be distributed  ratably among such shares in
proportion to the ratio that the preferential amounts payable on each such share
bears to the aggregate preferential amounts payable on all such shares.

               (b)  For  purposes  hereof,  the  "Liquidation  Preference"  with
respect to a share of the Series D Preferred Stock shall mean an amount equal to
(i) the Stated Value thereof,  plus (ii) the aggregate of all accrued and unpaid
dividends  on such  share of Series D  Preferred  Stock  until  the most  recent
Dividend  Payment Date;  provided  that, in the event of an actual  liquidation,
dissolution or winding up of the  Corporation,  the amount referred to in clause
(ii) above shall be calculated by including  accrued and unpaid stock  dividends
to the actual date of such  liquidation,  dissolution or winding up, rather than
the applicable Dividend Payment Due Date referred to above.

                                    ARTICLE 6
                     CONVERSION OF SERIES D PREFERRED STOCK

         SECTION 6.1   Conversion.

               (a) Holders of shares of the Series D Preferred  Stock shall have
the right,  exercisable at any time after the second anniversary of the Original
Issue Date and prior to the sixth  anniversary  of the Original  Issue Date,  to
convert all or any such  shares of the Series D Preferred  Stock into the number
of shares of Common  Stock  (calculated  as to each  conversion  to the  nearest
1/100th  of a  share)  determined  by  dividing  (1) the  aggregate  Liquidation
Preference  of the shares of Series D  Preferred  Stock to be  converted  by (2)
$4.86 (the "Conversion Price").  Upon conversion,  no adjustment or payment will
be made for  dividends,  but if any  holder  surrenders  a share of the Series D
Preferred  Stock for  conversion  after the close of business on the record date
for the  payment of a dividend  and prior to the opening of business on the next
Dividend  Payment Date,  then,  notwithstanding  such  conversion,  the dividend
payable on such Dividend  Payment Date will be paid to the registered  holder of
such share on such record date. In such event,  such share, when surrendered for
conversion  during the period  between  the close of  business  on any  dividend
payment  record date and the opening of business on the  corresponding  Dividend
Payment Date,  must be accompanied by payment of an amount equal to the dividend
payable on such Dividend Payment Date on the share so converted.

               (b) Any  holder of a share or shares  of the  Series D  Preferred
Stock  electing  to  convert  such share or shares  thereof  shall  deliver  the
certificate or certificates  therefor to the principal office of the Corporation
or any transfer agent for the Common Stock,  with the form of notice of election
to  convert  attached  as Exhibit C to this  Certificate  of  Designations  (the
"Conversion Notice"), fully completed and duly executed and (if such required by
the Corporation or any conversion agent)  accompanied by instruments of transfer
in form  satisfactory  to the  Corporation  and to any  conversion  agent,  duly
executed  by  the  registered  Holder  of  his  duly  authorized  attorney.  The
conversion  right with  respect to any such shares  shall be deemed to have been
                                      -7-

<PAGE>

exercised at the date upon which the certificates  therefore accompanied by such
duly  executed  notice of election and  instruments  of transfer and such taxes,
stamps,  funds,  or evidence of payment  shall have been so  delivered,  and the
Person or Persons  entitled to receive the shares of the Common  Stock  issuable
upon such  conversion  shall be treated for all purposes as the record Holder or
Holders of such shares of the Common Stock upon said date.

               (c) From and  after  the  delivery  of the  Conversion  Notice in
respect of any conversion of shares of Series D Preferred Stock, all such shares
of Series D Preferred  Stock shall be deemed to have been  converted into shares
of  Common  Stock  as of  the  applicable  Conversion  Date  at  the  applicable
conversion  rate,  all stock  dividends on such shares of the Series D Preferred
Stock shall cease to accrue, and all rights of the Holders thereof as holders of
Series D  Preferred  Stock,  except the right to receive  all accrued and unpaid
stock  dividends to such  Conversion Date at the applicable rate for such shares
of Series D Preferred Stock and the right to receive  certificates  representing
shares of Common Stock issuable upon the  conversion of such shares  (including,
without limitation, with respect to such stock dividends, as applicable),  shall
cease  and  terminate,  such  shares  of  Series D  Preferred  Stock  shall  not
thereafter be transferred  (except with the consent of the Corporation) and such
shares shall not be deemed to be outstanding for any purpose whatsoever.

               (d)  No   fractional   shares  of  the  Common   Stock  or  scrip
representing  fractional shares shall be issued upon conversion of shares of the
Series D Preferred Stock. If more than one share of the Series D Preferred Stock
shall be surrendered  for conversion at one time by the same holder,  the number
of full  shares of the Common  Stock which  shall be  issuable  upon  conversion
thereof shall be computed on the basis of the aggregate  number of shares of the
Series D Preferred Stock so surrendered. Instead of any fractional shares of the
Common Stock which would  otherwise be issuable upon conversion of any shares of
the Series D Preferred  Stock,  the  Corporation  shall pay a cash adjustment in
respect of such  fraction in an amount equal to the same fraction of the Current
Market  Price  for the  Common  Stock  on the last  Trading  Day  preceding  the
applicable date of conversion.

               (e) Each  Conversion  Notice under this Section 6.1 shall request
the  conversion  of at least  500  shares  of  Series D  Preferred  Stock or the
remaining  balance of Series D Preferred  Stock held by the  converting  Holder,
whichever is less.

          SECTION 6.2 Adjustments. The Conversion Price and the number of shares
issuable  upon  conversion  of the  Series D  Preferred  Stock  are  subject  to
adjustment from time to time as follows:

               (a)  Merger,  Sale of  Assets,  Etc.  Notwithstanding  any  other
limitation  whatsoever  contained  herein,  if at any time  while  the  Series D
Preferred  Stock, or any portion  thereof,  is outstanding  there shall be (i) a
reorganization  (other  than  a  combination,   reclassification,   exchange  or
subdivision  of  shares  otherwise  provided  for  herein),  (ii)  a  merger  or
consolidation of the Corporation  with or into another  corporation in which the
Corporation is the surviving entity but the shares of the Corporation's  capital
stock outstanding immediately prior to the merger are converted by virtue of the

                                      -8-

<PAGE>

merger  into  other  property,  whether  in the  form  of  securities,  cash  or
otherwise,  or (iii) a sale or  transfer  of the  Corporation's  properties  and
assets as, or substantially as, an entirety to any other Person,  then as a part
of such reorganization, merger, consolidation, sale or transfer lawful provision
shall be made so that the Holder  shall  thereafter  be entitled to receive upon
conversion of the Series D Preferred Stock,  during the period specified herein,
the number of shares of stock or other  securities  or property of the successor
corporation resulting from such reorganization,  merger, consolidation,  sale or
transfer   that  the  Holder  would  have  been  entitled  to  receive  in  such
reorganization,  consolidation,  merger,  sale  or  transfer  if  the  Series  D
Preferred  Stock had been  converted  immediately  before  such  reorganization,
merger,  consolidation,  sale or transfer,  all subject to further adjustment as
provided in this Section 6.2(a). The foregoing provisions of this Section 6.2(a)
shall similarly apply to successive reclassification,  changes,  consolidations,
mergers,  mandatory  share  exchanges and sales and transfers.  If the per share
consideration  payable to the holder  hereof for shares in  connection  with any
such transaction is in a form other than cash or marketable securities, then the
value of such  consideration  shall be  determined in good faith by the Board of
Directors. In all events, appropriate adjustment (as determined in good faith by
the Board of Directors)  shall be made in the  application  of the provisions of
this Certificate of Designations with respect to the rights and interests of the
Holder after the transaction, to the end that the provisions of this Certificate
of Designations  shall be applicable after that event, as near as reasonably may
be, in relation  to any shares or other  property  deliverable  after that event
upon conversion of the Series D Preferred Stock.

               (b) Reclassification,  Etc. If the Corporation, at any time while
the Series D Preferred Stock, or any portion thereof, remains outstanding, shall
change  any  of  the  securities  as  to  which  conversion  rights  under  this
Certificate  of  Designations  exist  into the  same or a  different  number  of
securities  of any other  class or classes,  the Series D Preferred  Stock shall
thereafter  represent the right to acquire such number and kind of securities as
would  have been  issuable  as the  result of such  change  with  respect to the
securities that were subject to the conversion  rights under this Certificate of
Designations  immediately prior to such reclassification or other change and the
Conversion  Price  therefor  shall be  appropriately  adjusted,  all  subject to
further adjustment as provided in this Certificate of Designations.

               (c)  Split,   Subdivision  or  Combination  of  Shares.   If  the
Corporation  at any time  while the Series D  Preferred  Stock,  or any  portion
thereof, remains outstanding shall split, subdivide or combine the securities as
to which conversion rights under this Certificate of Designations  exist, into a
different  number of securities of the same class, the Conversion Price shall be
proportionately   decreased   in  the  case  of  a  split  or   subdivision   or
proportionately increased in the case of a combination.

               (d)  Adjustments  for Dividends in Stock and Other  Securities or
Property. If while the Series D Preferred Stock, or any portion hereof,  remains
outstanding,  the holders of the securities as to which conversion  rights under
this Certificate of Designations  exist at the time shall have received,  or, on
or after the record date fixed for the determination of eligible stockholders of
the  Corporation,  shall  have  become  entitled  to  receive,  without  payment
therefor,  other or additional stock or other securities or property (other than


                                      -9-

<PAGE>

cash) of the Corporation by way of dividend, then and in each case, the Series D
Preferred  Stock shall  represent  the right to  acquire,  upon  conversion,  in
addition to the number of shares of the security  receivable  upon conversion of
the  Series  D  Preferred   Stock,   and  without   payment  of  any  additional
consideration  therefor,  the amount of such other or additional  stock or other
securities  or  property  (other than cash) of the  Corporation  that the Holder
would  hold on the date of such  conversion  had it been the holder of record of
the security  receivable  upon conversion of the Series D Preferred Stock on the
date  hereof and had  thereafter,  during the period from the date hereof to and
including the date of such  conversion,  retained such shares and/or  additional
stock  available by it as aforesaid  during such  period,  giving  effect to all
adjustments called for during such period by the provisions of this Section 6.2.

               (e) Repurchases or Redemptions of Common Stock or Options. If the
Corporation  at  any  time  while  shares  of  Series  D  Preferred   Stock  are
outstanding,  shall repurchase or redeem any outstanding  shares of Common Stock
or rights,  options or warrants granting the holder thereof the right to acquire
shares of Common Stock (collectively, the "Rights") in a single transaction or a
series of related  transactions  involving an aggregate repurchase or redemption
price in excess of $500,000 at a price (on a per share  basis)  which is greater
than 150% of the Current Market Price as of the day prior to such  repurchase or
redemption,  the Conversion Price shall thereupon be adjusted by multiplying the
Conversion  Price in effect  immediately  prior to the applicable  repurchase or
redemption  by a fraction  (i) the  numerator  of which shall be the  Conversion
Price in effect  immediately prior to such repurchase or redemption and (ii) the
denominator of which shall be the fair market value of the consideration paid by
the  Corporation  for each share of Common  Stock (or each share of Common Stock
issuable upon exercise of the Right(s) subject to such repurchase or redemption)
in such repurchase or redemption.

               (f)  Certificate as to  Adjustments.  Upon the occurrence of each
adjustment or readjustment  pursuant to this Section 6.2, the Corporation at its
expense shall promptly  compute such  adjustment or  readjustment  in accordance
with the terms hereof and furnish to the Holder a certificate setting forth such
adjustment  or  readjustment  and  showing  in detail  the facts upon which such
adjustment or readjustment is based.

               (g) Cumulative Adjustments. No adjustment in the Conversion Price
shall be required until cumulative adjustments result in a concomitant change of
1% or more of the Conversion  Price as in effect prior to the last adjustment of
the Conversion Price; provided, however, that any adjustments which by reason of
this Section 6.2 are not required to be made shall be carried  forward and taken
into account in any subsequent  adjustment.  All calculations under this Section
6.2  shall be made to the  nearest  cent or to the  nearest  one-hundredth  of a
share,  as the case may be. No adjustment to the Conversion  Price shall be made
for cash dividends.

                                      -10-

<PAGE>
                                    ARTICLE 7

                                 EXCHANGE RIGHTS

          SECTION 7.01  Optional  Exchange.  (a) Original  Holders of at least a
majority of the then  outstanding  shares of Series D Preferred Stock shall have
the right, by written notice  delivered to the Corporation in the form of notice
of election to exchange  attached to this Certificate of Designations as Exhibit
D (the "Exchange  Notice"),  fully  completed and duly executed by the requisite
Original Holders,  to require the Corporation to exchange all outstanding shares
of  Series  D  Preferred  Stock  and all  outstanding  Dividend  Notes as of any
Dividend  Payment Date (such date being the "Exchange  Date") for the greater of
(i) 7,224 shares of Newco  Preferred  Stock,  subject to  adjustment  for split,
stock  dividends and similar events  occurring in respect of Newco Capital Stock
after the Original Issue Date, or (ii) a number of shares of Newco Capital Stock
which,  together  with the shares of Newco  Capital Stock issued to the Original
Holder on the  Original  Issue  Date,  equals  fifty  percent  (50%) of the then
outstanding Newco Capital Stock as of the Exchange Date, with such capital stock
to be  delivered  to all Holders on a pro rata basis  based on their  respective
holdings of Series D Preferred  Stock on the Exchange Date. The Exchange  Notice
shall be delivered at least 30 days prior to the Exchange Date.  Upon receipt of
the Exchange  Notice,  the Corporation  shall promptly notify all Holders of its
receipt of thereof and all Holders  will  promptly  deliver the  certificate  or
certificates therefor to the principal office of the Corporation or any transfer
agent for the Common Stock for cancellation.

               (b) From and after  the  delivery  of the  Exchange  Notice,  all
shares of Series D Preferred Stock  (including  Dividend Shares) shall be deemed
to have been  exchanged  for the greater of (i) 7,224 shares of Newco  Preferred
Stock,  subject to adjustment  for split,  stock  dividends  and similar  events
occurring in respect of Newco  Capital  Stock after the Original  Issue Date, or
(ii) a number of shares of Newco Capital  Stock which,  together with the shares
of Newco Capital Stock issued to the Original Holder on the Original Issue Date,
equals fifty percent (50%) of the then outstanding Newco Capital Stock as of the
Exchange  Date,  all stock  dividends  on such  shares of the Series D Preferred
Stock shall cease to accrue,  all interest on the Dividend  Notes shall cease to
accrue,  and all rights of the Holders  thereof as holders of Series D Preferred
Stock and  Dividend  Notes,  except the right to receive  all accrued and unpaid
stock  dividends  on the Series D Preferred  Stock to the  Exchange  Date at the
applicable rate for such shares of such shares of Series D Preferred  Stock, and
the right to receive all accrued and unpaid interest on the Dividend Note to the
Exchange Date at the  applicable  rate for such notes,  and the right to receive
certificates  representing the applicable shares of Newco Capital Stock issuable
in respect of the exchange,  shall cease and terminate,  such shares of Series D
Preferred  Stock and Dividend Notes shall not thereafter be transferred  (except
with the consent of the  Corporation)  and such shares shall not be deemed to be
outstanding for any purpose whatsoever.

               (c) The rights of Holders  under this  Article 7 shall  terminate
and such Holders shall not be entitled to exchange  shares of Series D Preferred
Stock under this Article 7 upon the earlier of (i) the sixth  anniversary of the
Original  Issue Date and (ii) the  delivery to the  Corporation  of a Conversion
Notice pursuant to this Section 6.1.

         SECTION 7.02. Mandatory Exchange. On or before the first anniversary of
the Original Issue Date, the Corporation  shall notify each Holder,  in writing,
(i) that the  issuance of the Series D Preferred  Stock,  and the  issuance  and


                                      -11-

<PAGE>

listing upon the American Stock Exchange  ("AMEX") of the shares of Common Stock
issuable upon conversion of the Series D Preferred  Stock,  has been approved or
ratified by the  stockholders  of the Corporation in accordance with the General
Corporation  Law of the State of Delaware  and the rules and  regulation  of the
AMEX  or  (ii)  that  such  approval  or  ratification  is not  required  by the
applicable rules of the AMEX. In the event that the Corporation fails to provide
such written  notice on or before the first  anniversary  of the Original  Issue
Date,  (A) all  outstanding  shares of Series D Preferred  Stock shall be deemed
exchanged for promissory note(s) in substantially the form of Exhibit A attached
to this Certificate of Designations  (the "Exchange  Notes"),  in the respective
principal amounts equal to the aggregate Liquidation Preference of all shares of
Series D Preferred Stock held by each  respective  Holder as of the date of such
exchange  and (B) from and after the first  anniversary  of the  Original  Issue
Date, all shares of Series D Preferred Stock  (including  Dividend Shares) shall
be deemed to have been exchanged for Exchange Notes, all dividends on the Series
D Preferred  Stock shall cease to accrue,  and all rights of Holders  thereof as
holders of Series D Preferred  Stock shall cease and terminate and all shares of
Series D  Preferred  Stock  shall  not be  deemed  outstanding  for any  purpose
whatsoever,  except the right to receive the Exchange  Notes issuable to them as
determined above.


                                    ARTICLE 8
                                  VOTING RIGHTS

         The  holders  of the  Series D  Preferred  Stock  shall  have no voting
rights, except as otherwise provided by the General Corporation Law of the State
of Delaware ("DGCL") and in this Article 8, and in Article 9 below.

         The  Corporation  shall provide each Holder of Series D Preferred Stock
with prior  notification  of any meeting of the  shareholders of the Corporation
(and copies of proxy materials and other information sent to  shareholders).  In
the event of any taking by the Corporation of a record of its  shareholders  for
the purpose of determining  shareholders  who are entitled to receive payment of
any  dividend or other  distribution,  any right to subscribe  for,  purchase or
otherwise   acquire   (including   by   way   of   merger,    consolidation   or
recapitalization) any share of any class or any other securities or property, or
to receive any other right, or for the purpose of determining  shareholders  who
are entitled to vote in connection with any proposed liquidation, dissolution or
winding  up of the  Corporation,  the  Corporation  shall  mail a notice to each
Holder,  at least thirty (30) days prior to the  consummation of the transaction
or event,  whichever is earlier),  of the date on which any such action is to be
taken for the purpose of such dividend,  distribution, right or other event, and
a  brief  statement  regarding  the  amount  and  character  of  such  dividend,
distribution, right or other event to the extent known at such time.

         To the extent that under the DGCL the vote of the Holders of the Series
D Preferred  Stock,  voting  separately as a class or series as  applicable,  is
required to authorize a given action of the Corporation, the affirmative vote or
consent  of the  Holders  of at least a  majority  of the shares of the Series D
Preferred Stock  represented at a duly held meeting at which a quorum is present
or by written  consent of a majority of the shares of Series D  Preferred  Stock

                                      -12-

<PAGE>

(except as  otherwise  may be  required  under the DGCL)  shall  constitute  the
approval of such action by the class.  To the extent that under the DGCL Holders
of the Series D Preferred Stock are entitled to vote on a matter with Holders of
Common  Stock,  voting  together as one class,  each share of Series D Preferred
Stock  shall be  entitled  to a number of votes equal to the number of shares of
Common  Stock into which such shares are  convertible  as of the record date for
the taking of such vote of shareholders. Holders of the Series D Preferred Stock
shall be entitled to notice of all shareholder meetings or written consents (and
copies of proxy  materials  and other  information  sent to  shareholders)  with
respect to which they would be entitled as of right under the DGCL, which notice
would be provided pursuant to the Corporation's bylaws and the DGCL.

                                    ARTICLE 9
                              PROTECTIVE PROVISIONS

         So long as shares  of Series D  Preferred  Stock are  outstanding,  the
Corporation  shall not, without first obtaining the approval (by vote or written
consent,  as  provided by the DGCL) of the Holders of at least a majority of the
then outstanding shares of Series D Preferred Stock:

               (a)  create  any new class or series of  capital  stock  having a
preference superior to the Series D Preferred Stock as to distribution of assets
upon  liquidation,  dissolution  or  winding  up  of  the  Corporation  ("Senior
Securities")  or alter or change the rights,  preferences  or  privileges of any
Senior Securities so as to affect adversely the Series D Preferred Stock; or

               (b) amend or alter whether by merger, consolidation or otherwise,
any of the  provisions  of the  Certificate  of  Incorporation  (including  this
Certificate  of  Designations)  that  would  change the  preferences,  rights or
privileges  with  respect  to the Series D  Preferred  Stock so as to affect the
Series D Preferred Stock adversely.

         In the event  holders  of at least a majority  of the then  outstanding
shares of Series D Preferred  Stock agree to allow the  Corporation  to amend or
alter the preferences,  rights or privileges of the shares of Series D Preferred
Stock,  pursuant to subsection (b) above, so as to affect adversely the Series D
Preferred  Stock,  then the  Corporation  will deliver  notice of such  approved
change to the Holders of the Series D Preferred Stock that did not agree to such
amendment or change (the "Dissenting  Holders") and the Dissenting Holders shall
have the right for a period of thirty  (30) days to convert  pursuant to Section
6.1 of this  Certificate of  Designations as they exist prior to such alteration
or  continue  to hold their  shares of Series D Preferred  Stock.  The  Holders'
rights under this  Article 9 shall  terminate  on the sixth  anniversary  of the
Original Issue Date.

                                      -13-
<PAGE>
                                   ARTICLE 10
                                  MISCELLANEOUS

         SECTION 10.1 Loss, Theft, Destruction of Series D Preferred Stock. Upon
receipt  of  evidence  satisfactory  to  the  Corporation  of the  loss,  theft,
destruction or mutilation of shares of Series D Preferred Stock and, in the case
of any such loss,  theft or  destruction,  upon receipt of indemnity or security
reasonably  satisfactory  to the  Corporation,  or,  in  the  case  of any  such
mutilation, upon surrender and cancellation of the Series D Preferred Stock, the
Corporation  shall  make,  issue  and  deliver,  in lieu of such  lost,  stolen,
destroyed or mutilated  shares of Series D Preferred Stock, new shares of Series
D Preferred Stock of like date and tenor.

         SECTION 10.2 Who Deemed  Absolute  Owner.  The Corporation may deem the
Person in whose name the Series D Preferred  Stock shall be registered  upon the
registry books of the Corporation to be, and may treat it as, the absolute owner
of the  Series D  Preferred  Stock  for the  purpose  of  receiving  payment  of
dividends on the Series D Preferred  Stock,  for the  conversion of the Series D
Preferred  Stock and for all other purposes,  and the  Corporation  shall not be
affected by any notice to the contrary.  All such  payments and such  conversion
shall be valid and effectual to satisfy and  discharge  the  liability  upon the
Series  D  Preferred  Stock  to the  extent  of the  sum or  sums so paid or the
conversion so made.

         SECTION 10.3  Register.  The  Corporation  shall keep at its  principal
office a register in which the Corporation shall provide for the registration of
the Series D Preferred Stock.  Upon any transfer of the Series D Preferred Stock
in accordance with the provisions  hereof,  the Corporation  shall register such
transfer on the Series D Preferred Stock register.

         SECTION 10.4 Withholding. To the extent required by applicable law, the
Corporation  may  withhold  amounts  for or on account  of any taxes  imposed or
levied by or on behalf of any  taxing  authority  in the  United  States  having
jurisdiction  over the Corporation from any payments made pursuant to the Series
D Preferred Stock.

         SECTION  10.5  Headings.  The  headings of the Articles and Sections of
this  Certificate of Designations  are inserted for convenience  only and do not
constitute a part of this Certificate of Designations.  IN WITNESS WHEREOF,  the
Corporation has caused this Certificate of Designations,  Preferences and Rights
to be signed by Loren G. Peterson,  its President and Chief  Executive  Officer,
and attested by Scott A. Hoffmann,  its Secretary,  on this 18th day of October,
1999.

                                      SHEFFIELD PHARMACEUTICALS, INC.



                                      By:/s/ Loren G. Peterson
                                         ---------------------------------------
                                           Loren G. Peterson
                                           President and Chief Executive Officer


Attested:


By:  /s/ Scott A. Hoffman
     -----------------------
     Scott A. Hoffmann
     Secretary

                                      -15-
<PAGE>
                                                                       Exhibit A

                              FORM OF EXCHANGE NOTE

                         SHEFFIELD PHARMACEUTICALS, INC.



U.S. $___________                                             ____________, 20__


The  undersigned,  Sheffield  Pharmaceuticals,   Inc.,  a  Delaware  corporation
("Sheffield"),  for  value  received,  hereby  promises  to pay to the  order of
____________________________  (the  "Investor")  or its  permitted  assigns (the
"Holder"),  at such place as may be designated  by the Holder to Sheffield,  the
sum of  ______________________  dollars  ($___________),  plus  interest  on the
unpaid  principal  balance at the rate specified  below,  in accordance with the
provisions set forth herein. During the term of this Note, interest shall accrue
at the rate of 7.0% per  annum  (calculated  on the  basis of a year of 360 days
comprised of 12 30-day months).  Accrued interest shall be payable (i) quarterly
in arrears on the first day of January, April, July and October of each year and
(ii) in-kind through the issuance of additional notes in like tenor to this Note
(the "Interest Notes").  The full principal amount of this Note and all Interest
Notes,  including  any  accrued  interest  thereon,  shall be due and payable on
October 18, 2005 (the "Maturity Date").  This Note is originally being issued in
exchange for shares of Series D Preferred  Stock,  par value $.01 per share,  of
Sheffield (the "Series D Preferred  Stock"),  the rights of which are designated
in the  Certificate of Designations of the Series D Preferred Stock of Sheffield
(the  "Certificate  of  Designations"),  and  pursuant  to a certain  Securities
Purchase Agreement,  dated October 18, 1999 (the "Original Issue Date"), between
Sheffield and Elan International Services, Ltd. (the "Purchase Agreement").  All
Notes issued in exchange for shares of Series D Preferred  Stock,  including the
Interest  Notes,  or upon  transfer or  exchange of other Notes are  referred to
herein as the "Notes."

All capitalized  terms used in this Note and not otherwise  defined herein shall
have the meaning assigned to such terms in the Certificate of Designations.

The  following is a statement of the rights of the Holder and the  conditions to
which this Note is subject, and to which the Holder hereof, by the acceptance of
this Note, agrees:

         1.    Mandatory Exchange.

               (a) Upon the  delivery  by holders of at least a majority  of the
then  outstanding  principal  balance of Notes of written  notice  delivered  to
Sheffield  in the form of notice of election to exchange  attached as Annex A to
this Note (the "Exchange Notice"),  the Holder of this Note shall be required to
surrender  this Note in  exchange  for a pro rata  portion of the greater of (i)
7,224 shares of Newco Preferred  Stock,  subject to adjustment for split,  stock
dividends and similar events  occurring after the Original Issue Date, or (ii) a
number of shares of Newco Capital Stock which,

<PAGE>

together with the shares of Newco Capital Stock issued to the Original Holder on
the Original  Issue Date,  equals fifty  percent  (50%) of the then  outstanding
Newco Capital Stock as of the Exchange Date.

               (b) From and after the delivery of the Exchange Notice, this Note
shall be deemed to have been  exchanged for a pro rata portion of the greater of
(i) 7,224 shares of Newco  Preferred  Stock,  subject to  adjustment  for split,
stock  dividends and similar events  occurring after the Original Issue Date, or
(ii) a number of shares of Newco Capital  Stock which,  together with the shares
of Newco Capital Stock issued to the Original Holder on the Original Issue Date,
equals fifty percent (50%) of the then outstanding Newco Capital Stock as of the
Exchange Date, all interest on the Note shall cease to accrue, and all rights of
the Holder as a holder of the Note,  except the right to receive all accrued and
unpaid  interest to such Exchange Date at the applicable  rate for such Note and
the right to receive  certificates  representing  shares of Newco  Capital Stock
issuable  upon the exchange of the Note  (including,  without  limitation,  with
respect to such Notes issued as interest  paid in kind  stock),  shall cease and
terminate, the Note shall not thereafter be transferred (except with the consent
of Sheffield) and the Note shall not be deemed to be outstanding for any purpose
whatsoever.

         2. Exchange or Replacement of Note.

               (a)  The  Holder,  at  its  option,  may  in  person  or by  duly
authorized attorney surrender this Note for exchange, at the office or agency of
Sheffield  and  receive in  exchange  therefor a new Note in the same  aggregate
principal amount as the unpaid principal amount of the Note so surrendered, each
such new Note to be dated as of the date to which  interest has been paid on the
Note so surrendered and payable to the Holder or its assignee, as the Holder may
designate in writing  (subject to the restrictions on transfer set forth in this
Note and in the Purchase Agreement).

               (b) Upon receipt by Sheffield of evidence  satisfactory  to it of
the loss, theft, destruction,  or mutilation of this Note, and (in case of loss,
theft or  destruction)  of  indemnity  reasonably  satisfactory  to it, and upon
reimbursement to Sheffield of all reasonable expenses  incidental  thereto,  and
upon surrender and cancellation of this Note, if mutilated, Sheffield shall make
and  deliver a new Note of like  tenor in lieu of this  Note.  Any Note made and
delivered in accordance with this paragraph shall be dated the date hereof.

          3. Amendments. This Note may not be amended, modified or waived in any
respect unless set forth in writing and signed by the Holder, in the case of any
change hereto, including any change in the amount or timing of any payment to be
made hereunder or any adverse change in conversion  rights  hereunder.  Any such
amendment,  modification  or waiver shall be binding upon each future  holder of
this Note.

          4. Costs and Expenses.  Sheffield  agrees to pay all reasonable  costs
and expenses,  including  reasonable  attorneys' fees, incurred by the Holder in
collecting or enforcing this Note.

          5. No Waivers. No delay by the Holder in exercising any power or right
hereunder shall operate as a waiver of any power or right,  nor shall any single
or partial  exercise of any power or right  preclude  other or further  exercise
thereof, or the exercise of any other power or right hereunder or otherwise.


<PAGE>
          6. Events of Default

          The  occurrence  of any of the  following  events shall  constitute an
event of default (an "Event of Default"):

               (a) A default  in the  payment  of the  principal  amount of this
Note, when and as the same shall become due and payable;

               (b) a default in the payment of any  accrued and unpaid  interest
on this Note, when and as the same shall become due and payable;

               (c) a  default  in the  performance,  or a  breach  of any  other
covenant  or  agreement  of  Sheffield  in this  Note on any  other  Transaction
Document (as defined in the Purchase Agreement), and continuance of such default
or breach for a period of 10 days after the Holder has notified Sheffield of its
occurrence;

               (d)  any  representation,  warranty,  or  certification  made  by
Sheffield pursuant to this Note or any other Transaction Document shall prove to
have been false or misleading as of the date made in any material respect; or

               (e) (i)  the  entry  of a  decree  or  order  by a  court  having
jurisdiction adjudging Sheffield bankrupt or insolvent,  or approving a petition
seeking reorganization,  arrangement, adjustment or composition of or in respect
of Sheffield,  and the  continuance  of any such decree or order unstayed and in
effect  for a  period  of 60 days;  (ii)  the  commencement  by  Sheffield  of a
voluntary  case  under  United  States  bankruptcy  law,  as  now  or  hereafter
constituted,  or the consent by Sheffield to the  institution  of  bankruptcy or
insolvency  proceedings  against it; (iii) the filing by Sheffield of a petition
or answer or  consent  seeking  reorganization  or relief  under  United  States
bankruptcy  law;  (iv) the  appointment  of a  receiver,  liquidator,  assignee,
trustee,  sequestrator,  or similar  official of Sheffield or of any substantial
part of its property which is not  discharged  within 30 days; (v) the making by
Sheffield of an assignment for the benefit of creditors,  or the admission by it
in writing of its  inability  to pay its debts  generally as they become due, or
the taking of corporate action by Sheffield in furtherance of any such action.

         7. Remedies in the Event of Default

               (a) In the  case  of any  Event  of  Default  by  Sheffield,  the
principal  amount of this Note and accrued and unpaid interest thereon shall, in
addition  to all other  rights and  remedies of the Holder  hereunder  and under
applicable law, be and become immediately due and payable.

               (b) Sheffield  hereby waives grace,  demand and  presentment  for
payment, notice of nonpayment,  protest and notice of protest, diligence, filing
suit,  and all  other  notice  and  promises  to pay the  Holder  its  costs  of
collection of all amounts due hereunder, including reasonable attorneys' fees.


<PAGE>
               (c) Upon the occurrence and during the  continuation of any Event
of Default or breach of this Note by Sheffield  this Note shall bear interest at
the interest rate  otherwise in effect  hereunder  plus 3% per annum (but in any
event not in excess of the maximum  rate of  interest  permitted  by  applicable
law).

         8. Seniority

               This Note shall constitute senior indebtedness of Sheffield,  and
Sheffield shall not incur any  indebtedness  for money borrowed which shall rank
senior  to, or pari  passu  with,  this Note  without  the prior  consent of the
holders of a majority in principal amount of the Notes;  provided,  that nothing
contained  herein shall be construed as to prevent  Sheffield from incurring and
paying  obligations in the ordinary course of business,  in accordance with past
practice.

         9. Miscellaneous

               (a) The Investor may assign this Note to its  affiliates (as such
term is defined in the Securities  Exchange Act of 1934, as amended).  This Note
and all of the provisions  hereof shall be binding upon and inure to the benefit
of the parties hereto and their  respective  successors and assigns,  subject to
compliance by such assignee with the representations and warranties contained in
Section 3(a) of the Purchase Agreement.

               (b) All notices, demands and requests of any kind to be delivered
to the other party in connection with this Note shall be in writing and shall be
deemed  to  have  been  duly  given  if  personally  delivered  or  if  sent  by
nationally-recognized  overnight courier or by registered or certified  airmail,
return receipt requested and postage prepaid, addressed as follows:

               to Sheffield:

                   Sheffield Pharmaceuticals, Inc.
                   South Winton Court
                   3136 Winton Road South
                   Suite 306
                   Rochester, NY  14623
                   Attn: Chairman

               and

                   Sheffield Pharmaceuticals, Inc.
                   425 South Woodsmill Road
                   St. Louis, Missouri 63017-3441
                   Attention: Chief Executive Officer
<PAGE>

               with a copy to:

                   Olshan Grundman Frome, Rosenzweig & Wolosky LLP
                   505 Park Avenue
                   New York, NY  10022
                   Attention: Daniel J. Gallagher

               to Holder:

                   at the address provided to Sheffield by the Holder.

Each party, by written notice given to the other in accordance with this Section
may change the address to which notices, other communication or documents are to
be sent to such party. All notices,  other  communications or documents shall be
deemed to have been duly given when received.  Any such notice or  communication
shall be deemed to have been received (i) in the case of personal  delivery,  on
the date of such delivery, (ii) in the case of  nationally-recognized  overnight
courier,  on the second  business  day after the date when sent and (iii) in the
case of mailing, on the fifth business day following that day on which the piece
of mail containing such  communication is posted.  Notice hereunder may be given
on behalf of the parties by their respective attorneys.

               (c) This Note shall be governed by and  construed  in  accordance
with the laws of the state of New York,  without  reference to the principles of
conflicts of laws thereof.




<PAGE>
IN WITNESS  WHEREOF,  Sheffield has caused this Note to be issued as of the date
first set forth hereinabove.

                                            SHEFFIELD PHARMACEUTICALS, INC.



                                            By:________________________________
                                               Name:
                                               Title:





<PAGE>
                                                                         Annex A
                                                                to Exchange Note

                             FORM OF EXCHANGE NOTICE


TO:    Sheffield Pharmaceuticals, Inc.
       Attention: Chief Financial Officer


               The undersigned  owner(s) of Exchange Notes  ("Notes")  issued by
Sheffield   Pharmaceuticals,   Inc.  (the   "Corporation")   hereby  irrevocably
exercise(s)  its  option to cause  the  Corporation  to  exchange  $________  of
outstanding principal balance of the Notes for a pro rata portion of the greater
of (i) 7,224 shares of preferred  stock, par value $1.00 per share, of Sheffield
Newco,  Limited,  a Bermuda  corporation  ("Newco"),  subject to adjustment  for
split,  stock  dividends and similar events  occurring  after the Original Issue
Date, or (ii) a number of shares of Newco Capital Stock which, together with the
shares of Newco  Capital  Stock  issued to the  Original  Holder on the Original
Issue Date,  equals fifty  percent (50%) of the then  outstanding  Newco Capital
Stock  as of the  Exchange  Date,  in  accordance  with  the  terms  of the Note
originally  issued in  exchange  for shares of Series D  Cumulative  Convertible
Exchangeable  Non-Redeemable  Preferred  Stock, par value $.01 per share of, the
Corporation  issued  pursuant to the Certificate of Designations of the Series D
Preferred Stock. The undersigned  hereby instructs the Corporation to advise all
other holders of Notes,  if any, of this exercise by the  undersigned  owner(s).
The undersigned  directs that the Newco Capital Stock issuable and  certificates
therefor deliverable to the undersigned upon such exchange be issued in the name
of and delivered to the  undersigned  unless a different name has been indicated
below.  All  capitalized  terms used and not defined  herein have the respective
meanings assigned to them in the Notes.

Dated:
                                              --------------------------------


                                              by:_____________________________
                                                 Name:
                                                 Title:

Please print name and address
(including zip code number) :

- --------------------------
- --------------------------
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<PAGE>
                                                                       Exhibit B

                              FORM OF DIVIDEND NOTE

                         SHEFFIELD PHARMACEUTICALS, INC.



U.S. $___________                                         ____________, 20__


The  undersigned,  Sheffield  Pharmaceuticals,   Inc.,  a  Delaware  corporation
("Sheffield"),  for  value  received,  hereby  promises  to pay to the  order of
____________________________  (the  "Investor")  or its  permitted  assigns (the
"Holder"),  at such place as may be designated  by the Holder to Sheffield,  the
sum of  ______________________  dollars  ($___________),  plus  interest  on the
unpaid  principal  balance at the rate specified  below,  in accordance with the
provisions set forth herein. During the term of this Note, interest shall accrue
at the rate of 7.0% per  annum  (calculated  on the  basis of a year of 360 days
comprised of 12 30-day months).  Accrued interest shall be payable (i) quarterly
in arrears on the first day of January, April, July and October of each year and
(ii) in-kind through the issuance of additional notes in like tenor to this Note
(the "Interest Notes").  The full principal amount of this Note and all Interest
Notes,  including  any  accrued  interest  thereon,  shall be due and payable on
October 18, 2005 (the "Maturity Date").  This Note is originally being issued as
payment of dividends due on shares of Series D Preferred  Stock,  par value $.01
per share,  of Sheffield (the "Series D Preferred  Stock"),  the rights of which
are  designated in the  Certificate  of  Designations  of the Series D Preferred
Stock of  Sheffield  (the  "Certificate  of  Designations"),  and  pursuant to a
certain  Securities  Purchase  Agreement,  dated October 18, 1999 (the "Original
Issue Date"),  between  Sheffield  and Elan  International  Services,  Ltd. (the
"Purchase Agreement"). All Notes issued as payment of dividends due on shares of
Series D Preferred  Stock,  including  the Interest  Notes,  or upon transfer or
exchange of other Notes are referred to herein as the "Notes."

All capitalized  terms used in this Note and not otherwise  defined herein shall
have the meaning assigned to such terms in the Certificate of Designations.

The  following is a statement of the rights of the Holder and the  conditions to
which this Note is subject, and to which the Holder hereof, by the acceptance of
this Note, agrees:

         1. Mandatory Exchange.


<PAGE>

               (a) Upon the  delivery  by holders of at least a majority  of the
then outstanding  shares of Series D Preferred Stock of written notice delivered
to  Sheffield  in the form of notice of  election  to  exchange  attached to the
Certificate of Designations as Exhibit D (the "Exchange Notice"),  the Holder of
this Note shall be required to  surrender  this Note in exchange  for a pro rata
portion of the greater of (i) 7,224 shares of Newco Preferred Stock,  subject to
adjustment for split,  stock  dividends and similar events  occurring  after the
Original  Issue Date,  or (ii) a number of shares of Newco  Capital Stock which,
together with the shares of Newco Capital Stock issued to the Original Holder on
the Original  Issue Date,  equals fifty  percent  (50%) of the then  outstanding
Newco Capital Stock as of the Exchange Date.

               (b) From and after the delivery of the Exchange Notice, this Note
shall be deemed to have been  exchanged for a pro rata portion of the greater of
(i) 7,224 shares of Newco  Preferred  Stock,  subject to adjustment for a split,
stock  dividends and similar events  occurring after the Original Issue Date, or
(ii) a number of shares of Newco Capital  Stock which,  together with the shares
of Newco Capital Stock issued to the Original Holder on the Original Issue Date,
equals fifty percent (50%) of the then outstanding Newco Capital Stock as of the
Exchange Date, all interest on the Note shall cease to accrue, and all rights of
the Holder as a holder of the Note,  except the right to receive all accrued and
unpaid  interest to such Exchange Date at the applicable  rate for such Note and
the right to receive  certificates  representing  shares of Newco  Capital Stock
issuable  upon the exchange of the Note  (including,  without  limitation,  with
respect to such Notes issued as interest  paid in kind  stock),  shall cease and
terminate, the Note shall not thereafter be transferred (except with the consent
of Sheffield) and the Note shall not be deemed to be outstanding for any purpose
whatsoever.

         2. Exchange or Replacement of Note.

               (a)  The  Holder,  at  its  option,  may  in  person  or by  duly
authorized attorney surrender this Note for exchange, at the office or agency of
Sheffield  and  receive in  exchange  therefor a new Note in the same  aggregate
principal amount as the unpaid principal amount of the Note so surrendered, each
such new Note to be dated as of the date to which  interest has been paid on the
Note so surrendered and payable to the Holder or its assignee, as the Holder may
designate in writing  (subject to the restrictions on transfer set forth in this
Note and in the Purchase Agreement).

               (b) Upon receipt by Sheffield of evidence  satisfactory  to it of
the loss, theft, destruction,  or mutilation of this Note, and (in case of loss,
theft or  destruction)  of  indemnity  reasonably  satisfactory  to it, and upon
reimbursement to Sheffield of all reasonable expenses  incidental  thereto,  and
upon surrender and cancellation of this Note, if mutilated, Sheffield shall make
and  deliver a new Note of like  tenor in lieu of this  Note.  Any Note made and
delivered in accordance with this paragraph shall be dated the date hereof.

         3. Amendments.  This Note may not be amended, modified or waived in any
respect unless set forth in writing and signed by the Holder, in the case of any
change hereto, including any change in the amount or timing of any payment to be
made hereunder or any adverse change in conversion  rights  hereunder.  Any such
amendment,  modification  or waiver shall be binding upon each future  holder of
this Note.

<PAGE>

         4. Costs and Expenses. Sheffield agrees to pay all reasonable costs and
expenses,  including  reasonable  attorneys'  fees,  incurred  by the  Holder in
collecting or enforcing this Note.

         5. No Waivers.  No delay by the Holder in exercising any power or right
hereunder shall operate as a waiver of any power or right,  nor shall any single
or partial  exercise of any power or right  preclude  other or further  exercise
thereof, or the exercise of any other power or right hereunder or otherwise.

         6. Events of Default

         The occurrence of any of the following events shall constitute an event
of default (an "Event of Default"):

               (a) A default  in the  payment  of the  principal  amount of this
Note, when and as the same shall become due and payable;

               (b) a default in the payment of any  accrued and unpaid  interest
on this Note, when and as the same shall become due and payable;

               (c) a  default  in the  performance,  or a  breach  of any  other
covenant  or  agreement  of  Sheffield  in this  Note on any  other  Transaction
Document (as defined in the Purchase Agreement), and continuance of such default
or breach for a period of 10 days after the Holder has notified Sheffield of its
occurrence;

               (d)  any  representation,  warranty,  or  certification  made  by
Sheffield pursuant to this Note or any other Transaction Document shall prove to
have been false or misleading as of the date made in any material respect; or

               (e) (i)  the  entry  of a  decree  or  order  by a  court  having
jurisdiction adjudging Sheffield bankrupt or insolvent,  or approving a petition
seeking reorganization,  arrangement, adjustment or composition of or in respect
of Sheffield,  and the  continuance  of any such decree or order unstayed and in
effect  for a  period  of 60 days;  (ii)  the  commencement  by  Sheffield  of a
voluntary  case  under  United  States  bankruptcy  law,  as  now  or  hereafter
constituted,  or the consent by Sheffield to the  institution  of  bankruptcy or
insolvency  proceedings  against it; (iii) the filing by Sheffield of a petition
or answer or  consent  seeking  reorganization  or relief  under  United  States
bankruptcy  law;  (iv) the  appointment  of a  receiver,  liquidator,  assignee,
trustee,  sequestrator,  or similar  official of Sheffield or of any substantial
part of its property which is not  discharged  within 30 days; or (v) the making
by Sheffield of an assignment for the benefit of creditors,  or the admission by
it in writing of its inability to pay its debts generally as they become due, or
the taking of corporate action by Sheffield in furtherance of any such action;



<PAGE>

         7. Remedies in the Event of Default

               (a) In the  case  of any  Event  of  Default  by  Sheffield,  the
principal  amount of this Note and accrued and unpaid interest thereon shall, in
addition  to all other  rights and  remedies of the Holder  hereunder  and under
applicable law, be and become immediately due and payable.  (b) Sheffield hereby
waives grace, demand and presentment for payment, notice of nonpayment,  protest
and notice of protest, diligence, filing suit, and all other notice and promises
to pay the  Holder  its  costs  of  collection  of all  amounts  due  hereunder,
including reasonable attorneys' fees.

               (c) Upon the occurrence and during the  continuation of any Event
of Default or breach of this Note by Sheffield  this Note shall bear interest at
the interest rate  otherwise in effect  hereunder  plus 3% per annum (but in any
event not in excess of the maximum  rate of  interest  permitted  by  applicable
law).

         8. Seniority

               This Note shall constitute senior indebtedness of Sheffield,  and
Sheffield shall not incur any  indebtedness  for money borrowed which shall rank
senior  to, or pari  passu  with,  this Note  without  the prior  consent of the
holders of a majority in principal amount of the Notes;  provided,  that nothing
contained  herein shall be construed as to prevent  Sheffield from incurring and
paying  obligations in the ordinary course of business,  in accordance with past
practice.

         9. Miscellaneous

               (a) The Investor may assign this Note to its  affiliates (as such
term is defined in the Securities  Exchange Act of 1934, as amended).  This Note
and all of the provisions  hereof shall be binding upon and inure to the benefit
of the parties hereto and their  respective  successors and assigns,  subject to
compliance by such assignee with the representations and warranties contained in
Section 3(e) of the Purchase Agreement.

               (b) All notices, demands and requests of any kind to be delivered
to the other party in connection with this Note shall be in writing and shall be
deemed  to  have  been  duly  given  if  personally  delivered  or  if  sent  by
nationally-recognized  overnight courier or by registered or certified  airmail,
return receipt requested and postage prepaid, addressed as follows:

                     to Sheffield:

                            Sheffield Pharmaceuticals, Inc.
                            South Winton Court
                            3136 Winton Road South
                            Suite 306
                            Rochester, NY  14623
                            Attn: Chairman

                     and
<PAGE>

                            Sheffield Pharmaceuticals, Inc.
                            425 South Woodsmill Road
                            St. Louis, Missouri 63017-3441
                            Attention: Chief Executive Officer

                     with a copy to:

                            Olshan Grundman Frome, Rosenzweig & Wolosky LLP
                            505 Park Avenue
                            New York, NY  10022
                            Attention: Daniel J. Gallagher

                     to Holder:

                            at the address provided to Sheffield by the Holder.

Each party, by written notice given to the other in accordance with this Section
may change the address to which notices, other communication or documents are to
be sent to such party. All notices,  other  communications or documents shall be
deemed to have been duly given when received.  Any such notice or  communication
shall be deemed to have been received (i) in the case of personal  delivery,  on
the date of such delivery, (ii) in the case of  nationally-recognized  overnight
courier,  on the second  business  day after the date when sent and (iii) in the
case of mailing, on the fifth business day following that day on which the piece
of mail containing such  communication is posted.  Notice hereunder may be given
on behalf of the parties by their respective attorneys.

               (c) This Note shall be governed by and  construed  in  accordance
with the laws of the state of New York,  without  reference to the principles of
conflicts of laws thereof.

<PAGE>

IN WITNESS  WHEREOF,  Sheffield has caused this Note to be issued as of the date
first set forth hereinabove.

                                          SHEFFIELD PHARMACEUTICALS, INC.



                                          By:________________________________
                                             Name:
                                             Title:



<PAGE>
                                                                       Exhibit C

                            FORM OF CONVERSION NOTICE


TO:   Sheffield Pharmaceuticals, Inc.
      Attention: Chief Financial Officer


               The   undersigned   owner  of  shares  of  Series  D   Cumulative
Convertible  Exchangeable Preferred Stock, par value $.01 per share (the "Series
D  Preferred   Stock")   issued  by   Sheffield   Pharmaceuticals,   Inc.   (the
"Corporation")  hereby  irrevocably  exercises its option to convert  __________
shares of the Series D Preferred Stock into shares of the common stock, $.01 par
value, of the Corporation  ("Common Stock"), in accordance with the terms of the
Certificate of  Designations  of the Series D Preferred  Stock.  The undersigned
hereby instructs the Corporation to convert the number of shares of the Series D
Preferred  Stock  specified above into shares of Common Stock in accordance with
the provisions of Article 6 of such Certificate of Designations. The undersigned
directs that the Common Stock  issuable and  certificates  therefor  deliverable
upon conversion, the Series D Preferred Stock recertificated,  if any, not being
surrendered  for  conversion  hereby,  together  with any check in  payment  for
fractional  Common  Stock,  be  issued  in  the  name  of and  delivered  to the
undersigned  unless a different name has been indicated  below.  All capitalized
terms used and not defined herein have the respective  meanings assigned to them
in such Certificate of Designations.


Dated:_______________

                                               --------------------------------

                                               by:_____________________________
                                                  Name:
                                                  Title:


              Fill in for registration of Series D Preferred Stock:

Please print name and address
(including zip code number) :


- --------------------------
- --------------------------
- --------------------------
- --------------------------

<PAGE>
                                                                       Exhibit D


                             FORM OF EXCHANGE NOTICE


TO:   Sheffield Pharmaceuticals, Inc.
      Attention: Chief Financial Officer


               The  undersigned  owner(s)  of  shares  of  Series  D  Cumulative
Convertible  Exchangeable Preferred Stock, par value $.01 per share (the "Series
D  Preferred   Stock")   issued  by   Sheffield   Pharmaceuticals,   Inc.   (the
"Corporation")   hereby   irrevocably   exercise(s)  its  option  to  cause  the
Corporation to exchange  ________  shares of Series D Preferred  Stock for a pro
rata portion of the greater of (i) 7,224 shares of  preferred  stock,  par value
$1.00 per share, of Sheffield Newco,  Limited, a Bermuda corporation  ("Newco"),
subject to adjustment for split,  stock  dividends and similar events  occurring
after the Original Issue Date, or (ii) a number of shares of Newco Capital Stock
which,  together  with the shares of Newco  Capital Stock issued to the Original
Holder on the  Original  Issue  Date,  equals  fifty  percent  (50%) of the then
outstanding  Newco Capital Stock as of the Exchange Date, in accordance with the
terms of the Certificate of Designations  of the Series D Preferred  Stock.  The
undersigned  hereby  instructs  the  Corporation  to advise all other holders of
Series D Preferred Stock, if any, of this exercise by the undersigned  owner(s).
The undersigned  directs that the Newco Capital Stock issuable and  certificates
therefor deliverable to the undersigned upon such exchange be issued in the name
of and delivered to the  undersigned  unless a different name has been indicated
below.  All  capitalized  terms used and not defined  herein have the respective
meanings assigned to them in such Certificate of Designations.

Dated: __________________
                                            --------------------------------


                                            by:_____________________________
                                               Name:
                                               Title:


             Fill in for registration of Series D Preferred Stock:

Please print name and address
(including zip code number) :

- --------------------------
- --------------------------
- --------------------------
- --------------------------

                          CERTIFICATE OF DESIGNATIONS,
                             PREFERENCES AND RIGHTS

                                       OF

                SERIES E CUMULATIVE CONVERTIBLE NON-EXCHANGEABLE
                                 PREFERRED STOCK

                                       OF

                         SHEFFIELD PHARMACEUTICALS, INC.

                                 ---------------

                           Pursuant to Section 151 of
              the General Corporation Law of the State of Delaware


               Sheffield  Pharmaceuticals,  Inc., a  corporation  organized  and
existing  under  the  General  Corporation  Law of the  State of  Delaware  (the
"Corporation"),  hereby  certifies  that the  following  resolutions  were  duly
adopted by the Board of  Directors of the  Corporation  at a meeting duly called
and held on October 15, 1999  pursuant to authority of the Board of Directors as
required by Section 151 of the General Corporation Law of the State of Delaware:

               RESOLVED, that pursuant to the authority expressly granted to and
vested in the Board of Directors of the  Corporation  (the "Board" or the "Board
of  Directors") by the provisions of the  Certificate  of  Incorporation  of the
Corporation (the "Certificate of Incorporation"), out of the 3,000,000 shares of
preferred  stock  of  the  Corporation  authorized  in  Article  FOURTH  of  the
Certificate of Incorporation (the "Preferred Stock"),  there hereby is created a
series of Preferred  Stock  consisting of 9,000 shares,  which series shall have
the following  powers,  designations,  preferences and relative,  participating,
optional or other rights,  and the  following  qualifications,  limitations  and
restrictions  (in  addition  to  the  powers,  designations,   rights,  and  the
qualifications,  limitations and  restrictions,  set forth in the Certificate of
Incorporation which are applicable to the Preferred Stock).


<PAGE>
                                    ARTICLE 1
                             DESIGNATION AND AMOUNT

               The  shares  of such  series  shall be  designated  as  "Series E
Cumulative  Convertible   Non-Exchangeable   Preferred  Stock"  (the  "Series  E
Preferred Stock") and the authorized  number of shares  constituting such series
shall be 9,000  shares.  The par value of the Series E Preferred  Stock shall be
$.01 per share.  The stated  value of the Series E Preferred  Stock shall be One
Thousand Dollars ($1,000) per share (the "Stated Value").


                                    ARTICLE 2
                                   DEFINITIONS

               The  terms  defined  in  this  Article   whenever  used  in  this
Certificate of Designations have the following respective meanings:

               (a) "AMEX" means the American Stock Exchange.

               (b) "Business Day" means a day other than Saturday, Sunday or any
day on which banks located in the State of New York are  authorized or obligated
to close.

               (c)  "Common  Shares" or "Common  Stock"  means  shares of common
stock, $.01 par value, of the Corporation.

               (d)  "Conversion  Date" means any day on which all or any portion
of shares of the Series E Preferred  Stock is converted in  accordance  with the
provisions hereof.

               (e) "Conversion Notice" has the meaning set forth in Section 6.1.

               (f) "Conversion Price" has the meaning set forth in Section 6.1.

               (g)  "Corporation"  means  Sheffield  Pharmaceuticals,   Inc.,  a
Delaware  corporation,  and any  successor  or resulting  corporation  by way of
merger,  consolidation,  sale or  exchange  of all or  substantially  all of the
Corporation's assets, or otherwise.



<PAGE>

               (h) "Current Market Price" on any date of determination means the
closing price of a Common Share on such day as reported on the AMEX, or, if such
security  is not listed or  admitted  to trading on the AMEX,  on the  principal
national  security exchange or quotation system on which such security is quoted
or listed or  admitted  to  trading,  or, if not quoted or listed or admitted to
trading on any national  securities exchange or quotation system, the average of
the closing bid and ask prices of such security on the  over-the-counter  market
on  the  day  in  question  as  reported  by  the  National   Quotation   Bureau
Incorporated,  or a similar generally accepted  reporting service,  or if not so
available, in such manner as furnished by any Nasdaq member firm of the National
Association of Securities Dealers,  Inc. selected from time to time by the Board
of Directors of the Corporation for that purpose,  or a price determined in good
faith by the Board of  Directors of the  Corporation  as being equal to the fair
market value thereof, as the case may be.

               (i) "Dividend Notes" have the meaning set forth in Section 4.1.

               (j) "Dividend  Payment Date" has the meaning set forth in Section
4.1.

               (k) "Dividend Period" has the meaning set forth in Section 4.1.

               (l)  "Dividend  Shares"  means the  shares of Series E  Preferred
Stock issued as dividends on outstanding  shares of Series E Preferred  Stock in
accordance with Article 4 hereof.

               (m)  "Dollars"  or "$" means  currency  of the  United  States of
America.

               (n) "Exchange Note" has the meaning set forth in Section 7.01.

               (o)  "Holder" or  "Holders"  means Elan  International  Services,
Ltd., a Bermuda corporation, any successor thereto, or any Person(s) to whom the
Series E Preferred  Stock is  subsequently  transferred  in accordance  with the
provisions hereof.

               (p)  "Issue  Date"  means the date of  original  issuance  of the
applicable share of Series E Preferred Stock.

               (q) "Junior Securities" has the meaning set forth in Article 3.

               (r) "Liquidation Preference" has the meaning set forth in Section
5.1(b).

               (s) "Original Holder" means Elan International  Services,  Ltd, a
Bermuda  exempted  limited  liability  company  incorporated  under  the laws of
Bermuda  and its  affiliates  (as that  term is  defined  under  the  Securities
Exchange Act of 1934, as amended).

               (t) "Original Issue Date" means the date of the initial  issuance
of shares of Series E Preferred Stock.

               (u) "Pari Passu  Securities" has the meaning set forth in Article
3.

               (v) "Person" means an individual,  a corporation,  a partnership,
an  association,   a  limited  liability  company,  a  unincorporated   business
organization,  a trust or other entity or  organization,  and any  government or
political subdivision or any agency or instrumentality thereof.

               (w) "Rights" has the meaning set forth in Section 6.2(e).

                                      -3-
<PAGE>

               (x) "Securities Purchase Agreement" means the Securities Purchase
Agreement,  dated as of October  18,  1999,  between  the  Corporation  and Elan
International Services, Ltd.

               (y) "Stated Value" has the meaning set forth in Article 1.

               (z) "Trading  Day" means any day on which  purchases and sales of
securities  authorized for quotation on the AMEX are reported thereon or, if the
Common  Stock is not listed or admitted  to trading on the AMEX,  a day on which
the principal national  securities  exchange on which the Common Stock is listed
or  admitted  to trading is open for the  transaction  of  business,  or, if the
Common Stock is not so listed or admitted to trading on any national  securities
exchange,  a day on which the Nasdaq National Market (or any successor  thereto)
or such other system then in use is open for the transaction of business, or, if
the Common  Stock is not quoted by any such  organization,  any day other than a
Saturday, Sunday or a day on which banking institutions in the State of New York
are authorized or obligated by law or executive order to close.


                                    ARTICLE 3
                                      RANK

               The Series E  Preferred  Stock shall rank (i) prior to the Common
Stock;  (ii)  prior to any class or series of capital  stock of the  Corporation
hereafter  created  other than Pari  Passu  Securities  (collectively,  with the
Common Stock, the "Junior Securities");  (iii) pari passu with the Corporation's
Series C  Cumulative  Convertible  Preferred  Stock  (the  "Series  C  Preferred
Stock");   (iv)  pari  passu  with  the   Corporation's   Series  D  Convertible
Exchangeable  Preferred Stock (the "Series D Preferred  Stock");  (v) pari passu
with the  Corporation's  Series F Convertible  Non-Exchangeable  Preferred Stock
(the "Series F Preferred  Stock");  and (vi) pari passu with any class or series
of capital stock of the Corporation  hereafter created  specifically  ranking on
parity  with the  Series E  Preferred  Stock  (collectively,  with the  Series C
Preferred  Stock, the Series D Preferred Stock and the Series F Preferred Stock,
the "Pari Passu Securities").

                                    ARTICLE 4
                                    DIVIDENDS

         SECTION 4.1

               (a) (i)  Subject to Article 6, the Holder  shall be  entitled  to
receive, out of funds legally available for the payment of dividends,  dividends
at the rate of 9.0% per annum  (computed  on the basis of a 360-day  year)  (the
"Dividend  Rate")  on the  Stated  Value of each  outstanding  share of Series E
Preferred Stock payable on and as of the most recent Dividend  Payment Date with
respect to each Dividend Period. Dividends on the Series E Preferred Stock shall
be cumulative  from the date of issue or the most recent  Dividend  Payment Date
upon  which  dividends  have been paid on the  Series E  Preferred  Stock by the
Corporation.


                                      -4-


<PAGE>

                    (ii)  Dividends  on the Series E  Preferred  Stock  shall be
payable in equal  semi-annual  installments  on April 18 and  October 18 of each
year (each, a "Dividend  Payment  Date"),  commencing  April 18, 2000 and ending
October 18,  2005,  to the holders of record of shares of the Series E Preferred
Stock,  as they appear on the stock records of the  Corporation  at the close of
business  on any  record  date,  not  more  than 60  days  or less  than 10 days
preceding  the  payment  dates  thereof,  as  shall  be  fixed  by the  Board of
Directors.  For the purposes hereof,  "Dividend Period," in respect of any share
of Series E Preferred Stock,  shall mean the period commencing on April 18, 2000
and, thereafter, the semiannual period commencing on and including the day after
the immediately  preceding Dividend Payment Date and ending on and including the
immediately  subsequent  Dividend Payment Date. Accrued and unpaid dividends for
any past Dividend Period may be declared and paid at any time, without reference
to any Dividend  Payment Date, to holders of record on such date,  not more than
15 days  preceding  the payment  date  thereof,  as may be fixed by the Board of
Directors.

                    (iii)  Dividends  on the  outstanding  shares  of  Series  E
Preferred  Stock  shall  be  paid  through  the  issuance  of duly  and  validly
authorized  and  issued,  fully  paid  and  non-assessable  shares  of  Series E
Preferred  Stock to be issued at the rate of one (1) share of Series E Preferred
Stock for each $1,000 of dividend due and payable.  No fractional  shares of the
Series E  Preferred  Stock shall be issued as  Dividend  Shares.  Instead of any
fractional  shares of Series E Preferred Stock which would otherwise be issuable
as Dividend  Shares,  the Corporation  shall pay a cash adjustment in respect of
such  fractional  interest  in an amount  equal to $1,000  times the  fractional
interest.

               (b) The Holder  shall not be entitled to any  dividends in excess
of the  cumulative  dividends,  as herein  provided,  on the Series E  Preferred
Stock.  Except as provided in this  Article 4, no  interest,  or sum of money in
lieu of  interest,  shall be  payable  in  respect  of any  dividend  payment or
payments on the Series E Preferred Stock that may be in arrears.

               (c) In  the  event  that,  after  the  first  anniversary  of the
Original  Issue  Date,  the  payment of any  Dividend  Shares  upon the Series E
Preferred  Stock to the Original  Holder  would result in the Original  Holder's
fully-diluted  ownership of Common Stock  (assuming the  conversion  into Common
Stock of all options,  warrants and other securities convertible or exchangeable
into Common Stock  beneficially owned by the Original Holder) to exceed 49.9% of
the then  outstanding  Common Stock,  such excess dividends shall be paid to the
Original Holder through  issuance by the Corporation of promissory notes with an
aggregate  principal  amount equal to each dividend  payment amount then payable
(collectively,  the  "Dividend  Notes").  Each  Dividend Note shall be issued in
substantially   the  form  attached  as  Exhibit  A  to  this   Certificate   of
Designations.  It shall be a condition to the Corporation's  obligation to issue
Dividend Notes in respect of any such excess  dividends that the Original Holder
deliver to the  Corporation,  at least 15 days  before the  applicable  Dividend
Payment Date, a certificate (i) certifying  that the Dividend  Shares  otherwise
issuable  on such  Dividend  Payment  Date  shall  cause the  Original  Holder's
beneficial  ownership  to exceed such 49.9%  amount and (ii)  demonstrating  the
calculation of the principal amount of the Dividend Note to be issued in lieu of
the applicable excess Dividend Shares.


                                      -5-
<PAGE>

                                    ARTICLE 5
                             LIQUIDATION PREFERENCE

         SECTION 5.1

               (a) If the Corporation  shall commence a voluntary case under the
Federal  bankruptcy laws or any other  applicable  Federal or State  bankruptcy,
insolvency  or similar law, or consent to the entry of an order for relief in an
involuntary case under any law or to the appointment of a receiver,  liquidator,
assignee,  custodian,  trustee,  sequestrator (or other similar official) of the
Corporation or of any  substantial  part of its property,  or make an assignment
for the benefit of its  creditors,  or admit in writing its inability to pay its
debts  generally  as they  become  due,  or if a decree or order  for  relief in
respect of the  Corporation  shall be entered by a court having  jurisdiction in
the premises in an  involuntary  case under the Federal  bankruptcy  laws or any
other  applicable  Federal  or  state  bankruptcy,  insolvency  or  similar  law
resulting in the  appointment of a receiver,  liquidator,  assignee,  custodian,
trustee,  sequestrator (or other similar  official) of the Corporation or of any
substantial  part of its property,  or ordering the winding up or liquidation of
its affairs,  and any such decree or order shall be unstayed and in effect for a
period of ninety (90)  consecutive  days and, on account of any such event,  the
Corporation  shall liquidate,  dissolve or wind up, or if the Corporation  shall
otherwise  liquidate,  dissolve or wind up (each such event being  considered  a
"Liquidation Event"), no distribution shall be made to the holders of any Junior
Securities of the Corporation upon liquidation, dissolution or winding up unless
prior  thereto,  the  Holders,  subject to Article  5, shall have  received  the
Liquidation  Preference  (as  defined in Article  5.1(b))  with  respect to each
share.  If upon the  occurrence  of a  Liquidation  Event,  the assets and funds
available for distribution among the Holders and holders of shares of Pari Passu
Securities  shall be  insufficient  to permit the payment to such holders of the
preferential  amounts payable  thereon,  then the entire assets and funds of the
Corporation  legally  available for distribution to the Series E Preferred Stock
and the Pari Passu Securities shall be distributed  ratably among such shares in
proportion to the ratio that the preferential amounts payable on each such share
bears to the aggregate preferential amounts payable on all such shares.

               (b)  For  purposes  hereof,  the  "Liquidation  Preference"  with
respect to a share of the Series E Preferred Stock shall mean an amount equal to
(i) the Stated Value thereof,  plus (ii) the aggregate of all accrued and unpaid
dividends  on such  share of Series E  Preferred  Stock  until  the most  recent
Dividend  Payment Date;  provided  that, in the event of an actual  liquidation,
dissolution or winding up of the  Corporation,  the amount referred to in clause
(ii) above shall be calculated by including  accrued and unpaid stock  dividends
to the actual date of such  liquidation,  dissolution or winding up, rather than
the applicable Dividend Payment Due Date referred to above.


                                      -6-
<PAGE>
                                    ARTICLE 6
                     CONVERSION OF SERIES E PREFERRED STOCK

         SECTION 6.1   Conversion.

               (a) Holders of shares of the Series E Preferred  Stock shall have
the right,  exercisable at any time after the second anniversary of the Original
Issue Date and prior to the sixth  anniversary  of the Original  Issue Date,  to
convert all or any such  shares of the Series E Preferred  Stock into the number
of shares of Common  Stock  (calculated  as to each  conversion  to the  nearest
1/100th  of a  share)  determined  by  dividing  (1) the  aggregate  Liquidation
Preference  of the shares of Series E  Preferred  Stock to be  converted  by (2)
$3.89 (the "Conversion Price").  Upon conversion,  no adjustment or payment will
be made for  dividends,  but if any  holder  surrenders  a share of the Series E
Preferred  Stock for  conversion  after the close of business on the record date
for the  payment of a dividend  and prior to the opening of business on the next
Dividend  Payment Date,  then,  notwithstanding  such  conversion,  the dividend
payable on such Dividend  Payment Date will be paid to the registered  holder of
such share on such record date. In such event,  such share, when surrendered for
conversion  during the period  between  the close of  business  on any  dividend
payment  record date and the opening of business on the  corresponding  Dividend
Payment Date,  must be accompanied by payment of an amount equal to the dividend
payable on such Dividend Payment Date on the share so converted.

               (b) Any  holder of a share or shares  of the  Series E  Preferred
Stock  electing  to  convert  such share or shares  thereof  shall  deliver  the
certificate or certificates  therefor to the principal office of the Corporation
or any transfer agent for the Common Stock,  with the form of notice of election
to  convert  attached  as Exhibit C to this  Certificate  of  Designations  (the
"Conversion Notice"), fully completed and duly executed and (if such required by
the Corporation or any conversion agent)  accompanied by instruments of transfer
in form  satisfactory  to the  Corporation  and to any  conversion  agent,  duly
executed  by  the  registered  Holder  of  his  duly  authorized  attorney.  The
conversion  right with  respect to any such shares  shall be deemed to have been
exercised at the date upon which the certificates  therefore accompanied by such
duly  executed  notice of election and  instruments  of transfer and such taxes,
stamps,  funds,  or evidence of payment  shall have been so  delivered,  and the
Person or Persons  entitled to receive the shares of the Common  Stock  issuable
upon such  conversion  shall be treated for all purposes as the record Holder or
Holders of such shares of the Common Stock upon said date.

               (c) From and  after  the  delivery  of the  Conversion  Notice in
respect of any conversion of shares of Series E Preferred Stock, all such shares
of Series E Preferred  Stock shall be deemed to have been  converted into shares
of  Common  Stock  as of  the  applicable  Conversion  Date  at  the  applicable
conversion  rate,  all stock  dividends on such shares of the Series E Preferred
Stock shall cease to accrue, and all rights of the Holders thereof as holders of
Series E  Preferred  Stock,  except the right to receive  all accrued and unpaid
stock  dividends to such  Conversion Date at the applicable rate for such shares
of Series E Preferred Stock and the right to receive  certificates  representing
shares of Common Stock issuable upon the  conversion of such shares  (including,
without limitation, with respect to such stock dividends, as applicable),  shall
cease  and  terminate,  such  shares  of  Series E  Preferred  Stock  shall  not
thereafter be transferred  (except with the consent of the Corporation) and such
shares shall not be deemed to be outstanding for any purpose whatsoever.



                                      -7-
<PAGE>

               (d)  No   fractional   shares  of  the  Common   Stock  or  scrip
representing  fractional shares shall be issued upon conversion of shares of the
Series E Preferred Stock. If more than one share of the Series E Preferred Stock
shall be surrendered  for conversion at one time by the same holder,  the number
of full  shares of the Common  Stock which  shall be  issuable  upon  conversion
thereof shall be computed on the basis of the aggregate  number of shares of the
Series E Preferred Stock so surrendered. Instead of any fractional shares of the
Common Stock which would  otherwise be issuable upon conversion of any shares of
the Series E Preferred  Stock,  the  Corporation  shall pay a cash adjustment in
respect of such  fraction in an amount equal to the same fraction of the Current
Market  Price  for the  Common  Stock  on the last  Trading  Day  preceding  the
applicable date of conversion.

               (e) Each  Conversion  Notice under this Section 6.1 shall request
the  conversion  of at least  500  shares  of  Series E  Preferred  Stock or the
remaining  balance of Series E Preferred  Stock held by the  converting  Holder,
whichever is less.

          SECTION 6.2 Adjustments. The Conversion Price and the number of shares
issuable  upon  conversion  of the  Series E  Preferred  Stock  are  subject  to
adjustment from time to time as follows:

               (a)  Merger,  Sale of  Assets,  Etc.  Notwithstanding  any  other
limitation  whatsoever  contained  herein,  if at any time  while  the  Series E
Preferred  Stock, or any portion  thereof,  is outstanding  there shall be (i) a
reorganization  (other  than  a  combination,   reclassification,   exchange  or
subdivision  of  shares  otherwise  provided  for  herein),  (ii)  a  merger  or
consolidation of the Corporation  with or into another  corporation in which the
Corporation is the surviving entity but the shares of the Corporation's  capital
stock outstanding immediately prior to the merger are converted by virtue of the
merger  into  other  property,  whether  in the  form  of  securities,  cash  or
otherwise,  or (iii) a sale or  transfer  of the  Corporation's  properties  and
assets as, or substantially as, an entirety to any other Person,  then as a part
of such reorganization, merger, consolidation, sale or transfer lawful provision
shall be made so that the Holder  shall  thereafter  be entitled to receive upon
conversion of the Series E Preferred Stock,  during the period specified herein,
the number of shares of stock or other  securities  or property of the successor
corporation resulting from such reorganization,  merger, consolidation,  sale or
transfer   that  the  Holder  would  have  been  entitled  to  receive  in  such
reorganization,  consolidation,  merger,  sale  or  transfer  if  the  Series  E
Preferred  Stock had been  converted  immediately  before  such  reorganization,
merger,  consolidation,  sale or transfer,  all subject to further adjustment as
provided in this Section 6.2(a). The foregoing provisions of this Section 6.2(a)
shall similarly apply to successive reclassification,  changes,  consolidations,
mergers,  mandatory  share  exchanges and sales and transfers.  If the per share
consideration  payable to the holder  hereof for shares in  connection  with any
such transaction is in a form other than cash or marketable securities, then the
value of such  consideration  shall be  determined in good faith by the Board of
Directors. In all events, appropriate adjustment (as determined in good faith by
the Board of Directors)  shall be made in the  application  of the provisions of
this Certificate of Designations with respect to the rights and interests of the
Holder after the transaction, to the end that the provisions of this Certificate
of Designations  shall be applicable after that event, as near as reasonably may
be, in relation  to any shares or other  property  deliverable  after that event
upon conversion of the Series E Preferred Stock.

                                      -8-
<PAGE>

               (b) Reclassification,  Etc. If the Corporation, at any time while
the Series E Preferred Stock, or any portion thereof, remains outstanding, shall
change  any  of  the  securities  as  to  which  conversion  rights  under  this
Certificate  of  Designations  exist  into the  same or a  different  number  of
securities  of any other  class or classes,  the Series E Preferred  Stock shall
thereafter  represent the right to acquire such number and kind of securities as
would  have been  issuable  as the  result of such  change  with  respect to the
securities that were subject to the conversion  rights under this Certificate of
Designations  immediately prior to such reclassification or other change and the
Conversion  Price  therefor  shall be  appropriately  adjusted,  all  subject to
further adjustment as provided in this Certificate of Designations.

               (c)  Split,   Subdivision  or  Combination  of  Shares.   If  the
Corporation  at any time  while the Series E  Preferred  Stock,  or any  portion
thereof, remains outstanding shall split, subdivide or combine the securities as
to which conversion rights under this Certificate of Designations  exist, into a
different  number of securities of the same class, the Conversion Price shall be
proportionately   decreased   in  the  case  of  a  split  or   subdivision   or
proportionately increased in the case of a combination.

               (d)  Adjustments  for Dividends in Stock and Other  Securities or
Property. If while the Series E Preferred Stock, or any portion hereof,  remains
outstanding,  the holders of the securities as to which conversion  rights under
this Certificate of Designations  exist at the time shall have received,  or, on
or after the record date fixed for the determination of eligible stockholders of
the  Corporation,  shall  have  become  entitled  to  receive,  without  payment
therefor,  other or additional stock or other securities or property (other than
cash) of the Corporation by way of dividend, then and in each case, the Series E
Preferred  Stock shall  represent  the right to  acquire,  upon  conversion,  in
addition to the number of shares of the security  receivable  upon conversion of
the  Series  E  Preferred   Stock,   and  without   payment  of  any  additional
consideration  therefor,  the amount of such other or additional  stock or other
securities  or  property  (other than cash) of the  Corporation  that the Holder
would  hold on the date of such  conversion  had it been the holder of record of
the security  receivable  upon conversion of the Series E Preferred Stock on the
date  hereof and had  thereafter,  during the period from the date hereof to and
including the date of such  conversion,  retained such shares and/or  additional
stock  available by it as aforesaid  during such  period,  giving  effect to all
adjustments called for during such period by the provisions of this Section 6.2.

               (e) Repurchases or Redemptions of Common Stock or Options. If the
Corporation  at  any  time  while  shares  of  Series  E  Preferred   Stock  are
outstanding,  shall repurchase or redeem any outstanding  shares of Common Stock
or rights,  options or warrants granting the holder thereof the right to acquire
shares of Common Stock (collectively, the "Rights") in a single transaction or a
series of related  transactions  involving an aggregate repurchase or redemption
price in excess of $500,000 at a price (on a per share  basis)  which is greater
than 150% of the Current Market Price as of the day prior to such  repurchase or
redemption,  the Conversion Price shall thereupon be adjusted by multiplying the
Conversion  Price in effect  immediately  prior to the applicable  repurchase or
redemption  by a fraction  (i) the  numerator  of which shall be the  Conversion
Price in effect  immediately prior to such repurchase or redemption and (ii) the


                                      -9-

<PAGE>

denominator of which shall be the fair market value of the consideration paid by
the  Corporation  for each share of Common  Stock (or each share of Common Stock
issuable upon exercise of the Right(s) subject to such repurchase or redemption)
in such repurchase or redemption.

               (f)  Certificate as to  Adjustments.  Upon the occurrence of each
adjustment or readjustment  pursuant to this Section 6.2, the Corporation at its
expense shall promptly  compute such  adjustment or  readjustment  in accordance
with the terms hereof and furnish to the Holder a certificate setting forth such
adjustment  or  readjustment  and  showing  in detail  the facts upon which such
adjustment or readjustment is based.

               (g) Cumulative Adjustments. No adjustment in the Conversion Price
shall be required until cumulative adjustments result in a concomitant change of
1% or more of the Conversion  Price as in effect prior to the last adjustment of
the Conversion Price; provided, however, that any adjustments which by reason of
this Section 6.2 are not required to be made shall be carried  forward and taken
into account in any subsequent  adjustment.  All calculations under this Section
6.2  shall be made to the  nearest  cent or to the  nearest  one-hundredth  of a
share,  as the case may be. No adjustment to the Conversion  Price shall be made
for cash dividends.


                                    ARTICLE 7

                                 EXCHANGE RIGHTS

         SECTION 7.01 Mandatory Exchange.  On or before the first anniversary of
the Original Issue Date, the Corporation  shall notify each Holder,  in writing,
(i) that the  issuance of the Series E Preferred  Stock,  and the  issuance  and
listing upon the American Stock Exchange  ("AMEX") of the shares of Common Stock
issuable upon conversion of the Series E Preferred  Stock,  has been approved or
ratified by the  stockholders  of the Corporation in accordance with the General
Corporation  Law of the State of Delaware  and the rules and  regulation  of the
AMEX  or  (ii)  that  such  approval  or  ratification  is not  required  by the
applicable rules of the AMEX. In the event that the Corporation fails to provide
such written  notice on or before the first  anniversary  of the Original  Issue
Date,  (A) all  outstanding  shares of Series E Preferred  Stock shall be deemed
exchanged for promissory note(s) in substantially the form of Exhibit B attached
to this Certificate of Designations  (the "Exchange  Notes"),  in the respective
principal amounts equal to the aggregate Liquidation Preference of all shares of
Series E Preferred Stock held by each  respective  Holder as of the date of such
exchange  and (B) from and after the first  anniversary  of the  Original  Issue
Date, all shares of Series E Preferred Stock  (including  Dividend Shares) shall
be deemed to have been exchanged for Exchange Notes, all dividends on the Series
E Preferred  Stock shall cease to accrue,  and all rights of Holders  thereof as
holders of Series E Preferred  Stock shall cease and terminate and all shares of
Series E  Preferred  Stock  shall  not be  deemed  outstanding  for any  purpose
whatsoever,  except the right to receive the Exchange  Notes issuable to them as
determined above.


                                      -10-
<PAGE>

                                    ARTICLE 8
                                  VOTING RIGHTS

         The  holders  of the  Series E  Preferred  Stock  shall  have no voting
rights, except as otherwise provided by the General Corporation Law of the State
of Delaware ("DGCL") and in this Article 8, and in Article 9 below.

         The  Corporation  shall provide each Holder of Series E Preferred Stock
with prior  notification  of any meeting of the  shareholders of the Corporation
(and copies of proxy materials and other information sent to  shareholders).  In
the event of any taking by the Corporation of a record of its  shareholders  for
the purpose of determining  shareholders  who are entitled to receive payment of
any  dividend or other  distribution,  any right to subscribe  for,  purchase or
otherwise   acquire   (including   by   way   of   merger,    consolidation   or
recapitalization) any share of any class or any other securities or property, or
to receive any other right, or for the purpose of determining  shareholders  who
are entitled to vote in connection with any proposed liquidation, dissolution or
winding  up of the  Corporation,  the  Corporation  shall  mail a notice to each
Holder,  at least thirty (30) days prior to the  consummation of the transaction
or event,  whichever is earlier),  of the date on which any such action is to be
taken for the purpose of such dividend,  distribution, right or other event, and
a  brief  statement  regarding  the  amount  and  character  of  such  dividend,
distribution, right or other event to the extent known at such time.

         To the extent that under the DGCL the vote of the Holders of the Series
E Preferred  Stock,  voting  separately as a class or series as  applicable,  is
required to authorize a given action of the Corporation, the affirmative vote or
consent  of the  Holders  of at least a  majority  of the shares of the Series E
Preferred Stock  represented at a duly held meeting at which a quorum is present
or by written  consent of a majority of the shares of Series E  Preferred  Stock
(except as  otherwise  may be  required  under the DGCL)  shall  constitute  the
approval of such action by the class.  To the extent that under the DGCL Holders
of the Series E Preferred Stock are entitled to vote on a matter with Holders of
Common  Stock,  voting  together as one class,  each share of Series E Preferred
Stock  shall be  entitled  to a number of votes equal to the number of shares of
Common  Stock into which such shares are  convertible  as of the record date for
the taking of such vote of shareholders. Holders of the Series E Preferred Stock
shall be entitled to notice of all shareholder meetings or written consents (and
copies of proxy  materials  and other  information  sent to  shareholders)  with
respect to which they would be entitled as of right under the DGCL, which notice
would be provided pursuant to the Corporation's bylaws and the DGCL.

                                    ARTICLE 9
                              PROTECTIVE PROVISIONS

         So long as shares  of Series E  Preferred  Stock are  outstanding,  the
Corporation  shall not, without first obtaining the approval (by vote or written
consent,  as  provided by the DGCL) of the Holders of at least a majority of the
then outstanding shares of Series E Preferred Stock:

               (a)  create  any new class or series of  capital  stock  having a
preference superior to the Series E Preferred Stock as to distribution of assets
upon  liquidation,  dissolution  or  winding  up  of  the  Corporation  ("Senior
                                      -11-

<PAGE>

Securities")  or alter or change the rights,  preferences  or  privileges of any
Senior Securities so as to affect adversely the Series E Preferred Stock; or

               (b) amend or alter whether by merger, consolidation or otherwise,
any of the  provisions  of the  Certificate  of  Incorporation  (including  this
Certificate  of  Designations)  that  would  change the  preferences,  rights or
privileges  with  respect  to the Series E  Preferred  Stock so as to affect the
Series E Preferred Stock adversely.

         In the event  holders  of at least a majority  of the then  outstanding
shares of Series E Preferred  Stock agree to allow the  Corporation  to amend or
alter the preferences,  rights or privileges of the shares of Series E Preferred
Stock,  pursuant to subsection (b) above, so as to affect adversely the Series E
Preferred  Stock,  then the  Corporation  will deliver  notice of such  approved
change to the Holders of the Series E Preferred Stock that did not agree to such
amendment or change (the "Dissenting  Holders") and the Dissenting Holders shall
have the right for a period of thirty  (30) days to convert  pursuant to Section
6.1 of this  Certificate of  Designations as they exist prior to such alteration
or  continue  to hold their  shares of Series E Preferred  Stock.  The  Holders'
rights under this  Article 9 shall  terminate  on the sixth  anniversary  of the
Original Issue Date.


                                   ARTICLE 10
                                  MISCELLANEOUS

         SECTION 10.1 Loss, Theft, Destruction of Series E Preferred Stock. Upon
receipt  of  evidence  satisfactory  to  the  Corporation  of the  loss,  theft,
destruction or mutilation of shares of Series E Preferred Stock and, in the case
of any such loss,  theft or  destruction,  upon receipt of indemnity or security
reasonably  satisfactory  to the  Corporation,  or,  in  the  case  of any  such
mutilation, upon surrender and cancellation of the Series E Preferred Stock, the
Corporation  shall  make,  issue  and  deliver,  in lieu of such  lost,  stolen,
destroyed or mutilated  shares of Series E Preferred Stock, new shares of Series
E Preferred Stock of like date and tenor.

         SECTION 10.2 Who Deemed  Absolute  Owner.  The Corporation may deem the
Person in whose name the Series E Preferred  Stock shall be registered  upon the
registry books of the Corporation to be, and may treat it as, the absolute owner
of the  Series E  Preferred  Stock  for the  purpose  of  receiving  payment  of
dividends on the Series E Preferred  Stock,  for the  conversion of the Series E
Preferred  Stock and for all other purposes,  and the  Corporation  shall not be
affected by any notice to the contrary.  All such  payments and such  conversion
shall be valid and effectual to satisfy and  discharge  the  liability  upon the
Series  E  Preferred  Stock  to the  extent  of the  sum or  sums so paid or the
conversion so made.

         SECTION 10.3  Register.  The  Corporation  shall keep at its  principal
office a register in which the Corporation shall provide for the registration of
the Series E Preferred Stock.  Upon any transfer of the Series E Preferred Stock
in accordance with the provisions  hereof,  the Corporation  shall register such
transfer on the Series E Preferred Stock register.
                                      -12-

<PAGE>

         SECTION 10.4 Withholding. To the extent required by applicable law, the
Corporation  may  withhold  amounts  for or on account  of any taxes  imposed or
levied by or on behalf of any  taxing  authority  in the  United  States  having
jurisdiction  over the Corporation from any payments made pursuant to the Series
E Preferred Stock.

         SECTION  10.5  Headings.  The  headings of the Articles and Sections of
this  Certificate of Designations  are inserted for convenience  only and do not
constitute a part of this Certificate of Designations.




                                      -13-
<PAGE>


         IN WITNESS  WHEREOF,  the  Corporation  has caused this  Certificate of
Designations,  Preferences  and  Rights to be signed by Loren G.  Peterson,  its
President and Chief Executive  Officer,  and attested by Scott A. Hoffmann,  its
Secretary, on this 18th day of October, 1999.

                                       SHEFFIELD PHARMACEUTICALS, INC.



                                      By:/s/ Loren G. Peterson
                                         ---------------------------------------
                                           Loren G. Peterson
                                           President and Chief Executive Officer


Attested:


By: /s/ Scott A. Hoffman
    ------------------------
    Scott A. Hoffmann
    Secretary

<PAGE>
                                                                       Exhibit A

                              FORM OF DIVIDEND NOTE


                         SHEFFIELD PHARMACEUTICALS, INC.



U.S. $___________                                           ____________, 20__


The  undersigned,  Sheffield  Pharmaceuticals,   Inc.,  a  Delaware  corporation
("Sheffield"),  for  value  received,  hereby  promises  to pay to the  order of
____________________________  (the  "Investor")  or its  permitted  assigns (the
"Holder"),  at such place as may be designated  by the Holder to Sheffield,  the
sum of  ______________________  dollars  ($___________),  plus  interest  on the
unpaid  principal  balance at the rate specified  below,  in accordance with the
provisions set forth herein. During the term of this Note, interest shall accrue
at the rate of 9.0% per  annum  (calculated  on the  basis of a year of 360 days
comprised of 12 30-day months).  Accrued interest shall be payable (i) quarterly
in arrears on the first day of January, April, July and October of each year and
(ii) in-kind through the issuance of additional notes in like tenor to this Note
(the "Interest Notes").  The full principal amount of this Note and all Interest
Notes,  including  any  accrued  interest  thereon,  shall be due and payable on
October 18, 2005 (the "Maturity Date").  This Note is originally being issued as
payment of dividends due on shares of Series E Preferred  Stock,  par value $.01
per share,  of Sheffield (the "Series E Preferred  Stock"),  the rights of which
are  designated in the  Certificate  of  Designations  of the Series E Preferred
Stock of  Sheffield  (the  "Certificate  of  Designations"),  and  pursuant to a
certain  Securities  Purchase  Agreement,  dated October 18, 1999 (the "Original
Issue Date"),  between  Sheffield  and Elan  International  Services,  Ltd. (the
"Purchase Agreement"). All Notes issued as payment of dividends due on shares of
Series E Preferred  Stock,  including  the Interest  Notes,  or upon transfer or
exchange of other Notes are referred to herein as the "Notes."

All capitalized  terms used in this Note and not otherwise  defined herein shall
have the meaning assigned to such terms in the Certificate of Designations.

The  following is a statement of the rights of the Holder and the  conditions to
which this Note is subject, and to which the Holder hereof, by the acceptance of
this Note, agrees:

         1. Exchange or Replacement of Note.

               (a)  The  Holder,  at  its  option,  may  in  person  or by  duly
authorized attorney surrender this Note for exchange, at the office or agency of
Sheffield  and  receive in  exchange  therefor a new Note in the same  aggregate
principal amount as the unpaid principal amount of the Note so surrendered, each


<PAGE>

such new Note to be dated as of the date to which  interest has been paid on the
Note so surrendered and payable to the Holder or its assignee, as the Holder may
designate in writing  (subject to the restrictions on transfer set forth in this
Note and in the Purchase Agreement).

               (b) Upon receipt by Sheffield of evidence  satisfactory  to it of
the loss, theft, destruction,  or mutilation of this Note, and (in case of loss,
theft or  destruction)  of  indemnity  reasonably  satisfactory  to it, and upon
reimbursement to Sheffield of all reasonable expenses  incidental  thereto,  and
upon surrender and cancellation of this Note, if mutilated, Sheffield shall make
and  deliver a new Note of like  tenor in lieu of this  Note.  Any Note made and
delivered in accordance with this paragraph shall be dated the date hereof.

         2. Amendments.  This Note may not be amended, modified or waived in any
respect unless set forth in writing and signed by the Holder, in the case of any
change hereto, including any change in the amount or timing of any payment to be
made hereunder or any adverse change in conversion  rights  hereunder.  Any such
amendment,  modification  or waiver shall be binding upon each future  holder of
this Note.

         3. Costs and Expenses. Sheffield agrees to pay all reasonable costs and
expenses,  including  reasonable  attorneys'  fees,  incurred  by the  Holder in
collecting or enforcing this Note.

         4. No Waivers.  No delay by the Holder in exercising any power or right
hereunder shall operate as a waiver of any power or right,  nor shall any single
or partial  exercise of any power or right  preclude  other or further  exercise
thereof, or the exercise of any other power or right hereunder or otherwise.

         5. Events of Default

         The occurrence of any of the following events shall constitute an event
of default (an "Event of Default"):

               (a) A default  in the  payment  of the  principal  amount of this
Note, when and as the same shall become due and payable;

               (b) a default in the payment of any  accrued and unpaid  interest
on this Note, when and as the same shall become due and payable;

               (c) a  default  in the  performance,  or a  breach  of any  other
covenant  or  agreement  of  Sheffield  in this  Note on any  other  Transaction
Document (as defined in the Purchase Agreement), and continuance of such default
or breach for a period of 10 days after the Holder has notified Sheffield of its
occurrence;

               (d)  any  representation,  warranty,  or  certification  made  by
Sheffield pursuant to this Note or any other Transaction Document shall prove to
have been false or misleading as of the date made in any material respect; or




<PAGE>

               (e) (i)  the  entry  of a  decree  or  order  by a  court  having
jurisdiction adjudging Sheffield bankrupt or insolvent,  or approving a petition
seeking reorganization,  arrangement, adjustment or composition of or in respect
of Sheffield,  and the  continuance  of any such decree or order unstayed and in
effect  for a  period  of 60 days;  (ii)  the  commencement  by  Sheffield  of a
voluntary  case  under  United  States  bankruptcy  law,  as  now  or  hereafter
constituted,  or the consent by Sheffield to the  institution  of  bankruptcy or
insolvency  proceedings  against it; (iii) the filing by Sheffield of a petition
or answer or  consent  seeking  reorganization  or relief  under  United  States
bankruptcy  law;  (iv) the  appointment  of a  receiver,  liquidator,  assignee,
trustee,  sequestrator,  or similar  official of Sheffield or of any substantial
part of its property which is not  discharged  within 30 days; or (v) the making
by Sheffield of an assignment for the benefit of creditors,  or the admission by
it in writing of its inability to pay its debts generally as they become due, or
the taking of corporate action by Sheffield in furtherance of any such action;

         6. Remedies in the Event of Default

               (a) In the  case  of any  Event  of  Default  by  Sheffield,  the
principal  amount of this Note and accrued and unpaid interest thereon shall, in
addition  to all other  rights and  remedies of the Holder  hereunder  and under
applicable law, be and become immediately due and payable.

               (b) Sheffield  hereby waives grace,  demand and  presentment  for
payment, notice of nonpayment,  protest and notice of protest, diligence, filing
suit,  and all  other  notice  and  promises  to pay the  Holder  its  costs  of
collection of all amounts due hereunder, including reasonable attorneys' fees.

               (c) Upon the occurrence and during the  continuation of any Event
of Default or breach of this Note by Sheffield  this Note shall bear interest at
the interest rate  otherwise in effect  hereunder  plus 3% per annum (but in any
event not in excess of the maximum  rate of  interest  permitted  by  applicable
law).

         7. Seniority

            This Note shall  constitute  senior  indebtedness of Sheffield,  and
Sheffield shall not incur any  indebtedness  for money borrowed which shall rank
senior  to, or pari  passu  with,  this Note  without  the prior  consent of the
holders of a majority in principal amount of the Notes;  provided,  that nothing
contained  herein shall be construed as to prevent  Sheffield from incurring and
paying  obligations in the ordinary course of business,  in accordance with past
practice.

         8. Miscellaneous

            (a) The  Investor  may assign this Note to its  affiliates  (as such
term is defined in the Securities  Exchange Act of 1934, as amended).  This Note
and all of the provisions  hereof shall be binding upon and inure to the benefit
of the parties hereto and their  respective  successors and assigns,  subject to
compliance by such assignee with the representations and warranties contained in
Section 3(e) of the Purchase Agreement.


<PAGE>

            (b) All notices, demands and requests of any kind to be delivered to
the other  party in  connection  with this Note shall be in writing and shall be
deemed  to  have  been  duly  given  if  personally  delivered  or  if  sent  by
nationally-recognized  overnight courier or by registered or certified  airmail,
return receipt requested and postage prepaid, addressed as follows:

                   to Sheffield:

                          Sheffield Pharmaceuticals, Inc.
                          South Winton Court
                          3136 Winton Road South
                          Suite 306
                          Rochester, NY  14623
                          Attention: Chairman

                   and

                          Sheffield Pharmaceuticals, Inc.
                          425 South Woodsmill Road
                          St. Louis, Missouri 63017-3441
                          Attention: Chief Executive Officer

                   with a copy to:

                          Olshan Grundman Frome, Rosenzweig & Wolosky LLP
                          505 Park Avenue
                          New York, NY  10022
                          Attention: Daniel J. Gallagher

                   to Holder:

                          at the address provided to Sheffield by the Holder.

Each party, by written notice given to the other in accordance with this Section
may change the address to which notices, other communication or documents are to
be sent to such party. All notices,  other  communications or documents shall be
deemed to have been duly given when received.  Any such notice or  communication
shall be deemed to have been received (i) in the case of personal  delivery,  on
the date of such delivery, (ii) in the case of  nationally-recognized  overnight
courier,  on the second  business  day after the date when sent and (iii) in the
case of mailing, on the fifth business day following that day on which the piece
of mail containing such  communication is posted.  Notice hereunder may be given
on behalf of the parties by their respective attorneys.

            (c) This Note shall be governed by and construed in accordance  with
the laws of the  state of New  York,  without  reference  to the  principles  of
conflicts of laws thereof.


<PAGE>

IN WITNESS  WHEREOF,  Sheffield has caused this Note to be issued as of the date
first set forth hereinabove.

                                         SHEFFIELD PHARMACEUTICALS, INC.



                                         By:________________________________
                                            Name:
                                            Title:







<PAGE>
                                                                       Exhibit B

                              FORM OF EXCHANGE NOTE

                         SHEFFIELD PHARMACEUTICALS, INC.



U.S. $___________                                             ____________, 20__


The  undersigned,  Sheffield  Pharmaceuticals,   Inc.,  a  Delaware  corporation
("Sheffield"),  for  value  received,  hereby  promises  to pay to the  order of
____________________________  (the  "Investor")  or its  permitted  assigns (the
"Holder"),  at such place as may be designated  by the Holder to Sheffield,  the
sum of  ______________________  dollars  ($___________),  plus  interest  on the
unpaid  principal  balance at the rate specified  below,  in accordance with the
provisions set forth herein. During the term of this Note, interest shall accrue
at the rate of 9.0% per  annum  (calculated  on the  basis of a year of 360 days
comprised of 12 30-day months).  Accrued interest shall be payable (i) quarterly
in arrears on the first day of January, April, July and October of each year and
(ii) in-kind through the issuance of additional notes in like tenor to this Note
(the "Interest Notes").  The full principal amount of this Note and all Interest
Notes,  including  any  accrued  interest  thereon,  shall be due and payable on
October 18, 2005 (the "Maturity Date").  This Note is originally being issued in
exchange for shares of Series E Preferred  Stock,  par value $.01 per share,  of
Sheffield (the "Series E Preferred  Stock"),  the rights of which are designated
in the  Certificate of Designations of the Series E Preferred Stock of Sheffield
(the  "Certificate  of  Designations"),  and  pursuant  to a certain  Securities
Purchase Agreement,  dated October 18, 1999 (the "Original Issue Date"), between
Sheffield and Elan International Services, Ltd. (the "Purchase Agreement").  All
Notes issued in exchange for shares of Series E Preferred  Stock,  including the
Interest  Notes,  or upon  transfer or  exchange of other Notes are  referred to
herein as the "Notes."


<PAGE>

All capitalized  terms used in this Note and not otherwise  defined herein shall
have the meaning assigned to such terms in the Certificate of Designations.

The  following is a statement of the rights of the Holder and the  conditions to
which this Note is subject, and to which the Holder hereof, by the acceptance of
this Note, agrees:

         1. Exchange or Replacement of Note.

            (a) The Holder,  at its option,  may in person or by duly authorized
attorney surrender this Note for exchange,  at the office or agency of Sheffield
and  receive in  exchange  therefor a new Note in the same  aggregate  principal
amount as the unpaid principal amount of the Note so surrendered,  each such new
Note to be dated as of the date to which  interest  has been paid on the Note so
surrendered  and  payable  to the  Holder or its  assignee,  as the  Holder  may
designate in writing  (subject to the restrictions on transfer set forth in this
Note and in the Purchase Agreement).

            (b) Upon receipt by Sheffield of evidence  satisfactory to it of the
loss,  theft,  destruction,  or mutilation  of this Note,  and (in case of loss,
theft or  destruction)  of  indemnity  reasonably  satisfactory  to it, and upon
reimbursement to Sheffield of all reasonable expenses  incidental  thereto,  and
upon surrender and cancellation of this Note, if mutilated, Sheffield shall make
and  deliver a new Note of like  tenor in lieu of this  Note.  Any Note made and
delivered in accordance with this paragraph shall be dated the date hereof.

         2. Amendments.  This Note may not be amended, modified or waived in any
respect unless set forth in writing and signed by the Holder, in the case of any
change hereto, including any change in the amount or timing of any payment to be
made hereunder or any adverse change in conversion  rights  hereunder.  Any such
amendment,  modification  or waiver shall be binding upon each future  holder of
this Note.

         3. Costs and Expenses. Sheffield agrees to pay all reasonable costs and
expenses,  including  reasonable  attorneys'  fees,  incurred  by the  Holder in
collecting or enforcing this Note.

         4. No Waivers.  No delay by the Holder in exercising any power or right
hereunder shall operate as a waiver of any power or right,  nor shall any single
or partial  exercise of any power or right  preclude  other or further  exercise
thereof, or the exercise of any other power or right hereunder or otherwise.

         5. Events of Default

         The occurrence of any of the following events shall constitute an event
of default (an "Event of Default"):

            (a) A default in the payment of the  principal  amount of this Note,
when and as the same shall become due and payable;


<PAGE>

            (b) a default in the payment of any  accrued and unpaid  interest on
this Note, when and as the same shall become due and payable;

            (c) a default in the performance,  or a breach of any other covenant
or agreement of  Sheffield  in this Note on any other  Transaction  Document (as
defined in the Purchase  Agreement),  and  continuance of such default or breach
for a  period  of 10  days  after  the  Holder  has  notified  Sheffield  of its
occurrence;

            (d) any representation, warranty, or certification made by Sheffield
pursuant to this Note or any other Transaction Document shall prove to have been
false or misleading as of the date made in any material respect; or

            (e)  (i)  the  entry  of  a  decree  or  order  by  a  court  having
jurisdiction adjudging Sheffield bankrupt or insolvent,  or approving a petition
seeking reorganization,  arrangement, adjustment or composition of or in respect
of Sheffield,  and the  continuance  of any such decree or order unstayed and in
effect  for a  period  of 60 days;  (ii)  the  commencement  by  Sheffield  of a
voluntary  case  under  United  States  bankruptcy  law,  as  now  or  hereafter
constituted,  or the consent by Sheffield to the  institution  of  bankruptcy or
insolvency  proceedings  against it; (iii) the filing by Sheffield of a petition
or answer or  consent  seeking  reorganization  or relief  under  United  States
bankruptcy  law;  (iv) the  appointment  of a  receiver,  liquidator,  assignee,
trustee,  sequestrator,  or similar  official of Sheffield or of any substantial
part of its property which is not  discharged  within 30 days; (v) the making by
Sheffield of an assignment for the benefit of creditors,  or the admission by it
in writing of its  inability  to pay its debts  generally as they become due, or
the taking of corporate action by Sheffield in furtherance of any such action.

         6. Remedies in the Event of Default

            (a) In the case of any Event of Default by Sheffield,  the principal
amount of this Note and accrued and unpaid  interest  thereon shall, in addition
to all other rights and remedies of the Holder  hereunder  and under  applicable
law, be and become immediately due and payable.

            (b)  Sheffield  hereby  waives  grace,  demand and  presentment  for
payment, notice of nonpayment,  protest and notice of protest, diligence, filing
suit,  and all  other  notice  and  promises  to pay the  Holder  its  costs  of
collection of all amounts due hereunder, including reasonable attorneys' fees.

            (c) Upon the occurrence and during the  continuation of any Event of
Default or breach of this Note by Sheffield this Note shall bear interest at the
interest rate otherwise in effect  hereunder plus 3% per annum (but in any event
not in excess of the maximum rate of interest permitted by applicable law).


<PAGE>

         7. Seniority

            This Note shall  constitute  senior  indebtedness of Sheffield,  and
Sheffield shall not incur any  indebtedness  for money borrowed which shall rank
senior  to, or pari  passu  with,  this Note  without  the prior  consent of the
holders of a majority in principal amount of the Notes;  provided,  that nothing
contained  herein shall be construed as to prevent  Sheffield from incurring and
paying  obligations in the ordinary course of business,  in accordance with past
practice.

         8. Miscellaneous

            (a) The  Investor  may assign this Note to its  affiliates  (as such
term is defined in the Securities  Exchange Act of 1934, as amended).  This Note
and all of the provisions  hereof shall be binding upon and inure to the benefit
of the parties hereto and their  respective  successors and assigns,  subject to
compliance by such assignee with the representations and warranties contained in
Section 3(a) of the Purchase Agreement.

            (b) All notices, demands and requests of any kind to be delivered to
the other  party in  connection  with this Note shall be in writing and shall be
deemed  to  have  been  duly  given  if  personally  delivered  or  if  sent  by
nationally-recognized  overnight courier or by registered or certified  airmail,
return receipt requested and postage prepaid, addressed as follows:

                   to Sheffield:

                           Sheffield Pharmaceuticals, Inc.
                           South Winton Court
                           3136 Winton Road South
                           Suite 306
                           Rochester, NY  14623
                           Attention: Chairman

                   and

                           Sheffield Pharmaceuticals, Inc.
                           425 South Woodsmill Road
                           St. Louis, Missouri 63017-3441
                           Attention: Chief Executive Officer

                   with a copy to:

                           Olshan Grundman Frome, Rosenzweig & Wolosky LLP
                           505 Park Avenue
                           New York, NY  10022
                           Attention: Daniel J. Gallagher

<PAGE>

                   to Holder:

                           at the address provided to Sheffield by the Holder.

Each party, by written notice given to the other in accordance with this Section
may change the address to which notices, other communication or documents are to
be sent to such party. All notices,  other  communications or documents shall be
deemed to have been duly given when received.  Any such notice or  communication
shall be deemed to have been received (i) in the case of personal  delivery,  on
the date of such delivery, (ii) in the case of  nationally-recognized  overnight
courier,  on the second  business  day after the date when sent and (iii) in the
case of mailing, on the fifth business day following that day on which the piece
of mail containing such  communication is posted.  Notice hereunder may be given
on behalf of the parties by their respective attorneys.

            (c) This Note shall be governed by and construed in accordance  with
the laws of the  state of New  York,  without  reference  to the  principles  of
conflicts of laws thereof.




<PAGE>
IN WITNESS  WHEREOF,  Sheffield has caused this Note to be issued as of the date
first set forth hereinabove.

                                           SHEFFIELD PHARMACEUTICALS, INC.



                                           By:________________________________
                                              Name:
                                              Title:


<PAGE>
                                                                       Exhibit C

                            FORM OF CONVERSION NOTICE


TO:  Sheffield Pharmaceuticals, Inc.
     Attention: Chief Financial Officer


            The undersigned  owner of shares of Series E Cumulative  Convertible
Preferred  Stock,  par value $.01 per share  (the  "Series E  Preferred  Stock")
issued by Sheffield Pharmaceuticals, Inc. (the "Corporation") hereby irrevocably
exercises  its option to  convert  __________  shares of the Series E  Preferred
Stock  into  shares of the common  stock,  $.01 par  value,  of the  Corporation
("Common   Stock"),   in  accordance  with  the  terms  of  the  Certificate  of
Designations of the Series E Preferred Stock.  The undersigned  hereby instructs
the  Corporation to convert the number of shares of the Series E Preferred Stock
specified above into shares of Common Stock in accordance with the provisions of
Article 6 of such Certificate of Designations.  The undersigned directs that the
Common Stock issuable and certificates therefor deliverable upon conversion, the
Series E Preferred  Stock  recertificated,  if any,  not being  surrendered  for
conversion  hereby,  together  with any check in payment for  fractional  Common
Stock,  be  issued  in the name of and  delivered  to the  undersigned  unless a
different  name has been indicated  below.  All  capitalized  terms used and not
defined herein have the respective meanings assigned to them in such Certificate
of Designations.


Dated:__________________

                                             --------------------------------


                                             by:_____________________________
                                                Name:
                                                Title:


             Fill in for registration of Series E Preferred Stock:

Please print name and address
(including zip code number):

- --------------------------
- --------------------------
- --------------------------
- --------------------------

                          CERTIFICATE OF DESIGNATIONS,
                             PREFERENCES AND RIGHTS

                                       OF

                      SERIES F CONVERTIBLE NON-EXCHANGEABLE

                                 PREFERRED STOCK

                                       OF

                         SHEFFIELD PHARMACEUTICALS, INC.

                                 ---------------

                           Pursuant to Section 151 of
              the General Corporation Law of the State of Delaware




            Sheffield   Pharmaceuticals,   Inc.,  a  corporation  organized  and
existing  under  the  General  Corporation  Law of the  State of  Delaware  (the
"Corporation"),  hereby  certifies  that the  following  resolutions  were  duly
adopted by the Board of  Directors of the  Corporation  at a meeting duly called
and held on October 15, 1999  pursuant to authority of the Board of Directors as
required by Section 151 of the General Corporation Law of the State of Delaware:

            RESOLVED,  that pursuant to the authority  expressly  granted to and
vested in the Board of Directors of the  Corporation  (the "Board" or the "Board
of  Directors") by the provisions of the  Certificate  of  Incorporation  of the
Corporation (the "Certificate of Incorporation"), out of the 3,000,000 shares of
preferred  stock  of  the  Corporation  authorized  in  Article  FOURTH  of  the
Certificate of Incorporation (the "Preferred Stock"),  there hereby is created a
series of Preferred  Stock  consisting of 5,000 shares,  which series shall have
the following  powers,  designations,  preferences and relative,  participating,
optional or other rights,  and the  following  qualifications,  limitations  and
restrictions  (in  addition  to  the  powers,  designations,   rights,  and  the
qualifications,  limitations and  restrictions,  set forth in the Certificate of
Incorporation which are applicable to the Preferred Stock).



<PAGE>
                                    ARTICLE 1
                             DESIGNATION AND AMOUNT

            The  shares  of  such  series  shall  be  designated  as  "Series  F
Convertible  Non-Exchangeable  Preferred Stock" (the "Series F Preferred Stock")
and the  authorized  number of shares  constituting  such series  shall be 5,000
shares.  The par value of the Series F Preferred  Stock shall be $.01 per share.
The stated value of the Series F Preferred  Stock shall be One Thousand  Dollars
($1,000) per share (the "Stated Value").


                                    ARTICLE 2
                                   DEFINITIONS

            The terms defined in this Article  whenever used in this Certificate
of Designations have the following respective meanings:

               (a) "AMEX" means the American Stock Exchange.

               (b) "Business Day" means a day other than Saturday, Sunday or any
day on which banks located in the State of New York are  authorized or obligated
to close.

               (c)  "Common  Shares" or "Common  Stock"  means  shares of common
stock, $.01 par value, of the Corporation.

               (d)  "Conversion  Date" means any day on which all or any portion
of shares of the Series F Preferred  Stock is converted in  accordance  with the
provisions hereof.

               (e) "Conversion Notice" has the meaning set forth in Section 6.1.

               (f) "Conversion Price" has the meaning set forth in Section 6.1.

               (g)  "Corporation"  means  Sheffield  Pharmaceuticals,   Inc.,  a
Delaware  corporation,  and any  successor  or resulting  corporation  by way of
merger,  consolidation,  sale or  exchange  of all or  substantially  all of the
Corporation's assets, or otherwise.

                                      -2-

<PAGE>
               (h) "Current Market Price" on any date of determination means the
closing price of a Common Share on such day as reported on the AMEX, or, if such
security  is not listed or  admitted  to trading on the AMEX,  on the  principal
national  security exchange or quotation system on which such security is quoted
or listed or  admitted  to  trading,  or, if not quoted or listed or admitted to
trading on any national  securities exchange or quotation system, the average of
the closing bid and ask prices of such security on the  over-the-counter  market
on  the  day  in  question  as  reported  by  the  National   Quotation   Bureau
Incorporated,  or a similar generally accepted  reporting service,  or if not so
available, in such manner as furnished by any Nasdaq member firm of the National
Association of Securities Dealers,  Inc. selected from time to time by the Board
of Directors of the Corporation for that purpose,  or a price determined in good
faith by the Board of  Directors of the  Corporation  as being equal to the fair
market value thereof, as the case may be.

               (i)  "Dollars"  or "$" means  currency  of the  United  States of
America.

               (j)  "Holder" or  "Holders"  means Elan  International  Services,
Ltd., a Bermuda corporation, any successor thereto, or any Person(s) to whom the
Series F Preferred  Stock is  subsequently  transferred  in accordance  with the
provisions hereof.

               (k)  "Issue  Date"  means the date of  original  issuance  of the
applicable share of Series F Preferred Stock.

               (l) "Junior Securities" has the meaning set forth in Article 3.

               (m) "Liquidation Preference" has the meaning set forth in Section
5.1(b).

               (n) "Original Holder" means Elan International  Services,  Ltd, a
Bermuda  exempted  limited  liability  company  incorporated  under  the laws of
Bermuda  and its  affiliates  (as that  term is  defined  under  the  Securities
Exchange Act of 1934, as amended).

               (o) "Original Issue Date" means the date of the initial  issuance
of shares of Series F Preferred Stock.

               (p) "Pari Passu  Securities" has the meaning set forth in Article
3.

               (q) "Person" means an individual,  a corporation,  a partnership,
an  association,   a  limited  liability  company,  a  unincorporated   business
organization,  a trust or other entity or  organization,  and any  government or
political subdivision or any agency or instrumentality thereof.

               (r) "Rights" has the meaning set forth in Section 6.2(e).

               (s) "Securities Purchase Agreement" means the Securities Purchase
Agreement,  dated as of October  18,  1999,  between  the  Corporation  and Elan
International Services, Ltd.

               (t) "Stated Value" has the meaning set forth in Article 1.

                                      -3-

<PAGE>
               (u) "Trading  Day" means any day on which  purchases and sales of
securities  authorized for quotation on the AMEX are reported thereon or, if the
Common  Stock is not listed or admitted  to trading on the AMEX,  a day on which
the principal national  securities  exchange on which the Common Stock is listed
or  admitted  to trading is open for the  transaction  of  business,  or, if the
Common Stock is not so listed or admitted to trading on any national  securities
exchange,  a day on which the Nasdaq National Market (or any successor  thereto)
or such other system then in use is open for the transaction of business, or, if
the Common  Stock is not quoted by any such  organization,  any day other than a
Saturday, Sunday or a day on which banking institutions in the State of New York
are authorized or obligated by law or executive order to close.


                                    ARTICLE 3
                                      RANK

               The Series F  Preferred  Stock shall rank (i) prior to the Common
Stock;  (ii)  prior to any class or series of capital  stock of the  Corporation
hereafter  created  other than Pari  Passu  Securities  (collectively,  with the
Common Stock, the "Junior Securities");  (iii) pari passu with the Corporation's
Series C  Cumulative  Convertible  Preferred  Stock  (the  "Series  C  Preferred
Stock");   (iv)  pari  passu  with  the   Corporation's   Series  E  Convertible
Non-Exchangeable  Preferred  Stock (the  "Series E Preferred  Stock");  (v) pari
passu with the Corporation's Series D Convertible  Exchangeable  Preferred Stock
(the "Series D Preferred  Stock");  and (vi) pari passu with any class or series
of capital stock of the Corporation  hereafter created  specifically  ranking on
parity  with the  Series F  Preferred  Stock  (collectively,  with the  Series C
Preferred  Stock, the Series E Preferred Stock and the Series D Preferred Stock,
the "Pari Passu Securities").


                                    ARTICLE 4
                                    DIVIDENDS

         SECTION 4.1

               (a)  Subject  to  Article  6, the  Holder  shall be  entitled  to
receive, out of funds legally available for the payment of dividends,  dividends
on a pari passu basis with the holders of Common Stock.  No interest,  or sum of
money in lieu of interest,  shall be payable in respect of any dividend  payment
or payments on the Series F Preferred Stock that may be in arrears.

               (b) No dividends or distributions may be paid with respect to the
Common Stock, and the Company shall not repurchase,  redeem or otherwise acquire
any Common Stock, unless such dividends,  distribution or repurchase, redemption
or  acquisition  payment  are paid on a pro rata  basis to  holders  of Series F
Preferred  Stock,  on an as converted  basis, at the same time and upon the same
terms as such payments with respect to the Common Stock.

                                    ARTICLE 5
                             LIQUIDATION PREFERENCE

         SECTION 5.1

               (a) If the Corporation  shall commence a voluntary case under the
Federal  bankruptcy laws or any other  applicable  Federal or State  bankruptcy,
insolvency  or similar law, or consent to the entry of an order for relief in an


<PAGE>

involuntary case under any law or to the appointment of a receiver,  liquidator,
assignee,  custodian,  trustee,  sequestrator (or other similar official) of the
Corporation or of any  substantial  part of its property,  or make an assignment
for the benefit of its  creditors,  or admit in writing its inability to pay its
debts  generally  as they  become  due,  or if a decree or order  for  relief in
respect of the  Corporation  shall be entered by a court having  jurisdiction in
the premises in an  involuntary  case under the Federal  bankruptcy  laws or any
other  applicable  Federal  or  state  bankruptcy,  insolvency  or  similar  law
resulting in the  appointment of a receiver,  liquidator,  assignee,  custodian,
trustee,  sequestrator (or other similar  official) of the Corporation or of any
substantial  part of its property,  or ordering the winding up or liquidation of
its affairs,  and any such decree or order shall be unstayed and in effect for a
period of ninety (90)  consecutive  days and, on account of any such event,  the
Corporation  shall liquidate,  dissolve or wind up, or if the Corporation  shall
otherwise  liquidate,  dissolve or wind up (each such event being  considered  a
"Liquidation Event"), no distribution shall be made to the holders of any Junior
Securities of the Corporation upon liquidation, dissolution or winding up unless
prior  thereto,  the  Holders,  subject to Article  5, shall have  received  the
Liquidation  Preference  (as  defined in Article  5.1(b))  with  respect to each
share.  If upon the  occurrence  of a  Liquidation  Event,  the assets and funds
available for distribution among the Holders and holders of shares of Pari Passu
Securities  shall be  insufficient  to permit the payment to such holders of the
preferential  amounts payable  thereon,  then the entire assets and funds of the
Corporation  legally  available for distribution to the Series F Preferred Stock
and the Pari Passu Securities shall be distributed  ratably among such shares in
proportion to the ratio that the preferential amounts payable on each such share
bears to the aggregate preferential amounts payable on all such shares.

               (b)  For  purposes  hereof,  the  "Liquidation  Preference"  with
respect to a share of the Series F Preferred Stock shall mean an amount equal to
the Stated Value thereof plus the aggregate of all accrued and unpaid  dividends
on such share of Series F Preferred Stock.


                                    ARTICLE 6
                     CONVERSION OF SERIES F PREFERRED STOCK

        SECTION 6.1  Conversion.

               (a) Holders of shares of the Series F Preferred  Stock shall have
the right,  exercisable at any time after the second anniversary of the Original
Issue Date and prior to the sixth  anniversary  of the Original  Issue Date,  to
convert all or any such  shares of the Series F Preferred  Stock into the number
of shares of Common  Stock  (calculated  as to each  conversion  to the  nearest
1/100th  of a  share)  determined  by  dividing  (1) the  aggregate  Liquidation
Preference  of the shares of Series F  Preferred  Stock to be  converted  by (2)
$3.40 (the "Conversion Price").

               (b) Any  holder of a share or shares  of the  Series F  Preferred
Stock  electing  to  convert  such share or shares  thereof  shall  deliver  the
certificate or certificates  therefor to the principal office of the Corporation
or any transfer agent for the Common Stock,  with the form of notice of election
to  convert  attached  as Exhibit A to this  Certificate  of  Designations  (the
                                      -5-

<PAGE>

"Conversion Notice"), fully completed and duly executed and (if such required by
the Corporation or any conversion agent)  accompanied by instruments of transfer
in form  satisfactory  to the  Corporation  and to any  conversion  agent,  duly
executed  by  the  registered  Holder  of  his  duly  authorized  attorney.  The
conversion  right with  respect to any such shares  shall be deemed to have been
exercised at the date upon which the certificates  therefore accompanied by such
duly  executed  notice of election and  instruments  of transfer and such taxes,
stamps,  funds,  or evidence of payment  shall have been so  delivered,  and the
Person or Persons  entitled to receive the shares of the Common  Stock  issuable
upon such  conversion  shall be treated for all purposes as the record Holder or
Holders of such shares of the Common Stock upon said date.

               (c) From and  after  the  delivery  of the  Conversion  Notice in
respect of any conversion of shares of Series F Preferred Stock, all such shares
of Series F Preferred  Stock shall be deemed to have been  converted into shares
of  Common  Stock  as of  the  applicable  Conversion  Date  at  the  applicable
conversion  rate,  all stock  dividends on such shares of the Series F Preferred
Stock shall cease to accrue, and all rights of the Holders thereof as holders of
Series F  Preferred  Stock,  except the right to receive  all accrued and unpaid
stock  dividends to such  Conversion Date at the applicable rate for such shares
of Series F Preferred Stock and the right to receive  certificates  representing
shares of Common Stock issuable upon the  conversion of such shares  (including,
without limitation, with respect to such stock dividends, as applicable),  shall
cease  and  terminate,  such  shares  of  Series F  Preferred  Stock  shall  not
thereafter be transferred  (except with the consent of the Corporation) and such
shares shall not be deemed to be outstanding for any purpose whatsoever.

               (d)  No   fractional   shares  of  the  Common   Stock  or  scrip
representing  fractional shares shall be issued upon conversion of shares of the
Series F Preferred Stock. If more than one share of the Series F Preferred Stock
shall be surrendered  for conversion at one time by the same holder,  the number
of full  shares of the Common  Stock which  shall be  issuable  upon  conversion
thereof shall be computed on the basis of the aggregate  number of shares of the
Series F Preferred Stock so surrendered. Instead of any fractional shares of the
Common Stock which would  otherwise be issuable upon conversion of any shares of
the Series F Preferred  Stock,  the  Corporation  shall pay a cash adjustment in
respect of such  fraction in an amount equal to the same fraction of the Current
Market  Price  for the  Common  Stock  on the last  Trading  Day  preceding  the
applicable date of conversion.

               (e) Each  Conversion  Notice under this Section 6.1 shall request
the  conversion  of at least  500  shares  of  Series F  Preferred  Stock or the
remaining  balance of Series F Preferred  Stock held by the  converting  Holder,
whichever is less.

         SECTION 6.2 Adjustments.  The Conversion Price and the number of shares
issuable  upon  conversion  of the  Series F  Preferred  Stock  are  subject  to
adjustment from time to time as follows:

               (a)  Merger,  Sale of  Assets,  Etc.  Notwithstanding  any  other
limitation  whatsoever  contained  herein,  if at any time  while  the  Series F
Preferred  Stock, or any portion  thereof,  is outstanding  there shall be (i) a
reorganization  (other  than  a  combination,   reclassification,   exchange  or

                                      -6-
<PAGE>

subdivision  of  shares  otherwise  provided  for  herein),  (ii)  a  merger  or
consolidation of the Corporation  with or into another  corporation in which the
Corporation is the surviving entity but the shares of the Corporation's  capital
stock outstanding immediately prior to the merger are converted by virtue of the
merger  into  other  property,  whether  in the  form  of  securities,  cash  or
otherwise,  or (iii) a sale or  transfer  of the  Corporation's  properties  and
assets as, or substantially as, an entirety to any other Person,  then as a part
of such reorganization, merger, consolidation, sale or transfer lawful provision
shall be made so that the Holder  shall  thereafter  be entitled to receive upon
conversion of the Series F Preferred Stock,  during the period specified herein,
the number of shares of stock or other  securities  or property of the successor
corporation resulting from such reorganization,  merger, consolidation,  sale or
transfer   that  the  Holder  would  have  been  entitled  to  receive  in  such
reorganization,  consolidation,  merger,  sale  or  transfer  if  the  Series  F
Preferred  Stock had been  converted  immediately  before  such  reorganization,
merger,  consolidation,  sale or transfer,  all subject to further adjustment as
provided in this Section 6.2(a). The foregoing provisions of this Section 6.2(a)
shall similarly apply to successive reclassification,  changes,  consolidations,
mergers,  mandatory  share  exchanges and sales and transfers.  If the per share
consideration  payable to the holder  hereof for shares in  connection  with any
such transaction is in a form other than cash or marketable securities, then the
value of such  consideration  shall be  determined in good faith by the Board of
Directors. In all events, appropriate adjustment (as determined in good faith by
the Board of Directors)  shall be made in the  application  of the provisions of
this Certificate of Designations with respect to the rights and interests of the
Holder after the transaction, to the end that the provisions of this Certificate
of Designations  shall be applicable after that event, as near as reasonably may
be, in relation  to any shares or other  property  deliverable  after that event
upon conversion of the Series F Preferred Stock.

               (b) Reclassification,  Etc. If the Corporation, at any time while
the Series F Preferred Stock, or any portion thereof, remains outstanding, shall
change  any  of  the  securities  as  to  which  conversion  rights  under  this
Certificate  of  Designations  exist  into the  same or a  different  number  of
securities  of any other  class or classes,  the Series F Preferred  Stock shall
thereafter  represent the right to acquire such number and kind of securities as
would  have been  issuable  as the  result of such  change  with  respect to the
securities that were subject to the conversion  rights under this Certificate of
Designations  immediately prior to such reclassification or other change and the
Conversion  Price  therefor  shall be  appropriately  adjusted,  all  subject to
further adjustment as provided in this Certificate of Designations.

               (c)  Split,   Subdivision  or  Combination  of  Shares.   If  the
Corporation  at any time  while the Series F  Preferred  Stock,  or any  portion
thereof, remains outstanding shall split, subdivide or combine the securities as
to which conversion rights under this Certificate of Designations  exist, into a
different  number of securities of the same class, the Conversion Price shall be
proportionately   decreased   in  the  case  of  a  split  or   subdivision   or
proportionately increased in the case of a combination.

               (d)  Adjustments  for Dividends in Stock and Other  Securities or
Property. If while the Series F Preferred Stock, or any portion hereof,  remains
outstanding,  the holders of the securities as to which conversion  rights under
this Certificate of Designations  exist at the time shall have received,  or, on
                                      -7-

<PAGE>

or after the record date fixed for the determination of eligible stockholders of
the  Corporation,  shall  have  become  entitled  to  receive,  without  payment
therefor,  other or additional stock or other securities or property (other than
cash) of the Corporation by way of dividend, then and in each case, the Series F
Preferred  Stock shall  represent  the right to  acquire,  upon  conversion,  in
addition to the number of shares of the security  receivable  upon conversion of
the  Series  F  Preferred   Stock,   and  without   payment  of  any  additional
consideration  therefor,  the amount of such other or additional  stock or other
securities  or  property  (other than cash) of the  Corporation  that the Holder
would  hold on the date of such  conversion  had it been the holder of record of
the security  receivable  upon conversion of the Series F Preferred Stock on the
date  hereof and had  thereafter,  during the period from the date hereof to and
including the date of such  conversion,  retained such shares and/or  additional
stock  available by it as aforesaid  during such  period,  giving  effect to all
adjustments called for during such period by the provisions of this Section 6.2.

               (e) Repurchases or Redemptions of Common Stock or Options. If the
Corporation  at  any  time  while  shares  of  Series  F  Preferred   Stock  are
outstanding,  shall repurchase or redeem any outstanding  shares of Common Stock
or rights,  options or warrants granting the holder thereof the right to acquire
shares of Common Stock (collectively, the "Rights") in a single transaction or a
series of related  transactions  involving an aggregate repurchase or redemption
price in excess of $500,000 at a price (on a per share  basis)  which is greater
than 150% of the Current Market Price as of the day prior to such  repurchase or
redemption,  the Conversion Price shall thereupon be adjusted by multiplying the
Conversion  Price in effect  immediately  prior to the applicable  repurchase or
redemption  by a fraction  (i) the  numerator  of which shall be the  Conversion
Price in effect  immediately prior to such repurchase or redemption and (ii) the
denominator of which shall be the fair market value of the consideration paid by
the  Corporation  for each share of Common  Stock (or each share of Common Stock
issuable upon exercise of the Right(s) subject to such repurchase or redemption)
in such repurchase or redemption.

               (f)  Certificate as to  Adjustments.  Upon the occurrence of each
adjustment or readjustment  pursuant to this Section 6.2, the Corporation at its
expense shall promptly  compute such  adjustment or  readjustment  in accordance
with the terms hereof and furnish to the Holder a certificate setting forth such
adjustment  or  readjustment  and  showing  in detail  the facts upon which such
adjustment or readjustment is based.

               (g) Cumulative Adjustments. No adjustment in the Conversion Price
shall be required until cumulative adjustments result in a concomitant change of
1% or more of the Conversion  Price as in effect prior to the last adjustment of
the Conversion Price; provided, however, that any adjustments which by reason of
this Section 6.2 are not required to be made shall be carried  forward and taken
into account in any subsequent  adjustment.  All calculations under this Section
6.2  shall be made to the  nearest  cent or to the  nearest  one-hundredth  of a
share,  as the case may be. No adjustment to the Conversion  Price shall be made
for cash dividends.

                                      -8-

<PAGE>
                                    ARTICLE 7
                                  VOTING RIGHTS

          The  holders  of the  Series F  Preferred  Stock  shall have no voting
rights, except as otherwise provided by the General Corporation Law of the State
of Delaware ("DGCL") and in this Article 7, and in Article 8 below.

          The Corporation  shall provide each Holder of Series F Preferred Stock
with prior  notification  of any meeting of the  shareholders of the Corporation
(and copies of proxy materials and other information sent to  shareholders).  In
the event of any taking by the Corporation of a record of its  shareholders  for
the purpose of determining  shareholders  who are entitled to receive payment of
any  dividend or other  distribution,  any right to subscribe  for,  purchase or
otherwise   acquire   (including   by   way   of   merger,    consolidation   or
recapitalization) any share of any class or any other securities or property, or
to receive any other right, or for the purpose of determining  shareholders  who
are entitled to vote in connection with any proposed liquidation, dissolution or
winding  up of the  Corporation,  the  Corporation  shall  mail a notice to each
Holder,  at least thirty (30) days prior to the  consummation of the transaction
or event,  whichever is earlier),  of the date on which any such action is to be
taken for the purpose of such dividend,  distribution, right or other event, and
a  brief  statement  regarding  the  amount  and  character  of  such  dividend,
distribution, right or other event to the extent known at such time.

          To the  extent  that  under  the DGCL the vote of the  Holders  of the
Series F Preferred Stock,  voting separately as a class or series as applicable,
is required to authorize a given action of the Corporation, the affirmative vote
or consent of the  Holders of at least a majority  of the shares of the Series F
Preferred Stock  represented at a duly held meeting at which a quorum is present
or by written  consent of a majority of the shares of Series F  Preferred  Stock
(except as  otherwise  may be  required  under the DGCL)  shall  constitute  the
approval of such action by the class.  To the extent that under the DGCL Holders
of the Series F Preferred Stock are entitled to vote on a matter with Holders of
Common  Stock,  voting  together as one class,  each share of Series F Preferred
Stock  shall be  entitled  to a number of votes equal to the number of shares of
Common  Stock into which such shares are  convertible  as of the record date for
the taking of such vote of shareholders. Holders of the Series F Preferred Stock
shall be entitled to notice of all shareholder meetings or written consents (and
copies of proxy  materials  and other  information  sent to  shareholders)  with
respect to which they would be entitled as of right under the DGCL, which notice
would be provided pursuant to the Corporation's bylaws and the DGCL.

                                    ARTICLE 8
                              PROTECTIVE PROVISIONS

          So long as shares of Series F  Preferred  Stock are  outstanding,  the
Corporation  shall not, without first obtaining the approval (by vote or written
consent,  as  provided by the DGCL) of the Holders of at least a majority of the
then outstanding shares of Series F Preferred Stock:

               (a)  create  any new class or series of  capital  stock  having a
preference superior to the Series F Preferred Stock as to distribution of assets
upon  liquidation,  dissolution  or  winding  up  of  the  Corporation  ("Senior


                                      -9-
<PAGE>

Securities")  or alter or change the rights,  preferences  or  privileges of any
Senior Securities so as to affect adversely the Series F Preferred Stock; or

            (b) amend or alter  whether by merger,  consolidation  or otherwise,
any of the  provisions  of the  Certificate  of  Incorporation  (including  this
Certificate  of  Designations)  that  would  change the  preferences,  rights or
privileges  with  respect  to the Series F  Preferred  Stock so as to affect the
Series F Preferred Stock adversely.

          In the event  holders of at least a majority  of the then  outstanding
shares of Series F Preferred  Stock agree to allow the  Corporation  to amend or
alter the preferences,  rights or privileges of the shares of Series F Preferred
Stock,  pursuant to subsection (b) above, so as to affect adversely the Series F
Preferred  Stock,  then the  Corporation  will deliver  notice of such  approved
change to the Holders of the Series F Preferred Stock that did not agree to such
amendment or change (the "Dissenting  Holders") and the Dissenting Holders shall
have the right for a period of thirty  (30) days to convert  pursuant to Section
6.1 of this  Certificate of  Designations as they exist prior to such alteration
or  continue  to hold their  shares of Series F Preferred  Stock.  The  Holders'
rights under this  Article 8 shall  terminate  on the sixth  anniversary  of the
Original Issue Date.


                                    ARTICLE 9
                                  MISCELLANEOUS

         SECTION 9.1 Loss, Theft,  Destruction of Series F Preferred Stock. Upon
receipt  of  evidence  satisfactory  to  the  Corporation  of the  loss,  theft,
destruction or mutilation of shares of Series F Preferred Stock and, in the case
of any such loss,  theft or  destruction,  upon receipt of indemnity or security
reasonably  satisfactory  to the  Corporation,  or,  in  the  case  of any  such
mutilation, upon surrender and cancellation of the Series F Preferred Stock, the
Corporation  shall  make,  issue  and  deliver,  in lieu of such  lost,  stolen,
destroyed or mutilated  shares of Series F Preferred Stock, new shares of Series
F Preferred Stock of like date and tenor.

         SECTION 9.2 Who Deemed  Absolute  Owner.  The  Corporation may deem the
Person in whose name the Series F Preferred  Stock shall be registered  upon the
registry books of the Corporation to be, and may treat it as, the absolute owner
of the  Series F  Preferred  Stock  for the  purpose  of  receiving  payment  of
dividends on the Series F Preferred  Stock,  for the  conversion of the Series F
Preferred  Stock and for all other purposes,  and the  Corporation  shall not be
affected by any notice to the contrary.  All such  payments and such  conversion
shall be valid and effectual to satisfy and  discharge  the  liability  upon the
Series  F  Preferred  Stock  to the  extent  of the  sum or  sums so paid or the
conversion so made.

         SECTION  9.3  Register.  The  Corporation  shall keep at its  principal
office a register in which the Corporation shall provide for the registration of
the Series F Preferred Stock.  Upon any transfer of the Series F Preferred Stock
in accordance with the provisions  hereof,  the Corporation  shall register such
transfer on the Series F Preferred Stock register.

                                      -10-
<PAGE>
         SECTION 6.4 Withholding.  To the extent required by applicable law, the
Corporation  may  withhold  amounts  for or on account  of any taxes  imposed or
levied by or on behalf of any  taxing  authority  in the  United  States  having
jurisdiction  over the Corporation from any payments made pursuant to the Series
F Preferred Stock.

         SECTION 6.5 Headings. The headings of the Articles and Sections of this
Certificate  of  Designations  are  inserted  for  convenience  only  and do not
constitute a part of this Certificate of Designations.








                                      -11-

<PAGE>
IN WITNESS WHEREOF, the Corporation has caused this Certificate of Designations,
Preferences  and Rights to be signed by Loren G.  Peterson,  its  President  and
Chief Executive Officer,  and attested by Scott A. Hoffmann,  its Secretary,  on
this 18th day of October, 1999.

                                       SHEFFIELD PHARMACEUTICALS, INC.




                                        By:/s/ Loren G. Peterson
                                           -------------------------------------
                                          Loren G. Peterson
                                          President and Chief Executive Officer


Attested:


By:  /s/ Scott A. Hoffman
     -----------------------
     Scott A. Hoffmann
     Secretary


<PAGE>

                                                                       Exhibit C

                            FORM OF CONVERSION NOTICE


TO:  Sheffield Pharmaceuticals, Inc.
     Attention: Chief Financial Officer


            The   undersigned   owner  of  shares   of   Series  F   Convertible
Non-Exchangeable  Preferred  Stock,  par  value  $.01 per share  (the  "Series F
Preferred Stock") issued by Sheffield Pharmaceuticals,  Inc. (the "Corporation")
hereby  irrevocably  exercises  its option to convert  __________  shares of the
Series F Preferred Stock into shares of the common stock, $.01 par value, of the
Corporation ("Common Stock"), in accordance with the terms of the Certificate of
Designations of the Series F Preferred Stock.  The undersigned  hereby instructs
the  Corporation to convert the number of shares of the Series F Preferred Stock
specified above into shares of Common Stock in accordance with the provisions of
Article 6 of such Certificate of Designations.  The undersigned directs that the
Common Stock issuable and certificates therefor deliverable upon conversion, the
Series F Preferred  Stock  recertificated,  if any,  not being  surrendered  for
conversion  hereby,  together  with any check in payment for  fractional  Common
Stock,  be  issued  in the name of and  delivered  to the  undersigned  unless a
different  name has been indicated  below.  All  capitalized  terms used and not
defined herein have the respective meanings assigned to them in such Certificate
of Designations.


Dated: _________________

                                          --------------------------------


                                          by:_____________________________
                                             Name:
                                             Title:


          Fill in for registration of Series F Preferred Stock:

Please print name and address
(including zip code number) :

- --------------------------
- --------------------------
- --------------------------

                          SECURITIES PURCHASE AGREEMENT


SECURITIES  PURCHASE  AGREEMENT,  dated as of  October  18,  1999  between  Elan
International  Services,  Ltd., a Bermuda  exempted  limited  liability  company
incorporated under the laws of Bermuda ("EIS"),  and Sheffield  Pharmaceuticals,
Inc., a Delaware corporation (the "Company").


                                R E C I T A L S:

                  A.  The  Company  desires  to issue  and sell to EIS,  and EIS
desires to purchase from the Company, for aggregate consideration of $12,015,000
(the "Original Series D Issue Price"),  12,015 shares of a newly-created  series
of cumulative  convertible  exchangeable  preferred  stock,  par value $0.01 per
share, of the Company (the "Series D Preferred Stock"), which shall be issued to
EIS pursuant to a Certificate  of  Designations  in the form attached  hereto as
Exhibit A (the "Series D Certificate of Designations"),  at a per share purchase
price of $1,000.

                  B.  The  Company  desires  to issue  and sell to EIS,  and EIS
desires to purchase from the Company, for aggregate consideration that shall not
exceed $4,005,000 (the "Original Series E Issue Price"), up to 4,005 shares of a
newly-created series of cumulative convertible non-exchangeable preferred stock,
par value $0.01 per share,  of the  Company  (the  "Series E Preferred  Stock"),
which,  if  issued,  shall  be  issued  to  EIS  pursuant  to a  Certificate  of
Designations in the form attached hereto as Exhibit B (the "Series E Certificate
of Designations"), at a per share purchase price of $1,000.

                  C.  The  Company  desires  to issue  and sell to EIS,  and EIS
desires to purchase from the Company, for aggregate  consideration of $5,000,000
(the  "Original  Series F Issue  Price"),  (i) 5,000  shares of a  newly-created
series of the Company's convertible, non-exchangeable preferred stock, par value
$0.01 per share, of the Company (the "Series F Preferred Stock"), which shall be
issued to EIS pursuant to a  Certificate  of  Designations  in the form attached
hereto as Exhibit C (the "Series F Certificate  of  Designations",  and together
with the Series D Certificate  of  Designations  and the Series E Certificate of
Designations,  the "Certificates of Designations") and (ii) a warrant to acquire
150,000 shares (subject to adjustment) of the common stock,  par value $0.01 per
share,  of the Company (the "Sheffield  Common Stock"),  at an exercise price of
$6.00 per share,  pursuant to a warrant  certificate in the form attached hereto
as Exhibit D (the "Warrant", and together with the Series D Preferred Stock, the
Series  E  Preferred  Stock  and  the  Series  F  Preferred,  collectively,  the
"Securities").

                  D. The Company has  previously  caused to be formed  Sheffield
Newco, Ltd., a Bermuda exempted limited liability company incorporated under the
laws of Bermuda ("Newco"). The Company will acquire from Newco, for an aggregate
purchase price of $12,015,000,  (i) 12,000 shares of Newco's voting common stock
(the "Newco Common Stock"),  representing 100% of the outstanding shares of such
class of  stock,  and (ii)  7,224  shares  of  Newco's  non-voting,  convertible
preferred stock (the "Newco Preferred Stock"),  representing, on a fully diluted
basis,  30.1% of the outstanding shares of such class of stock. EIS will acquire
from Newco, for an aggregate purchase price of $2,985,000, 4,776 shares of Newco
Preferred  Stock,  representing,   on  a  fully  diluted  basis,  19.9%  of  the
outstanding  shares of such  class of  stock.  Newco has  entered  into  license
arrangements  (the  "License   Arrangements")  with  Elan  Pharma  International
Limited, an Irish private company ("EPIL"), and with the Company for the purpose
of developing and  commercializing  certain medical products as set forth in the
documents that evidence the License Arrangements.


<PAGE>
                  E. The parties  intend,  as provided  herein,  that all of the
proceeds  from the sale of (i) the Series D Preferred  Stock shall be applied by
the Company  solely to fund the Company's  initial  investment in Newco and (ii)
the Series E Preferred  Stock shall be applied by the Company solely to fund the
Company's  subsequent  development funding obligations in connection with Newco,
in each case,  as provided  herein and as set forth in the  Subscription,  Joint
Development and Operating Agreement, dated as of the date hereof, by and between
Newco, Elan Pharma International  Limited, EIS and the Company (the "Development
Agreement").

                  F. The Company and EIS are  executing  and  delivering  on the
date hereof a Registration Rights Agreement (the "Sheffield  Registration Rights
Agreements") in respect of the purchase of the Series D Preferred Stock,  Series
E Preferred  Stock,  Series F Preferred  Stock and the  Sheffield  Common  Stock
underlying  the  Securities  and any other  shares of  Sheffield  capital  stock
(including  shares of  preferred  stock  issued as  dividends  upon the Series D
Preferred Stock or Series E Preferred  Stock) that may, at any time, be acquired
or owned by EIS or its affiliates.

                  G. The Company,  EIS and Newco are executing and delivering on
the date hereof a Registration  Rights Agreement (the "Newco Registration Rights
Agreements"),  in  respect  of the  purchase  of Newco  Common  Stock  and Newco
Preferred  Stock by the Company and EIS. This  Agreement,  the  Securities,  the
Certificates  of  Designations,   the  Development   Agreement,   the  Sheffield
Registration Rights Agreements,  the Newco Registration  Rights Agreements,  the
Dividend Notes (as defined below) and each other document,  promissory  notes or
instrument  executed  and  delivered,   or  to  be  executed  and  delivered  as
contemplated hereby or thereby, in connection with the transactions contemplated
hereby, (the "Transaction Documents").

                               A G R E E M E N T:

         The parties agree as follows:

                  SECTION 1.  Closings.  (a) Time and Place.  The closing of the
transactions  contemplated hereby (the "Closing") shall occur on the date hereof
(the "Closing Date") at such place as the parties may agree.

                  (b) Issuance of  Securities.  At the Closing,  (x) the Company
shall issue and sell to EIS, and EIS shall  purchase from the Company (i) 12,015
shares  of  Series  D  Preferred  Stock  for  an  aggregate  purchase  price  of
$12,015,000  and (ii) 5,000  shares of Series F Preferred  Stock and the Warrant
for an aggregate purchase price of $4,397,500 and the surrender and cancellation
of the Promissory Note,  dated September 30, 1999,  issued by the Company to EIS
in the principal amount of $600,000.

                  (c) Delivery. At the Closing, EIS shall pay the purchase price
for the Series D Preferred  Stock,  the Series F Preferred Stock and the Warrant
by wire  transfer  to an account or accounts  designated  by the Company and the
parties  hereto shall execute and deliver to each other,  as  applicable:  (i) a
certificate or certificates for the shares of Series D Preferred Stock; (ii) the
Warrant;  (iii) a  certificate  or  certificates  for the shares of the Series F
Preferred  Stock;  (iv)  certificates  as to  the  incumbency  of  the  officers
executing  this  Agreement;  and (v) each of the other  documents or instruments
executed in connection herewith.  In addition, at the Closing, the Company shall
cause to be  delivered  to EIS an  opinion  of  counsel  in form  and  substance
satisfactory to EIS.

                  (d) Additional  Closings - Series E Preferred Stock. EIS shall
be obligated, subject to the conditions set forth in Section 6, during the first
36 months  immediately  after the Closing Date, to purchase from the Company all
or a portion  of 4,005  shares of the  Series E  Preferred  Stock for a purchase
price per share of $1,000, in accordance with Section 6 hereof.

                  (e) Exemption from Registration. The Securities will be issued
under an exemption or exemptions from  registration  under the Securities Act of
1933,  as amended  (the  "Securities  Act");  accordingly,  the  certificate  or
certificates  evidencing  the  Securities,  and any shares of  Sheffield  Common
Stock,  Newco Common

                                      -2-
<PAGE>

Stock  or  Newco  Preferred  Stock  issuable  upon  the  exercise,  exchange  or
conversion of any of the Securities shall, upon issuance,  contain the following
legend:

         THE SECURITIES  REPRESENTED  HEREBY HAVE NOT BEEN REGISTERED  UNDER THE
         SECURITIES  ACT OF 1933, AS AMENDED (THE "ACT"),  AND MAY NOT UNDER ANY
         CIRCUMSTANCES   BE  TRANSFERRED   WITHOUT  AN  EFFECTIVE   REGISTRATION
         STATEMENT FOR SUCH SECURITIES UNDER THE ACT OF AND ANY APPLICABLE STATE
         SECURITIES   LAWS  OR  AN  OPINION  OF  COUNSEL   SATISFACTORY  TO  THE
         CORPORATION  THAT  REGISTRATION  IS  NOT  REQUIRED  UNDER  SUCH  ACT OR
         APPLICABLE STATE SECURITIES LAWS.

                  (f) Registration  Rights  Agreement.  On the date hereof,  the
Company and EIS shall execute and deliver (i) the Sheffield  Registration Rights
Agreement,  covering the resale by EIS of the  Sheffield  Common Stock  issuable
upon  conversion,  exercise or exchange  of any of the  Securities  and (ii) the
Newco Registration Rights Agreement,  covering the resale by EIS and the Company
of the Newco Common Stock issuable, directly or indirectly, upon exchange of any
of the Securities.

                  SECTION 2.  Representations and Warranties of the Company. (a)
Organization.  The  Company  is duly  organized,  validly  existing  and in good
standing under the laws of the State of Delaware and has all requisite corporate
power and authority to own and lease its properties, to carry on its business as
presently  conducted  and as  proposed to be  conducted  and to  consummate  the
transactions  contemplated  hereby.  As of  the  date  hereof,  the  Company  is
qualified  and in good  standing to do business  in  jurisdictions  set forth on
Schedule 2(a), which constitute all of the  jurisdictions in which the nature of
the business conducted or the property owned by it requires such  qualification,
except where the failure to so qualify would not have a material  adverse effect
on the business, prospects,  properties or condition (financial or otherwise) of
the Company (a "Material Adverse Effect").

                  (b) Capitalization.  As of the date hereof, (i) the authorized
capital  stock of the Company  consists of (A)  60,000,000  shares of  Sheffield
Common Stock,  par value $0.01 per share and (B)  3,000,000  shares of Preferred
Stock,  par  value  $0.01  per  share,  (w)  23,000  shares  of which  have been
designated  as Series C Cumulative  Preferred  Stock,  par value $0.01 per share
("Series C Preferred  Stock"),  (x) 21,000 shares of which have been  designated
Series D Preferred  Stock,  (y) 9,000  shares of which have been  designated  as
Series E Preferred  Stock and (z) 5,000 shares of which have been  designated as
Series F Preferred Stock. As of the date hereof,  27,296,346 shares of Sheffield
Common Stock were issued and  outstanding;  12,556  shares of Series C Preferred
Stock were issued and  outstanding;  and no shares of Series D Preferred  Stock,
Series  E  Preferred   Stock  or  Series  F  Preferred  Stock  were  issued  and
outstanding.

                  (ii) Except as listed in Schedule 2(b), as of the date hereof,
there are no  options,  warrants  or other  rights  outstanding  to  purchase or
otherwise  acquire,  or any  securities  convertible  into, any of the Company's
authorized  capital  stock.  Other  than as set forth in this  Agreement  and as
described  in  Schedule  2(b),   there  are  no  agreements,   arrangements   or
understandings  concerning the voting,  acquisition or disposition of any of the
Company's outstanding  securities to which the Company is a party or of which it
is otherwise aware entered into since June 30, 1998.  Other than as set forth in
Schedule 2(b) or in the Registration Rights Agreements,  since June 30, 1998 the
Company has not entered  into any  agreement  to register  any of the  Company's
outstanding  securities  under the U.S.  federal  securities  laws  relating  to
securities that have not already been registered under the Securities Act.

                  (iii) All of the  outstanding  shares of capital  stock of the
Company  have been  issued in  accordance  with  applicable  state,  federal and
foreign laws and regulations governing the sale and purchase of securities,  all
of such shares  have been duly and validly  issued and all such shares are fully
paid and  non-assessable,  and none of such shares carries preemptive or similar
rights.
                                      -3-

<PAGE>
                  (c)  Authorization of Transaction  Documents.  The Company has
full  corporate  power and  authority to execute and deliver this  Agreement and
each  of the  other  Transaction  Documents,  and  to  perform  its  obligations
hereunder and thereunder. The execution, delivery and performance by the Company
of the Transaction Documents (including the issuance and sale of the Securities)
have been authorized by all requisite corporate actions by the Company;  and the
Transaction Documents,  including the issuance and sale of the Securities,  have
been duly  executed  and  delivered by the Company and are the valid and binding
obligations of the Company,  enforceable  against the Company in accordance with
their respective terms.

                  (d) No Violation.  The execution,  delivery and performance by
the Company of the Transaction Documents (including the issuance and sale of the
Securities  and the issuance of all  securities  issuable  upon the  conversion,
exchange  or  exercise  of any of  the  Securities),  and  compliance  with  the
provisions  thereof,  will not (i)  violate any  provision  of  applicable  law,
statute,  rule or  regulation  applicable  to the Company or any  ruling,  writ,
injunction,  order, judgment or decree of any court, arbitrator,  administrative
agency or other  governmental  body  applicable  to the  Company or any of their
respective  properties  or assets or (ii) conflict with or result in a breach of
any of the terms,  conditions  or provisions  of, or constitute  (with notice or
lapse of time or both) a  default  (or give  rise to any  right of  termination,
cancellation  or  acceleration)  under,  or  result  in  the  creation  of,  any
Encumbrance  (as  defined  below)  upon any of the  properties  or assets of the
Company under its Certificate of Incorporation,  as amended, its Certificates of
Designations  (in the various forms to be filed as provided  herein) or By-laws,
or any  material  contract  to which the Company is a party,  except  where such
violation,  conflict or breach would not, individually or in the aggregate, have
a Material Adverse Effect. As used herein,  "Encumbrance"  shall mean any liens,
charges,  encumbrances,  equities,  claims, options,  proxies, pledges, security
interests,  or other similar  rights of any nature,  except for such  conflicts,
breaches or defaults which would not,  individually or in the aggregate,  have a
Material Adverse Effect.

                  (e)  Approvals.  Except  as set  forth on  Schedule  2(e),  no
material  permit,   authorization,   consent  or  approval  of  or  by,  or  any
notification of or filing with, any person or entity (governmental or otherwise)
is required in connection  with the  execution,  delivery or  performance of the
Transaction Documents, including the issuance and sale of the Securities and the
securities  issuable  upon the  conversion,  exchange  or exercise of any of the
Securities,  by the Company.  Except as set forth on Schedule 2(e),  there is no
approval of the Company's  stockholders  required under any applicable  statute,
rule or regulation in connection with the execution and delivery the Transaction
Documents  or  the  consummation  of  the  transactions   contemplated  thereby,
including the filing of the  Certificates of  Designations,  the issuance of the
Securities and the securities issuable upon the conversion, exchange or exercise
of any of the Securities and the listing of the shares of Sheffield Common Stock
issuable upon the  conversion,  exercise or exchange of any of the Securities on
the American Stock Exchange.

                  (f) Filings,  Taxes and Financial Statements.  (i) The Company
has filed its annual  report on Form 10-K for the year ended  December  31, 1998
(the "Annual  Report"),  its related proxy materials and the quarterly report on
Form 10-Q for the quarter ended June 30, 1999 (the "Quarterly  Report," together
with the Annual  Report,  including  all exhibits and  schedules  required to be
filed in  connection  therewith,  the "SEC  Filings")  with the  Securities  and
Exchange Commission,  the American Stock Exchange,  Inc., and any other required
person or entity (governmental or otherwise) in a timely manner and as otherwise
required by applicable laws and  regulations,  including the federal  securities
laws. The audited financial  statements of the Company for the fiscal year ended
December  31,  1998  included  in the  Annual  Report  (the  "Audited  Financial
Statements"),  and the Company's  unaudited  balance sheet for the period ending
June 30, 1999, together with the accompanying  statements of operations and cash
flows  including the notes thereto in the Quarterly  Report (the "June Financial
Statements"; collectively, with the Audited Financial Statements, the "Financial
Statements")  are  accurate  and  complete in all  material  respects and fairly
present the financial  condition of the Company as at the dates thereof and have
been  prepared in  accordance  with  generally  accepted  accounting  principles
applied on a consistent basis throughout the periods indicated (except as may be
otherwise indicated in such financial statements or the notes thereto), subject,
in the  case  of  the  June  Financial  Statements,  to  normal  year-end  audit
adjustments  (which shall not be material in the  aggregate)  and the absence of
footnote disclosures.

                  (ii) The  Company  has filed in a timely  manner all  material
federal,   state,   local  and   foreign  tax   returns,   reports  and  filings
(collectively,  "Returns"),  including  income,  franchise,


                                      -4-
<PAGE>

property  and other  taxes,  and has paid or  accrued  the  appropriate  amounts
reflected  on such  Returns.  None of the Returns  have been,  or as of the date
hereof and to the  knowledge of the Company,  are  currently  being,  audited or
challenged, nor has the Company received any notice of challenge nor have any of
the amounts or other data included in the Returns been challenged or reviewed by
any governmental authority.

                  (iii)  Except as  disclosed  in the SEC  Filings  or listed in
Schedule 2(f),  which sets forth a true and accurate list and description of any
employee  benefit  plans  maintained or sponsored by the Company or to which the
Company is  required  to make  contributions,  the  Company  does not  maintain,
sponsor,  and is not required to make  contributions  to or  otherwise  have any
liability  with  respect  to  any  pension,  profit  sharing,  thrift  or  other
retirement plan,  employee stock ownership plan,  deferred  compensation,  stock
ownership,  stock purchase,  performance  share,  bonus or other incentive plan,
severance plan,  health or group insurance plan,  welfare plan, or other similar
plan, agreement,  policy or understanding  (whether written or oral), whether or
not such plan is  intended to be  qualified  under  Section  401(a) of the Code,
within the meaning of Section 3(3) of the Employee  Retirement  Income  Security
Act of 1974,  as amended,  which plan covers any employee or former  employee of
the Company.

                  (g) Absence of Changes.  Except as set forth on Schedule 2(g),
since June 30, 1999 there has not been (a) any  material  adverse  change in the
business,  properties,   condition  (financial  or  otherwise),   operations  or
prospects of the Company;  (b) any damage,  destruction or loss,  whether or not
covered  by  insurance,   materially  and  adversely   affecting  the  business,
properties,  condition (financial or otherwise),  operations or prospects of the
Company; (c) any declaration,  setting aside or payment of any dividend or other
distribution or payment  (whether in cash,  stock or property) in respect of the
capital stock of the Company (other than in respect of the Company's outstanding
Series C Preferred  Stock), or any redemption or other acquisition of such stock
by the  Company;  (d) any  disposal  or lapse of any  trade  secret,  invention,
patent,   trademark,   trademark   registration,   service  mark,  service  mark
registration,  copyright, copyright registration, or any application therefor or
filing in respect thereof that had a Material  Adverse  Effect;  (e) loss of the
services of any of the key  officers or key  employees of the Company that had a
Material  Adverse  Effect;  (f)  other  than  with  EIS,  its  subsidiaries  and
affiliates,  any  incurrence  of or entry into any  liability,  mortgage,  lien,
commitment  or  transaction,  including  without  limitation,  any borrowing (or
assumption or guarantee thereof) or guarantee of a third party's obligations, or
capital expenditure (or lease in the nature of a conditional purchase of capital
equipment) in excess of $100,000;  or (g) any material  change by the Company in
accounting  methods or principles or (h) any change in the assets,  liabilities,
condition  (financial or  otherwise),  results or operations or prospects of the
Company from those  reflected on the  Quarterly  Report,  except  changes in the
ordinary course of business that have not, individually or in the aggregate, had
a Material Adverse Effect.

                  (h) No  Liabilities.  Except  as set  forth  in the  Quarterly
Report attached  hereto,  the Company has not incurred or suffered any liability
or  obligation,  matured or unmatured,  contingent  or otherwise,  except in the
ordinary course of business that have  individually  or in the aggregate,  had a
Material Adverse Effect.

                  (i) Properties and Assets;  Etc. (i) The SEC Filings  disclose
all  patents  and other  intellectual  property  material  to the  business  and
operations  of  the  Company  and  all  applications   therefore  and  licenses,
sublicenses  or agreements in respect  thereof which the Company owns or has the
right to use or to which the Company is a party (the "Proprietary  Rights"). The
Proprietary  Rights are  adequate  for the  conduct of the  Company's  business.
Except as set forth in the SEC Filings,  the  agreements  evidencing the License
Arrangements,  the licenses of Proprietary  Rights to or from Systemic Pulmonary
Delivery,  Ltd. or where the absence of which would not have a Material  Adverse
Effect, (A) the Company is the sole and exclusive owner of all rights, title and
interest to all Proprietary Rights free and clear of all liens, claims, charges,
equities,  rights of use,  encumbrances  and  restrictions  whatsoever,  (B) the
Company does not have  knowledge of any basis for any claim of  infringement  or
misappropriation   contesting  the  validity  or  Company's  right  to  use  any
Proprietary Rights; (C) all of such patents,  trademark  registrations,  service
mark  registrations,  trade name  registrations  and  copyrights  and  copyright
registrations,  whether foreign or domestic,  have been duly issued and have not
been canceled,  abandoned, or otherwise terminated; and (D) all of the Company's
patent applications,  trademark applications,  service mark applications,  trade
name applications and copyright applications have been duly filed.


                                      -5-

<PAGE>
                  (ii)  Each  of  the  contracts  listed  as an  exhibit  to the
Company's  SEC Filings is a legal and valid  agreement  binding upon each of the
parties  thereto and is in full force and effect except where the  expiration or
termination have not,  individually or in the aggregate,  had a Material Adverse
Effect.  To the best knowledge of the Company,  there is no breach or default by
any  party  thereunder  that  had a  Material  Adverse  Effect.  Such  contracts
constitute all material agreements,  arrangements or understandings  required to
be included as an exhibit in such reports under Item 601 of the  Securities  and
Exchange Commission Regulations.

                  (iii) The Company has and  maintains  adequate and  sufficient
insurance,  including  liability,  casualty  and products  liability  insurance,
covering risks  associated with its business,  properties and assets,  including
insurance that is customary for companies similarly situated.

                  (iv) The Company,  its business and  properties and assets are
in  compliance,   in  all  material  respects,  with  all  applicable  laws  and
regulations,  including without limitation, those relating to (a) health, safety
and employee relations,  (b) environmental  matters,  including the discharge of
any hazardous or potentially  hazardous materials into the environment,  and (c)
the development,  commercialization and sale of pharmaceutical and biotechnology
products,  including  all  applicable  regulations  of the  U.S.  Food  and Drug
Administration and comparable foreign regulatory authorities.

                  (j) Legal  Proceedings,  etc.  Except as set forth on Schedule
2(j),  there  is no  legal,  administrative,  arbitration  or  other  action  or
proceeding  or  governmental  investigation  pending or, to the  Company's  best
knowledge,  threatened against the Company, or any director, officer or employee
of the Company,  which is required to be described in the SEC Filings and is not
so described. The Company is not in violation of, or default under, any material
laws,  judgments,  injunctions,  orders or decrees  of any  court,  governmental
department,  commission, agency, instrumentality or arbitrator applicable to its
business.

                  (k) Disclosure. The Company's SEC Filings and periodic reports
subsequently  filed under Section 13 of the Securities  Exchange Act of 1934, as
amended (the "Exchange Act"), and the  representations  and warranties set forth
herein and the Transaction Documents,  when viewed collectively,  do not contain
any untrue  statement  of a  material  fact or omit to state any  material  fact
necessary to make the statements  contained herein and therein not misleading in
light of circumstances in which they were made.

                  (l) Brokers or  Finders.  The  Company  has not  retained  any
investment  banker,  broker  or  finder  in  connection  with  the  transactions
contemplated  by the  Transaction  Documents,  other than Tucker  Anthony Cleary
Gull, the fee of which are payable solely by the Company.

                   SECTION 3.  Representation  and Warranties of EIS. EIS hereby
represents and warrants to the Company as follows:

                  (a) Organization. EIS is a corporation duly organized, validly
existing and in good  standing  under the laws of Bermuda and has all  requisite
corporate power and authority to own and lease its  properties,  to carry on its
business  as  presently  conducted  and  as  proposed  to be  conducted  and  to
consummate the transactions  contemplated  hereby.  EIS is qualified and in good
standing to do business in each jurisdiction in which the nature of the business
conducted or the property owned by it requires such qualification,  except where
the failure to so qualify  would not  reasonably  be expected to have a material
adverse effect on the business or condition (financial or otherwise) of EIS.

                  (b)  Authorization  of  Agreement.  EIS has full legal  right,
power and  authority to enter into this  Agreement  and perform its  obligations
hereunder,  which have been duly authorized by all requisite  corporate  action.
This  Agreement  and the  purchase of the  Securities  are the valid and binding
obligations of EIS, enforceable against them in accordance with their terms.


                                      -6-
<PAGE>
                  (c) No Conflicts.  The execution,  delivery and performance by
EIS of this  Agreement,  the  purchase  and  acceptance  of the  Securities  and
compliance with provisions hereof by EIS, will not (i) violate any provisions of
applicable  law,  statute,  rule or regulation  applicable to EIS or any ruling,
writ,  injunction,   order,  judgment  or  decree  of  any  court,  arbitration,
administrative agency or other governmental body applicable to EIS or any of its
properties or assets or (ii) conflict with or result in any breach of any of the
terms,  conditions or provisions of, or constitute (with notice or lapse of time
to both) a default (or give rise to any right of  termination,  cancellation  or
acceleration)  under, or result in the creation of any  Encumbrance  upon any of
the  properties  or  assets of EIS under its  Certificate  of  Incorporation  or
By-laws  or any  material  contract  to which EIS is party,  except  where  such
violation,  conflict or breach would not, individually or in the aggregate, have
a material adverse effect on EIS.

                  (d) Approvals. No permit, authorization,  consents or approval
of or  by,  or  any  notification  of or  filing  with,  any  person  or  entity
(governmental  or  otherwise)  is required  in  connection  with the  execution,
delivery or performance of this Agreement  (including the funding and acceptance
thereof) by EIS.

                  (e)  Investment  Representations.  (i)  EIS is an  "accredited
investor" as defined in Rule 501(a) of  Regulation  D. EIS is  sophisticated  in
transactions  of this type and capable of evaluating the merits and risks of the
transactions  described herein and in the other Transaction  Documents,  has the
capacity to protect its own  interests,  has reviewed  the SEC  Filings,  and is
aware of the risk factors  relating to an investment in the Company as disclosed
in such filings. EIS has not been formed solely for the purpose of entering into
the  transactions  described  herein and therein and is acquiring the Securities
for investment for its own account,  not as a nominee or agent, and not with the
view to  distribute  or sell  any part  thereof;  provided,  that  EIS  shall be
permitted to convert,  exchange or exercise such Securities and/or transfer them
as  permitted  herein  and  under  applicable  law.  EIS has been  afforded  the
opportunity to ask questions of, and receive  information about, the Company and
its business and prospects,  from management and representatives of the Company,
and has relied on its own  independent  judgment  in making a judgment  about an
investment in the Securities.

                  (ii) Nothing contained in this Section 3(e) shall limit any of
the Company's  representations  or warranties or limit EIS's recourse in respect
thereof.

                  (iii) EIS has not retained any  investment  banker,  broker or
finder in  connection  with the  transactions  contemplated  by the  Transaction
Documents.

                  SECTION 4. Covenants of the Company. (a) Non-disclosure.  From
and after the date  hereof,  neither the  Company nor EIS shall  disclose to any
person or entity (other than its directors, officers and agents who need to know
such  information in connection with the  transactions  described herein and the
other   Transaction   Documents,   each  of  whom  shall  be  informed  of  this
confidentiality  provision and in respect of whose breaches the Company shall be
responsible)  the  content  of this  Agreement  or any of the other  Transaction
Documents or the substance of the  transactions  described  herein,  without the
prior  written   consent  of  the  other  party  (which  consent  shall  not  be
unreasonably  withheld or delayed),  except to the extent required by applicable
laws,  regulations or administrative  or judicial  processes in respect of press
releases,  periodic reports or other public disclosure prepared in good faith by
the Company or EIS;  provided,  that EIS and the Company  shall each provide the
other with a reasonable  opportunity to review such releases or reports prior to
release.  This Section 4(a) shall not be construed to prohibit disclosure of any
information  which has not been previously  determined to be confidential by EIS
or the Company,  or which shall have become  publicly  disclosed  (other than by
breach obligations of the Company or EIS hereunder).

                  (b) Fully-diluted  Stock Ownership.  (i)  Notwithstanding  any
other provision of this  Agreement,  in the event that EIS shall have determined
that at any time it (together with its affiliates,  if applicable)  holds or has
the right to receive Sheffield Common Stock (or securities or rights, options or
warrants  exercisable,  exchangeable or convertible for or into Sheffield Common
Stock)  representing  in the  aggregate  in excess  of 19.9% of the  outstanding
Sheffield Common Stock (assuming any such exercise,  exchange or conversion, but
not the exercise, exchange or conversion of any other similar securities) or EIS
has otherwise  determined  that Elan would be required to equity account for its
investment in Sheffield,  EIS shall have the right (but not the obligation),  in
its sole discretion,  rather than acquiring such securities from the Company, to
exchange  such number of securities as are

                                      -7-
<PAGE>
necessary  so that  Elan  shall  not have to  equity  account,  for  non-voting,
convertible,  liquidation  preferred  stock of the  Company  on  terms  mutually
acceptable  to the Company and EIS such that EIS will not be required to account
for its  investments  under  the  equity  method.  In the  event  that EIS shall
undertake  to exercise  such right,  EIS shall  retain the  additional  right to
assign  all or a portion of such  convertible  securities  (including  Sheffield
Common Stock issuable upon conversion  thereof) to its  affiliates.  Each of EIS
and the  Company  shall use  commercially  reasonable  efforts  to  effect  such
transactions  and any required  subsequent  conversions  or adjustments to EIS's
securities position, on a quarterly basis, within 15 business days of the end of
each of EIS's fiscal quarter.

                  (ii) In the event  that,  after the first  anniversary  of the
date  hereof,  the  payment  to EIS of any  dividend  in kind upon the  Series D
Preferred  Stock  or  the  Series  E  Preferred  Stock  would  result  in  EIS's
fully-diluted  ownership of Sheffield Common Stock to exceed 49.9%,  such excess
dividends  (I.E.,  dividends  paid in kind, the payment of which would result in
EIS's  fully-diluted  ownership of Sheffield Common Stock exceeding 49.9%) shall
be paid to EIS through the issuance by the Company to EIS, in lieu of dividends,
of promissory  notes with an aggregate  principal  amount equal to the amount of
such excess  dividend that would  otherwise be paid in kind  (collectively,  the
"Dividend Notes"). The Dividend Notes shall (i) bear interest of 7.0% per annum,
compounded  semi-annually,  compounding  to commence six months after  issuance,
which shall be payable  through the issuance of  additional  Notes of like tenor
and (ii)  mature and become  immediately  due and payable in full in cash on the
sixth anniversary of the date thereof.

                  (c) Certain Preemptive Rights. For a period of four years from
and  after  the  date  hereof,  EIS  shall be  entitled  to  participate  in any
convertible or  exchangeable  debt,  equity,  warrant or convertible  securities
financing (the "Preemptive  Right")  undertaken by the Company (each, a "Capital
Raising"),  in order that EIS may maintain its then current PRO RATA  percentage
equity   ownership   interest  (on  a  fully  diluted  basis)  of  the  Company.
Notwithstanding the foregoing, the Preemptive Right shall terminate and be of no
further  force and effect at such time as equity  ownership  interest of EIS and
its  affiliates in the Company falls below 5%, on a  fully-diluted  basis.  Such
participation  by EIS  shall be on terms no less  attractive  to EIS than  those
offered  to  any  other  potential  investor  in a  Capital  Raising  financing;
provided,  that  such  Preemptive  Right  shall  not  apply to (i) any BONA FIDE
offering to the public  pursuant to the  Securities  Act, or (ii) an offering of
securities  solely in  connection  with (A) an  acquisition  of assets,  merger,
consolidation or similar transaction with an unaffiliated third party, or (B) an
employee stock option plan.

                  (d)  Use  of  Proceeds.  The  Company  shall  use  all  of the
aggregate  proceeds of the sale of the Series D Preferred Stock and the Series E
Preferred Stock solely for the purpose of meeting its capitalization and funding
commitments to Newco.

                  SECTION 5. Additional  Covenants of the Parties.  (a) Right of
Conversion.  (i) EIS may,  pursuant to the Series D Certificate of Designations,
after  the  second  anniversary  of the  date  hereof  and  prior  to the  sixth
anniversary  of the date  hereof,  convert  the  Series D  Preferred  Stock into
Sheffield  Common Stock as set forth in the Series D Certificate of Designations
(the "Series D Conversion Right").

                  (ii)  EIS  may,  pursuant  to  the  Series  E  Certificate  of
Designations,  after the second  anniversary of the date hereof and prior to the
sixth anniversary of the date hereof,  convert the Series E Preferred Stock into
Sheffield  Common Stock as set forth in the Series E Certificate of Designations
(the "Series E  Conversion  Right",  and  together  with the Series D Conversion
Right, collectively, the "Conversion Rights").

                  (b) Rights of Exchange.  (i) NEWCO EQUITY EXCHANGE RIGHT.  (A)
EIS may,  at its  option and in  accordance  with the  Series D  Certificate  of
Designations,  exchange  in whole  the  originally  issued  shares  of  Series D
Preferred  Stock,  any  Series D  Preferred  Stock  issued  as a  dividend  upon
outstanding Series D Preferred Stock, and all outstanding Dividend Notes held by
EIS, its  subsidiaries  and affiliates,  for all shares of Newco Preferred Stock
issued by Newco to the Company  pursuant to the Development  Agreement,  thereby
increasing EIS's  fully-diluted  ownership of outstanding  Newco Common Stock to
[REDACTED],  on a  fully  converted  basis,  assuming  the  conversion  of  such
exchanged  shares of Newco  Preferred  Stock and all  shares of Newco  Preferred
Stock  previously  issued to EIS as  described  in Recital D above (the  "Equity
Exchange  Right").  After the  exercise  of the  Equity  Exchange  Right and the
receipt by EIS of Newco Preferred Stock convertible, together with all shares of
Newco  Preferred  Stock  previously  issued  to  EIS,  into  [REDACTED]  of  the
outstanding Newco Common Stock, (I) the shares of Series D Preferred

                                       -8-
<PAGE>
Stock  exchanged  shall be cancelled and no longer entitle the holder thereof to
any rights with  respect to the Company,  and (II) all  Dividend  Notes shall be
immediately cancelled.

                           (B) The Equity  Exchange  Right shall  terminate upon
the earlier of (x) exercise of the Series D Conversion  Right by EIS and (y) the
sixth anniversary of the date hereof.

                           (C) If EIS exercises the Equity Exchange  Right,  EIS
shall,  at its option,  either (i) cause to be paid to the Company within thirty
days of the  consummation  of such equity exchange an amount equal to [REDACTED]
of the  aggregate  amount  provided to Newco (by or on behalf of the Company and
EIS and their  respective  affiliates and  subsidiaries) to fund the agreed upon
initial  research and development  budget of Newco (the  "Development  Funding")
from and after the Closing  Date and prior to the date of exercise of the Equity
Exchange  Right,  (ii) surrender to the Company for  cancellation  shares of the
Series E  Preferred  Stock with an  aggregate  liquidation  preference  equal to
[REDACTED] of the aggregate amount of Development  Funding provided to Newco (by
or on  behalf  of the  Company  and  EIS and  their  respective  affiliates  and
subsidiaries)  from and after the Closing Date and prior to the date of exercise
of the Equity  Exchange  Right, or (iii) elect to satisfy such obligation with a
combination of the payment methods set forth in clauses (i) and (ii) above.

                  (ii) SHEFFIELD DEBT EXCHANGE. All shares of Series D Preferred
Stock (including all shares issued as dividends thereon), all shares of Series E
Preferred (including all shares issued as dividends thereon) and all outstanding
Dividend  Notes shall be  exchanged  by the  Company for one or more  promissory
notes with an aggregate  principal  amount equal to the sum of (A) the aggregate
principal  amount of all  outstanding  Dividend Notes and all accrued and unpaid
interest  thereon,  (B) the  aggregate  liquidation  preference of all shares of
Series D Preferred Stock  (including all shares issued as dividends  thereon and
all accrued but unpaid  dividends  thereon)  and (C) the  aggregate  liquidation
preference  of all  shares of Series E  Preferred  Stock  (including  all shares
issued as dividends  thereon and all accrued but unpaid dividends  thereon) (the
"Debt Exchange"), unless on or before the first anniversary of the Closing Date,
the Company has provided to EIS (and any  permitted  transferee  of EIS) written
evidence that (I) the issuance of the Series D Preferred  Stock and the Series E
Preferred  Stock and the issuance and listing upon the American  Stock  Exchange
("AMEX")  of the  shares  of  Sheffield  Common  Stock  to be  issued  upon  the
conversion of the Series D Preferred  Stock and the Series E Preferred Stock has
been approved or ratified by the  stockholders of the Company in accordance with
the  General  Corporation  Law of the  State  of  Delaware  and  the  rules  and
regulations  of the AMEX or (II)  that  such  approval  or  ratification  is not
required by the applicable  rules of the AMEX. The promissory notes to be issued
upon the  consummation of the Debt Exchange shall be in the form attached to the
Series D Certificate of  Designations,  the Series E Certificate of Designations
and the Dividend Notes.

                  (c) Further  Assurances.  From and after the date hereof, each
of the  parties  hereto  agree to do or cause to be done such  further  acts and
things and  deliver  or cause to be  delivered  to each  other  such  additional
assignments,  agreements, powers and instruments, as each may reasonably require
or deem  advisable,  to carry into effect the purposes of this Agreement and the
other  Transaction  Documents or to better to assure and confirm unto each other
their respective rights, powers and remedies hereunder and thereunder.
                                      -9-

<PAGE>
                  SECTION 6. Series E Preferred Stock.  (a) Issuance.  (i) As of
the date hereof and until the date which is the 36 month anniversary of the date
hereof,  EIS shall be required,  at the Company's option as exercised by written
notice to EIS, to  purchase  shares of Series E  Preferred  Stock,  to be issued
pursuant  to  the  Series  E   Certificate   of   Designations,   for  aggregate
consideration  of  up  to  $4,005,000,  at a  price  per  share  of  $1,000  and
[REDACTED].

                  (b) Conditions to the Purchase of Series E Preferred Stock. It
shall be a condition  to EIS's  obligation  to  purchase  the Series E Preferred
Stock that (A) each of the representations and warranties set forth in Section 2
of this Agreement  shall be true and correct in all material  respects as if the
date hereof were the proposed funding date thereof; provided, that any reference
to the Quarterly  Report shall refer to the most recent quarterly report on Form
10-Q  and/or any report  filed  pursuant  to  Section  13 of the  Exchange  Act,
required to be filed by the Company under  applicable law  immediately  prior to
such funding date and SEC Filings shall refer to all filings required to be made
by the Company under applicable law on or prior to such date, (B) there shall be
no  default  or breach in any  material  respect  by the  Company  or Newco of a
material  obligation  under  any  of the  Transaction  Documents  or  any  other
agreement  between  the  Company or Newco or any of its  affiliates,  on the one
hand, and EIS or any of their affiliates, on the other hand, and [REDACTED].

                  SECTION 7. Survival and Indemnification.  (a) Survival Period.
The representations and warranties of the Company and EIS contained herein shall
survive for a period of one year from and after the date hereof.

                  (b)  Indemnification.  In addition to all rights and  remedies
available to the parties  hereunder  at law or in equity,  each party hereto (in
such capacity, an "Indemnifying Party") shall indemnify each other party hereto,
and its  respective  affiliates,  and its respective  affiliates'  stockholders,
officers, directors, employees, agents, representatives,  successors and assigns
(collectively,  the  "Indemnified  Person"),  and save and hold each Indemnified
Person  harmless  from and against and pay on behalf of or  reimburse  each such
Indemnified  Person,  as and when  incurred,  for any and all  loss,  liability,
demand, claim, action, cause of action, cost, damage, deficiency,  tax, penalty,
fine or  expense,  whether or not  arising  out of any claims by or on behalf of
such  Indemnified  Person or any third  party,  including  interest,  penalties,
reasonable  attorneys' fees and expenses and all amounts paid in  investigation,
defense or settlement of any of the foregoing (collectively, "Losses"), that any
such Indemnified  Person may suffer,  sustain,  incur or become subject to, as a
result of, in connection with, relating, or incidental, to or by virtue of:

                           (i) any  misrepresentation  or breach of  warranty on
the part of the Indemnifying Party under Section 2 or 3 of this Agreement; or

                           (ii) any  nonfulfillment,  default  or  breach of any
covenant or agreement on the part of the  Indemnifying  Party under Section 4, 5
or 6 of this Agreement.

                  (c)  Maximum  Recovery.   Notwithstanding   anything  in  this
Agreement  to the  contrary,  in no  event  shall  the  Company  be  liable  for
indemnification under this Section 7, the Transaction  Documents,  or otherwise,
in an amount in excess of  [REDACTED] in the  aggregate.  No  Indemnified  Party
shall assert any such claim  unless  Losses in respect  thereof  incurred by any
Indemnified Party, when aggregated with all previous Losses hereunder,  equal or
exceed $50,000;  and after the $50,000  threshold is reached,  each  Indemnified
Person shall be entitled to be indemnified  for the amount of all claims arising
hereunder in excess of $50,000.

                  (d) Exception.  Notwithstanding the foregoing,  and subject to
the following sentence,  upon judicial determination that is final and no longer
appealable that the act or omission giving rise to the indemnification set forth
above  resulted  primarily out of or was based  primarily  upon the  Indemnified
Person's negligence (unless such Indemnified  Person's negligence was based upon
the Indemnified Person's reliance in good faith upon any of the representations,
warranties,  covenants or promises  made by the  Indemnifying  Party herein) the
Indemnifying  Party  shall  not be  responsible  for  any  Losses  sought  to be
indemnified  in  connection  therewith,  and the  Indemnifying  Party  shall  be
entitled to recover from the Indemnified  Person all amounts  previously paid in
full or partial  satisfaction  of such  indemnity,  together  with all costs and
expenses  (including  reasonable  attorney's  fees)


                                      -10-
<PAGE>

of the Indemnifying Party reasonably incurred in connection with the Indemnified
Party's  claim  for  indemnity,  together  with  interest  at the rate per annum
publicly  announced by Morgan  Guaranty Trust Company as its prime rate from the
time of payment of such amounts to the Indemnified Person until repayment to the
Indemnifying Party.

                  (e) Investigation.  All indemnification rights hereunder shall
survive the execution and delivery of this Agreement and the consummation of the
transactions  contemplated  hereby to the extent provided in Section 7(b) above,
irrespective of any investigation,  inquiry or examination made for or on behalf
of the Indemnified Person or the acceptance of any certificate or opinion.

                  (f)  Contribution.  If the  indemnity  provided  for  in  this
Section 7 is in whole or in part  unavailable to any  Indemnified  Person due to
Section 7(b) being declared  unenforceable by a court of competent  jurisdiction
based upon reasons of public policy,  so that Section 7(b) shall be insufficient
to hold each such Indemnified  Person harmless from Losses which would otherwise
be indemnified hereunder, then the Indemnifying Party and the Indemnified Person
shall  each  contribute  to the  amount  paid or  payable  for such Loss in such
proportion as is appropriate to reflect not only the relative  benefits received
by the  Indemnifying  Party on the one hand and the  Indemnified  Person  on the
other, but also the relative fault of the Indemnifying  Party and be in addition
to any liability  that the  Indemnifying  Party may otherwise  have.  Subject to
Section 7(g) hereunder,  the indemnity,  contribution and expense  reimbursement
obligations that the  Indemnifying  Party has under this Section 7 shall survive
the expiration of the  Transaction  Documents.  The parties hereto further agree
that  the  indemnification  and  reimbursement  commitments  set  forth  in this
Agreement shall apply whether or not the Indemnified Person is a formal party to
any such lawsuit, claims or other proceedings.

                  (g)  Limitation.  No claim shall be brought by an  Indemnified
Person in  respect of any  misrepresentation  or breach of  warranty  under this
Agreement  after  one year from and  after  the date  hereof;  and any claim for
nonfulfillment,  default or breach of any covenant  shall be brought  within one
year of the date that such Indemnified Person became aware or should have become
aware of the  nonfulfillment,  default  or  breach.  Except  as set forth in the
previous  sentence and in Section 7(c) above,  this Section 7 is not intended to
limit the  rights or  remedies  otherwise  available  to any party  hereto  with
respect to this Agreement or the other Transaction Documents.

                  SECTION 8. Notices.  All notices,  demands and requests of any
kind to be delivered to any party in connection  with this Agreement shall be in
writing  and  shall be deemed to have  been  duly  given if  personally  or hand
delivered or if sent by an internationally-recognized overnight delivery service
or by  registered or certified  airmail,  return  receipt  requested and postage
prepaid, addressed as follows:

                           (i) if to the Company:

                                 Sheffield Pharmaceuticals, Inc.
                                 South Winton Court
                                 3136 Winton Road South
                                 Suite 306
                                 Rochester, NY  14623
                                 Attention: Chairman

                           and

                                 Sheffield Pharmaceuticals, Inc.
                                 425 South Woodsmill Road
                                 St. Louis, Missouri 63017-3441
                                 Attention: Chief Executive Officer

                           with a copy to:

                                 Olshan Grundman Frome, Rosenzweig & Wolosky LLP
                                 505 Park Avenue
                                 New York, NY  10022
                                 Attention: Daniel J. Gallagher

                                      -11-
<PAGE>

                           (ii) if to EIS:

                                 Elan International Services, Ltd.
                                 Flatts, Smiths Parish
                                 Bermuda, FL04
                                 Attention: Director

                                 with a copy to:

                                 Brock Silverstein LLC
                                 800 Third Avenue, 21st Floor
                                 New York, New York 10022
                                 Attention: Scott Rosenblatt

or to such  other  address  as the party to whom  notice is to be given may have
furnished to the other party hereto in writing in accordance  with provisions of
this  Section 8. Any such notice or  communication  shall be deemed to have been
received  (i) in the  case of  personal  or hand  delivery,  on the date of such
delivery, (ii) in the case of an  internationally-recognized  overnight delivery
service,  on the second  business  day after the date when sent and (iii) in the
case of mailing, on the fifth business day following that day on which the piece
of mail containing such  communication is posted.  Notice hereunder may be given
on behalf of the parties by their respective attorneys.

                  SECTION 9.  Entire  Agreement.  This  Agreement  and the other
Transaction  Documents  contain the entire  understanding  of the  parties  with
respect to the subject  matter  hereof and supersede  all prior  agreements  and
understandings among the parties with respect thereto.

                  SECTION 10. Amendments.  This Agreement may not be modified or
amended, or any of the provisions hereof waived,  except by written agreement of
the Company and EIS.

                  SECTION  11.  Counterparts  and  Facsimile.   The  Transaction
Documents  may  be  executed  in any  number  of  counterparts,  and  each  such
counterpart  hereof shall be deemed to be an original  instrument,  but all such
counterparts  together shall  constitute one agreement.  Each of the Transaction
Documents  may  be  signed  and  delivered  to  the  other  party  by  facsimile
transmission.

                  SECTION  12.  Headings.  The section  and  paragraph  headings
contained in this Agreement are for reference purposes only and shall not affect
in any way the meaning or interpretation of the Agreement.

                  SECTION 13. Governing Law. This Agreement shall be governed by
and  construed  in  accordance  with the laws of the State of New York,  without
giving  effect to principles  of conflicts of laws.  Each of the parties  hereby
irrevocably  submits to the  jurisdiction of any New York State or United States
Federal court sitting in the county,  city and state of New York over any action
or  proceeding  arising  out of or  relating  to  this  Agreement  or the  other
Transaction  Documents;  and each hereby  waives the defense of an  inconvenient
forum for the maintenance of such an action.

                  SECTION  14.  Expenses.  Each of the parties  hereto  shall be
responsible  for its own costs and  expenses  incurred  in  connection  with the
transactions contemplated hereby and by the other Transaction Documents.

                  SECTION 15. Public Releases; Etc. The parties shall reasonably
agree upon the  contents  of any press  release  or  releases  and other  public
disclosure in respect of the transactions contemplated hereby, and except as may
otherwise be required by applicable law or judicial or administrative process or
which the Company  concludes in good faith is required by applicable  securities
laws and regulations.


                                      -12-
<PAGE>

                  SECTION 16.  Schedules,  etc. All statements  contained in any
exhibit or  schedule  delivered  by or on behalf of the  parties  hereto,  or in
connection with the transactions  contemplated  hereby,  are an integral part of
this Agreement and shall be deemed representations and warranties hereunder.

                  SECTION  17.  Assignments.  This  Agreement  and  all  of  the
provisions  hereof shall be binding upon and inure to the benefit of the parties
hereto  and their  respective  successors  and  permitted  assigns,  subject  to
compliance with the representations and warranties  contained in Section 3(e) of
this Agreement.  This Agreement,  the Transaction Documents,  and the Securities
may be assigned by EIS to its affiliates and subsidiaries.

                  SECTION 18. Currency.  All references to "$" or dollars herein
shall mean United States dollars.




                                      -13-
<PAGE>
                  IN WITNESS WHEREOF,  each of the undersigned has duly executed
this Securities Purchase Agreement as of the date first written above.


                               SHEFFIELD PHARMACEUTICALS, INC.


                               By: /s/ Loren G. Peterson
                                   -------------------------
                                  Name:
                                  Title:


                               ELAN INTERNATIONAL SERVICES, LTD.


                               By:/s/ Kevin Insley
                                  ---------------------------
                                  Name:
                                  Title:





             SUBSCRIPTION, JOINT DEVELOPMENT AND OPERATING AGREEMENT



                        ELAN PHARMA INTERNATIONAL LIMITED



                        ELAN INTERNATIONAL SERVICES, LTD.



                                       AND



                         SHEFFIELD PHARMACEUTICALS, INC.



                                       AND



                              SHEFFIELD NEWCO, LTD.




<PAGE>
                                      INDEX


CLAUSE 1         DEFINITIONS

CLAUSE 2         NEWCO'S BUSINESS

CLAUSE 3         REPRESENTATIONS AND WARRANTIES

CLAUSE 4         AUTHORIZATION AND CLOSING

CLAUSE 5         DIRECTORS; MANAGEMENT AND R&D COMMITTEES

CLAUSE 6         THE BUSINESS PLAN AND REVIEWS

CLAUSE 7         RESEARCH AND DEVELOPMENT

CLAUSE 8         COMMERCIALIZATION

CLAUSE 9         SUBLICENSE AND ASSIGNMENT RIGHTS

CLAUSE 10        OWNERSHIP OF INTELLECTUAL PROPERTY RIGHTS/NONCOMPETITION

CLAUSE 11        INTELLECTUAL PROPERTY RIGHTS

CLAUSE 12        CROSS LICENSING/EXPLOITATION OF PRODUCTS OUTSIDE FIELD

CLAUSE 13        REGULATORY

CLAUSE 14        MANUFACTURING

CLAUSE 15        TECHNICAL SERVICES AND ASSISTANCE

CLAUSE 16        AUDITORS, BANKERS, REGISTERED OFFICE,
                 ACCOUNTING REFERENCE DATE; SECRETARY; COUNSEL

CLAUSE 17        TRANSFER OF SHARES; RIGHTS OF FIRST OFFER; TAG ALONG RIGHTS

CLAUSE 18        MATTERS REQUIRING PARTICIPANTS' APPROVAL

<PAGE>

CLAUSE 19        DISPUTES

CLAUSE 20        TERMINATION

CLAUSE 21        SHARE RIGHTS

CLAUSE 22        CONFIDENTIALITY

CLAUSE 23        COSTS

CLAUSE 24        GENERAL


                                      iii

<PAGE>
THIS SUBSCRIPTION,  JOINT DEVELOPMENT AND OPERATING AGREEMENT made this 18th day
of October, 1999

BETWEEN:

(1)      ELAN  PHARMA   INTERNATIONAL   LIMITED,   a  public   limited   company
         incorporated  under the laws of  Ireland,  and  having  its  registered
         office at WIL House,  Shannon  Business  Park,  Shannon,  County Clare,
         Ireland ("EPIL")

(2)      ELAN   INTERNATIONAL   SERVICES,   LTD.,  a  private   limited  company
         incorporated  under the laws of  Bermuda,  and  having  its  registered
         office at Clarendon House, 2 Church St., Hamilton, Bermuda ("EIS");

(3)      SHEFFIELD  PHARMACEUTICALS,  INC. a corporation  duly  incorporated and
         validly  existing  under the laws of Delaware and having its  principal
         place of business at 425 South Woodsmill Road, Suite 270, St. Louis, MO
         63017, United States of America; and

(4)      SHEFFIELD NEWCO, LTD., a private limited company incorporated under the
         laws of Bermuda, and having its registered office at Clarendon House, 2
         Church St., Hamilton, Bermuda ("Newco").


RECITALS:

A.       Newco desires to issue and sell to the Stockholders (as defined below),
         and the  Stockholders  desire to  purchase  from Newco,  for  aggregate
         consideration  of  $7,500,000  apportioned  between  them as set  forth
         herein, 12,000 ordinary shares of Newco's common stock, par value $1.00
         per share (the "Common Stock"),  allocated to Sheffield.  Additionally,
         Newco  desires  to  issue  and  sell  to  the  Stockholders,   and  the
         Stockholders desire to purchase from Newco, for aggregate consideration
         of  $7,500,000,  apportioned  between them as set forth herein,  12,000
         shares of  Newco's  preferred  stock,  par value  $1.00 per share  (the
         "Preferred  Stock"),  allocated 7,224 shares to Sheffield for aggregate
         consideration  of  $4,515,000  and 4,776  shares  to EIS for  aggregate
         consideration of $2,985,000.

B.       As of the date hereof,  EPIL has entered into a license  agreement with
         Newco,  and Sheffield has entered into a license  agreement with Newco,
         in  connection  with the  license  to  Newco  of the Elan  Intellectual
         Property and the Sheffield Intellectual Property, respectively (each as
         defined below).

C.       Elan  and  Sheffield   have  agreed  to  co-operate  in  the  research,
         development  and  commercialization  of the Products (as defined below)
         based on their respective technologies.



<PAGE>
D.       Elan and  Sheffield  have agreed to enter into this  Agreement  for the
         purpose  of  recording  the  terms  and  conditions   regulating  their
         relationship with each other, with respect to the Licensed Technologies
         and with Newco.


NOW IT IS HEREBY AGREED AS FOLLOWS:

                                    CLAUSE 1

                                   DEFINITIONS

1.1      In this Agreement,  the following terms shall,  where not  inconsistent
         with the context, have the following meanings respectively.

         "Affiliate"   shall  mean  any   corporation  or  entity   controlling,
         controlled  or under the common  control of Elan or  Sheffield,  as the
         case may be. For the purpose of this  definition,  "control" shall mean
         direct or  indirect  ownership  of fifty  percent  (50%) or more of the
         stock or shares  entitled to vote for the election of directors.  Newco
         is not an Affiliate of Elan or EIS.

         "Agreement" shall mean this agreement (which expression shall be deemed
         to include the Recitals and the Schedules hereto).

         "Board" shall mean the board of directors of Newco.

         "Business" shall mean the business specified in the Business Plan.

         "Business Plan" shall mean the business plan and program of development
         to be  agreed by Elan and  Sheffield  pursuant  to Clause 6 that  shall
         contain,  among other things, to the extent  practicable,  the research
         and development objectives,  desired Product  specifications,  clinical
         indications,   preliminary   clinical   trial  designs   (Phase  I/II),
         development timelines, budgeted costs and the relative responsibilities
         of Sheffield  and Elan as it relates to the  implementation  of the R&D
         Plan.

         "Certificate of  Designations"  shall mean that certain  certificate of
         designations,  preferences  and rights of the Series D Preferred  Stock
         issued on the Closing Date.

         "Closing Date" shall mean the date upon which the Transaction Documents
         are executed and delivered by the Parties and the transactions effected
         thereby are closed.

         "Combined Fields" shall mean Field A, Field B and Field C.

         "Common Stock Equivalents" shall mean any options,  warrants, rights or
         any other securities convertible, exercisable or exchangeable, in whole
         or in part, for or into Common Stock.

                                      -2-
<PAGE>

         "Compounds"  shall  mean the Field A  Compound,  the  Field B  Compound
         and/or the Field C Compound.

         "Directors" shall mean, at any time, the directors of Newco.

         "Dividend  Notes"  shall mean  promissory  notes issued by Sheffield to
         holders of Series D Preferred  Stock as payment for dividends  pursuant
         to the Certificate of Designations.

         "EIS Director" has the meaning set forth in Clause 5.

         "Elan" shall mean EPIL and Affiliates and includes EIS and subsidiaries
         of Elan Corporation, Plc. within the division of Elan Corporation, Plc.
         carrying on business as Elan Pharmaceutical  Technologies but shall not
         include  Affiliates  and  subsidiaries  (present  or  future)  of  Elan
         Corporation Plc within the division of Elan  Corporation,  Plc carrying
         on business as Elan  Pharmaceuticals  which  incorporates,  inter alia,
         Targon Corporation,  Athena Neurosciences,  Inc., Elan Pharmaceuticals,
         Inc., Elan Diagnostics, Carnrick Laboratories, and Elan Europe Limited.

         "Elan  Improvements"  shall  mean  improvements  relating  to the  Elan
         Patents and/or the Elan Know-How,  developed (i) by Elan whether or not
         pursuant to the Project, (ii) by Newco or Sheffield or by a third party
         (under  contract  with Newco)  whether or not  pursuant to the Project,
         and/or (iii)  jointly by any  combination  of Elan,  Sheffield or Newco
         pursuant to the  Project,  except as limited by  agreements  with third
         Parties.  Subject to third party agreements,  Elan  Improvements  shall
         constitute  part of Elan  Intellectual  Property and be included in the
         license of the Elan Intellectual Property pursuant to Clause 2.1 of the
         Elan License  Agreement  solely for the purposes set forth therein.  If
         the  inclusion  of  an  Elan   Improvement   in  the  license  of  Elan
         Intellectual  Property  is  restricted  or  limited  by a  third  party
         agreement, Elan shall use reasonable commercial efforts to minimize any
         such restriction or limitation.

         "Elan  Intellectual  Property"  shall mean the Elan Know-How,  the Elan
         Patents and the Elan  Improvements.  For the  avoidance of doubt,  Elan
         Intellectual  Property  shall  exclude  (i)  Elan's  patent  rights and
         know-how  relating  to protein or  peptide  agents or  peptodomimetics,
         derivatives or analogs thereof,  designed to target a  pharmaceutically
         active  agent  to a  certain  site  or  sites  in the  body  (targeting
         technology) and (ii) inventions,  patents and know-how owned,  licensed
         or  controlled  by Axogen  Limited  and  Neuralab  Limited,  and by all
         Affiliates and  subsidiaries  (present or future) of Elan  Corporation,
         Plc. carrying on business as Elan  Pharmaceuticals  which incorporates,
         inter  alia,  Targon  Corporation,  Athena  Neurosciences,  Inc.,  Elan
         Pharmaceuticals,  Inc., Elan Diagnostics,  Carnrick  Laboratories,  and
         Elan Europe Limited.

         "Elan  Know-How"  shall  mean any and all  rights  owned,  licensed  or
         controlled by Elan to any discovery,  invention (whether  patentable or
         not),  know-how,  substances,  data,  techniques,  processes,  systems,
         formulations and designs relating to Nanocrystal(TM) Technology.
                                      -3-

<PAGE>

         "Elan License  Agreement" shall mean the license agreement between Elan
         and Newco, of even date herewith, attached hereto in Schedule 1.

         "Elan  Patents" shall mean any and all rights under any and all patents
         applications  and/or  patents,  now  existing,   currently  pending  or
         hereafter  filed  or  obtained  by  Elan  relating  to  Nanocrystal(TM)
         Technology  as set forth in Schedule 1 of the Elan  License  Agreement,
         and   any   foreign   counterparts   thereof   and   all   divisionals,
         continuations,  continuations-in-part, any foreign counterparts thereof
         and all patents  issuing on, any of the  foregoing,  together  with all
         registrations, reissues, re-examinations or extensions thereof.

         "Encumbrance" shall mean any liens,  charges,  encumbrances,  equities,
         claims, options, proxies, pledges, security interests, or other similar
         rights of any nature.

         "EPIL Patents" shall mean the Elan Patents owned by EPIL.

         "Exchange  Act"  shall mean the  Securities  Exchange  Act of 1934,  as
         amended.

         "Exchange  Note" shall mean  promissory  notes  issued by  Sheffield to
         holders of the Series D Preferred Stock in exchange for share of Series
         D Preferred Stock pursuant to the Certificate of Designations.

         "Exchange  Right" shall mean the Equity Exchange Right (as such term is
         defined  in the  Certificate  of  Designations  in  effect  on the date
         hereof.)

         "Field A" shall mean the topical pulmonary  delivery of Formulations of
         the Field A Compound by means of the Field A Device.

         "Field B" shall mean the topical pulmonary  delivery of Formulations of
         the Field B Compound by means of the Field B Device.

         "Field C" shall mean the topical pulmonary  delivery of Formulations of
         the Field C Compound by means of the Field C Device.

         "Field A Device" shall mean a third party table top unit dose nebulizer
         having a  reservoir  capable  of  holding a unit  dose (a device  and a
         compressor to nebulize a unit dose shall be deemed a device),  which is
         a device having any one the following characteristics:

         (i)       [REDACTED]

         (ii)      [REDACTED]

         (iii)     [REDACTED]

                                      -4-
<PAGE>

         (iv)  [REDACTED]

         (v)   [REDACTED]

         For the avoidance of doubt, Field A Device does not include [REDACTED]

         "Field B Device" shall mean the Aerosol Drug Delivery System  ("ADDS"),
         owned by Systemic Pulmonary  Delivery Limited and exclusively  licensed
         to Sheffield for topical pulmonary applications.

         "Field C Device" shall mean the handheld  multi-dose  nebulizer ("MSI")
         which was licensed  exclusively by Siemens to Sheffield pursuant to the
         Siemens Agreements and which was subsequently sub-licensed by Sheffield
         to Zambon (on an exclusive basis for delivery of various  medicines for
         humans in  treating  respiratory  disease  and/or  other lung  diseases
         including,  but not limited to,  anti-infectives)  provided that Newco,
         through  the  Management  Committee,   is  successful  in  obtaining  a
         sub-license  from Zambon to Newco enabling the  development  and use of
         the Field C Compounds  for use with a Field C Device,  as  described in
         more detail in Clause 2.2 of the Elan License.

         "Field A Compound" shall mean [REDACTED.]

         "Field B Compound"  shall mean  [REDACTED]  for  therapeutic  use to be
         nominated by the Management  Committee pursuant to Clause 2.3, and with
         reference to Clause 2.3, any Substitute Field B Compound.

         "Field C Compound"  shall mean  [REDACTED] and with reference to Clause
         2.4, any  Substitute  Field C Compound  and/or any  Additional  Field C
         Compound".

         "Field A  Products"  shall  mean  Formulations  of the Field A Compound
         delivered by means of any Field A Device in Field A.

         "Field B  Products"  shall  mean  Formulations  of the Field B Compound
         delivered by means of the Field B Device in Field B.

         "Field C  Products"  shall  mean  Formulations  of the Field C Compound
         delivered by means of the Field C Device in Field C.

         "Financial  Year" shall mean each year  commencing  on January 1 (or in
         the case of the first  Financial Year, the date hereof) and expiring on
         December 31 of each year.

         "Formulations"  shall mean Nanocrystal(TM)  Technology  formulations of
         Compounds for use in Field A, Field B or Field C, as applicable.

                                      -5-
<PAGE>
         "Fully  Diluted  Common  Stock"  shall  mean  all  of  the  issued  and
         outstanding Common Stock, assuming the conversion, exercise or exchange
         of all outstanding Common Stock Equivalents.

         "Funding  Agreement" shall mean the Funding Agreement,  dated as of the
         date hereof, between EIS and Sheffield.

         "License  Agreements"  shall mean the Elan  License  Agreement  and the
         Sheffield License Agreement.

         "Licensed Technologies" shall mean, collectively, the Elan Intellectual
         Property and the Sheffield Intellectual Property.

         "Nanocrystal(TM) Technology" shall mean the Elan proprietary technology
         directed  to  nanoparticulate  formulations  of  compounds  used in the
         manufacturing  and/or  formulation  process,  and methods of making the
         same.

         "Newco By-Laws" shall mean the By-Laws of Newco.

         "Newco  Intellectual  Property"  shall  mean  all  rights  to  patents,
         know-how and other intellectual  property arising out of the conduct of
         the Project by any person,  including any technology  acquired by Newco
         from a third party, that does not constitute Elan Intellectual Property
         or Sheffield Intellectual Property.

         "Newco Patents" shall mean any and all patents now existing,  currently
         pending  or  hereafter   filed  or  obtained   relating  to  the  Newco
         Intellectual  Property,  and any foreign  counterparts  thereof and all
         divisionals,   continuations,    continuations-in-part,   any   foreign
         counterparts  thereof and all patents issuing on, any of the foregoing,
         together  with  all   registrations,   reissues,   re-examinations   or
         extensions thereof.

         "Participant"  shall mean  Sheffield  or Elan,  as the case may be, and
         "Participants"  shall  mean both  Sheffield  and Elan  together  as the
         context requires.

         "Party" shall mean Elan,  Sheffield,  or Newco, as the case may be, and
         "Parties" shall mean all three together.

         "Permitted  Transferee" shall mean any Affiliate or subsidiary of Elan,
         EIS or Sheffield,  to whom this Agreement may be assigned,  in whole or
         in part,  pursuant to the terms  hereof or in the case of  Elan/EIS,  a
         special purpose  financing  entity created by Elan or EIS provided such
         are not competitors of Sheffield.

         "Person" shall mean an individual,  partnership,  corporation,  limited
         liability  company,   business  trust,  joint  stock  company,   trust,
         unincorporated  association,  joint  venture,  governmental  entity  or
         authority or other entity of whatever nature.

                                      -6-
<PAGE>

         "Products" shall mean the Field A Products, the Field B Products and/or
         the Field C Products.

         "Project"  shall mean all  activities  as undertaken by or on behalf of
         Newco in order to develop the Products.

         "Registration  Rights  Agreements"  shall mean the Registration  Rights
         Agreements of even date herewith  relating to the common shares and the
         common stock of Newco and Sheffield, respectively.

         "Regulatory  Application" shall mean any regulatory  application or any
         other  application  for marketing  approval for a Product,  which Newco
         will file in any country of the Territory, including any supplements or
         amendments thereto.

         "Regulatory Approval" shall mean the final approval to market a Product
         in any  country  of the  Territory,  and any  other  approval  which is
         required to launch the Product in the normal course of business.

         "Research and Development  Term" shall refer to the period of time from
         the date hereof until the third anniversary of the date hereof.

         "RHA" shall mean any relevant government health authority (or successor
         agency  thereof)  in any  country of the  Territory  whose  approval is
         necessary to market a Product in the relevant country of the Territory.

         "R&D Program" shall mean any research and development program commenced
         by Newco pursuant to the Project.

         "R&D Plan" shall mean the program of work, including the budget, agreed
         by the  Management  Committee as part of the Business Plan that relates
         to the formulation,  biopharmaceutical  and clinical development of the
         Products  and such  further  research  and  development  work as may be
         agreed by the Management Committee from time to time.

         "Securities  Act" shall mean the United States  Securities Act of 1933,
         as amended.

         "Series  D  Preferred   Stock"  shall  mean  the  Series  D  Cumulative
         Convertible  Exchangeable Preferred Stock, par value $.01 per share, of
         Sheffield.

         "Shares"  shall  mean the  shares  of Common  Stock  and the  shares of
         Preferred Stock issued or issuable (directly or upon conversion) to the
         Participants pursuant to this Agreement or the Newco Bye-Laws.

         "Sheffield"   shall  mean  Sheffield   Pharmaceuticals,   Inc  and  its
         Affiliates.

         "Sheffield  Devices"  shall  mean the  Field B Device  and the  Field C
         Device.

                                      -7-
<PAGE>

         "Sheffield Directors" has the meaning set forth in Clause 5.

         "Sheffield  Improvements"  shall  mean  improvements  relating  to  the
         Sheffield  Patents  and/or the  Sheffield  Know-How,  developed  (i) by
         Sheffield whether or not pursuant to the Project, (ii) by Newco or Elan
         or by a third party (under contract with Newco) whether or not pursuant
         to the Project,  and/or (iii) jointly by any  combination of Sheffield,
         Elan or Newco pursuant to the Project,  except as limited by agreements
         with third Parties.

         Subject  to  third  party  agreements,   Sheffield  Improvements  shall
         constitute part of Sheffield  Intellectual  Property and be included in
         the license of the Sheffield  Intellectual  Property pursuant to Clause
         2.1 of the Sheffield License solely for the purposes set forth therein.
         If the inclusion of a Sheffield Improvement in the license of Sheffield
         Intellectual  Property  is  restricted  or  limited  by a  third  party
         agreement,   Sheffield  shall  use  reasonable  commercial  efforts  to
         minimize any such restriction or limitation.

         "Sheffield  Intellectual  Property" shall mean the Sheffield  Know-How,
         the Sheffield Patents and the Sheffield Improvements.

         "Sheffield  Know-How" shall mean any and all rights owned,  licensed or
         controlled by Sheffield to any discovery, invention (whether patentable
         or not), know-how,  substances, data, techniques,  processes,  systems,
         formulations and designs relating exclusively to the Sheffield Devices.

         "Sheffield  License Agreement" shall mean the license agreement between
         Sheffield and Newco, of even date herewith, attached hereto in Schedule
         2.

         "Sheffield  Patents"  shall mean any and all  rights  under any and all
         patents applications and/or patents, now existing, currently pending or
         hereafter  filed or obtained  by  Sheffield  relating to the  Sheffield
         Devices and all divisionals, continuations,  continuations-in-part, any
         foreign  counterparts  thereof and all  patents  issuing on, any of the
         foregoing, together with all registrations,  reissues,  re-examinations
         or extensions thereof.

         "Sheffield  Securities  Purchase  Agreement"  shall  mean that  certain
         Securities  Purchase Agreement,  of even date herewith,  by and between
         Sheffield and EIS.

         "Siemens" shall mean Siemens Aktiengesellschaft.

         "Siemens  Agreements"  shall mean the License  Agreement  (as  amended)
         dated 21 March 1997 and the Basic Supply Agreement dated 21 March 1997,
         both  between   Sheffield   Medical   Technologies   Inc.  and  Siemens
         Aktiengesellschaft.

         "Stockholder"  shall  mean  any  of  EIS,   Sheffield,   any  Permitted
         Transferee or any other Person who  subsequently  becomes bound by this
         Agreement as a holder of the Shares, and

         "Stockholders" shall mean all of the Stockholders together.

                                      -8-

<PAGE>

         "Subsidiary"  shall  mean any  company  that is a  subsidiary  of Newco
         within the meaning of applicable laws.

         "Technological Competitor of Elan" shall mean a company, corporation or
         person listed in Schedule 3 and  successors  thereof or any  additional
         broad-based  technological  competitor of Elan added to such Schedule 3
         from time to time upon mutual agreement of the Parties

         "Technological   Competitor  of   Sheffield"   shall  mean  a  company,
         corporation  or person listed in Schedule 4 and  successors  thereof or
         any additional broad-based  technological competitor of Sheffield added
         to such  Schedule  4 from time to time  upon  mutual  agreement  of the
         Parties.

         "Term" shall mean the term of this Agreement.

         "Territory" shall mean all of the countries of the world.

         "Transaction   Documents"  shall  mean  this  Agreement,   the  Funding
         Agreement, the Elan License Agreement, the Sheffield License Agreement,
         the Sheffield  Securities Purchase  Agreement,  the Exchange Notes, the
         Dividend Notes, the Registration Rights Agreements,  the Certificate of
         Designations and associated documentation of even date herewith, by and
         between Sheffield, Elan, EIS and Newco, as applicable.

         "United States Dollar" and "US$" and "$" shall mean the lawful currency
         of the United States of America.

         "Zambon" shall mean Inpharzam International, S.A..

         "Zambon Agreement" shall mean the agreement dated June 15, 1998 between
         Sheffield and Zambon.

1.2      In addition, the following definitions have the meanings in the Clauses
         corresponding thereto, as set forth below.

         Definition                           Clause

         "AAA"                                20.6
         "Buyout Option"                      20.4
         "Closing"                            4.3
         "Common Stock"                       Recital
         "Confidential Information"           22.1
         "Co-sale Notice"                     17.4
         "Expert"                             19.3
         "Management Committee"               5.2.1
         "Notice of Exercise"                 17.3
         "Notice of Intention"                17.3


                                      -9-
<PAGE>

         "Offered Shares"                     17.3
         "Offer Price"                        17.3
         "Preferred Stock"                    Recital
         "Proposing Participant"              20.4
         "Proposing Participant Price"        20.6
         "Purchase Price"                     20.6
         "R&D Committee"                      5.2.3
         "Recipient Participant"              20.4
         "Recipient Participant Price"        20.6
         "Remaining Stockholders"             17.4
         "Relevant Event"                     20.2
         "Selling Stockholder"                17.3
         "Tag-Along Right"                    17.4
         "Transaction Proposal"               17.3
         "Transfer"                           17.1
         "Transferee Terms"                   17.4
         "Transferring Stockholder"           17.4

1.3      Words importing the singular shall include the plural and vice versa.

1.4      Unless the context otherwise requires, reference to a recital, article,
         paragraph,  provision,  clause or  schedule  is to a recital,  article,
         paragraph, provision, clause or schedule of or to this Agreement.

1.5      Reference to a statute or statutory  provision  includes a reference to
         it as from time to time amended, extended or re-enacted.

1.6      The headings in this Agreement are inserted for convenience only and do
         not affect its construction.

1.7      Unless the context or subject otherwise  requires,  references to words
         in one gender include references to the other genders.

1.8      Capitalized  terms used but not defined  herein shall have the meanings
         ascribed in the Transaction Documents, if defined therein.


                                    CLAUSE 2

                                    BUSINESS

2.1      This Agreement shall regulate the business of the development, testing,
         registration, manufacture,  commercialization and licensing of Products
         in the  Territory and to achieve the other  objectives  set out in this
         Agreement. The focus of the Business will be to develop the Products in
         the Combined Fields  (subject to the provisions  outlined in Clause 2.3
         and Clause 2.4 of this

                                      -10-
<PAGE>

         Agreement  and  Clause  1 of the  Funding  Agreement)  using  the  Elan
         Intellectual  Property,  the  Sheffield  Intellectual  Property and the
         Newco   Intellectual   Property  to  agreed  upon   specifications  and
         timelines.

2.2      The  central  management  and control of Newco  shall be  exercised  in
         Bermuda and shall be vested in the  Directors  and such Persons as they
         may delegate the exercise of their powers in accordance  with the Newco
         By-Laws.  The  Stockholders  shall use their best  endeavors to ensure
         that to the extent  required  pursuant to the laws of  Bermuda,  and to
         ensure the sole  residence  of Newco in  Bermuda,  all  meetings of the
         Directors are held in Bermuda or other jurisdictions outside the United
         States and  generally  to ensure that Newco is treated as resident  for
         taxation purposes in Bermuda.

2.3      Nomination procedures in Field B

         The Management Committee shall nominate the Field B Compound as soon as
         practicable  following the Effective  Date provided that the Management
         Committee shall in no circumstances be entitled to nominate  [REDACTED]
         as the Field B Compound without the prior consent in writing of Elan.

         Upon nomination of the Field B Compound,  the R&D Committee shall carry
         out, or have  carried out on its behalf by a third party  agreed by the
         R&D  Committee,  a feasibility  study ("Field B Feasibility  Study") to
         determine the feasibility of the Field B Compound  initially  nominated
         for an R&D Program in Field B.

         Subject  to Clause 6.3 and Clause 1 of the  Funding  Agreement,  if the
         Management  Committee  is  satisfied  with the  results  of the Field B
         Feasibility  Study, the Management  Committee will consider whether and
         when Newco will  commence  an R&D  Program in Field B with such Field B
         Compound  having regard to the other R&D Programs  being  undertaken by
         Newco and the personnel resources and funding which Newco has allocated
         thereto.  If the  Management  Committee  determines  that such  Field B
         Compound represents a more valuable opportunity for Newco than Field A,
         the


                                      -11-
<PAGE>

         Management Committee,  to the extent necessary,  will re-prioritize any
         R&D Program(s) already commenced in Field A or proposed to be commenced
         by Newco in such Field.

         If the  Management  Committee is not satisfied  with the results of the
         Field B Feasibility Study, no R&D Program will be commenced by Newco in
         respect of such  Field B Compound  and the  Management  Committee  will
         nominate a substitute  [REDACTED] for  therapeutic  use in Field B (the
         "Substitute Field B Compound")  (provided that the Management Committee
         shall in no  circumstances  be entitled to nominate  [REDACTED]  as the
         Field B Compound  without  the prior  consent in writing of Elan) which
         will be  subject  to a new  Field B  Feasibility  Study  and all  other
         applicable provisions of this Clause 2.3.

         Prior to Newco  commencing  any R&D Program in Field B with the Field B
         Compound,  or the  Substitute  Field  B  Compound,  the  Parties  shall
         negotiate in good faith such amendments as are required to the Licenses
         and/or the  Development  Agreement,  such as  amending  the  provisions
         regulating non-competition.

         The  Management  Committee  shall not be entitled to nominate more than
         one Substitute Field B Compound hereunder.

         With reference to Clause 6.3 and Clause 1 of the Funding Agreement,  in
         the event that  either  Elan or  Sheffield  determines  not to fund any
         amounts  required  for an R&D  Program in Field B, but the other  Party
         desires  to fund such R&D  Program  in Field B, the Party  desiring  to
         continue such funding shall be entitled to enter into an agreement with
         Newco to obtain the  relevant  R&D Program in Field B from Newco and to
         enter into any necessary  license  agreements  with Newco which will be
         negotiated  in good faith with Newco and based on the then current fair
         market value of such R&D Program in Field B and other customary terms.

2.4      Nomination procedures in Field C

         As provided in Clause 2.2 of the Elan  License  Agreement,  on the date
         which is [REDACTED] days following the Effective Date, or such extended
         date as may be agreed in writing by Elan and Newco,  Elan shall, at its
         sole  discretion,  be entitled  forthwith to  terminate  the license to
         Newco  described  in Clause 2.1.3 of the Elan  License,  upon notice in
         writing to Newco,  in the event that Newco has not, prior to such date,
         executed a written sub-license with Zambon for the development by Newco
         of the Field C Formulation in Field C.

         Prior to the execution by Newco of the written sub-license with Zambon,
         as described herein, within the period specified herein, the Management
         Committee  will  consider  whether and when Newco will  commence an R&D
         Program  in Field C having  regard  to the  other  R&D  Programs  being
         undertaken  by  Newco  and the  personnel  resources  which  Newco  has
         allocated  thereto  and the  funding  available  from  Zambon  for such
         proposed R&D Program.

         If Newco  commences an R&D Program in Field C with the Field C Compound
         under this Clause 2.4 and such R&D Program is  subsequently  terminated
         by the Management Committee within one year of commencement because the
         Field C Compound cannot be



                                      -12-
<PAGE>

         formulated  in a manner  suitable for delivery with the Field C Device,
         the  Management  Committee will consider the nomination of a substitute
         [REDACTED] in Field C (the "Substitute Field C Compound").

         After a period of 1 year following the later of the  commencement  date
         of the R&D Program  commenced  by Newco for the Field C Compound or the
         Substitute  Field C Compound,  on a semi-annual  basis,  the Management
         Committee  will  consider  whether it should  nominate and consider one
         additional [REDACTED] in Field C ("Additional Field C Compound") for an
         one  additional  R&D Program in Field C having  regard to the other R&D
         Programs  being  undertaken  by Newco and the  personnel  resources and
         funding  which Newco has  allocated  thereto and the funding  available
         from Zambon for such an additional R&D Program.

         Prior to Newco  commencing any R&D Program in Field C with a Substitute
         Field C Compound or with an  Additional  Field C Compound,  the Parties
         shall  negotiate in good faith such  amendments  as are required to the
         Licenses  and/or  the  Development  Agreement,  such  as  amending  the
         provisions  regulating  non-competition  and  as  are  required  to the
         agreement between Newco and Zambon described herein (assuming that such
         agreement has been executed in accordance with the provisions hereof).


                                    CLAUSE 3

                         REPRESENTATIONS AND WARRANTIES

3.1      Representations  and Warranties of Newco:  Newco hereby  represents and
         warrants to each of the Stockholders as follows, as of the date hereof:


         3.1.1   Organization:  Newco is an  exempted  company  duly  organized,
                 validly  existing  and in  good  standing  under  the  laws  of
                 Bermuda,   and  has  all  the  requisite  corporate  power  and
                 authority  to own and  lease  its  properties,  to carry on its
                 business  as  presently   conducted   and  as  proposed  to  be
                 conducted.

         3.1.2   Capitalization:  As of the date hereof,  the authorized capital
                 stock of Newco  consists of 12,000  shares of Common  Stock and
                 12,000 shares of Preferred Stock.  Prior to the date hereof, no
                 shares of capital stock of Newco have been issued.

         3.1.3   Authorization: The execution, delivery and performance by Newco
                 of this Agreement,  including the issuance of the Shares,  have
                 been duly authorized by all requisite  corporate actions;  this
                 Agreement  has been duly executed and delivered by Newco and is
                 the valid and binding obligation of Newco,  enforceable against
                 it in accordance with its terms except as limited by applicable
                 bankruptcy,  insolvency,  reorganization,  moratorium and other
                 laws  of  general  application  affecting  the  enforcement  of
                 creditors'  rights  generally,  and  except as  enforcement  of
                 rights to indemnity and  contribution  hereunder may be limited
                 by United States federal or state securities laws or principles
                 of public  policy.  The  Shares,  when  issued as


                                      -13-

<PAGE>
                 contemplated  hereby or in the Newco By-Laws,  will be validly
                 issued and outstanding,  fully paid and  non-assessable and not
                 subject  to  preemptive  or any  other  similar  rights  of the
                 Stockholders or others.

         3.1.4   No Conflicts: The execution,  delivery and performance by Newco
                 of this  Agreement,  the  issuance,  sale and  delivery  of the
                 Shares,  and compliance  with the  provisions  hereof by Newco,
                 will not:

                 (i)       violate any  provision  of  applicable  Bermuda  law,
                           statute,  rule or  regulation  applicable to Newco or
                           any  ruling,  writ,  injunction,  order,  judgment or
                           decree  of  any  court,  arbitrator,   administrative
                           agency or other governmental body applicable to Newco
                           or any of its properties or assets;

                 (ii)      conflict  with or result in any  breach of any of the
                           terms,  conditions  or  provisions  of, or constitute
                           (with  notice or lapse of time or both) a default (or
                           give rise to any right of  termination,  cancellation
                           or acceleration)  under its charter or organizational
                           documents or any material  contract to which Newco is
                           a party,  except  where such  violation,  conflict or
                           breach would not,  individually  or in the aggregate,
                           have a material adverse effect on Newco; or

                 (iii)     result in the creation of, any  Encumbrance  upon any
                           of the properties or assets of Newco.

         3.1.5   Approvals:  As of the date  hereof,  no permit,  authorization,
                 consent or approval of or by, or any  notification of or filing
                 with, any Person is required in connection  with the execution,
                 delivery or performance  of this Agreement by Newco.  Newco has
                 full authority to conduct its business as  contemplated  in the
                 Business Plan and the Transaction Documents.

         3.1.6   Disclosure:   This   Agreement  does  not  contain  any  untrue
                 statement of a material fact or omit to state any material fact
                 necessary  to  make  the   statements   contained   herein  not
                 misleading.  Newco is not  aware of any  material  contingency,
                 event or  circumstance  relating to its business or  prospects,
                 which could have a material  adverse effect  thereon,  in order
                 for  the  disclosure   herein  relating  to  Newco  not  to  be
                 misleading in any material respect.

         3.1.7   No  Business;  No  Liabilities:  Newco  has not  conducted  any
                 business or incurred any  liabilities or  obligations  prior to
                 the  date  hereof,   except  solely  in  connection   with  its
                 organization and formation.

         3.2     Representations and Warranties of the Stockholders: Each of the
                 Stockholders hereby severally  represents and warrants to Newco
                 as follows as of the date hereof:

                 3.2.1     Organization:  Such Stockholder is a corporation duly
                           organized and validly  existing under the laws of its
                           jurisdiction   of   organization   and  has  all  the
                           requisite  corporate  power and  authority to own and
                           lease  its  respective  properties,  to  carry on its
                           respective  business as  presently  conducted  and as
                           proposed  to  be  conducted  and  to  carry  out  the
                           transactions contemplated hereby.

                 3.2.2     Authority:  Such  Stockholder  has full legal  right,
                           power and authority to enter into this  Agreement and
                           to perform its obligations hereunder, which have been
                           duly  authorized by all requisite  corporate  action.
                           This Agreement is the valid and binding obligation of
                           such   Stockholder,   enforceable   against   it   in
                           accordance  with  its  terms  except  as  limited  by
                           applicable  bankruptcy,  insolvency,  reorganization,
                           moratorium  and  other  laws of  general  application
                           affecting  the   enforcement  of  creditors'   rights
                           generally,  and  except as  enforcement  of rights to
                           indemnity and  contribution  hereunder may be limited
                           by United States federal or state  securities laws or
                           principles of public policy.

                 3.2.3     No Conflicts: The execution, delivery and performance
                           by such  Stockholder of this  Agreement,  purchase of
                           the Shares, and compliance with the provisions hereof
                           by such Stockholder will not:

                           (i)    violate  any  provision  of  applicable   law,
                                  statute,  rule  or  regulation  known  by  and
                                  applicable to such  Stockholder or any ruling,
                                  writ, injunction, order, judgment or decree of
                                  any court,  arbitrator,  administrative agency
                                  or other  governmental body applicable to such
                                  Stockholder   or  any  of  its  properties  or
                                  assets;

                           (ii)   conflict  with or result in any  breach of any
                                  of the terms,  conditions or provisions of, or
                                  constitute  (with  notice  or lapse of time or
                                  both) a default  (or give rise to any right of
                                  termination,   cancellation  or  acceleration)
                                  under the charter or organizational  documents
                                  of such  Stockholder or any material  contract
                                  to which such  Stockholder is a party,  except
                                  where such violation, conflict or breach would
                                  not, individually or in the aggregate,  have a
                                  material  adverse effect on such  Stockholder;
                                  or

                           (iii)  result in the  creation  of,  any  Encumbrance
                                  upon any of the  properties  or assets of such
                                  Stockholder.

                 3.2.4     Approvals:   As  of  the  date  hereof,   no  permit,
                           authorization,  consent or  approval of or by, or any
                           notification   of  or  filing  with,  any  Person  is
                           required in connection  with the execution,  delivery
                           or performance of this Agreement by such Stockholder.

                 3.2.5     Investment   Representations:   Such  Stockholder  is
                           sophisticated   in  transactions  of  this  type  and
                           capable  of  evaluating  the  merits and risks of its
                           investment in Newco.  Such  Stockholder  has not been
                           formed   solely  for  the   purpose  of  making  this
                           investment  and such  Stockholder  is  acquiring  the
                           Common Stock and/or  Preferred  Stock for  investment
                           for its own account,  not as a nominee or agent,  and
                           not with the view to,  or for  resale  in  connection
                           with,  any  distribution  of any part  thereof.  Such
                                      -15-

<PAGE>

                           Stockholder understands that the Shares have not been
                           registered  under the  Securities  Act or  applicable
                           state  and  foreign  securities  laws by  reason of a
                           specific  exemption from the registration  provisions
                           of  the  Securities  Act  and  applicable  state  and
                           foreign  securities  laws, the  availability of which
                           depends  upon,  among  other  things,  the bona  fide
                           nature of the  investment  intent and the accuracy of
                           such   Stockholders'   representations  as  expressed
                           herein.  Such Stockholder  understands that no public
                           market  now  exists  for any of the  Shares  and that
                           there is no assurance  that a public market will ever
                           exist for such Shares.

                                    CLAUSE 4

                            AUTHORIZATION AND CLOSING


4.1      Newco  has  authorized  the  issuance  to (i) EIS of  4,776  shares  of
         Preferred Stock and (ii) Sheffield of 12,000 shares of Common Stock and
         7,224  shares of  Preferred  Stock,  issuable as provided in Clause 4.3
         hereof.

4.2      Sheffield  and EIS hereby  subscribe for the number of Shares set forth
         in Clause 4.1 and shall pay to the Newco in consideration  therefor, by
         wire  transfer  of  immediately  available  funds  (to a  bank  account
         established by Newco in connection with  Completion)  the  subscription
         amounts each as provided in Clause 4.4.1.

4.3      The closing  (the  "Closing")  shall take place at the offices of Brock
         Silverstein  LLC at 800 Third Avenue,  New York,  New York 10022 on the
         date  hereof or such other  places if any, as the Parties may agree and
         shall  occur  contemporaneously  with the closing  under the  Sheffield
         Securities Purchase Agreement.

4.4      At the Closing,  each of the Stockholders  shall take or (to the extent
         within its powers) cause to be taken the  following  steps at directors
         and  shareholder  meetings  of the  Newco,  or such other  meetings  or
         locations, as appropriate:

         4.4.1    Newco shall issue and sell to EIS, and EIS shall purchase from
                  Newco,  upon the terms and subject to the conditions set forth
                  herein,  4,776  shares of  Preferred  Stock  for an  aggregate
                  purchase  price of  $2,985,000  Newco  shall issue and sell to
                  Sheffield,  and Sheffield shall purchase from Newco,  upon the
                  terms and  conditions  set forth herein,  (i) 12,000 shares of
                  Common Stock for an aggregate purchase price of $7,500,000 and
                  (ii) 7,224 shares of Preferred Stock for an aggregate purchase
                  price of $4,515,000;

         4.4.2    the  Parties  shall  execute  and  deliver to each  other,  as
                  applicable,  certificates  in respect of the Common  Stock and
                  Preferred Stock  described  above and any other  certificates,
                  resolutions  or documents  which the Parties shall  reasonably
                  require;


                                      -16-
<PAGE>

         4.4.3.   the adoption by the Newco of Newco's By-Laws;

         4.4.4.   the appointment of Kevin Insley, Loren G. Peterson, and Thomas
                  M. Fitzgerald as Directors of Newco; and

         4.4.5.   the  resignation  of all  directors and the secretary of Newco
                  holding  office prior to the  execution of this  Agreement and
                  delivery of written  confirmation under seal by each Person so
                  resigning  that he has no claim or  right  of  action  against
                  Newco and that Newco is not in any way  obligated  or indebted
                  to him.

4.5      Exemption from Registration:

         The  Shares  will be  issued  under an  exemption  or  exemptions  from
         registration  under the Securities Act.  Accordingly,  the certificates
         evidencing  the Shares  shall,  upon  issuance,  contain the  following
         legend:

         THE SECURITIES  REPRESENTED  HEREBY HAVE NOT BEEN  REGISTERED
         UNDER  THE  SECURITIES  ACT  OF  1933,  AS  AMENDED,  OR  ANY
         SECURITIES LAWS OF A STATE OR OTHER  JURISDICTION AND MAY NOT
         UNDER ANY  CIRCUMSTANCES BE SOLD,  TRANSFERRED,  OR OTHERWISE
         DISPOSED OF EXCEPT PURSUANT TO (i) AN EFFECTIVE  REGISTRATION
         STATEMENT  UNDER THE SECURITIES ACT AND ANY APPLICABLE  STATE
         SECURITIES OR BLUE SKY LAWS,  (ii) TO THE EXTENT  APPLICABLE,
         RULE 144 UNDER THE  SECURITIES ACT (OR ANY SIMILAR RULE UNDER
         THE SECURITIES ACT RELATING TO THE DISPOSITION OF SECURITIES)
         OR ANY OTHER  AVAILABLE  EXCEPTION TO OR  EXEMPTION  FROM THE
         REGISTRATION  REQUIREMENTS  OF SUCH  ACT  AND ANY  APPLICABLE
         STATE  SECURITIES OR BLUE SKY LAWS,  TOGETHER WITH AN OPINION
         OF COUNSEL  REASONABLY  SATISFACTORY TO THE CORPORATION  THAT
         REGISTRATION  IS NOT  REQUIRED  UNDER SUCH ACT OR  APPLICABLE
         STATE SECURITIES LAWS.

4.6.     Newco shall use  reasonable  efforts to file any documents that require
         filing with the Registrar of Companies in Bermuda within the prescribed
         time  limits.   EIS  and  Sheffield   shall   provide  all   reasonable
         co-operation  to Newco in  relation  to the  matters  set forth in this
         Clause 4.6.

4.7.     In the event that EIS exercises the Exchange  Right prior to the second
         anniversary  of the Closing Date and  Sheffield is required to transfer
         to EIS any  shares  of  Common  Stock  (in  addition  to the  shares of
         Preferred Stock otherwise transferable),  Newco shall, immediately upon
         such exercise, take all necessary steps to ensure that each share to be
         transferred by Sheffield to EIS upon the exercise of the Exchange Right
         is a duly and validly  issued share



                                      -17-
<PAGE>

         of Preferred  Stock  (including  the  conversion of existing  shares of
         Common  Stock held by  Sheffield  prior to the exercise of the Exchange
         Right for newly created  shares of Preferred  Stock for purposes of the
         exercise  of the  Exchange  Right)  and that EIS shall  have full legal
         right,  title and  interest  in and to such shares of  Preferred  Stock
         thereby  exchanged.  All shares of Newco capital stock  transferred  by
         Sheffield  to EIS upon  exercise  of the  Exchange  Right  prior to the
         second  anniversary  of the Closing  Date shall be (or pursuant to this
         clause 4.7,  shall be  converted  from common into) shares of Preferred
         Stock.


                                    CLAUSE 5

                    DIRECTORS; MANAGEMENT AND R&D COMMITTEES

5.1.     Directors:

         Prior  to the  exercise  of the  Exchange  Right,  the  Board  shall be
         composed of three Directors. Sheffield shall have the right to nominate
         two directors of Newco  ("Sheffield  Directors") and EIS shall have the
         right to  nominate  one  Director  of  Newco  ("EIS  Director"),  which
         Director,  save as further provided  herein,  shall only be entitled to
         15% of the votes of the Board.  To the extent  required  by  applicable
         Bermuda  law,  in the event that the EIS  Director is not a resident of
         Bermuda, at least one of the Sheffield Directors shall be a resident of
         Bermuda. Sheffield may appoint one of the Sheffield Directors to be the
         chairman of Newco. In the event that the Exchange Right is exercised by
         EIS within 2 years  following the Closing Date,  the EIS Director shall
         only be entitled to 15% of the votes of the Board until the expiry of 2
         years from the Closing Date.

         In the event that the  Exchange  Right is  exercised by EIS at any time
         after two years  following  the  Closing  Date or upon the  expiry of 2
         years  following  the Closing  Date where the  Exchange  Right has been
         exercised by EIS within 2 years  following  the Closing  Date,  each of
         Sheffield,  and EIS shall cause the Board to be reconfigured so that an
         equal number of Directors are  designated by EIS and Sheffield and that
         each of the Directors has equal voting power.

         5.1.1   If EIS removes the EIS  Director,  or Sheffield  removes any of
                 the Sheffield Directors,  EIS or Sheffield, as the case may be,
                 shall indemnify the other Stockholder against any claim by such
                 removed Director arising from such removal.

         5.1.2   The  Directors  shall  meet not less than  three  times in each
                 Financial  Year and Board  meetings shall be held in Bermuda to
                 the  extent  required  pursuant  to the laws of  Bermuda  or to
                 ensure the sole residence of Newco in Bermuda.

         5.1.3   At any such meeting,  the presence of at least one EIS Director
                 and at  least  one  Sheffield  Director  shall be  required  to
                 constitute  a quorum  and,  subject  to Clause 18  hereof,  the
                 affirmative  vote of a majority of the  Directors  present at a
                 meeting at which such a quorum is present  shall  constitute an
                 action  of the  Directors.  In the event of any  meeting  being

                                      -18-

<PAGE>

                 inquorate, the meeting shall be adjourned for a period of seven
                 days.  A notice  shall be sent to the EIS  Director(s)  and the
                 Sheffield  Directors  specifying the date, time and place where
                 such adjourned meeting is to be held and reconvened.

         5.1.4   The chairman of Newco shall hold office until the first meeting
                 of the Board after the exercise by EIS of the  Exchange  Right,
                 provided  that the  Exchange  Right is  exercised by EIS at any
                 time  after two years  from the date  hereof.  If the  Exchange
                 Right  is  exercised  by EIS  within  two  years  from the date
                 hereof, the chairman of Newco shall continue to hold office. If
                 the chairman is unable to attend any meeting of the Board,  the
                 Sheffield  Directors  shall  be  entitled  to  appoint  another
                 Director to act as chairman in his place at the meeting.  After
                 exercise  of the  Exchange  Right  by  EIS,  each  of  EIS  and
                 Sheffield,   beginning   with  EIS,   shall   have  the  right,
                 exercisable  alternatively,  of  nominating  one Director to be
                 chairman  of Newco for a term of one year.  If the  chairman of
                 Newco is unable to attend  any  meeting of the Board held after
                 the exercise of the Exchange Right by EIS, the Directors  shall
                 be entitled to appoint  another  Director to act as chairman of
                 Newco in his place at the meeting.

         5.1.5.  In case of an equality of votes at a meeting of the Board,  the
                 chairman  of Newco shall not be entitled to a second or casting
                 vote.  In the event of  continued  deadlock,  the  Board  shall
                 resolve the deadlock  pursuant to the  provisions  set forth in
                 Clause 19.

5.2      Management and R&D Committees:

         5.2.1   The Board shall appoint a management committee (the "Management
                 Committee") to consist  initially of four members,  two of whom
                 shall be  nominated  by Elan and two of whom shall be nominated
                 by  Sheffield,  and each of whom shall be entitled to one vote,
                 whether or not  present at any  Management  Committee  meeting.
                 Decisions of the Management Committee shall require approval of
                 at least one Elan nominee on the  Management  Committee and one
                 Sheffield nominee on the Management Committee.

         5.2.2   Each of Elan and  Sheffield  shall be entitled to remove any of
                 their  nominees  to the  Management  Committee  and  appoint  a
                 replacement in place of any nominees so removed.  The number of
                 members of the Management Committee may be altered if agreed to
                 by a majority of the Directors; provided that, each of Elan and
                 Sheffield  shall be  entitled  to  appoint  an equal  number of
                 members to the Management  Committee.  The Management Committee
                 shall be responsible  for, inter alia,  devising,  implementing
                 and reviewing strategy for the Project.

         5.2.3   The   Management   Committee   shall  appoint  a  research  and
                 development  committee  (the  "R&D  Committee"),   which  shall
                 initially be comprised  of four  members,  two of whom shall be
                 nominated  by Elan  and  two of  whom  shall  be  nominated  by
                 Sheffield, and each of whom shall have one vote, whether or not
                 present at an R&D Committee  meeting  during which research and
                 development   issues  are  discussed.   Decisions  of  the  R&D
                 Committee  shall require  approval of at least one Elan nominee

                                      -19-

<PAGE>

                 on the R&D  Committee  and  one  Sheffield  nominee  on the R&D
                 Committee.

         5.2.4   Each of Elan and  Sheffield  shall be entitled to remove any of
                 their  nominees to the R&D  Committee and appoint a replacement
                 in place of any  nominees so removed.  The number of members of
                 the R&D  Committee may be altered if agreed to by a majority of
                 the Directors provided that each of Elan and Sheffield shall be
                 entitled  to  appoint  an equal  number of  members  to the R&D
                 Committee.

         5.2.5   The  Management   Committee   shall  be  responsible   for  the
                 preparation  of the Business  Plan.  The  Management  Committee
                 shall  also  be  responsible   for  monitoring  and  conducting
                 periodic  reviews of Elan  Intellectual  Property and Sheffield
                 Intellectual Property.

         5.2.6   The R&D Committee shall be responsible for:-

                 (i)       designing  that  portion  of the  Business  Plan that
                           relates  to  the  Project  for  consideration  by the
                           Management Committee;

                 (ii)      establishing  a joint  Project team  consisting of an
                           equal number of team members from Elan and Sheffield,
                           including  one  Project  leader from each of Elan and
                           Sheffield; and

                 (iii)     implementing  such portion of the Business  Plan that
                           relates to the Project, as approved by the Management
                           Committee.

         5.2.7   In the event of any dispute amongst the R&D Committee,  the R&D
                 Committee shall refer such dispute to the Management  Committee
                 whose  decision  on the  dispute  shall be  binding  on the R&D
                 Committee.

                 If the Management  Committee cannot resolve the matter after 15
                 days or such  other  period as may be agreed by the  Management
                 Committee,  the dispute will be referred to a designated senior
                 officer of each of Elan and Sheffield,  and thereafter,  in the
                 event  of   continued   deadlock,   pursuant  to  the  deadlock
                 provisions to be set forth in Clause 19,  involving inter alia,
                 the referral of the dispute to an expert,  whose  decision will
                 be binding on the  Participants.  This process shall also apply
                 to any dispute within the Management Committee.

         5.2.8   Elan and  Sheffield  shall permit Newco or its duly  authorized
                 representative  on reasonable notice and at any reasonable time
                 during  normal  business  hours to have  access to inspect  and
                 audit the  accounts  and records of Elan or  Sheffield  and any
                 other book, record, voucher, receipt or invoice relating to the
                 calculation  or the cost of the R&D Program and to the accuracy
                 of the reports which  accompanied  them. Any such inspection of
                 Elan's or Sheffield's  records, as the case may be, shall be at
                 the expense of Newco, except that if such inspection reveals an
                 overpayment  in the amount  paid to Elan or  Sheffield,  as the

                                      -20-

<PAGE>

                 case may be, for the R&D  Program  hereunder  in any  Financial
                 Year of 5% or more of the amount due to Elan or  Sheffield,  as
                 the case may be, then the expense of such  inspection  shall be
                 borne solely by Elan or Sheffield,  as the case may be, instead
                 of by Newco. Any surplus over the sum properly payable by Newco
                 to  Elan or  Sheffield,  as the  case  may  be,  shall  be paid
                 promptly by Elan or Sheffield, as the case may be, to Newco. If
                 such  inspection  reveals  a deficit  in the  amount of the sum
                 properly  payable to Elan or Sheffield,  as the case may be, by
                 Newco, Newco shall pay the deficit to Elan or Sheffield, as the
                 case may be.

                                    CLAUSE 6

                          THE BUSINESS PLAN AND REVIEWS

6.1      The Directors  shall meet  together as soon as  reasonably  practicable
         after the  Closing  Date  hereof and shall  agree upon and  approve the
         Business Plan for the current  Financial Year within [REDACTED] days of
         the Closing Date.

6.2.     The  Business  Plan shall be  reviewed  and  mutually  agreed to by the
         unanimous approval of the EIS Director and the Sheffield Directors on a
         semi-annual basis.

6.3.     Neither Participant shall be obliged to provide funding to Newco in the
         absence  of  the  semi-annual  approval  of  the  Business  Plan  and a
         determination  by  each  Participant,  in  its  sole  discretion,  that
         Subsequent  Funding (as such term is defined in the Funding  Agreement)
         shall be provided for the development of the Products.

6.4.     Future  Business Plans prepared  pursuant to Clause 5 shall be reviewed
         and mutually agreed to by the EIS Director and the Sheffield Directors.

                                    CLAUSE 7

                          RESEARCH AND DEVELOPMENT WORK

7.1      Subject to Clause 6.3,  Elan and  Sheffield,  at Newco's  request,  may
         undertake  research and development work related to the development and
         commercialization  of the  Products,  at the  request  of Newco  and as
         articulated in the Business Plan, in furtherance of the development and
         commercialization  of the Products and cultivation of patent rights and
         know-how  related  to  the  Elan   Intellectual   Property,   Sheffield
         Intellectual Property and Newco Intellectual Property.

7.2      Elan and Sheffield shall use reasonable efforts in undertaking any such
         research and development work undertaken for Newco hereunder to conduct
         such research and development work in a professional and timely manner,
         in accordance with relevant RHA guidelines and regulations.


                                      -21-

<PAGE>

7.3      The cost of such development  work shall be Elan's and Sheffield's,  as
         the case may be,  fully-burdened  actual costs in respect thereof, plus
         [REDACTED]  of  such  costs.  Research  and  development  work  that is
         sub-contracted by Elan or Sheffield to third party providers and/or any
         other materials or other services purchased from a third party provider
         on Newco's behalf shall be charged by Elan or Sheffield to Newco at the
         amount invoiced by the relevant third party provider.


                                    CLAUSE 8

                                COMMERCIALIZATION

8.1      Newco shall diligently  pursue the research,  development,  prosecution
         and  commercialization  of the  Products,  as provided in the  Business
         Plan.

8.2      Subject to Clause 2 of the  Sheffield  License  Agreement,  at any time
         during the  development  of the  Products,  Newco  may,  subject to the
         Licenses and Clause 8.3,  license the marketing  rights to the Products
         to one or more  marketing  partners,  or  otherwise  commercialize  the
         Products  under an  alternative  strategy to be agreed upon by Elan and
         Sheffield.

8.3      Newco  shall  be  responsible  for   negotiating   with  third  Parties
         commercially  reasonable  terms  (including,   inter  alia,  royalties,
         milestones,  fees, profit sharing,  manufacturing rights, supply terms)
         for the  rights to be  granted,  but  shall do so under the  commercial
         strategy  agreed  with  Elan and  Sheffield  and  shall  keep  Elan and
         Sheffield informed throughout the negotiation process.


                                    CLAUSE 9

                        SUBLICENSE AND ASSIGNMENT RIGHTS

9.1      Newco shall not be permitted to assign,  license or  sublicense  any of
         its rights in respect of the Newco  Intellectual  Property  without the
         prior written  consent of Elan and Sheffield  which consent will not be
         unreasonably withheld or delayed; provided that:

         9.1.1    Elan shall in all cases, in its sole  discretion,  be entitled
                  to withhold  its consent in the case of a proposed  sublicense
                  to any Technological Competitor of Elan;

         9.1.2    Sheffield  shall  in all  cases,  in its sole  discretion,  be
                  entitled  to  withhold  its  consent in the case of a proposed
                  sublicense  to  any  Technological   Competitor  of  Sheffield
                  provided  that for the  avoidance of doubt,  this Clause 9.1.2
                  shall not impact in any way Elan's right to grant sub-licenses
                  of Newco Intellectual Property pursuant to Clause 12.

                                      -22-

<PAGE>

9.2      The  Parties  acknowledge  and agree to be bound by the  provisions  of
         Clause 2.7 of the Elan License  Agreement and the  provisions of Clause
         2.7 of the Sheffield  License  Agreement  which set forth the agreement
         between the Parties  thereto in relation to  sub-licensing  of the Elan
         Intellectual   Property  and  the   Sheffield   Intellectual   Property
         respectively.


                                    CLAUSE 10

            OWNERSHIP OF INTELLECTUAL PROPERTY RIGHTS/NON-COMPETITION

10.1.    The  Parties  acknowledge  and agree to be bound by the  provisions  of
         Clause  3.1  of  the  Elan  License  Agreement  and  Clause  3.1 of the
         Sheffield License Agreement set forth the agreement between the parties
         thereto in relation to the ownership of the Elan Intellectual Property,
         the Sheffield Intellectual Property and the Newco Intellectual property
         respectively.

10.2     The  Parties  acknowledge  and agree to be bound by the  provisions  of
         Clause 4 of the Elan License  Agreement and the  provisions of Clause 4
         of the  Sheffield  License  Agreement  which set  forth  the  agreement
         between  the  parties  thereto  in  relation  to  the   non-competition
         obligations of Elan and Sheffield, respectively.

                                    CLAUSE 11

                          INTELLECTUAL PROPERTY RIGHTS

11.1     Newco shall remain the owner of the Newco Intellectual Property.

         11.1.1   Each  Party  shall  be   responsible   for  the   preparation,
                  prosecution  and  maintenance of all patent  applications  and
                  issued  patents  relating  to its own  intellectual  property.
                  Prior  to  filing  for  any  patent  protection  on any  Newco
                  Intellectual  Property,  Newco shall inform Elan and Sheffield
                  of its intention to do so.

         11.1.2   Upon  request,  Elan or Sheffield  shall  provide  information
                  regarding its activities set forth in 11.1.1.

11.2     Enforcement of Intellectual Property Rights; third party infringement

         11.2.1   Sheffield,  Newco and Elan shall promptly  inform the other in
                  writing of any alleged  infringement  or  unauthorized  use of
                  which  it  shall  become  aware  by a  third  party  of  Newco

                                      -23-

<PAGE>

                  Intellectual Property, Elan Intellectual Property or Sheffield
                  Intellectual   Property,  and  provide  such  other  with  any
                  available evidence of such unauthorized activity.

         11.2.2   Elan  shall  have the right to pursue at its own  expense  any
                  enforcement  activities  of the  Elan  Intellectual  Property.
                  Sheffield  shall  have the right to pursue at its own  expense
                  any  enforcement  activities  of  the  Sheffield  Intellectual
                  Property.   Both  Elan  and  Sheffield   agree  to  reasonably
                  co-operate  with each other in any such  action.  Any expenses
                  borne by the  co-operating  party shall be  reimbursed  by the
                  enforcing party. Should either Elan or Sheffield decide not to
                  enforce  the  Elan  Intellectual  Property  or  the  Sheffield
                  Intellectual  Property as the case may be within the  Combined
                  Fields,  Newco  may do so at  its  expense  and  for  its  own
                  benefit, and the parties will reasonably  co-operate with such
                  action.  If an  enforcement  action is  successful,  the Party
                  taking  such  enforcement  action  shall  be  entitled  to any
                  proceeds recovered.

11.3     Infringement of third party patents

         11.3.1   In the event that a claim or  proceeding  is  brought  against
                  Newco by a third party  alleging  that the  manufacture,  use,
                  offer for sale, sale or other activity  relating to any of the
                  Products  constitute an  unauthorized  use of an  intellectual
                  property  right owned by such a third party in the  Territory,
                  Newco shall promptly  advise Elan and Sheffield of such threat
                  or suit.

         11.3.2   Newco  shall  indemnify,  defend  and hold Elan and  Sheffield
                  harmless  against  all  actions,   losses,  claims,   demands,
                  damages, costs and liabilities (including reasonable attorneys
                  fees)  relating  directly or  indirectly to all such claims or
                  proceedings  directed  to  Products;  provided  that  Elan  or
                  Sheffield  shall not  acknowledge to the third party or to any
                  other person the validity of any claims of such a third party,
                  and shall not  compromise  or settle any claim or  proceedings
                  relating  thereto  without the prior written consent of Newco,
                  not to be unreasonably  withheld or delayed. At its option, in
                  the event the claim is directed  primarily to Compounds,  Elan
                  may elect to take over the  conduct of such  proceedings  from
                  Newco,  or in the  event the claim is  directed  primarily  at
                  Sheffield  Devices,  Sheffield  may  elect  to take  over  the
                  conduct of such proceedings from Newco;  provided that Newco's
                  indemnification  obligations  shall  continue;  the  costs  of
                  defending  such  claim  shall be borne by the  Party  assuming
                  control over such proceedings; and Elan or Sheffield shall not
                  compromise or settle any such claim or proceeding  without the
                  prior  written  consent  of  Newco,  not  to  be  unreasonably
                  withheld or delayed.


                                      -24-
<PAGE>

                                    CLAUSE 12

       CROSS-LICENSES/EXPLOITATION OF PRODUCTS OUTSIDE FIELDS A, B AND C

12.1     Solely for the  purpose of and insofar as is  necessary,  in each case,
         for Elan to perform its obligations  under the Elan License  Agreement,
         Newco shall  grant to Elan a  non-exclusive,  worldwide,  royalty-free,
         fully paid-up license for the term of the License Agreements:

         12.1.1   to use the Newco Intellectual Property in the Combined Fields,
                  and

         12.1.2   subject to the terms and  conditions of the Sheffield  License
                  Agreement,  a  sublicense  to use the  Sheffield  Intellectual
                  Property in the Combined Fields.

12.2     Solely for the  purpose of and insofar as is  necessary,  in each case,
         for Sheffield to perform its  obligations  under the Sheffield  License
         Agreement,  Newco shall grant to Sheffield a non-exclusive,  worldwide,
         royalty-free, fully paid-up license for the term of the Licenses:

         12.2.1   to use the Newco Intellectual Property in the Combined Fields,
                  and

         12.2.2   subject  to the  terms  and  conditions  of the  Elan  License
                  Agreement,  a sublicense to use the Elan Intellectual Property
                  in the Combined Fields.

12.3     Elan shall be entitled to exploit  the Newco  Intellectual  Property in
         Field B and/or  Field C  outside  Field B and/or  Field C  respectively
         subject to the Parties  negotiating  a license  agreement in good faith
         (including all material provisions thereof, including as to whether the
         license should be exclusive or non-exclusive),  pursuant to which Newco
         will  grant Elan a license  under the Newco  Intellectual  Property  in
         Field B and/or Field C outside Field B and/or Field C respectively on a
         Product by  Product  basis.  The  financial  terms of the said  license
         agreement shall have regard, inter alia, to:

         12.3.1   the amount of monies expended by Newco in developing the Newco
                  Intellectual Property;

         12.3.2   the materiality of the Newco Intellectual  Property in Field B
                  and/or  Field C by  comparison  to the  further  research  and
                  development work to be conducted, and of the Elan Intellectual
                  Property and the Sheffield Intellectual Property; and

         12.3.3   the  financial  return  likely  to be  earned by Elan from the
                  proposed exploitation outside Field B and/or Field C; and

         12.3.4   the  impact  of  the  proposed   exploitation   of  the  Newco
                  Intellectual  Property in Field B and/or Field C outside Field
                  B and/or Field C respectively on the exploitation of the Newco
                  Intellectual Property in Field B and/or Field C within Field B
                  and/or Field C respectively.

12.4     Sheffield shall be entitled to exploit the Newco Intellectual  Property
         in Field B and/or Field C outside  Field B and/or Field C  respectively
         subject to the Parties  negotiating  a license  agreement in good faith
         (including all material provisions thereof, including as to whether the
         license should be exclusive or non-exclusive),  pursuant to which Newco
         will grant  Sheffield a license under the Newco  Intellectual  Property
                                      -25-

<PAGE>

         outside  Field B and/or  Field C  respectively  on a Product by Product
         basis.  The financial  terms of the said license  agreement  shall have
         regard, inter alia, to:

         12.4.1   the amount of monies expended by Newco in developing the Newco
                  Intellectual Property;

         12.4.2   the materiality of the Newco Intellectual  Property in Field B
                  and/or  Field C by  comparison  to the  further  research  and
                  development work to be conducted, and of the Elan Intellectual
                  Property and the Sheffield Intellectual Property; and

         12.4.3   the financial return likely to be earned by Sheffield from the
                  proposed exploitation of outside Field B and/or Field C; and

         12.4.4   the  impact  of  the  proposed   exploitation   of  the  Newco
                  Intellectual  Property in Field B and/or Field C outside Field
                  B and/or Field C respectively on the exploitation of the Newco
                  Intellectual Property in Field B and/or Field C within Field B
                  and/or Field C respectively.

12.5     Newco hereby  grants to Elan a  worldwide,  perpetual,  fully-paid  and
         royalty-free license, with the right to grant sublicenses, to the Newco
         Intellectual Property in Field A for use outside Field A.

                                    CLAUSE 13

                                   REGULATORY

13.1     Newco  shall  keep the other  Parties  promptly  and fully  advised  of
         Newco's  regulatory  activities,  progress and procedures.  Newco shall
         inform the other Parties of any dealings it shall have with an RHA, and
         shall  furnish  the other  Parties  with  copies of all  correspondence
         relating to the Products.  The Parties shall collaborate with a view to
         obtaining  any  required  regulatory  approval of the RHA to market the
         Products.

13.2     Newco shall, at its own cost, file,  prosecute and maintain any and all
         Regulatory Applications for the Products in the Territory in accordance
         with the Business Plan,  except where such  obligations are by contract
         undertaken by a third party.

13.3     Subject to Clause 13.5,  and subject to a  determination  by Newco that
         one or more regulatory  approvals should be held in the name of Newco's
         commercial  partner  such as a  sub-licensee,  any  and all  Regulatory
         Approvals  obtained  hereunder for any Product shall be prosecuted  and
         owned by Newco,  provided  that Newco  shall  allow Elan and  Sheffield
         access thereto to enable Elan and Sheffield to fulfill their respective
         obligations and exercise their respective  rights under this Agreement.
         Newco shall maintain such Regulatory Approvals at its own cost.

                                      -26-

<PAGE>

13.4     It  is  hereby  acknowledged  that  there  are  inherent  uncertainties
         involved in the registration of pharmaceutical  products with the RHA's
         insofar as obtaining  approval is concerned and such uncertainties form
         part  of  the  business  risk  involved  in  undertaking  the  form  of
         commercial collaboration as set forth in this Agreement.

13.5     The DMF (Drug Master File) relating to Formulations  shall be processed
         by and be the  property  of Elan and at all times  held in Elan's  sole
         name.  Elan  grants  Newco for Field A, Field B and Field C, a right to
         reference Elan's DMF, as described  herein,  with the FDA to the extent
         necessary for Newco's  regulatory  purposes.  Elan grants Sheffield for
         Field B and  Field C a right to  reference  Elan's  DMF,  as  described
         herein, with the FDA to the extent necessary for Sheffield's regulatory
         purposes.

                                    CLAUSE 14

                                  MANUFACTURING

Elan will supply  Nanocrystal  Compounds to Newco at Elan's fully  burdened cost
plus [REDACTED] of such cost; provided,  however, that Elan shall have the right
to subcontract the manufacture  and supply of the  Nanocrystal  Compounds.  Elan
shall have the first right to manufacture  and supply,  and/or  subcontract  the
manufacture and supply of Formulations, subject to the Zambon Agreement.

Any such  supply  agreement  shall be  negotiated  and agreed by the Parties not
later than the date of  completion of Phase II (as such term is commonly used in
connection  with FDA  applications)  of the R&D  Program.  The terms of the said
supply  agreements  shall be on Elan's  normal  commercial  terms,  and shall be
negotiated in good faith by the Parties  thereto  provided that Elan agrees that
the  cost  which  would to be  invoiced  by Elan to  Newco  in  respect  of such
manufacture would be Elan's  fully-burdened actual costs plus [REDACTED] of such
costs.

If Elan does not exercise its first right  hereunder to manufacture  and supply,
and/or subcontract the manufacture and supply of Formulations,  then Newco shall
be  free  to  enter  into   negotiations  with  a  third  party  (other  than  a
Technological  Competitor  of Elan) to agree to terms upon which the third party
would be licensed by Elan (on licensing terms satisfactory to Elan) and by Newco
to  the  extent  necessary  (on  licensing  terms   satisfactory  to  Newco)  to
manufacture the relevant Formulation(s) in the Territory, which terms when taken
as a whole,  are not more favourable to the third party than the principal terms
of the last written  proposal  offered by Newco to Elan or by Elan to Newco,  as
the case may be.


                                      -27-
<PAGE>

                                    CLAUSE 15

                        TECHNICAL SERVICES AND ASSISTANCE

15.1     Whenever  commercially and technically  feasible,  Newco shall contract
         with  Sheffield  or Elan,  as the case may be, to  perform  such  other
         services as Newco may require, other than those specifically dealt with
         hereunder  or in the License  Agreements.  In  determining  which Party
         should provide such services,  the Management Committee shall take into
         account the respective  infrastructure,  capabilities and experience of
         Elan  and  Sheffield.  There  shall be no  obligation  upon  either  of
         Sheffield or Elan to perform such services.

15.2     Newco shall, if the Participants so agree,  conclude an  administrative
         support  agreement  with Elan  and/or  Sheffield  on such  terms as the
         Parties  thereto  shall in good  faith  negotiate.  The  administrative
         services  shall  include  one or more of the  following  administrative
         services as requested by Newco:

         15.2.1   accounting, financial and other services;

         15.2.2   tax services;

         15.2.3   insurance services;

         15.2.4   human resources services;

         15.2.5   legal and company secretarial services;

         15.2.6   patent and related intellectual property services; and

         15.2.7   all such other services  consistent  with and of the same type
                  as those services to be provided  pursuant to this  Agreement,
                  as may be required.

         The foregoing list of services  shall not be deemed  exhaustive and may
         be changed from time to time upon written request by Newco.

15.3.    The  Parties   agree  that  each  Party  shall   effect  and   maintain
         comprehensive  general  liability  insurance in respect of all clinical
         trials and other  activities  performed by them on behalf of Newco. The
         Stockholders  and  Newco  shall  ensure  that  the  industry   standard
         insurance  policies  shall be in place for all activities to be carried
         out by Newco.

15.4     If Elan or Sheffield so  requires,  Sheffield or Elan,  as the case may
         be, shall receive,  at times and for periods mutually acceptable to the
         Parties,  employees of the other Party (such employees to be acceptable
         to the receiving Party in the matter of  qualification  and competence)
         for  instruction  in respect of the Elan  Intellectual  Property or the
         Sheffield  Intellectual  Property,  as the case may be, as necessary to
         further the Project.

15.5     The employees received by Elan or Sheffield,  as the case may be, shall
         be subject to  obligations  of  confidentiality  no less stringent than
         those set out in Clause 22 and such employees  shall observe the rules,
         regulations  and  systems  adopted  by the  Party  receiving  the  said
         employees for its own employees or visitors.

                                      -28-

<PAGE>
                                    CLAUSE 16

                      AUDITORS, BANKERS, REGISTERED OFFICE,
                      ACCOUNTING REFERENCE DATE; SECRETARY

Unless  otherwise  agreed by the Stockholders and save as may be provided to the
contrary herein:

16.1     the  auditors of Newco shall be Ernst & Young or as  designated  by the
         Directors;

16.2     the bankers of Newco shall be as  designated  by the  Directors;  there
         shall be established at a U.S. bank mutually agreed to by the parties a
         bank account managed by Sheffield for the benefit of Newco;

16.3     the  accounting  reference  date of Newco  shall be December 31 in each
         Financial Year; and

16.4     the secretary of Newco shall be I.S.  Outerbridge  or such other Person
         as may be appointed by the Directors from time to time.


                                    CLAUSE 17

                              TRANSFERS OF SHARES;
                     RIGHT OF FIRST OFFER; TAG ALONG RIGHTS

General:

17.1.    No  Stockholder  shall,  directly  or  indirectly,  sell  or  otherwise
         transfer  (each,  a  "Transfer")  any  Shares  held by it  except in as
         expressly permitted by and accordance with the terms of this Agreement.
         Newco shall not, and shall not permit any  transfer  agent or registrar
         for any Shares to, transfer upon the books of Newco any Shares from any
         Stockholder to any transferee, in any manner, except in accordance with
         this Agreement,  and any purported transfer not in compliance with this
         Agreement shall be void.

         During  the  Research  and  Development  Term,  no  Stockholder  shall,
         directly or  indirectly,  sell or  otherwise  Transfer any of its legal
         and/or  beneficial  interest  in the  Shares  held  by it to any  other
         Person.  After  completion  of the  Research  and  Development  Term, a
         Stockholder may Transfer Shares provided such Stockholder complies with
         the provisions of Clauses 17.2 and 17.3.

         Notwithstanding  anything  contained  herein to the contrary (i) at all
         times, EIS and/or Sheffield shall have the right to Transfer any Shares

                                      -29-

<PAGE>

         to their Affiliates  provided,  however,  that such assignment does not
         result in  adverse  tax  consequences  for any other  Parties  and (ii)
         Sheffield  may not  Transfer  or allow any  Encumbrance  in, or to, any
         Shares that are subject to the Exchange Right, other than to EIS or its
         Affiliates.  EIS shall  have the  right to  Transfer  any  Shares to an
         affiliate;  provided,  that such Affiliates shall agree to be expressly
         subject to and bound by all the  limitations  and provisions  which are
         embodied in this Agreement.

17.2     No  Stockholder  shall,  except with the prior  written  consent of the
         other  Stockholder,  create or permit to subsist  any  pledge,  lien or
         charge over, or grant any option or other rights or Encumbrance  in, or
         to, all or any of the Shares  held by it (other  than by a Transfer  of
         such Shares in accordance  with the provisions of this  Agreement) made
         by it to Newco unless any Person in whose favour any such pledge, lien,
         or charge is created or  permitted  to subsist or such option or rights
         are granted or such interest is disposed of shall be expressly  subject
         to and bound by all the limitations  and provisions  which are embodied
         in this Agreement.

17.3     Rights of First Offer:

         If, at any time after the end of the Research and  Development  Term, a
         Stockholder shall desire to Transfer any Shares owned by it (a "Selling
         Stockholder"),  in any  transaction  or series of related  transactions
         other than a Transfer to an Affiliate or  subsidiary  or in the case of
         EIS  permitted  by the  Agreement  to a special  purpose  financing  or
         similar entity established by EIS, then such Selling  Stockholder shall
         deliver  prior  written  notice of its desire to Transfer (a "Notice of
         Intention") (i) to Newco and (ii) to the  Stockholders  who are not the
         Selling Stockholder (and any transferee thereof permitted hereunder, if
         any), as applicable, setting forth such Selling Stockholder's desire to
         make such  Transfer,  the number of Shares  proposed to be  transferred
         (the  "Offered  Shares")  and the  proposed  form of  transaction  (the
         "Transaction  Proposal"),  together  with any  available  documentation
         relating  thereto,  if any,  and the  consideration  to be paid and the
         terms and  conditions,  at which such Selling  Stockholder  proposes to
         Transfer the Offered  Shares (the "Offer  Price").  The "Right of First
         Offer"  provided  for in this  Clause 17 shall be  subject  to any "Tag
         Along  Right"  benefiting  a  Stockholder  which may be provided for by
         Clause 17, subject to the exceptions set forth therein.

         Upon receipt of the Notice of Intention,  the  Stockholders who are not
         the Selling  Stockholder  shall have the right to purchase at the Offer
         Price the Offered Shares,  exercisable by the delivery of notice to the
         Selling  Stockholder (the "Notice of Exercise"),  with a copy to Newco,
         within 10  business  days  from the date of  receipt  of the  Notice of
         Intention.  If no such Notice of  Exercise  has been  delivered  by the
         Stockholders   who  are  not  the  Selling   Stockholder   within  such
         10-business  day period,  or such Notice of Exercise does not relate to
         all of the Offered Shares covered by the Notice of Intention,  then the
         Selling  Stockholder  shall be entitled to Transfer  all of the Offered
         Shares to the intended transferee. In the event that all of the Offered
         Shares are not purchased by the non-selling  Stockholders,  the Selling
         Stockholder  shall sell the  available  Offered  Shares  within 30 days
         after  the  delivery  of such  Notice  of  Intention  on  terms no more
         favorable  to a third  party than those  presented  to the  non-selling

                                      -30-

<PAGE>

         Stockholders.  If such sale does not occur,  the Offered  Shares  shall
         again be  subject  to the  Right of First  Refusal  set forth in Clause
         17.3.

         In the  event  that  any of the  Stockholders  who are not the  Selling
         Stockholder  exercise their right to purchase all of the Offered Shares
         (in accordance with this Clause 17), then the Selling Stockholder shall
         sell all of the Offered Shares to such  Stockholder(s),  in the amounts
         set forth in the Notice of  Intention,  after not less than 20 business
         days and not more than 30 business  days from the date of the  delivery
         of the  Notice  of  Exercise.  In the  event  that more than one of the
         Stockholders who are not the Selling  Stockholders wish to purchase the
         Offered  Shares,   the  Offered  Shares  shall  be  allocated  to  such
         Stockholders on the basis of their pro rata equity  interests in Newco,
         taken as a whole.

         The rights and obligations of each of the Stockholders  pursuant to the
         Right of First Offer provided herein shall terminate upon the date that
         the Common  Stock is  registered  under  Section  12(b) or 12(g) of the
         Exchange Act.

         At the  closing of the  purchase  of all of the  Offered  Shares by the
         Stockholders  who  are  not  the  Selling  Stockholder   (scheduled  in
         accordance  with Clause  17),  the Selling  Stockholder  shall  deliver
         certificates  evidencing the Offered Shares being sold,  duly endorsed,
         or  accompanied by written  instruments of transfer in form  reasonably
         satisfactory to the Stockholders  who are not the Selling  Stockholder,
         duly executed by the Selling Stockholder, free and clear of any adverse
         claims,  against  payment of the purchase  price  therefor in cash, and
         such other  customary  documents as shall be  necessary  in  connection
         therewith.

17.4     Tag Along Rights:

         Subject to Clause 17.3, a Stockholder (the "Transferring  Stockholder")
         shall  not  Transfer  (either  directly  or  indirectly),  in  any  one
         transaction or series of related  transactions,  to any Person or group
         of  Persons,  any  Shares,  unless  the  terms and  conditions  of such
         Transfer  shall  include  an  offer  to  the  other  Stockholders  (the
         "Remaining Stockholders"),  to sell Shares at the same price and on the
         same terms and conditions as the Transferring Stockholder has agreed to
         sell its Shares (the "Tag Along Right").

         In the event a Transferring Stockholder proposes to Transfer any Shares
         in a transaction subject to this Clause 17.4, it shall notify, or cause
         to be  notified,  the  Remaining  Stockholders  in writing of each such
         proposed  Transfer.  Such notice  shall set forth:  (i) the name of the
         transferee and the amount of Shares  proposed to be  transferred,  (ii)
         the proposed amount and form of consideration  and terms and conditions
         of payment offered by the transferee (the "Transferee Terms") and (iii)
         that the  transferee  has been informed of the Tag Along Right provided
         for in this  Clause  17,  if such  right is  applicable,  and the total
         number  of Shares  the  transferee  has  agreed  to  purchase  from the
         Stockholders in accordance with the terms hereof.

         The  Tag  Along  Right  may be  exercised  by  each  of  the  Remaining
         Stockholders  by  delivery  of a  written  notice  to the  Transferring
         Stockholder  (the "Co-sale  Notice")  within 20 business days following

                                      -31-

<PAGE>

         receipt  of the  notice  specified  in the  preceding  subsection.  The
         Co-sale Notice shall state the number of Shares owned by such Remaining
         Stockholder which the Remaining  Stockholder  wishes to include in such
         Transfer;  provided,  however,  that without the written consent of the
         Transferring  Stockholder,  the amount of such securities  belonging to
         the Remaining  Stockholder included in such Transfer may not be greater
         than such Remaining  Stockholder's  percentage  beneficial ownership of
         Fully Diluted Common Stock  multiplied by the total number of shares of
         Fully  Diluted  Common  Stock  to be  sold  by  both  the  Transferring
         Stockholder and all Remaining  Stockholders.  Upon receipt of a Co-sale
         Notice, the Transferring  Stockholder shall be obligated to transfer at
         least the entire  number of Shares set forth in the  Co-sale  Notice to
         the transferee on the Transferee  Terms;  provided,  however,  that the
         Transferring  Stockholder shall not consummate the purchase and sale of
         any Shares  hereunder  if the  transferee  does not  purchase  all such
         Shares specified in all Co-sale Notices.  If no Co-sale Notice has been
         delivered to the  Transferring  Stockholder  prior to the expiration of
         the 20 business day period  referred to above and if the  provisions of
         this Section have been complied with in all respects,  the Transferring
         Stockholder shall have the right for a 45-day period to Transfer Shares
         to the transferee on the Transferee Terms without further notice to any
         other party, but after such 45-day period, no such Transfer may be made
         without  again  giving  notice  to the  Remaining  Stockholders  of the
         proposed  Transfer and complying with the  requirements  of this Clause
         17. At the closing of any Transfer of Shares subject to this Clause 17,
         the Transferring  Stockholder,  and the Remaining  Stockholder,  in the
         event such Tag Along Right is  exercised,  shall  deliver  certificates
         evidencing  such  securities  as have been  Transferred  by each,  duly
         endorsed,  or  accompanied  by written  instruments of transfer in form
         reasonably  satisfactory  to the  transferee,  free  and  clear  of any
         adverse claim, against payment of the purchase price therefor.

         Notwithstanding  the  foregoing,  this Clause 17 shall not apply to any
         sale of Common Stock  pursuant to an effective  registration  statement
         under the Securities Act in a bona fide public offering.


                                    CLAUSE 18

                    MATTERS REQUIRING PARTICIPANTS' APPROVAL

18.1     Subject to the provisions of Clause 18.2, in consideration of Sheffield
         and Elan  agreeing  to enter into the License  Agreements,  the Parties
         hereby agree that Newco shall not without the prior approval of the EIS
         Director and the Sheffield Directors:

         18.1.1.  make a  material  Newco  determination  outside  the  ordinary
                  course   of   business,   including,   among   other   things,
                  acquisitions  or  dispositions  of  intellectual  property and
                  licenses or sublicenses,  changes in the Business or the Newco
                  budget;  entry into joint ventures and similar arrangements as
                  they relate to the  Licensed  Technologies  and changes to the
                  Business Plan as they relate to the Licensed Technologies;

                                      -32-

<PAGE>

         18.1.2.  issue  any   unissued   Shares  or   unissued   Common   Stock
                  Equivalents,  or  create,  authorize  or issue any new  shares
                  (including a split of the Shares) or Common Stock Equivalents,
                  except as expressly  permitted by the Newco By-Laws in effect
                  as of the date hereof;

         18.1.3.  alter  any  rights  attaching  to any  class  of  share in the
                  capital of Newco or alter the Newco By-Laws;

         18.1.4.  consolidate,  sub-divide  or  convert  any  of  Newco's  share
                  capital or in any way alter the rights attaching thereto;

         18.1.5.  dispose of all or substantially all of the assets of Newco;

         18.1.6.  do or permit  or  suffer  to be done any act or thing  whereby
                  Newco may be wound up (whether  voluntarily or  compulsorily),
                  save as otherwise expressly provided for in this Agreement;

         18.1.7.  enter into any contract or transaction  except in the ordinary
                  and proper course of the Business on arm's length terms;

         18.1.8.  license or sub-license any of the Elan Intellectual  Property,
                  Sheffield Intellectual Property, Newco Intellectual Property;

         18.1.9.  amend or vary the terms of the Sheffield  License Agreement or
                  the Elan License Agreement;

         18.1.10. permit a person other than Newco to own a regulatory  approval
                  relating to the Product(s);

         18.1.11. approve,  amend or vary the Business Plan or the Newco budget;
                  and

         18.1.12. alter the number of Directors.

                                    CLAUSE 19

                                    DISPUTES

19.1     Should any dispute or difference  arise between Elan and Sheffield,  or
         between  Elan or  Sheffield  and Newco,  during  the  period  that this
         Agreement is in force,  other than a dispute or difference  relating to
         (i) the  interpretation  of any provision of this  Agreement,  (ii) the
         interpretation  or  application  of law, or (iii) the  ownership of any
         intellectual property,  then any Party may forthwith give notice to the

                                      -33-

<PAGE>

         other  Parties that it wishes such dispute or difference to be referred
         to the Chief  Executive  Officer of Sheffield and the President of Elan
         Pharmaceutical Technology, a division of Elan Corporation, Plc ("EPT").

19.2     In any event of a notice being served in  accordance  with Clause 19.1,
         each of the  Participants  shall  within 14 days of the service of such
         notice  prepare and  circulate to the chief  executive  officer of each
         Participant  a memorandum  or other form of  statement  setting out its
         position on the matter in dispute and its  reasons  for  adopting  that
         position. Each memorandum or statement shall be considered by the chief
         executive  officers of the  Participants  who shall endeavor to resolve
         the dispute.  If the chief executive officers of the Participants agree
         upon a resolution or disposition of the matter,  they shall each sign a
         statement which sets out the terms of their agreement. The Participants
         agree  that they shall  exercise  the  voting  rights and other  powers
         available to them in relation to Newco to procure that the agreed terms
         are fully and promptly carried into effect.

19.3     In the event the  chief  executive  officers  of the  Participants  are
         unable to resolve a dispute or  difference  when it is referred to them
         under Clause 19.1 which relates to the interpretation of this Agreement
         or any other Transaction Document or the compliance of the Parties with
         their legal obligations thereunder, such dispute or difference shall be
         referred to arbitration in accordance with Clause 24.8.3 hereof. If the
         dispute or  difference  does not relate to the  interpretation  of this
         Agreement or any other  Transaction  Document or the  compliance of the
         Parties with their legal  obligations  thereunder,  the  provisions  of
         Clause 24.8.2 shall govern.


                                    CLAUSE 20

                                   TERMINATION

20.1     This Agreement shall govern the operation and existence of Newco until

         20.1.1   terminated by written agreement of all Parties hereto or

         20.1.2   otherwise terminated in accordance with this Clause 20.

20.2     For the purpose of this Clause 20, a "Relevant  Event" is  committed or
         suffered by a Participant if:

         20.2.1   [REDACTED]

                                      -34-

<PAGE>
         20.2.2   [REDACTED]

         20.2.3   [REDACTED]

         20.2.4   [REDACTED]

         20.2.5   [REDACTED]

         20.2.6   [REDACTED]

20.4     If either  Participant  commits or suffers a Relevant Event,  the other
         Participant shall be entitled, within three months of the occurrence of
         the  Relevant  Event,  to  require  the  defaulting   Participant  (the
         "Recipient  Participant") to sell on reasonable terms of payment to the
         non-defaulting  Participant (the "Proposing  Participant") all (but not
         some only) of the Shares,  held or beneficially  owned by the Recipient
         Participant  for an amount equal to [REDACTED] of the fair market value
         of the Shares of the Recipient Participant (the "Buyout Option").

20.5     The Proposing Participant shall notify the Recipient Participant of the
         exercise of the Buyout Option,  no later than 30 business days prior to
         the proposed  exercise  thereof,  by delivering  written  notice to the
         Recipient  Participant  stating that the Buyout Option is exercised and
         the price at which the Proposing Participant is willing to purchase the
         Shares of the Recipient Participant.

20.6     In the event that the  Participants  do not agree upon a purchase price
         for the Shares within five  Business Days  following the receipt by the
         Recipient  Participant of written notice from the Proposing Participant
         pursuant to Clause 20.5 above,  the Proposing  Participant  may contact
         the American Arbitration Association ("AAA"),  sitting in New York City
         and request that an  independent  US-based  arbitrator who is expert in
         the  pharmaceutical/biotechnology   industry  be  appointed  within  10
         Business  Days.  The AAA shall  endeavor to select an arbitrator who is
         technically knowledgeable in the pharmaceutical/biotechnology  industry

                                      -35-

<PAGE>

         (and  who  directly  and  through  his  affiliates,   has  no  business
         relationship with, or shareholding in, either the Proposing Participant
         or the  Recipient  Participant).  Promptly  upon being  notified of the
         arbitrator's  appointment,  the Proposing Participant and the Recipient
         Participant shall submit to the arbitrator  details of their assessment
         of the fair market  value for the Shares of the  Recipient  Participant
         together  with such  information  as they think  necessary  to validate
         their assessment. The arbitrator shall notify the Recipient Participant
         of  [REDACTED]  of the fair  market  value  assessed  by the  Proposing
         Participant  (the "Proposing  Participant  Price") and shall notify the
         Proposing  Participant  of [REDACTED] of the fair market value assessed
         by the Recipient  Participant (the "Recipient  Participant Price"). The
         Proposing  Participant  and the  Recipient  Participant  shall  then be
         entitled to make  further  submissions  to the  arbitrator  within five
         Business Days  explaining  why the Recipient  Participant  Price or the
         Proposing  Participant  Price, as the case may be, is unjustified.  The
         arbitrator shall thereafter meet with the Proposing Participant and the
         Recipient  Participant and shall thereafter choose either the Recipient
         Participant Price or the Proposing Participant Price (but not any other
         price) as the purchase price for the Shares (the  "Purchase  Price") on
         the  basis of  which  price  the  Expert  determines  to be  closer  to
         [REDACTED]  of the fair  market  value for the Shares of the  Recipient
         Participant. The arbitrator shall use his best efforts to determine the
         Purchase  Price  within  30  Business  Days  of  his  appointment.  The
         Proposing  Participant  and the  Recipient  Participant  shall bear the
         costs of the arbitrator  equally  provided that the arbitrator  may, in
         his  discretion,  allocate all or a portion of such costs to one Party.
         Any decision of the arbitrator shall be final and binding.

20.7     The Proposing  Participant  shall  purchase the Shares of the Recipient
         Participant by delivery of the Purchase Price in cash no later than the
         15th Business Day following  determination of the Purchase Price by the
         Expert.

20.8     The Shares of the Recipient Participant so transferred shall be sold by
         the  transferor as  beneficial  owner with effect from the date of such
         transfer free from any lien,  charge or encumbrance with all rights and
         restrictions  attaching thereto. If the Proposing Participant elects to
         purchase  the Shares of the  Recipient  Participant,  the Shares of the
         Recipient  Participant  shall be sold by the Recipient  Participant  as
         beneficial  owner for a price equal to [REDACTED] of the Purchase Price
         with effect from the date specified by the Proposing Participant in its
         notice of election free from any lien,  charge or encumbrance  together
         with all rights attaching thereto.

20.9     If the Proposing  Participant exercises the Buyout Option, both parties
         will  negotiate  in  good  faith  to  agree  to  additional  reasonable
         provisions and/or  amendments to the License  Agreements to protect the
         intellectual property rights of the Recipient Party.

20.10    If either  Participant  commits a Relevant Event, the other Stockholder
         shall have in  addition  to all other  legal and  equitable  rights and
         remedies hereunder, the right to terminate this Agreement upon 30 days'
         written notice.

                                      -36-

<PAGE>

20.11    In the event of a termination of the Elan License  Agreement and/or the
         Sheffield License Agreement,  both parties will negotiate in good faith
         to determine  whether this  Agreement  should be terminated  and if so,
         which provisions should survive termination.

20.12    The  provisions  of Clauses  1.1,  18, 19, 20 and 22 shall  survive the
         termination  of this  Agreement  under this  Clause  20.10 or by mutual
         consent  pursuant to Clause 20.1 in  accordance  with their terms;  all
         other terms and provisions of this Agreement shall cease to have effect
         and be null and void upon the  termination of this Agreement under this
         Clause 20.10 or by mutual consent pursuant to Clause 20.1.


                                    CLAUSE 21

                                  SHARE RIGHTS

         The  following is a summary of the terms of the capital stock of Newco.
This summary does not purport to be complete and is qualified in all respects by
reference to the Newco By-laws, which are hereby incorporated by reference.

         Each share of Common  Stock is  entitled  to one vote on all matters on
which the  stockholders  of Newco are  entitled to vote.  Subject to the Bermuda
Companies Act of 1981 (or any successor legislation),  shares of Preferred Stock
shall not be entitled to vote on any matters brought before the  shareholders of
Newco. At any time after to the second anniversary of the date hereof each share
of Preferred Stock may be converted into shares of Common Stock at a one-for-one
ratio,  subject to  adjustment  for stock  splits,  stock  dividends and similar
events. The Preferred Stock and the Common Stock rank pari passu with respect to
the payment of  dividends,  which shall be paid to the holders  thereof on a pro
rata basis. Upon any liquidation, dissolution or winding up of Newco or the sale
of  substantially  all of the  assets of Newco,  or the merger of Newco with and
into another  Person,  the Preferred  Stock shall rank prior to the Common Stock
and the holders of  Preferred  Stock shall be entitled to be paid,  prior to any
distribution  to any  holders  of Common  Stock,  an  amount  in cash  equal the
aggregate  purchase  price paid by the  Stockholders  for the  Preferred  Stock,
pursuant to Clause 4.41 hereof.


                                    CLAUSE 22

                                 CONFIDENTIALITY

22.1     The  Parties  and/or  Newco  acknowledge  and  agree  that  it  may  be
         necessary,  from time to time,  to disclose to each other  confidential
         and/or   proprietary   information,   including   without   limitation,
         inventions,  works  of  authorship,   trade  secrets,   specifications,
         designs, data, know-how and other information, relating to the Combined
         Fields,   the  Products,   present  or  future   products,   the  Newco
         Intellectual  Property, the Elan Intellectual Property or the Sheffield
         Intellectual Property, as the case may be, methods, compounds, research



                                      -37-

<PAGE>

         projects,  work  in  process,  services,  sales  suppliers,  customers,
         employees  and/or  business of the disclosing  Party,  whether in oral,
         written,   graphic  or  electronic  form  (collectively   "Confidential
         Information").

22.2     Any Confidential Information revealed by a Party to another Party shall
         be maintained as confidential  and shall be used by the receiving Party
         exclusively for the purposes of fulfilling the receiving Party's rights
         and  obligations  under  this  Agreement,  and  for no  other  purpose.
         Confidential Information shall not include:

         22.2.1   information that is generally available to the public;

         22.2.2   information that is made public by the disclosing Party;

         22.2.3   information that is  independently  developed by the receiving
                  Party, as evidenced by such Party's records,  without the aid,
                  application  or  use of the  disclosing  Party's  Confidential
                  Information;

         22.2.4   information that is published or otherwise becomes part of the
                  public domain without any  disclosure by the receiving  Party,
                  or on the part of the receiving Party's  directors,  officers,
                  agents, representatives or employees;

         22.2.5   information that becomes available to the receiving Party on a
                  non-confidential basis, whether directly or indirectly, from a
                  source other than the disclosing  Party,  which source did not
                  acquire this information on a confidential basis; or

         22.2.6   information  which the receiving Party is required to disclose
                  pursuant to:

                  (i)      a valid order of a court or other  governmental  body
                           or any political  subdivision thereof or as otherwise
                           required by law, rule or regulation; or

                  (ii)     other requirement of law;

provided,  however,  that if the  receiving  Party becomes  legally  required to
disclose  any  Confidential  Information,  the  receiving  Party  shall give the
disclosing  Party prompt  notice of such fact so that the  disclosing  Party may
obtain a protective order or confidential  treatment or other appropriate remedy
concerning any such disclosure.  The receiving Party shall fully co-operate with
the disclosing Party in connection with the disclosing Party's efforts to obtain
any such order or other remedy. If any such order or other remedy does not fully
preclude disclosure,  the receiving Party shall make such disclosure only to the
extent that such disclosure is legally required; or

         22.2.7   information  which  was  already  in  the  possession  of  the
                  receiving Party at the time of receiving such information,  as
                  evidenced by its records,  provided such  information  was not
                  previously provided to the receiving party from a source which
                  was under an obligation to keep such information confidential;
                  or

         22.2.8   information  that is the  subject of a written  permission  to
                  disclose, without restriction or limitation, by the disclosing
                  Party.

                                      -38-

<PAGE>

22.3     Each Party agrees to disclose Confidential Information of another Party
         only to those employees, representatives and agents requiring knowledge
         thereof  in  connection  with  their  duties  directly  related  to the
         fulfilling of the Party's obligations under this Agreement,  so long as
         such  persons  are  under  an  obligation  of  confidentiality  no less
         stringent than as set forth herein. Each Party further agrees to inform
         all  such  employees,  representatives  and  agents  of the  terms  and
         provisions of this  Agreement and their duties  hereunder and to obtain
         their  consent   hereto  as  a  condition  of  receiving   Confidential
         Information.  Each Party  agrees  that it will  exercise  a  reasonable
         degree  of  care  and  protection  to  preserve  the   proprietary  and
         confidential  nature of the  Confidential  Information  disclosed  by a
         Party.  Each Party agrees that it will,  upon request of another Party,
         return all documents  and any copies  thereof  containing  Confidential
         Information  belonging to or disclosed by such other Party.  Each Party
         shall  promptly   notify  the  other  Parties  upon  discovery  of  any
         unauthorized  use or  disclosure  of the  other  Parties'  Confidential
         Information.

22.4     Notwithstanding the above, each Party may use or disclose  Confidential
         Information  disclosed to it by another Party to the extent such use or
         disclosure  is  reasonably  necessary in filing or  prosecuting  patent
         applications,  prosecuting  or  defending  litigation,  complying  with
         patent  applications,  prosecuting or defending  litigation,  complying
         with  applicable  governmental   regulations  or  otherwise  submitting
         information  to  tax  or  other  governmental  authorities,  conducting
         clinical  trials,  or granting a  permitted  sub-license  or  otherwise
         exercising its rights hereunder;  provided, that if a Party is required
         to  make  any  such  disclosure  of  the  other  Party's   Confidential
         Information,  other than pursuant to a confidentiality  agreement, such
         Party  shall  inform  the  third  party  recipient  of  the  terms  and
         provisions  of this  Agreement  and their  duties  hereunder  and shall
         obtain their commitment to abide by the  confidentiality  provisions of
         this Clause 22 as a condition of releasing to the third party recipient
         the Confidential Information.

22.5     Any breach of this Clause 22 by any employee,  representative  or agent
         of a Party is considered a breach by the Party itself.

22.6     The  provisions  relating  to  confidentiality  in this Clause 22 shall
         remain  in  effect  during  the Term and for a  period  of seven  years
         following the termination of this Agreement.

22.7     The Parties agree that the  obligations of this Clause 22 are necessary
         and reasonable in order to protect the Parties' respective  businesses,
         and  each  Party  expressly  agrees  that  monetary  damages  would  be
         inadequate  to  compensate a Party for any breach by the other Party of
         its covenants and agreements set forth herein. Accordingly, the Parties
         agree and acknowledge  that any such violation or threatened  violation
         will cause  irreparable  injury to a Party and that, in addition to any
         other remedies that may be available, in law or in equity or otherwise,
         any Party  shall be entitled to obtain  injunctive  relief  against the
         threatened   breach  of  the   provisions  of  this  Clause  22,  or  a
         continuation   of  any  such  breach  by  the  other  Party,   specific
         performance and other equitable  relief to redress such breach together
         with its damages and  reasonable  counsel  fees and expenses to enforce
         its rights  hereunder,  without  the  necessity  of  proving  actual or
         express damages.

                                      -39-

<PAGE>
                                    CLAUSE 23

                                      COSTS

22.1     Each  Stockholder  shall bear its own legal and other costs incurred in
         relation to preparing and concluding this Agreement and the Transaction
         Documents.

22.2     All other  costs,  legal  fees,  registration  fees and other  expenses
         relating to the transactions  contemplated hereby,  including the costs
         and expenses incurred in relation to the incorporation of Newco,  shall
         be borne by Newco.


                                    CLAUSE 24

                                     GENERAL

24.1     Good Faith:

         Each of the Parties hereto  undertakes with the others to do all things
         reasonably  within its power that are  necessary  or  desirable to give
         effect to the spirit and intent of this Agreement.

24.2     Further Assurance:

         At the request of any of the Parties,  the other Party or Parties shall
         (and shall use reasonable  efforts to procure that any other  necessary
         parties shall) execute and perform all such documents,  acts and things
         as may  reasonably  be  required  subsequent  to the  signing  of  this
         Agreement for assuring to or vesting in the  requesting  Party the full
         benefit of the terms hereof.

24.3     No Representation:

         Each of the Parties  hereto hereby  acknowledges  that in entering into
         this  Agreement  it has not relied on any  representation  or  warranty
         except as expressly  set forth  herein or in any  document  referred to
         herein.

24.4     Force Majeure:

         Neither  Party to this  Agreement  shall  be  liable  for  delay in the
         performance of any of its obligations hereunder if such delay is caused
         by or results  from causes  beyond its  reasonable  control,  including
         without limitation,  acts of God, fires,  strikes, acts of war (whether
         war be  declared  or  not),  insurrections,  riots,  civil  commotions,
         strikes,  lockouts or other labor  disturbances  or intervention of any
         relevant government  authority,  but any such delay or failure shall be
         remedied by such Party as soon as practicable.

                                      -40-

<PAGE>

24.5     Relationship of the Parties:

         Nothing  contained in this  Agreement is intended or is to be construed
         to  constitute  Elan/EIS and  Sheffield as partners,  or Elan/EIS as an
         employee or agent of Sheffield, or Sheffield as an employee or agent of
         Elan/EIS.

         No Party hereto shall have any express or implied right or authority to
         assume or create any obligations on behalf of or in the name of another
         Party  or  to  bind  another  Party  to  any  contract,   agreement  or
         undertaking with any third Party.

24.6     Counterparts:

         This Agreement may be executed in any number of  counterparts,  each of
         which when so  executed  shall be deemed to be an  original  and all of
         which when taken together shall constitute this Agreement.

24.7     Notices:

         Any notice to be given under this Agreement shall be sent in writing by
         registered  or recorded  delivery post or reputable  overnight  courier
         such as Federal Express or telecopied to:

         Elan/EIS at:

         Lincoln House, Lincoln Place, Dublin 2, Ireland
         Attention:        Vice President & General Counsel
         Elan Pharmaceutical Technologies,
         a division of Elan Corporation, plc
         Telephone:    353-1-709-4000
         Fax:          353-1-709-4124

         and

         Elan International Services, Ltd.
         102 St. James Court
         Flatts, Smiths FL04
         Bermuda
         Attention:  President
         Telephone:  441-292-9169
         Fax:  441-292-2224
                                      -41-

<PAGE>

         Sheffield at:

         Sheffield Pharmaceuticals Inc.
         425 South Woodsmill Road
         St. Louis, MO 63017
         Attention:  President
         Telephone:  314-579-9899
         Fax:  314-579-9799

         and

         3136 Winton Road, Suite 306
         Rochester, NY 14623
         Attention:  Chairman
         Telephone:  716-292-0310
         Fax:  716-292-0522

         with a copy to:

         Daniel J. Gallagher, Esq.
         Olshan, Grundman, Frome, Rosenzweig & Wolosky LLP
         505 Park Avenue
         New York, NY 10022
         Telephone:  212-753-7200
         Fax:  212-935-1787

         Newco at:

         102 St. James Court
         Flatts, Smiths FL04
         Bermuda
         Attention:   Secretary
         Telephone:   441-292-9169
         Fax:         441-292-2224

         and to

         Clarendon House
         2 Church St.
         Hamilton, Bermuda

         or to such other  address(es)  as may from time to time be  notified by
         any Party to the others hereunder.

                                      -42-

<PAGE>

         Any notice sent by mail shall be deemed to have been  delivered  within
         three Business Days after dispatch or delivery to the relevant  courier
         and any notice sent by telecopy  shall be deemed to have been delivered
         upon  confirmation  of receipt.  Notices of change of address  shall be
         effective  upon  receipt.  Notices  by  telecopy  shall also be sent by
         another method permitted hereunder.

24.8     Governing Law; Arbitration

         24.8.1.  This   Agreement   shall  be  governed  by  and  construed  in
                  accordance with the laws of the State of New York.

         24.8.2.  The Parties  will attempt in good faith to resolve any dispute
                  arising  out of or  relating  to this  Agreement  promptly  by
                  negotiation  between  executives of the Parties.  In the event
                  that such negotiations do not result in a mutually  acceptable
                  resolution,  the  Parties  agree  to  consider  other  dispute
                  resolution mechanisms including mediation.


         24.8.3   Any  dispute  under  this  Agreement  which is not  settled by
                  mutual consent under Clause 24.8.2 shall be finally settled by
                  binding   arbitration,   conducted  in  accordance   with  the
                  Commercial  Arbitration  Rules  of  the  American  Arbitration
                  Association  by one  arbitrator  appointed in accordance  with
                  said rules.  Such arbitrator shall be reasonably  satisfactory
                  to each of the  Parties;  provided,  that if the  Parties  are
                  unable to agree upon the identity of such arbitrator within 15
                  days of demand by either  Party,  then either Party shall have
                  the right to petition a presiding justice of the Supreme Court
                  of New York, New York County, to appoint an arbitrator.

                  The  arbitration  shall be held in New York,  New York and the
                  arbitrator  shall be an independent  expert in  pharmaceutical
                  product   development   and  marketing   (including   clinical
                  development and regulatory affairs).

                  The  arbitrator   shall   determine  what  discovery  will  be
                  permitted,  consistent  with the goal of limiting the cost and
                  time which the Parties must expend for discovery; provided the
                  arbitrator  shall permit such discovery as they deem necessary
                  to permit an equitable resolution of the dispute.

                  Any  written  evidence  originally  in a  language  other than
                  English shall be submitted in English translation  accompanied
                  by the original or a true copy thereof.

                  The costs of the  arbitration,  including  administrative  and
                  arbitrators'  fees, shall be shared equally by the Parties and
                  each  Party  shall  bear  its own  costs  and  attorneys'  and
                  witness' fees incurred in connection with the arbitration.


                                      -43-
<PAGE>

                  In rendering judgement,  the arbitrator shall be instructed by
                  the Parties that he shall be  permitted to select  solely from
                  between the  proposals for  resolution  of the relevant  issue
                  presented by each Party, and not any other proposal.

                  A disputed  performance or suspended  performances pending the
                  resolution of the arbitration must be completed within 30 days
                  following the final decision of the  arbitrators or such other
                  reasonable  period as the  arbitrators  determine in a written
                  opinion.

                  Any arbitration under this Agreement shall be completed within
                  one year from the  filing  of  notice  of a  request  for such
                  arbitration.

                  The arbitration proceedings and the decision shall not be made
                  public without the joint consent of the Parties and each Party
                  shall maintain the  confidentiality  of such  proceedings  and
                  decision unless otherwise permitted by the other Party.

                  The  Parties  agree  that  the  decision  shall  be the  sole,
                  exclusive and binding  remedy  between them  regarding any and
                  all   disputes,   controversies,   claims  and   counterclaims
                  presented to the  arbitrators.  Application may be made to any
                  court  having  jurisdiction  over the  Party  (or its  assets)
                  against   whom  the   decision  is  rendered  for  a  judicial
                  recognition of the decision and an order of enforcement.

24.9     Severability:

         If any  provision  in this  Agreement  is agreed by the  Parties to be,
         deemed to be or becomes invalid,  illegal,  void or unenforceable under
         any law  that is  applicable  hereto,  such  provision  will be  deemed
         amended to conform to applicable laws so as to be valid and enforceable
         or,  if it  cannot  be  so  amended  without  materially  altering  the
         intention of the Parties, it will be deleted, with effect from the date
         of such  agreement or such  earlier date as the Parties may agree,  and
         the validity,  legality and enforceability of the remaining  provisions
         of this Agreement shall not be impaired or affected in any way.

24.10    Amendments:

         No  amendment,  modification  or addition  hereto shall be effective or
         binding on any Party unless set forth in writing and executed by a duly
         authorized representative of all Parties.

24.11    Waiver:

         No waiver of any right under this Agreement  shall be deemed  effective
         unless contained in a written document signed by the Party charged with
         such waiver, and no waiver of any breach or failure to perform shall be
         deemed to be a waiver of any future  breach or failure to perform or of
         any other right arising under this Agreement.

                                      -44-

<PAGE>

24.12    Assignment:

         None of the  Parties  shall  be  permitted  to  assign  its  rights  or
         obligations  hereunder  without the prior written  consent of the other
         Parties  except as follows  (in which  case,  written  notice  shall be
         delivered by the assigning Party to the other Parties):

         24.12.1  Elan,  EIS  and/or  Sheffield  shall  have the right to assign
                  their rights and  obligations  hereunder  to their  Affiliates
                  provided,  however,  that such  assignment  does not result in
                  adverse tax consequences for any other Parties.

         24.12.2  Elan and EIS shall have the right to assign  their  rights and
                  obligations  hereunder to any  Affiliate.  Each  assignee must
                  comply with the  representations  and warranties in clause 3.5
                  hereof.

24.13    Whole Agreement/No Effect on Other Agreements:

         This  Agreement  (including  the  Schedules  attached  hereto)  and the
         Transaction   Documents   set   forth   all  of  the   agreements   and
         understandings  between the Parties with respect to the subject  matter
         hereof,   and  supersedes  and  terminates  all  prior  agreements  and
         understandings  between the Parties with respect to the subject  matter
         hereof.  There are no agreements or understandings  with respect to the
         subject  matter  hereof,  either oral or  written,  between the Parties
         other  than  as  set  forth  in  this  Agreement  and  the  Transaction
         Documents.

         In the event of any ambiguity or conflict  arising between the terms of
         this  Agreement  and  those of the  Newco  Bye-Laws,  the terms of this
         Agreement  shall  prevail,  except with  respect to Clause 21, in which
         case the terms of the Newco Bye-laws shall govern.

         No  provision  of this  Agreement  shall be  construed so as to negate,
         modify  or  affect in any way the  provisions  of any  other  agreement
         between any of the Parties unless specifically  referred to, and solely
         to the extent provided  herein.  In the event of a conflict between the
         provisions  of  this  Agreement  and  the  provisions  of  the  License
         Agreements,  the terms of this  Agreement  shall  prevail  unless  this
         Agreement specifically provide otherwise.

24.14    Successors:

         This  Agreement  shall be binding  upon and inure to the benefit of the
         Parties hereto, their successors and permitted assigns.


                                      -45-
<PAGE>
                                   SCHEDULE 1

                             ELAN LICENSE AGREEMENT







<PAGE>
                                   SCHEDULE 2

                           SHEFFIELD LICENSE AGREEMENT












<PAGE>
                                   SCHEDULE 3

                        TECHNOLOGICAL COMPETITORS OF ELAN


[REDACTED]


<PAGE>
                                   SCHEDULE 4

                     TECHNOLOGICAL COMPETITORS OF SHEFFIELD


[REDACTED]


<PAGE>
IN WITNESS  WHEREOF,  the Parties hereto have executed this Agreement on the day
first set forth above.

                                          SIGNED


                                          BY:/s/
                                             -----------------------------------
                                          for and on behalf of
                                          ELAN PHARMA INTERNATIONAL LTD.
                                          in the presence of:__________________


                                          SIGNED

                                          BY:/s/
                                             -----------------------------------

                                          for and on behalf of
                                          ELAN INTERNATIONAL SERVICES, LTD.
                                          in the presence of:__________________


                                          SIGNED

                                          BY:/s/
                                             -----------------------------------

                                          for and on behalf of
                                          SHEFFIELD PHARMACEUTICALS, INC.
                                          in the presence of:__________________


                                          SIGNED

                                          BY:/s/
                                             -----------------------------------

                                          for and on behalf of
                                          SHEFFIELD NEWCO, LTD.
                                          in the presence of:__________________












                                LICENSE AGREEMENT


                                     BETWEEN


                         SHEFFIELD PHARMACEUTICALS, INC.


                                       AND


                             SHEFFIELD NEWCO LIMITED








<PAGE>
                                TABLE OF CONTENTS



1.                DEFINITIONS
2.                SHEFFIELD LICENSE TO NEWCO
3.                INTELLECTUAL PROPERTY
4.                NON-COMPETITION/AFTER ACQUIRED TECHNOLOGY
5.                FINANCIAL PROVISIONS
6.                RIGHT OF INSPECTION AND AUDIT
7.                REPRESENTATIONS AND WARRANTIES
8.                TERM AND TERMINATION
9.                CONFIDENTIAL INFORMATION
10.               GOVERNING LAW AND JURISDICTION
11.               IMPOSSIBILITY OF PERFORMANCE - FORCE MAJEURE
12.               ASSIGNMENT
13.               NOTICES
14.               MISCELLANEOUS



                                       2
<PAGE>
THIS AGREEMENT made this 19 October 1999

between:

(1)      Sheffield  Pharmaceuticals,  Inc., a corporation duly  incorporated and
         validly  existing  under the laws of Delaware and having its  principal
         place of business at 425 S. Woodsmill  Road,  Suite 270, St. Louis,  MO
         63017, USA("Sheffield");

(2)      Newco Limited, a private limited company incorporated under the laws of
         Bermuda and having its registered  office at Clarendon  House, 2 Church
         Street, Hamilton, Bermuda ("Newco"); and

(3)      Elan  Pharma  International  Limited  incorporated  under  the  laws of
         Ireland,  and  having  its  registered  office  at WIL  House,  Shannon
         Business Park, Shannon, County Clare, Ireland ("EPIL").


RECITALS:

A.       Simultaneously herewith,  Sheffield,  Elan, EIS, and Newco are entering
         into the JDOA for the purpose of recording the terms and  conditions of
         the joint venture and of regulating their  relationship with each other
         and certain aspects of the affairs of, and their dealings with Newco.

B.       Newco  desires to enter into this  Agreement  with  Sheffield  so as to
         permit Newco to utilize the Sheffield  Intellectual Property in making,
         having  made,  importing,  using,  offering  for sale and  selling  the
         Products in Field B and  Formulations  in Field C in the  Territory  in
         accordance with the terms of this Agreement.

C.       Simultaneously  herewith  Newco  and  EPIL are  entering  into the Elan
         License  Agreement  relating  to Newco's  use of the Elan  Intellectual
         Property.


1        DEFINITIONS

1.1      In this Agreement unless the context otherwise requires:

         "Affiliate"   shall  mean  any   corporation  or  entity   controlling,
         controlled  or under the common  control of Elan or  Sheffield,  as the
         case  may be,  excluding  Systemic  Pulmonary  Delivery  Ltd..  For the
         purpose of this  definition,  "control"  shall mean  direct or indirect
         ownership  of  fifty  percent  (50%)  or more of the  stock  or  shares
         entitled  to vote  for  the  election  of  directors.  Newco  is not an
         Affiliate of Sheffield.

         "Agreement"  shall mean this license  agreement (which expression shall
         be deemed to include the Recitals and Schedules hereto).

                                       3
<PAGE>
         "Business Plan" shall have the meaning,  as such term is defined in the
         JDOA.

         "Combined Fields" shall mean Field A, Field B and Field C.

         "Compounds"  shall  mean the Field A  Compound,  the  Field B  Compound
         and/or the Field C Compound.

         "Confidential  Information"  shall  have the  meaning,  as such term is
         defined in Clause 9.

         "Definitive Documents" shall mean the definitive agreements relating to
         the transaction including finance, stock purchase, research and license
         agreements.

         "Elan"  shall  mean  EPIL  and  Affiliates  and  subsidiaries  of  Elan
         Corporation,  Plc.  within  the  division  of  Elan  Corporation,  Plc.
         carrying on business as Elan Pharmaceutical  Technologies but shall not
         include  Affiliates  and  subsidiaries  (present  or  future)  of  Elan
         Corporation Plc within the division of Elan  Corporation,  Plc carrying
         on business as Elan  Pharmaceuticals  which  incorporates,  inter alia,
         Targon Corporation,  Athena Neurosciences,  Inc., Elan Pharmaceuticals,
         Inc., Elan Diagnostics, Carnrick Laboratories, and Elan Europe Limited.

         "EIS"  shall  mean  Elan  International  Services,  Limited,  a private
         limited company  incorporated  under the laws of Bermuda and having its
         registered office at St James Court, Flatts, Smiths, FL04 Bermuda.

         "Effective Date" shall mean the date of this Agreement.

         "Elan  Intellectual  Property"  shall mean the Elan Know-How,  the Elan
         Patents  and the Elan  Improvements,  as such terms are  defined in the
         Elan License Agreement.

         "Elan  Patents"  shall have the  meaning as such term is defined in the
         Elan License Agreement.

         "Elan  Improvements"  shall have the meaning as such term is defined in
         the Elan License Agreement.

         "Elan  Licenses"  shall have the meaning set forth in Clause 2.1 of the
         Elan License Agreement.

         "Elan License Agreement" shall mean that certain license agreement,  of
         even date herewith, entered into between Elan and Newco.

         "Field A" shall mean the topical pulmonary  delivery of Formulations of
         the Field A Compound by means of the Field A Device.

         "Field B" shall mean the topical pulmonary  delivery of Formulations of
         the Field B Compound by means of the Field B Device.

                                       4
<PAGE>

         "Field C" shall mean the topical pulmonary  delivery of Formulations of
         the Field C Compound by means of the Field C Device.

         "Field A Device" shall mean a third party table top unit dose nebulizer
         having a  reservoir  capable  of  holding a unit dose (a device and the
         compressor to nebulize a unit dose shall be deemed a device),  which is
         a device having any one the following characteristics:

         (i)      [REDACTED]

         (ii)     [REDACTED]

         (iii)    [REDACTED]

         (iv)     [REDACTED]

         (v)      [REDACTED]

         For the  avoidance  of doubt,  the Field A Device  does not include
         [REDACTED].

         "Field B Device" shall mean the Aerosol Drug Delivery System  ("ADDS"),
         owned by Systemic Pulmonary  Delivery Limited and exclusively  licensed
         to Sheffield for topical pulmonary applications.

         "Field C Device" shall mean the handheld  multi-dose  nebulizer ("MSI")
         which was licensed  exclusively by Siemens to Sheffield pursuant to the
         Siemens Agreements and which was subsequently sub-licensed by Sheffield
         to Zambon (on an exclusive basis for delivery of various  medicines for
         humans in  treating  respiratory  disease  and/or  other lung  diseases
         including,  but not limited to,  anti-infectives)  provided that Newco,
         through  the  Management  Committee,   is  successful  in  obtaining  a
         sub-license  from Zambon to Newco enabling the  development  and use of
         the Field C Compound  for use with the Field C Device , as described in
         more detail in Clause 2.2.

         "Field A Compound" shall mean [REDACTED].

         "Field B  Compound"  shall  mean  [REDACTED] for therapeutic  use to be
         nominated  by the  Management  Committee  pursuant to the JDOA and with
         reference to the JDOA, any Substitute Field B Compound.

         "Field C Compound"  shall mean  [REDACTED]  and with  reference  to the
         JDOA, any  Substitute  Field C Compound  and/or any Additional  Field C
         Compound.

         "Financial  Year" shall mean each year  commencing  on 1 January (or in
         the case of the first  Financial Year, the Effective Date) and expiring
         on 31 December of each year.

         "Formulations"  shall mean Nanocrystal(TM)  Technology  formulations of
         Compounds for use in Field A, Field B or Field C, as applicable.


                                       5
<PAGE>

         "JDOA"  shall  mean  that  certain  joint   development  and  operating
         agreement,  of even date herewith, by and between Elan, Sheffield,  EIS
         and Newco.

         "Licensed  Technologies" shall mean the Elan Intellectual  Property and
         the Sheffield Intellectual Property.

         "Licenses" shall mean the Elan License and the Sheffield License.

         "Management  Committee" shall have the meaning, as such term is defined
         in the JDOA.

         "Nanocrystal(TM) Technology" shall mean the Elan proprietary technology
         directed  to  nanoparticulate  formulations  of  compounds  used in the
         manufacturing  and/or  formulation  process,  and methods of making the
         same.

         "Newco  Intellectual  Property"  shall  mean  all  rights  to  patents,
         know-how and other intellectual  property arising out of the conduct of
         the Project by any person,  including any technology  acquired by Newco
         from a third party, that does not constitute Elan Intellectual Property
         or Sheffield Intellectual Property.

         "Newco Patents" shall mean any and all patents now existing,  currently
         pending  or  hereafter   filed  or  obtained   relating  to  the  Newco
         Intellectual  Property,  and any foreign  counterparts  thereof and all
         divisionals,   continuations,    continuations-in-part,   any   foreign
         counterparts  thereof and all patents issuing on, any of the foregoing,
         together  with  all   registrations,   reissues,   re-examinations   or
         extensions thereof.

         "Party"  shall  mean  Sheffield  or  Newco,  as the  case  may be,  and
         "Parties" shall mean Sheffield and Newco.

         "Products" shall mean the Field A Products, the Field B Products and/or
         the Field C Products, as follows:

         "Field A  Products"  shall  mean  Formulations  of the Field A Compound
         delivered by means of any Field A Device in Field A.

         "Field B  Products"  shall  mean  Formulations  of the Field B Compound
         delivered by means of the Field B Device in Field B.

         "Field C  Products"  shall  mean  Formulations  of the Field C Compound
         delivered by means of the Field C Device in Field C.

         "Project"  shall mean all  activities as undertaken by Elan,  Sheffield
         and Newco in order to develop the Products.

         "R&D Committee" shall have the meaning,  as such term is defined in the
         JDOA.

                                       6
<PAGE>

         "R&D Plan" shall have the meaning, as such term is defined in the JDOA.

         "R&D Program" shall mean any research and development program commenced
         by Newco pursuant to the Project.

         "Sheffield"   shall  mean  Sheffield   Pharmaceuticals,   Inc  and  its
         Affiliates, excluding Newco.

         "Sheffield  Devices"  shall  mean the  Field B Device  and the  Field C
         Device.

         "Sheffield  Intellectual  Property" shall mean the Sheffield  Know-How,
         the Sheffield Patents and the Sheffield Improvements.

         "Sheffield  Know-How" shall mean any and all rights owned,  licensed or
         controlled by Sheffield to any discovery, invention (whether patentable
         or not), know-how,  substances, data, techniques,  processes,  systems,
         formulations and designs relating exclusively to the Sheffield Devices.

         "Sheffield Licenses" shall have the meaning set forth in Clause 2.1.

         "Sheffield  Patents"  shall mean any and all  rights  under any and all
         patents applications and/or patents, now existing, currently pending or
         hereafter  filed or obtained  by  Sheffield  relating to the  Sheffield
         Devices and all divisionals, continuations,  continuations-in-part, any
         foreign  counterparts  thereof and all  patents  issuing on, any of the
         foregoing, together with all registrations,  reissues,  re-examinations
         or extensions thereof.

         "Sheffield  Improvements"  shall  mean  improvements  relating  to  the
         Sheffield  Patents  and/or the  Sheffield  Know-How,  developed  (i) by
         Sheffield whether or not pursuant to the Project, (ii) by Newco or Elan
         or by a third party (under contract with Newco) whether or not pursuant
         to the Project,  and/or (iii) jointly by any  combination of Sheffield,
         Elan or Newco pursuant to the Project,  except as limited by agreements
         with third Parties.

         Subject  to  third  party  agreements,   Sheffield  Improvements  shall
         constitute part of Sheffield  Intellectual  Property and be included in
         the license of the Sheffield  Intellectual  Property pursuant to Clause
         2.1 solely for the purposes set forth  therein.  If the  inclusion of a
         Sheffield Improvement in the license of Sheffield Intellectual Property
         is restricted or limited by a third party  agreement,  Sheffield  shall
         use reasonable  commercial  efforts to minimize any such restriction or
         limitation.

         "Siemens" shall mean Siemens Aktiengesellschaft.

         "Siemens  Agreements"  shall mean the License  Agreement dated 21 March
         1997 and the Basic Supply  Agreement  dated 21 March 1997, both between
         Sheffield Medical Technologies Inc. and Siemens Aktiengesellschaft.

         "Technological   Competitor  of   Sheffield"   shall  mean  a  company,
         corporation  or person listed in Schedule 1 and  successors  thereof or

                                       7

<PAGE>

         any additional broad-based  technological competitor of Sheffield added
         to such  Schedule  1 from time to time  upon  mutual  agreement  of the
         Parties.

         "Term" shall have the meaning set forth in Clause 8.

         "Territory" shall mean all the countries of the world.

         "United States Dollar" and "US$" shall mean the lawful currency for the
         time being of the United States of America.

         "Zambon" shall mean Inpharzam International, S.A.

         "Zambon  Agreement" shall mean the agreement dated 15 June 1998 between
         Sheffield and Zambon.

1.2      In this Agreement:

         1.2.1    The  singular  includes  the  plural and vice  versa,  and the
                  masculine  includes the feminine and vice versa and the neuter
                  includes the masculine and the feminine.

         1.2.2    Any reference to a Clause or Schedule shall,  unless otherwise
                  specifically  provided,  be to a Clause  or  Schedule  of this
                  Agreement.

         1.2.3    The headings of this  Agreement are for ease of reference only
                  and shall not affect its construction or interpretation.

2.       SHEFFIELD LICENSE TO NEWCO

2.1.     Sheffield hereby grants to Newco for the Term the following licenses:

         2.1.1    a  non-exclusive   license   (including  the  right  to  grant
                  sublicenses  subject to the  limitations of Clause 2.7) of the
                  Sheffield  Intellectual  Property  solely to make,  have made,
                  import,  use,  offer for sale and sell the Field B Products in
                  the Territory in Field B;

         2.1.2    subject  to the  execution  by Newco of a written  sub-license
                  with  Zambon as more  fully  described  in Clause  2.2 for the
                  development by Newco of the Field C Formulations in accordance
                  with Clause 2.2, a non-exclusive  license (including the right
                  to grant sublicenses  subject to the limitations of Clause 2.7
                  and  the  Zambon  Agreement)  of  the  Sheffield  Intellectual
                  Property solely to make and have made, import,  use, offer for
                  sale and sell the Field C Products in the Territory in Field C

         (the "Sheffield Licenses").

                                       8
<PAGE>

2.2      On the date which is [REDACTED]  days following the Effective  Date, or
         such  extended  date as may be  agreed  in  writing  by Elan and  Newco
         pursuant to Clause 2.2 of the Elan License Agreement,  Sheffield shall,
         at its sole discretion,  be entitled forthwith to terminate the license
         to Newco described in Clause 2.1.2, upon notice in writing to Newco, in
         the event  that Newco has not,  prior to such date,  executed a written
         sub-license  with  Zambon for the  development  by Newco of the Field C
         Formulations in Field C.

         Sheffield  shall use  reasonable  commercial  efforts to  procure  that
         Zambon executes such written  sub-license with Newco in a timely manner
         and in any event within 180 days following the Effective  Date, or such
         extended date as may be agreed in writing by Elan and Newco pursuant to
         Clause 2.2 of the Elan License Agreement.

         Such  written  sub-license  will  be  subject  to the  approval  of the
         Management Committee and will include authority from Zambon to Newco to
         the extent necessary for Newco to develop,  make, have made and use the
         Field  C  Formulations  in  the  Territory,  general  financial  terms,
         development schedule,  and terms governing the funding by Zambon of any
         R&D Program(s) in Field C, together with such other substantive  issues
         as the Management Committee shall deem appropriate and customary terms.

         For the avoidance of doubt, to the extent royalty or other compensation
         obligations  are  payable  to  Zambon  in  respect  of any  license  or
         sub-license  from  Zambon  to Newco  of  intellectual  property  rights
         necessary  for Newco to  develop,  make,  have made and use the Field C
         Formulations in the Territory,  Sheffield shall be responsible for same
         and shall  indemnify  Newco in  respect  of any such  royalty  or other
         compensation obligations payable to Zambon.

2.3      Sheffield  shall be responsible  for payments  related to the financial
         provisions and obligations of any third party agreement with respect to
         the  Sheffield  Intellectual  Property  to  which  it is a party on the
         Effective Date (including amendments thereto) (the "Sheffield Effective
         Date Agreements"),  including without limitation,  any royalty or other
         compensation obligations triggered thereunder on the Effective Date, or
         triggered thereunder after the Effective Date.

         For the avoidance of doubt,  royalties,  milestones  or other  payments
         which arise from the process of the  commercialization  or exploitation
         of products under the Sheffield Effective Date Agreements (for example,
         a milestone  payment  payable upon  successful  completion  of Phase II
         clinical  trials,  the  filing  of an NDA  application,  obtaining  NDA
         approval,  or first  commercial  sale)  shall  be  payments  for  which
         Sheffield will be responsible under this Clause 2.1.

2.4      Subject to  Sheffield's  obligations  and indemnity set forth in Clause
         2.2 to the extent royalty or other compensation obligations are payable
         to Zambon in respect of any license or sub-license from Zambon to Newco
         of intellectual  property rights necessary for Newco to develop,  make,
         have made and use the Field C  Formulations  in the  Territory,  to the
         extent royalty or other  compensation  obligations  that are payable to
         third parties with respect to the Sheffield Intellectual Property would

                                       9
<PAGE>

         be triggered  after the Effective Date under any third party  agreement
         entered  into by Sheffield  after the  Effective  Date (the  "Sheffield
         Post-Effective  Date Agreements"),  by a proposed use of such Sheffield
         Intellectual  Property in connection  with the Project,  Sheffield will
         inform  Newco of such  royalty or  compensation  obligations.  If Newco
         agrees to utilise such  Sheffield  Intellectual  Property in connection
         with the  Project,  Newco will be  responsible  for the payment of such
         royalty or other compensation obligations relating thereto.

         For the avoidance of doubt,  royalties,  milestones  or other  payments
         which arise from the process of the  commercialization  or exploitation
         of products under the Sheffield  Post-Effective  Date  Agreements  (for
         example,  a milestone  payment  payable upon  successful  completion of
         Phase II clinical trials,  the filing of an NDA application,  obtaining
         NDA  approval,  or first  commercial  sale) shall be payments for which
         Newco will be responsible under this Clause 2.4.

2.5      Elan shall be a third party  beneficiary under this Agreement and shall
         have the right to cause  Newco to  enforce  Newco's  rights  under this
         Agreement against Sheffield.

2.6      Notwithstanding  anything  contained in this Agreement to the contrary,
         Sheffield  shall  have the  right  outside  the Field B and Field C and
         subject to the  non-competition  provisions  of Clause 4 to exploit and
         grant licenses and sublicenses of the Sheffield Intellectual Property.

         For the  avoidance  of  doubt,  Newco  shall  have no  right to use the
         Sheffield Intellectual Property outside Field B or Field C.

2.7      Newco shall not be permitted to assign or sublicense  any of its rights
         under the  Sheffield  Intellectual  Property  without the prior written
         consent of Sheffield,  which consent shall not be unreasonably withheld
         or delayed  provided  that  Sheffield  shall in all cases,  in its sole
         discretion,  be  entitled  to  withhold  its  consent  in the case of a
         proposed  sublicense  to any  Technological  Competitor  to  Sheffield.

2.8      Any  agreement  between  Newco and any  permitted  third  party for the
         development  or  exploitation  of the Sheffield  Intellectual  Property
         shall require such third party to maintain the  confidentiality  of all
         information concerning the Sheffield Intellectual Property.

         Insofar as the  obligations  owed by Newco to Sheffield are  concerned,
         Newco  shall  remain  responsible  for all  acts and  omissions  of any
         permitted  sub-licensee,  including  Elan,  as if they  were  acts  and
         omissions by Newco.

3        INTELLECTUAL PROPERTY

3.1      Ownership of Intellectual Property:

         3.1.1    Newco shall own the Newco Intellectual Property.


                                       10
<PAGE>

         3.1.2    Sheffield shall own the Sheffield Intellectual Property.

3.2      Trademarks:

         3.2.1    Sheffield hereby grants to Newco for the Term a non-exclusive,
                  royalty free  license in the  Territory to use and display the
                  Sheffield  Trademarks to promote,  offer for sale and sell the
                  Products  in  Field  B in  the  Territory  and  the  following
                  provisions  shall  apply as regards  the use of the  Sheffield
                  Trademarks by Newco hereunder:

                  (1)   Newco shall ensure that each  reference to and use of an
                        Sheffield  Trademark by Newco is in a manner approved by
                        Sheffield and  accompanied by an  acknowledgement,  in a
                        form approved by Sheffield, that the same is a trademark
                        (or registered trademark) of Sheffield.

                        From  time to  time,  upon  the  reasonable  request  of
                        Sheffield,  Newco shall submit samples of the Product to
                        Sheffield  or  its  duly   appointed   agent  to  ensure
                        compliance  with quality  standards and  specifications.
                        Sheffield,  or its duly appointed agent,  shall have the
                        right  to  inspect  the  premises  of  Newco  where  the
                        Products  are  manufactured,  held or stored,  and Newco
                        shall permit such inspection, upon advance notice at any
                        reasonable  time, of the methods and procedures  used in
                        the manufacture,  storage and sale of the Product. Newco
                        shall not sell or otherwise dispose of any Product under
                        the Sheffield  Trademarks  that fails to comply with the
                        quality standards and specifications referred to in this
                        Clause 3.2, as determined by Sheffield.

                  (2)   Newco shall not use an  Sheffield  Trademark  in any way
                        which might materially  prejudice its distinctiveness or
                        validity or the goodwill of Sheffield therein.

                  (3)   The parties recognize that the Sheffield Trademarks have
                        considerable goodwill associated therewith.  Newco shall
                        not use in relation to the Products any trademarks other
                        than  the   Sheffield   Trademarks   (except   the  Elan
                        Trademarks  (as defined in the Elan  License  Agreement)
                        licensed  to Newco  under  the Elan  License  Agreement)
                        without  obtaining  the  prior  consent  in  writing  of
                        Sheffield,   which  consent  may  not  be   unreasonably
                        withheld.  However,  such use must not conflict with the
                        use and display of the Sheffield  Trademark and such use
                        and display must be approved by Sheffield.

                  (4)   Newco shall not use in the Territory  any  trademarks or
                        trade names so resembling the Sheffield  Trademark as to
                        be likely to cause confusion or deception.

                  (5)   Newco shall promptly notify  Sheffield in writing of any
                        alleged  infringement  or  unauthorised  use of which it

                                       11
<PAGE>

                        becomes   aware  by  a  third  party  of  the  Sheffield
                        Trademarks  and provide  Sheffield  with any  applicable
                        evidence of infringement or unauthorised use.

                  (6)   Newco shall not be permitted to assign or sublicense any
                        of its rights under the Sheffield Trademarks without the
                        prior written consent of Sheffield,  which consent shall
                        not be unreasonably withheld or delayed.

         3.2.2    Sheffield shall, at its expense and sole discretion,  file and
                  prosecute  applications to register and maintain registrations
                  of the  Sheffield  Trademarks  in the  Territory.  Newco shall
                  reasonably  co-operate with Sheffield in such efforts.  In the
                  event  Sheffield   decides  not  to  file  or  prosecute  such
                  Sheffield  Trademark,  Newco may request  Sheffield  to do the
                  same at Newco's expense, and Sheffield shall file or prosecute
                  such Sheffield Trademark at Newco's request and expense unless
                  Sheffield believes such action is without merit.

         3.2.3    Sheffield   will  be  entitled  to  conduct  all   enforcement
                  proceedings  relating to the Sheffield Trademarks and shall at
                  its sole  discretion  decide what  action,  if any, to take in
                  respect  to  any  enforcement  proceedings  of  the  Sheffield
                  Trademarks  or any other  claim or  counter-claim  brought  in
                  respect  to  the  use  or   registration   of  the   Sheffield
                  Trademarks.   Any  such  proceedings  shall  be  conducted  at
                  Sheffield's  expense  and  for  its  own  benefit.  Newco  and
                  Sheffield  shall  reasonably  cooperate with Sheffield in such
                  efforts.  In the  event  Sheffield  decides  not to  engage in
                  enforcement proceedings of the Sheffield Trademarks, Newco may
                  request  Sheffield  to do the same at Newco's  expense  unless
                  Sheffield believes the basis for such enforcement  proceedings
                  is without  merit.  In such a case,  Sheffield  shall have the
                  sole  discretion  not  to  engage  in  any  such   enforcement
                  proceedings

         3.2.4    Save where Newco  adopts its own mark under Clause  3.2.4,  in
                  the event Newco becomes aware that any Sheffield Trademark has
                  been   challenged   by  a  third   party  in  a  judicial   or
                  administrative  proceeding  in a country in the  Territory  as
                  infringing on the rights of a third party Newco shall promptly
                  notify Sheffield in writing and Sheffield shall have the first
                  right to decide whether or not to defend such allegations,  or
                  to  adopt an  alternative  mark,  or  allow  Newco to adopt an
                  alternative   mark.  If  Sheffield   decides  not  defend  the
                  Sheffield  Trademark,  then  Newco may  request  Sheffield  to
                  defend the Sheffield  Trademark,  at Newco's  expense,  unless
                  such requested defense is reasonably  believed by Sheffield to
                  be  unsubstantiated   and  without  merit.  In  such  a  case,
                  Sheffield may elect not to initiate defence proceedings.

         3.2.5    Newco  will  have  no  ownership  rights  in  respect  of  the
                  Sheffield Trademarks or of the goodwill associated  therewith,
                  and  Newco  hereby  acknowledges  that,  except  as  expressly
                  provided in this Agreement, it shall not acquire any rights in
                  respect thereof and that all such rights and goodwill are, and
                  will remain, vested in Sheffield.

         3.2.6    Nothing in this Agreement  shall be construed as a warranty on
                  the part of  Sheffield  regarding  the  Sheffield  Trademarks,

                                       12

<PAGE>

                  including  without  limitation,  that  use  of  the  Sheffield
                  Trademarks  in the  Territory  will not infringe the rights of
                  any third parties. Accordingly,  Newco acknowledges and agrees
                  that Sheffield makes no such warranty.

         3.2.7    Sheffield  assumes  no  liability  to  Newco  or to any  third
                  parties   with  respect  to  the   quality,   performance   or
                  characteristics  of any of the goods  manufactured  or sold by
                  Newco  under  the  Sheffield   Trademarks   pursuant  to  this
                  Agreement.


4        NON-COMPETITION/AFTER ACQUIRED TECHNOLOGY

4.1      Subject to Clause 4.2 and Clause 8.6,  during the period  during  which
         the license described in Clause 2.1.1 of the Elan License Agreement has
         not been terminated,  Sheffield shall not, alone or in conjunction with
         a third party, develop or commercialize any unit dose steroid listed in
         Schedule  2 for  topical  pulmonary  delivery  using a Field A  Device,
         subject to written  agreements between Sheffield and unaffiliated third
         parties in effect on the Effective Date.

         Sheffield  hereby confirms that no such agreements are in effect on the
         date hereof between Sheffield and an unaffiliated third party.

4.2      If, after the Effective  Date,  Sheffield  acquires  know-how or patent
         rights  relating  to the  Field  A,  Field B or Field C (in the case of
         Field C, subject to the Zambon Agreement), or acquires or merges with a
         third party entity that has know-how or patent  rights  relating to the
         Field A,  Field B or Field C (in the  case of Field C,  subject  to the
         Zambon  Agreement),  Sheffield shall offer to license such know-how and
         patent rights to Newco (subject to existing  contractual  obligations),
         on  commercially  reasonable  terms  on an  arm's  length  basis  for a
         reasonable period under the prevailing circumstances.

         If Newco  determines  that  Newco  should  not  acquire  such  license,
         Sheffield  shall be free to fully  exploit  such  know-how  and  patent
         rights with the Sheffield Intellectual Property then licensed to Newco,
         whether  inside  or  outside  the  Field  A,  Field  B or  Field  C, as
         applicable, and to grant to third parties licenses and sublicenses with
         respect thereto.


5        FINANCIAL PROVISIONS

5.1      Royalties:

         Prior  to  the  commercialization  of  the  Products,   the  Management
         Committee  shall  consider  and if  appropriate,  determine  reasonable
         royalties  with  respect to the  commercialization  of the  Products by
         Newco that shall be payable by Newco to Elan and Sheffield,  and shared
         by Elan and Sheffield equally.

         At such  time,  the  Management  Committee  will  agree an  appropriate
         definition of "Net Sales" as such term is used in this Agreement.

                                       13
<PAGE>


5.2      Payment of any royalties pursuant to Clause 5.1 shall be made quarterly
         in arrears  during each  Financial Year within 30 days after the expiry
         of the  calendar  quarter.  The  method  of  payment  shall  be by wire
         transfer to an account  specified  by  Sheffield.  Each payment made to
         Sheffield  shall be  accompanied  by a true  accounting of all Products
         sold by Newco's permitted sublicensees, if any, during such quarter.

         Such   accounting   shall   show,   on   a    country-by-country    and
         Product-by-Product  basis, Net Sales (and the calculation  thereof) and
         each  calculation  of royalties  with respect  thereto,  including  the
         calculation of all adjustments and currency conversions.

5.3      Newco shall maintain and keep clear, detailed,  complete,  accurate and
         separate records for a period of 3 years:

         5.3.1    to enable any  royalties  on Net Sales that shall have accrued
                  hereunder to be determined; and

         5.3.2    to enable any deductions made in the Net Sales  calculation to
                  be determined.

5.4      All  payments due  hereunder  shall be made in United  States  Dollars.
         Payments due on Net Sales of any Product for each calendar quarter made
         in  a  currency  other  than  United  States  Dollars  shall  first  be
         calculated in the foreign  currency and then converted to United States
         Dollars on the basis of the exchange rate in effect on the last working
         day for such  quarter for the  purchase of United  States  Dollars with
         such foreign  currency quoted in the Wall Street Journal (or comparable
         publication  if not quoted in the Wall Street  Journal) with respect to
         the currency of the country of origin of such  payment,  determined  by
         averaging the rates so quoted on each business day of such quarter.

5.5      If, at any time, legal restrictions in the Territory prevent the prompt
         payment when due of royalties or any portion thereof, the Parties shall
         meet to discuss suitable and reasonable  alternative  methods of paying
         Sheffield  the  amount of such  royalties.  In the event  that Newco is
         prevented from making any payment under this Agreement by virtue of the
         statutes,  laws,  codes or government  regulations  of the country from
         which the  payment  is to be made,  then such  payments  may be paid by
         depositing  them in the  currency in which they  accrue to  Sheffield's
         account in a bank  acceptable  to Sheffield in the country the currency
         of which is involved or as otherwise agreed by the Parties.

5.6      Sheffield and Newco agree to  co-operate  in all respects  necessary to
         take advantage of any double taxation  agreements or similar agreements
         as may, from time to time, be available.

5.7      Any  taxes  payable  by  Sheffield  on any  payment  made to  Sheffield
         pursuant to this Agreement shall be for the account of Sheffield. If so
         required by applicable law, any payment made pursuant to this Agreement
         shall be made by Newco after deduction of the  appropriate  withholding
         tax,  in which  event  the  Parties  shall  co-operate  to  obtain  the
         appropriate tax clearance as soon as is practicable. On receipt of such
         clearance,  Newco shall  forthwith  arrange payment to Sheffield of the
         amount so withheld.


                                       14
<PAGE>

6        RIGHT OF INSPECTION AND AUDIT

6.1      Once during each Financial Year, or more often not to exceed  quarterly
         as reasonably  requested by Sheffield,  Newco shall permit Sheffield or
         its duly authorised representatives,  upon reasonable notice and at any
         reasonable time during normal business hours, to have access to inspect
         and audit the accounts and records of Newco and any other book, record,
         voucher,  receipt or invoice relating to the calculation of the royalty
         payments on Net Sales submitted to Sheffield.

         Any such  inspection  of  Newco's  records  shall be at the  expense of
         Sheffield,  except that if any such inspection  reveals a deficiency in
         the amount of the royalty  actually paid to Sheffield  hereunder in any
         Financial  Year  quarter  of  [REDACTED]  or more of the  amount of any
         royalty actually due to Sheffield  hereunder,  then the expense of such
         inspection  shall be borne  solely by Newco.  Any amount of  deficiency
         shall be paid promptly to Sheffield by Newco.

         If such  inspection  reveals  a  surplus  in the  amount  of  royalties
         actually paid to Sheffield by Newco,  Sheffield  shall  reimburse Newco
         the surplus within 15 days after determination.

6.2      In the event of any unresolved dispute regarding any alleged deficiency
         or  overpayment  of royalty  payments  hereunder,  the  matter  will be
         referred to an  independent  firm of  chartered  accountants  chosen by
         agreement of Sheffield and Elan for a resolution  of such dispute.  Any
         decision by the said firm of chartered  accountants shall be binding on
         the Parties.

 7       REPRESENTATIONS AND WARRANTIES

7.1      Sheffield  represents  and  warrants  to  Newco  and  Elan,  as of  the
         Effective Date, as follows:

         7.1.1    Sheffield  has the  right  to  grant  the  Sheffield  Licenses
                  subject to the  Zambon  Agreement  in the case of the  license
                  described in Clause 2.1.2;

         7.1.2    there are no  agreements  with any third parties that conflict
                  with the Sheffield Licenses.

7.2      Sheffield  further agrees and represents and warrants to Newco and Elan
         as follows:

         7.2.1    as of the Effective  Date,  each of the Siemens  Agreements is
                  valid and in full force and effect;

         7.2.2    as of the  Effective  Date,  there are no  existing or claimed
                  defaults by Sheffield,  and to  Sheffield's  best knowledge by

                                       15

<PAGE>

                  any other party,  under any of the Siemens  Agreements  and no
                  event,  act or omission  has  occurred  which (with or without
                  notice,  lapse of time or the  happening or  occurrence of any
                  other  event)  would  result  in a default  under the  Siemens
                  Agreements by Sheffield,  or to Sheffield's  best knowledge by
                  any other party;

         7.2.3    during the Term,  Sheffield  will fully comply with all of the
                  terms and conditions of the Siemens Agreements. Sheffield will
                  enforce its rights under the Siemens  Agreements and save with
                  the prior  approval  in  writing of the  Management  Committee
                  which shall not  unreasonably be withheld,  Sheffield will not
                  assign its rights under the Siemens Agreements; and

         7.2.4    during  the Term,  Sheffield  will keep  Newco and Elan  fully
                  informed   with   respect   to    Sheffield's    transactions,
                  arrangements  and business under the Siemens  Agreements  that
                  relate  to  Newco   and/or   the   transactions   contemplated
                  hereunder, and Sheffield shall provide Newco and Elan with any
                  written notices  delivered by any party thereunder that relate
                  to Newco and/or the transactions  contemplated  hereunder,  or
                  that may affect Newco.

7.3      During the Term, Sheffield shall not terminate, amend, modify, or waive
         any of its  rights  under  the  Siemens  Agreements  without  the prior
         written  consent of the Management  Committee (by the unanimous vote of
         its members) provided,  however, that such consent will not be required
         if such termination,  amendment, modification, or waiver would not have
         a material  adverse effect,  individually  or in the aggregate,  on the
         financial  condition,  results of operation,  business and/or assets of
         Newco.

7.4      Sheffield  shall  indemnify Newco and Elan against all costs claims and
         liabilities  which may arise in any way in relation to or in connection
         with  the  Siemens  Agreements  and/or  any  sub-license  agreement  or
         agreements entered into by Newco pursuant to Clause 2.2.

7.5      In addition to any other  indemnities  provided  for herein,  Sheffield
         shall  indemnify and hold harmless  Newco and its  Affiliates and their
         respective employees,  agents,  officers and directors from and against
         any  claims,  losses,  liabilities  or  damages  (including  reasonable
         attorney's  fees and  expenses)  incurred or sustained by Newco arising
         out of or in connection with any:

         7.5.1    breach of any representation, covenant, warranty or obligation
                  by Sheffield hereunder; or

         7.5.2    act  or  omission  on  the  part  of  Sheffield  or any of its
                  respective  employees,  agents,  officers and directors in the
                  performance of this Agreement.

7.6      In addition to any other indemnities  provided for herein,  Newco shall
         indemnify and hold  harmless  Sheffield  and its  Affiliates  and their
         respective employees,  agents,  officers and directors from and against
         any  claims,  losses,  liabilities  or  damages  (including  reasonable
         attorney's  fees and  expenses)  incurred  or  sustained  by  Sheffield
         arising out of or in connection with any:
                                       16

<PAGE>

         7.6.1    breach of any representation, covenant, warranty or obligation
                  by Newco hereunder; or

         7.6.2    act or  omission  on the part of Newco or any of its agents or
                  employees in the performance of this Agreement.

7.7      The Party seeking an indemnity shall:

         7.7.1    fully and  promptly  notify  the  other  Party of any claim or
                  proceeding, or threatened claim or proceeding;

         7.7.2    permit the indemnifying Party to take full care and control of
                  such claim or proceeding;

         7.7.3    co-operate in the  investigation  and defence of such claim or
                  proceeding;

         7.7.4    not   compromise  or  otherwise   settle  any  such  claim  or
                  proceeding  without  the prior  written  consent  of the other
                  Party,  which  consent  shall  not  be  unreasonably  withheld
                  conditioned or delayed; and

         7.7.5    take all reasonable steps to mitigate any loss or liability in
                  respect of any such claim or proceeding.

7.8      EXCEPT  AS SET  FORTH IN THIS  CLAUSE  7,  SHEFFIELD  IS  GRANTING  THE
         LICENSES  HEREUNDER  ON AN "AS  IS"  BASIS  WITHOUT  REPRESENTATION  OR
         WARRANTY   WHETHER   EXPRESS  OR  IMPLIED   INCLUDING   WARRANTIES   OF
         MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, OR INFRINGEMENT OF
         THIRD PARTY RIGHTS, AND ALL SUCH WARRANTIES ARE EXPRESSLY DISCLAIMED.

7.9      EXCEPT AS SET  FORTH IN CLAUSE  7.4,  NOTWITHSTANDING  ANYTHING  TO THE
         CONTRARY IN THIS AGREEMENT,  SHEFFIELD AND NEWCO SHALL NOT BE LIABLE TO
         THE OTHER BY REASON OF ANY  REPRESENTATION  OR  WARRANTY,  CONDITION OR
         OTHER TERM OR ANY DUTY OF COMMON  LAW,  OR UNDER THE  EXPRESS  TERMS OF
         THIS  AGREEMENT,  FOR  ANY  CONSEQUENTIAL,  SPECIAL  OR  INCIDENTAL  OR
         PUNITIVE LOSS OR DAMAGE  (WHETHER FOR LOSS OF PROFITS OR OTHERWISE) AND
         WHETHER OCCASIONED BY THE NEGLIGENCE OF THE RESPECTIVE  PARTIES,  THEIR
         EMPLOYEES OR AGENTS OR OTHERWISE.

                                       17
<PAGE>

8.       TERM AND TERMINATION

8.1      The term of this Agreement  shall commence as of the Effective Date and
         shall, subject to the rights of termination outlined in this Clauses 8,
         expire on a Product-by-Product  basis and on a country-by-country basis
         on the last to occur of:

         8.1.1    [REDACTED]   years   starting  from  the  date  of  the  first
                  commercial sale of the Product in the country concerned; or

         8.1.2    the date of  expiration  of the last to expire of the  patents
                  included  in the Elan  Patents  and/or  the Elan  Improvements
                  and/or the Sheffield Patents and/or the Elan Improvements that
                  relate to the Product.

         ("the Term")

8.2      If either Party commits a Relevant  Event,  the other Party shall have,
         in  addition  to all other  legal and  equitable  rights  and  remedies
         hereunder,  the right to terminate  this  Agreement upon 30 days' prior
         written notice to the defaulting Party.

8.3      For the purpose of this Clause 8, a "Relevant  Event" is  committed  or
         suffered by a Party if:

         8.3.1    [REDACTED]

         8.3.2    [REDACTED]

         8.3.3    [REDACTED]

         8.3.4    [REDACTED]

         8.3.5    [REDACTED]

         8.3.6    [REDACTED]

                                       18
<PAGE>


8.4      Sheffield  shall be entitled to forthwith  terminate  this Agreement if
         Elan elects to terminate the Elan License Agreement under Clause 8.4 of
         the Elan License Agreement.

8.5      Upon expiration or termination of the Agreement:

         8.5.1.   any sums that were due from Newco to Sheffield on Net Sales in
                  the  Territory or in such  particular  country or countries in
                  the Territory (as the case may be) prior to the  expiration or
                  termination  of this  Agreement  as set forth  herein shall be
                  paid  in  full  within  60  days  after  the   expiration   or
                  termination  of this  Agreement  for the Territory or for such
                  particular  country or countries in the Territory (as the case
                  may be);

         8.5.2    any   provisions   that  expressly   survive   termination  or
                  expiration of this  Agreement,  including  without  limitation
                  this Clause 8, shall remain in full force and effect;

         8.5.3    all representations,  warranties and indemnities shall insofar
                  as are appropriate remain in full force and effect;

         8.5.4    the rights of  inspection  and audit set out in Clause 6 shall
                  continue in force for a period of one year; and

         8.5.5    all rights and licenses granted pursuant to this Agreement and
                  to the Sheffield  Intellectual  Property  pursuant to the JDOA
                  (including  the rights of Newco  pursuant  to Clause 11 of the
                  JDOA) shall  cease for the  Territory  or for such  particular
                  country or countries in the Territory (as the case may be) and
                  shall  revert to or be  transferred  to  Sheffield,  and Newco
                  shall  not   thereafter  use  in  the  Territory  or  in  such
                  particular  country or countries in the Territory (as the case
                  may be) any rights covered by this Agreement;

         8.5.6    subject to Clause 8.5.7 and to such license,  if any,  granted
                  by Newco to Sheffield  pursuant to the provisions of Clause 12
                  of the JDOA, all rights to Newco  Intellectual  Property shall
                  be  transferred to and jointly owned by Sheffield and Elan and
                  may only be  exploited  by either Elan or  Sheffield  with the
                  consent of the other Party pursuant to a written  agreement to
                  be negotiated in good faith;

         8.5.7    the rights of permitted  third party  sub-licensees  in and to
                  the  Sheffield   Intellectual   Property   shall  survive  the
                  termination of the license and sublicense  agreements granting
                  said  intellectual  property rights to Newco; and Newco,  Elan
                  and  Sheffield  shall in good  faith  agree upon the form most
                  advantageous  to Elan and  Sheffield  in which  the  rights of
                  Newco under any such licenses and  sublicenses  are to be held
                  (which form may include  continuation  of Newco  solely as the
                  holder of such  licenses  or  assignment  of such  rights to a
                  third party or parties,  including an  assignment to both Elan
                  and Sheffield).


                                       19
<PAGE>

                  Any  sublicense  agreement  between  Newco and such  permitted
                  sublicensee  shall permit an assignment of rights by Newco and
                  shall contain appropriate confidentiality provisions.

8.6      In the event that the Parties and Elan mutually  agree to terminate the
         portion of the Project (as defined in the JDOA) which  relates to Field
         A, the  provisions  of Clause  4.1 and the  provisions  of  Clause  4.2
         (insofar  as the  provisions  of  Clause  4.2  relate to Field A) shall
         automatically terminate.


9        CONFIDENTIAL INFORMATION

9.1      The  Parties  agree that it will be  necessary,  from time to time,  to
         disclose  to  each  other  confidential  and  proprietary  information,
         including without limitation,  inventions,  works of authorship,  trade
         secrets, specifications,  designs, data, know-how and other proprietary
         information  relating to the Combined Fields, the Products,  processes,
         services and business of the disclosing Party.

         The  foregoing  shall be  referred  to  collectively  as  "Confidential
         Information".

9.2      Any  Confidential  Information  disclosed by one Party to another Party
         shall be used by the receiving  Party  exclusively  for the purposes of
         fulfilling the receiving  Party's  obligations under this Agreement and
         the JDOA and for no other purpose.

9.3      Each Party shall disclose  Confidential  Information of the other Party
         only to those employees, representatives and agents requiring knowledge
         thereof in connection  with  fulfilling the Party's  obligations  under
         this Agreement. Each Party further agrees to inform all such employees,
         representatives  and  agents  of  the  terms  and  provisions  of  this
         Agreement  and their duties  hereunder  and to obtain  their  agreement
         hereto as a condition of receiving Confidential Information. Each Party
         shall exercise the same standard of care as it would itself exercise in
         relation to its own confidential information (but in no event less than
         a reasonable  standard of care) to protect and preserve the proprietary
         and confidential nature of the Confidential Information disclosed to it
         by the other Party.  Each Party shall, upon request of the other Party,
         return all documents  and any copies  thereof  containing  Confidential
         Information belonging to, or disclosed by, such other Party.

9.4      Any  breach  of this  Clause  9 by any  person  informed  by one of the
         Parties is considered a breach by the Party itself.

9.5      Confidential Information shall not be deemed to include:

         9.5.1    information that is in the public domain;

         9.5.2    information  which is made  public  through  no breach of this
                  Agreement;


                                       20
<PAGE>


         9.5.3    information  which is  independently  developed  by a Party as
                  evidenced by such Party's records;

         9.5.4    information   that   becomes   available   to  a  Party  on  a
                  non-confidential basis, whether directly or indirectly, from a
                  source  other than a Party,  which source did not acquire this
                  information on a confidential basis; or

         9.5.5    information  which the receiving Party is required to disclose
                  pursuant to:

                  (i)    a valid order of a court or other governmental body; or

                  (ii)   any other requirement of law;

                  provided that if the receiving Party becomes legally  required
                  to disclose any Confidential Information,  the receiving Party
                  shall give the disclosing  Party prompt notice of such fact so
                  that the  disclosing  Party may obtain a  protective  order or
                  other appropriate  remedy concerning any such disclosure.  The
                  receiving  Party shall fully  co-operate  with the  disclosing
                  Party in connection  with the  disclosing  Party's  efforts to
                  obtain  any such order or other  remedy.  If any such order or
                  other remedy does not fully preclude disclosure, the receiving
                  Party shall make such  disclosure only to the extent that such
                  disclosure is legally required.

9.6      The  provisions  relating  to  confidentiality  in this  Clause 9 shall
         remain in effect during the term of this Agreement, and for a period of
         7  years  following  the  expiration  or  earlier  termination  of this
         Agreement.

9.7      The Parties agree that the  obligations  of this Clause 9 are necessary
         and reasonable in order to protect the Parties' respective  businesses,
         and each Party agrees that  monetary  damages  would be  inadequate  to
         compensate  a Party for any breach by the other Party of its  covenants
         and agreements set forth herein.

         Accordingly,  the Parties  agree that any such  violation or threatened
         violation  shall  cause  irreparable  injury to a Party  and  that,  in
         addition to any other remedies that may be available, in law and equity
         or otherwise,  each Party shall be entitled to obtain injunctive relief
         against the threatened  breach of the provisions of this Clause 9, or a
         continuation   of  any  such  breach  by  the  other  Party,   specific
         performance and other equitable  relief to redress such breach together
         with its damages and  reasonable  counsel  fees and expenses to enforce
         its rights  hereunder,  without  the  necessity  of  proving  actual or
         express damages.

10       GOVERNING LAW AND JURISDICTION

10.1     This  Agreement  shall be governed by and construed in accordance  with
         the laws of the State of New York.


                                       21
<PAGE>
10.2     The Parties will  attempt in good faith to resolve any dispute  arising
         out of or relating to this Agreement  promptly by  negotiation  between
         executives of the Parties.  In the event that such  negotiations do not
         result  in a  mutually  acceptable  resolution,  the  Parties  agree to
         consider other dispute resolution mechanisms including mediation.

         In the event that the  Parties  fail to agree on a mutually  acceptable
         dispute resolution mechanism, any such dispute shall be finally settled
         by the  courts of  competent  jurisdiction.  For the  purposes  of this
         Agreement the parties submit to the  non-exclusive  jurisdiction of the
         courts of the State of New York.


11       IMPOSSIBILITY OF PERFORMANCE - FORCE MAJEURE

         Neither   Sheffield  nor  Newco  shall  be  liable  for  delay  in  the
         performance of any of its  obligations  hereunder if such delay results
         from  causes  beyond  its  reasonable   control,   including,   without
         limitation, acts of God, fires, strikes, acts of war, intervention of a
         government  authority,  but any such delay or failure shall be remedied
         by such Party as soon as practicable.

12       ASSIGNMENT

         This  Agreement  may not be assigned by either Party  without the prior
         written  consent of the other,  save that either  Party may assign this
         Agreement to its Affiliates or subsidiaries  without such prior written
         consent  provided  that such  assignment  does not have any adverse tax
         consequences on the other Party.


13       NOTICES

13.1     Any notice to be given under this Agreement shall be sent in writing in
         English by registered airmail or telefaxed to the following addresses:

         If to Newco at:

         102 St. James Court
         Flatts,
         Smiths FL04
         Bermuda
         Attention:  Secretary
         Telephone:  441 292 9169
         Fax:        441 292 2224

         with a copy to Elan and Sheffield at the addresses listed below:

                                       22
<PAGE>

         If to Sheffield at:
         Sheffield Pharmaceuticals, Inc.
         425 S. Woodsmill Road
         Suite 270
         St Louis
         MO 63017

         USA.

         Attn: Chief Executive Officer
         Telephone  001 314 579 9899
         Fax:       001 314 579 9799

         with a copy to:

         Daniel Gallagher, Esq.
         Olshan, Grundman, Trome
         Rosenzeig, LLP
         505 Park Avenue
         New York, NY 10022

         Telephone   002 212 753 7200
         Fax:        001 212 935 1787

         If to Elan at:

         Elan Corporation, plc
         Lincoln House,
         Lincoln Place,
         Dublin 2,
         Ireland.

         Attention: Vice President, General Counsel,
         Elan Pharmaceutical Technologies,
         a division of Elan Corporation, plc
         Telephone:  + 353 1 709 4000
         Telefax:      + 353 1 709 4124

         or to such other  address(es)  and telefax  numbers as may from time to
         time be notified by either Party to the other hereunder.

13.2     Any notice sent by mail shall be deemed to have been  delivered  within
         seven 7 working  days after  dispatch  and any notice  sent by telex or
         telefax shall be deemed to have been  delivered  within twenty 24 hours
         of the time of the  dispatch.  Notice  of change  of  address  shall be
         effective upon receipt.

                                       23
<PAGE>
14       MISCELLANEOUS

14.1     Waiver:

         No waiver of any right under this Agreement  shall be deemed  effective
         unless contained in a written document signed by the Party charged with
         such waiver, and no waiver of any breach or failure to perform shall be
         deemed to be a waiver of any other  breach or  failure to perform or of
         any other right arising under this Agreement.

14.2     Severability:

         If any  provision in this  Agreement is agreed by the Parties to be, or
         is deemed to be, or becomes  invalid,  illegal,  void or  unenforceable
         under any law that is applicable hereto:

         14.2.1   such provision will be deemed amended to conform to applicable
                  laws so as to be valid and enforceable; or

         14.2.2   if it cannot be so amended  without  materially  altering  the
                  intention of the Parties, it will be deleted, with effect from
                  the date the Parties may agree, and the validity, legality and
                  enforceability  of the remaining  provisions of this Agreement
                  shall not be impaired or affected in any way.

14.3     Further Assurances:

         At the request of any of the Parties,  the other Party or Parties shall
         (and shall use reasonable  efforts to procure that any other  necessary
         parties shall) execute and perform all such documents,  acts and things
         as may  reasonably  be  required  subsequent  to the  signing  of  this
         Agreement for assuring to or vesting in the  requesting  Party the full
         benefit of the terms hereof.

14.4     Successors:

         This  Agreement  shall be binding  upon and enure to the benefit of the
         Parties hereto, their successors and permitted assigns.

14.5     No Effect on Other Agreements/Conflict:

         No  provision  of this  Agreement  shall be  construed so as to negate,
         modify  or  affect in any way the  provisions  of any  other  agreement
         between the Parties unless specifically  referred to, and solely to the
         extent provided herein.

         In the event of a conflict between the provisions of this Agreement and
         the  provisions of the JDOA, the terms of the JDOA shall prevail unless
         this Agreement specifically provides otherwise.


                                       24
<PAGE>

14.6     Amendments:

         No  amendment,  modification  or addition  hereto shall be effective or
         binding on any Party unless set forth in writing and executed by a duly
         authorised representative of each Party.

14.7     Counterparts:

         This Agreement may be executed in any number of  counterparts,  each of
         which when so  executed  shall be deemed to be an  original  and all of
         which when taken together shall constitute this Agreement.

14.8     Good Faith:

         Each  Party  undertakes  to do all things  reasonably  within its power
         which are  necessary  or  desirable  to give  effect to the  spirit and
         intent of this Agreement.

14.9     No Reliance:

         Each Party hereby  acknowledges that in entering into this Agreement it
         has not relied on any  representation or warranty save as expressly set
         out herein or in any document referred to herein.

14.10    Relationship of the Parties:

         Nothing  contained in this  Agreement is intended or is to be construed
         to  constitute  Sheffield  and Newco as  partners,  or  Sheffield as an
         employee of Newco, or Newco as an employee of Sheffield.

         Neither  Party  hereto  shall  have any  express  or  implied  right or
         authority  to assume or create any  obligations  on behalf of or in the
         name of the  other  Party or to bind the other  Party to any  contract,
         agreement or undertaking with any third party.




                                       25
<PAGE>
                                   SCHEDULE 1

                     TECHNOLOGICAL COMPETITIORS OF SHEFFIELD


[REDACTED]





<PAGE>
                                   SCHEDULE 2

                         List of Steroids for Clause 4.1




[REDACTED]





<PAGE>

IN WITNESS WHEREOF the Parties hereto have executed this Agreement.




/s/
SIGNED BY
for and on behalf of
SHEFFIELD PHARMACEUTICALS, INC.





/s/
SIGNED BY
For and on behalf of
SHEFFIELD NEWCO LIMITED




/s/
AGREED TO AND ACCEPTED BY
ELAN PHARMA INTERNATIONAL LIMITED












                                LICENSE AGREEMENT


                                     BETWEEN


                        ELAN PHARMA INTERNATIONAL LIMITED


                                       AND


                             SHEFFIELD NEWCO LIMITED








<PAGE>
                                TABLE OF CONTENTS



1.    DEFINITIONS
2.    ELAN LICENSE TO NEWCO
3.    INTELLECTUAL PROPERTY
4.    NON-COMPETITION/AFTER ACQUIRED TECHNOLOGY
5.    FINANCIAL PROVISIONS
6.    RIGHT OF INSPECTION AND AUDIT
7.    REPRESENTATIONS AND WARRANTIES
8.    TERM AND TERMINATION
9.    CONFIDENTIAL INFORMATION
10.   GOVERNING LAW AND JURISDICTION
11.   IMPOSSIBILITY OF PERFORMANCE - FORCE MAJEURE
12.   ASSIGNMENT
13.   NOTICES
14.   MISCELLANEOUS




<PAGE>

THIS AGREEMENT made this 20 October 1999

between:

(1)      Elan  Pharma  International  Limited  incorporated  under  the  laws of
         Ireland,  and  having  its  registered  office  at WIL  House,  Shannon
         Business Park, Shannon, County Clare, Ireland ("EPIL");

(2)      Newco Limited, a private limited company incorporated under the laws of
         Bermuda and having its registered  office at Clarendon  House, 2 Church
         Street, Hamilton, Bermuda ("Newco"); and

(3)      Sheffield  Pharmaceuticals,  Inc., a corporation duly  incorporated and
         validly  existing  under the laws of Delaware and having its  principal
         place of business at 425 S. Woodsmill  Road,  Suite 270, St. Louis,  MO
         63017, USA("Sheffield").


RECITALS:

A.       Simultaneously herewith,  Sheffield,  Elan, EIS, and Newco are entering
         into the JDOA for the purpose of recording the terms and  conditions of
         the joint venture and of regulating their  relationship with each other
         and certain aspects of the affairs of, and their dealings with Newco.

B.       Newco  desires to enter into this  Agreement  with Elan so as to permit
         Newco to utilize the Elan Intellectual Property in making, having made,
         importing, using, offering for sale and selling the Products in Field A
         and Field B and  Formulations in Field C in the Territory in accordance
         with the terms of this Agreement.

C.       Simultaneously  herewith  Newco and  Sheffield  are  entering  into the
         Sheffield  License  Agreement  relating to Newco's use of the Sheffield
         Intellectual Property.


1        DEFINITIONS

1.1      In this Agreement unless the context otherwise requires:

         "Affiliate"   shall  mean  any   corporation  or  entity   controlling,
         controlled  or under the common  control of Elan or  Sheffield,  as the
         case  may be,  excluding  Systemic  Pulmonary  Delivery  Ltd..  For the
         purpose of this  definition,  "control"  shall mean  direct or indirect
         ownership  of  fifty  percent  (50%)  or more of the  stock  or  shares
         entitled  to vote  for  the  election  of  directors.  Newco  is not an
         Affiliate of Sheffield.

         "Agreement"  shall mean this license  agreement (which expression shall
         be deemed to include the Recitals and Schedules hereto).
                                       3

<PAGE>

         "Business Plan" shall have the meaning,  as such term is defined in the
         JDOA.

         "Change of Control of Sheffield/Newco" shall mean circumstances where:

         (i)      a  Technological   Competitor  of  Elan  shall,   directly  or
                  indirectly,  acquire [REDACTED] or more of the voting stock of
                  Sheffield or Newco,  or otherwise  control or influence in any
                  material  respect  their  management  or business or otherwise
                  have entered into any joint venture, collaboration, license or
                  other arrangement with Sheffield or Newco, as the case may be,
                  to such an extent that such a Technological Competitor of Elan
                  is  materially  engaged  or  involved  with  the  business  or
                  development of Sheffield or Newco, as the case may be; or

         (ii)     any  person  other  than a  Technological  Competitor  of Elan
                  shall,  directly or indirectly,  acquire [REDACTED] or more of
                  the then voting  stock of  Sheffield  or Newco,  or  otherwise
                  merge,  consolidate or enter into any similar  transaction (or
                  binding agreement in respect thereof) with Sheffield or Newco.

         "Combined Fields" shall mean Field A, Field B and Field C.

         "Compounds"  shall  mean the Field A  Compound,  the  Field B  Compound
         and/or the Field C Compound.

         "Confidential  Information"  shall  have the  meaning,  as such term is
         defined in Clause 9.

         "Definitive Documents" shall mean the definitive agreements relating to
         the transaction including finance, stock purchase, research and license
         agreements.

         "Elan"  shall  mean  EPIL  and  Affiliates  and  subsidiaries  of  Elan
         Corporation,  Plc.  within  the  division  of  Elan  Corporation,  Plc.
         carrying on business as Elan Pharmaceutical  Technologies but shall not
         include  Affiliates  and  subsidiaries  (present  or  future)  of  Elan
         Corporation Plc within the division of Elan  Corporation,  Plc carrying
         on business as Elan  Pharmaceuticals  which  incorporates,  inter alia,
         Targon Corporation,  Athena Neurosciences,  Inc., Elan Pharmaceuticals,
         Inc., Elan Diagnostics, Carnrick Laboratories, and Elan Europe Limited.

         "EIS"  shall  mean  Elan  International  Services,  Limited,  a private
         limited company  incorporated  under the laws of Bermuda and having its
         registered  office  at  Clarendon  House,  2 Church  Street,  Hamilton,
         Bermuda.

         "Effective Date" shall mean the date of this Agreement.

         "Elan  Intellectual  Property"  shall mean the Elan Know-How,  the Elan
         Patents and the Elan Improvements.

         For the avoidance of doubt,  Elan  Intellectual  Property shall exclude
         (i) Elan's  patent  rights and know-how  relating to protein or peptide
         agents or peptodomimetics,  derivatives or analogs thereof, designed to
                                       4

<PAGE>

         target a  pharmaceutically  active  agent to a certain site or sites in
         the body  (targeting  technology)  and  (ii)  inventions,  patents  and
         know-how  owned,  licensed or controlled by Axogen Limited and Neuralab
         Limited, and by all Affiliates and subsidiaries  (present or future) of
         Elan  Corporation,  Plc.  carrying on business as Elan  Pharmaceuticals
         which   incorporates,    inter   alia,   Targon   Corporation,   Athena
         Neurosciences,  Inc., Elan  Pharmaceuticals,  Inc.,  Elan  Diagnostics,
         Carnrick Laboratories, and Elan Europe Limited.

         "Elan  Know-How"  shall  mean any and all  rights  owned,  licensed  or
         controlled by Elan to any discovery,  invention (whether  patentable or
         not),  know-how,  substances,  data,  techniques,  processes,  systems,
         formulations and designs relating to Nanocrystal(TM) Technology.

         "Elan Licenses" shall have the meaning set forth in Clause 2.1.

         "Elan  Patents" shall mean any and all rights under any and all patents
         applications  and/or  patents,  now  existing,   currently  pending  or
         hereafter  filed  or  obtained  by  Elan  relating  to  Nanocrystal(TM)
         Technology  as set forth in Schedule  1, and any  foreign  counterparts
         thereof and all divisionals, continuations,  continuations-in-part, any
         foreign  counterparts  thereof and all  patents  issuing on, any of the
         foregoing, together with all registrations,  reissues,  re-examinations
         or extensions thereof.

         "EPIL Patents" shall mean the Elan Patents owned by EPIL.

         "Elan  Improvements"  shall  mean  improvements  relating  to the  Elan
         Patents and/or the Elan Know-How,  developed (i) by Elan whether or not
         pursuant to the Project, (ii) by Newco or Sheffield or by a third party
         (under  contract  with Newco)  whether or not  pursuant to the Project,
         and/or (iii)  jointly by any  combination  of Elan,  Sheffield or Newco
         pursuant to the  Project,  except as limited by  agreements  with third
         Parties.

         Subject to third party agreements,  Elan Improvements  shall constitute
         part of Elan  Intellectual  Property  and be included in the license of
         the Elan  Intellectual  Property  pursuant to Clause 2.1 solely for the
         purposes set forth therein.  If the inclusion of an Elan Improvement in
         the license of Elan Intellectual Property is restricted or limited by a
         third party agreement,  Elan shall use reasonable commercial efforts to
         minimize any such restriction or limitation.

         "Elan Trademark(s)" shall mean one or more trademarks,  trade names, or
         service  marks that are owned or licensed by or on behalf of Elan which
         Elan may  nominate  and approve in writing from time to time for use in
         connection with the sale or promotion of the Products by Newco.

         "Field A" shall mean the topical pulmonary  delivery of Formulations of
         the Field A Compound by means of the Field A Device.

         "Field B" shall mean the topical  pulmonary  delivery of a Formulations
         of the Field B Compound by means of the Field B Device.

                                       5
<PAGE>
         "Field C" shall mean the topical  pulmonary  delivery of a Formulations
         of the Field C Compound by means of the Field C Device.

         "Field A Device" shall mean a third party table top unit dose nebulizer
         having a  reservoir  capable  of  holding a unit dose (a device and the
         compressor to nebulize a unit dose shall be deemed a device),  which is
         a device having any one the following characteristics:

         (i)      [REDACTED]

         (ii)     [REDACTED]

         (iii)    [REDACTED]

         (iv)     [REDACTED]

         (v)      [REDACTED]

         For the  avoidance  of  doubt,  the  Field A Device  does  not  include
         [REDACTED]

         "Field B Device" shall mean the Aerosol Drug Delivery System  ("ADDS"),
         owned by Systemic Pulmonary  Delivery Limited and exclusively  licensed
         to Sheffield for topical pulmonary applications.

         "Field C Device" shall mean the handheld  multi-dose  nebulizer ("MSI")
         which was licensed  exclusively by Siemens to Sheffield pursuant to the
         Siemens Agreements and which was subsequently sub-licensed by Sheffield
         to Zambon (on an exclusive basis for delivery of various  medicines for
         humans in  treating  respiratory  disease  and/or  other lung  diseases
         including,  but not limited to,  anti-infectives)  provided that Newco,
         through  the  Management  Committee,   is  successful  in  obtaining  a
         sub-license  from Zambon to Newco enabling the development of the Field
         C Compound for use with the Field C Device, as described in more detail
         in Clause 2.2.

         "Field A Compound" shall mean [REDACTED]

         "Field B Compound"  shall mean  [REDACTED]  for  therapeutic  use to be
         nominated  by the  Management  Committee  pursuant to the JDOA and with
         reference to the JDOA, any Substitute Field B Compound.

         "Field C Compound"  shall mean  [REDACTED]  and with  reference  to the
         JDOA, any  Substitute  Field C Compound  and/or any Additional  Field C
         Compound.

         "Financial  Year" shall mean each year  commencing  on 1 January (or in
         the case of the first  Financial Year, the Effective Date) and expiring
         on 31 December of each year.

         "Formulations"  shall mean Nanocrystal(TM)  Technology  formulations of
         Compounds for use in Field A, Field B or Field C, as applicable.

                                       6
<PAGE>

         "JDOA"  shall  mean  that  certain  joint   development  and  operating
         agreement,  of even date herewith, by and between Elan, Sheffield,  EIS
         and Newco.

         "Licensed  Technologies" shall mean the Elan Intellectual  Property and
         the Sheffield Intellectual Property.

         "Licenses" shall mean the Elan License and the Sheffield License.

         "Management  Committee" shall have the meaning, as such term is defined
         in the JDOA.

         "Nanocrystal(TM) Technology" shall mean the Elan proprietary technology
         directed  to  nanoparticulate  formulations  of  compounds  used in the
         manufacturing  and/or  formulation  process,  and methods of making the
         same.

         "Newco  Intellectual  Property"  shall  mean  all  rights  to  patents,
         know-how and other intellectual  property arising out of the conduct of
         the Project by any person,  including any technology  acquired by Newco
         from a third party, that does not constitute Elan Intellectual Property
         or Sheffield Intellectual Property.

         "Newco Patents" shall mean any and all patents now existing,  currently
         pending  or  hereafter   filed  or  obtained   relating  to  the  Newco
         Intellectual  Property,  and any foreign  counterparts  thereof and all
         divisionals,   continuations,    continuations-in-part,   any   foreign
         counterparts  thereof and all patents issuing on, any of the foregoing,
         together  with  all   registrations,   reissues,   re-examinations   or
         extensions thereof.

         "Party"  shall mean Elan or Newco,  as the case may be,  and  "Parties"
         shall mean Elan and Newco.

         "Products" shall mean the Field A Products, the Field B Products and/or
         the Field C Products, as follows:

         "Field A  Products"  shall  mean  Formulations  of the Field A Compound
         delivered by means of any Field A Device in Field A.

         "Field B  Products"  shall  mean  Formulations  of the Field B Compound
         delivered by means of the Field B Device in Field B.

         "Field C  Products"  shall  mean  Formulations  of the Field C Compound
         delivered by means of the Field C Device in Field C.

         "Project"  shall mean all  activities as undertaken by Elan,  Sheffield
         and Newco in order to develop the Products.

         "R&D Committee" shall have the meaning,  as such term is defined in the
         JDOA.

                                       7
<PAGE>
         "R&D Plan" shall have the meaning, as such term is defined in the JDOA.

         "R&D Program" shall mean any research and development program commenced
         by Newco pursuant to the Project.

         "Sheffield"   shall  mean  Sheffield   Pharmaceuticals,   Inc  and  its
         Affiliates, excluding Newco.

         "Sheffield  Intellectual  Property" shall mean the Sheffield  Know-How,
         the Sheffield Patents and the Sheffield Improvements, as such terms are
         defined in the Sheffield License Agreement.

         "Sheffield  License"  shall have the meaning set forth in Clause 2.1 of
         the Sheffield License Agreement.

         "Sheffield   License   Agreement"   shall  mean  that  certain  license
         agreement,  of even date herewith,  entered into between  Sheffield and
         Newco.

         "Sheffield  Patents"  shall have the meaning as such term is defined in
         the Sheffield License Agreement.

         "Sheffield Improvements" shall have the meaning as such term is defined
         in the Sheffield License Agreement.

         "Siemens" shall mean Siemens Aktiengesellschaft.

         "Siemens  Agreements"  shall mean the License  Agreement dated 21 March
         1997 and the Basic Supply  Agreement  dated 21 March 1997, both between
         Sheffield Medical Technologies Inc. and Siemens Aktiengesellschaft.

         "Technological Competitor of Elan" shall mean a company, corporation or
         person listed in Schedule 2 and  successors  thereof or any  additional
         broad-based  technological  competitor  of Elan added to such  Schedule
         from time to time upon mutual agreement of the Parties.

         "Term" shall have the meaning set forth in Clause 8.

         "Territory" shall mean all the countries of the world.

         "United States Dollar" and "US$" shall mean the lawful currency for the
         time being of the United States of America.

         "Zambon" shall mean Inpharzam International, S.A.

                                       8
<PAGE>
1.2      In this Agreement:

         1.2.1   The  singular  includes  the  plural  and vice  versa,  and the
                 masculine  includes  the feminine and vice versa and the neuter
                 includes the masculine and the feminine.

         1.2.2   Any reference to a Clause or Schedule shall,  unless  otherwise
                 specifically  provided,  be to a  Clause  or  Schedule  of this
                 Agreement.

         1.2.3   The headings of this  Agreement are for ease of reference  only
                 and shall not affect its construction or interpretation.


2.       ELAN LICENSE TO NEWCO

2.1.     Elan hereby grants to Newco for the Term the following licenses subject
         to any contractual  obligations that Elan has as of the Effective Date,
         including  but  not  limited  to [REDACTED]

         2.1.1    an exclusive license (including the right to grant sublicenses
                  subject  to  the  limitations  of  Clause  2.7)  of  the  Elan
                  Intellectual  Property solely to make, have made, import, use,
                  offer for sale and sell the Field A Products in the  Territory
                  in Field A;

         2.1.2    a  non-exclusive   license   (including  the  right  to  grant
                  sublicenses  subject to the  limitations of Clause 2.7) of the
                  Elan Intellectual  Property solely to make, have made, import,
                  use,  offer  for sale and sell  the  Field B  Products  in the
                  Territory in Field B;

         2.1.3    subject  to the  execution  by Newco of a written  sub-license
                  with  Zambon as more  fully  described  in Clause  2.2 for the
                  development by Newco of the Field C Formulations in accordance
                  with Clause 2.2, a non-exclusive  license (including the right
                  to grant sublicenses subject to the limitations of Clause 2.7)
                  of the Elan  Intellectual  Property solely to make, have made,
                  import,  use, offer for sale and sell the Field C Formulations
                  in the Territory in Field C;

         (the "Elan Licenses").

2.2      On the date which is [REDACTED]  days following the Effective  Date, or
         such extended date as may be agreed in writing by Elan and Newco,  Elan
         shall, at its sole discretion,  be entitled  forthwith to terminate the
         license to Newco  described in Clause 2.1.3,  upon notice in writing to
         Newco, in the event that Newco has not, prior to such date,  executed a
         written  sub-license  with Zambon for the  development  by Newco of the
         Field C Formulations in Field C.

         Such  written  sub-license  will  be  subject  to the  approval  of the
         Management Committee and will include authority from Zambon to Newco to
                                       9

<PAGE>

         the extent necessary for Newco to develop,  make, have made and use the
         Field  C  Formulations  in  the  Territory,  general  financial  terms,
         development schedule,  and terms governing the funding by Zambon of any
         R&D Program(s) in Field C, together with such other substantive  issues
         as the Management Committee shall deem appropriate and customary terms.

         For the avoidance of doubt, to the extent royalty or other compensation
         obligations  are  payable  to  Zambon  in  respect  of any  license  or
         sub-license  from  Zambon  to Newco  of  intellectual  property  rights
         necessary  for  Newco  to  develop,   make,   have  made  the  Field  C
         Formulations in the Territory,  Sheffield shall be responsible for same
         and shall  indemnify  Newco in  respect  of any such  royalty  or other
         compensation obligations payable to Zambon.

2.3      Elan  shall  be  responsible  for  payments  related  to the  financial
         provisions and obligations of any third party agreement with respect to
         the Elan Intellectual  Property to which it is a party on the Effective
         Date   (including   amendments   thereto)  (the  "Elan  Effective  Date
         Agreements"),  including  without  limitation,  any  royalty  or  other
         compensation obligations triggered thereunder on the Effective Date, or
         triggered thereunder after the Effective Date.

         For the avoidance of doubt,  royalties,  milestones  or other  payments
         which arise from the process of the  commercialization  or exploitation
         of products under the Elan Effective Date  Agreements  (for example,  a
         milestone  payment  payable  upon  successful  completion  of  Phase II
         clinical  trials,  the  filing  of an NDA  application,  obtaining  NDA
         approval,  or first  commercial  sale) shall be payments for which Elan
         will be responsible under this Clause 2.1.

2.4      To the  extent  royalty  or  other  compensation  obligations  that are
         payable to third parties with respect to the Elan Intellectual Property
         would be  triggered  after the  Effective  Date  under any third  party
         agreement  entered  into by Elan  after the  Effective  Date (the "Elan
         Post-Effective  Date  Agreements"),  by a  proposed  use of  such  Elan
         Intellectual  Property in connection with the Project, Elan will inform
         Newco of such royalty or compensation  obligations.  If Newco agrees to
         utilise such Elan Intellectual Property in connection with the Project,
         Newco will be  responsible  for the  payment  of such  royalty or other
         compensation obligations relating thereto.

         For the avoidance of doubt,  royalties,  milestones  or other  payments
         which arise from the process of the  commercialization  or exploitation
         of products under the Elan Post-Effective Date Agreements (for example,
         a milestone  payment  payable upon  successful  completion  of Phase II
         clinical  trials,  the  filing  of an NDA  application,  obtaining  NDA
         approval,  or first  commercial sale) shall be payments for which Newco
         will be responsible under this Clause 2.2.

2.5      Sheffield shall be a third party  beneficiary  under this Agreement and
         shall have the right to cause  Newco to enforce  Newco's  rights  under
         this Agreement against Elan.

2.6      Notwithstanding  anything  contained in this Agreement to the contrary,
         Elan shall have the right  outside the Field A, Field B and Field C and
                                       10

<PAGE>

         subject to the  non-competition  provisions  of Clause 4 to exploit and
         grant licenses and sublicenses of the Elan Intellectual Property.

         For the  avoidance of doubt,  Newco shall have no right to use the Elan
         Intellectual Property outside Field A, Field B or Field C.

2.7      Newco shall not be permitted to assign or sublicense  any of its rights
         under the Elan Intellectual  Property without the prior written consent
         of Elan,  which consent shall not be  unreasonably  withheld or delayed
         provided  that Elan  shall in all  cases,  in its sole  discretion,  be
         entitled to withhold  its consent in the case of a proposed  sublicense
         to any Technological Competitor to Elan.

2.8      Any  agreement  between  Newco and any  permitted  third  party for the
         development or  exploitation  of the Elan  Intellectual  Property shall
         require  such  third  party  to  maintain  the  confidentiality  of all
         information concerning the Elan Intellectual Property.

         Insofar as the obligations  owed by Newco to Elan are concerned,  Newco
         shall remain  responsible  for all acts and  omissions of any permitted
         sub-licensee,  including Sheffield,  as if they were acts and omissions
         by Newco.


3        INTELLECTUAL PROPERTY

3.1      Ownership of Intellectual Property:

         3.1.1     Newco shall own the Newco Intellectual Property.

         3.1.2     Elan shall own the Elan Intellectual Property.

3.2      Trademarks:

         3.2.1     Elan  hereby  grants to Newco  for the Term a  non-exclusive,
                   royalty free license in the  Territory to use and display the
                   Elan  Trademarks  to  promote,  offer  for  sale and sell the
                   Products in Field A, Field B and the  Formulations in Field C
                   in the Territory and the following  provisions shall apply as
                   regards the use of the Elan Trademarks by Newco hereunder:

                   (1)   Newco shall ensure that each reference to and use of an
                         Elan Trademark by Newco is in a manner approved by Elan
                         and  accompanied  by  an  acknowledgement,  in  a  form
                         approved  by Elan,  that the  same is a  trademark  (or
                         registered trademark) of Elan.

                         From time to time, upon the reasonable request of Elan,
                         Newco  shall  submit  samples of the Product to Elan or
                         its duly  appointed  agent to  ensure  compliance  with
                         quality standards and specifications. Elan, or its duly
                         appointed  agent,  shall have the right to inspect  the
                         premises of Newco where the Products are  manufactured,
                         held or stored, and Newco shall permit such inspection,

                                       11
<PAGE>

                         upon  advance  notice at any  reasonable  time,  of the
                         methods and procedures used in the manufacture, storage
                         and  sale  of the  Product.  Newco  shall  not  sell or
                         otherwise   dispose  of  any  Product  under  the  Elan
                         Trademarks  that  fails  to  comply  with  the  quality
                         standards and specifications referred to in this Clause
                         3.2, as determined by Elan.

                   (2)   Newco shall not use an Elan  Trademark in any way which
                         might  materially   prejudice  its  distinctiveness  or
                         validity or the goodwill of Elan therein.

                   (3)   The parties  recognize  that the Elan  Trademarks  have
                         considerable goodwill associated therewith. Newco shall
                         not use in  relation  to the  Products  any  trademarks
                         other than the Elan  Trademarks  (except the  Sheffield
                         Trademarks   (as  defined  in  the  Sheffield   License
                         Agreement)   licensed  to  Newco  under  the  Sheffield
                         License  Agreement) without obtaining the prior consent
                         in  writing  of  Elan,   which   consent   may  not  be
                         unreasonably  withheld.  However,  such  use  must  not
                         conflict with the use and display of the Elan Trademark
                         and such use and display must be approved by Elan.

                   (4)   Newco shall not use in the Territory any  trademarks or
                         trade names so resembling  the Elan  Trademark as to be
                         likely to cause confusion or deception.

                   (5)   Newco  shall  promptly  notify  Elan in  writing of any
                         alleged  infringement or  unauthorised  use of which it
                         becomes  aware by a third party of the Elan  Trademarks
                         and  provide  Elan  with  any  applicable  evidence  of
                         infringement or unauthorised use.

                   (6)   Newco shall not be  permitted  to assign or  sublicense
                         any of its rights under the Elan Trademarks without the
                         prior written consent of Elan,  which consent shall not
                         be unreasonably withheld or delayed.

         3.2.2     Elan  shall,  at its expense  and sole  discretion,  file and
                   prosecute applications to register and maintain registrations
                   of  the  Elan  Trademarks  in  the  Territory.   Newco  shall
                   reasonably co-operate with Elan in such efforts. In the event
                   Elan  decides not to file or prosecute  such Elan  Trademark,
                   Newco may request Elan to do the same at Newco's expense, and
                   Elan shall file or prosecute  such Elan  Trademark at Newco's
                   request  and  expense  unless  Elan  believes  such action is
                   without merit.

         3.2.3     Elan will be entitled to conduct all enforcement  proceedings
                   relating  to the  Elan  Trademarks  and  shall  at  its  sole
                   discretion  decide what action, if any, to take in respect to
                   any  enforcement  proceedings  of the Elan  Trademarks or any
                   other claim or counter-claim brought in respect to the use or
                   registration  of the Elan  Trademarks.  Any such  proceedings
                   shall be conducted at Elan's expense and for its own benefit.
                   Newco and Sheffield shall  reasonably  cooperate with Elan in

                                       12

<PAGE>

                   such  efforts.  In the event  Elan  decides  not to engage in
                   enforcement  proceedings  of the Elan  Trademarks,  Newco may
                   request  Elan to do the same at Newco's  expense  unless Elan
                   believes  the  basis  for  such  enforcement  proceedings  is
                   without  merit.  In such a case,  Elan  shall  have  the sole
                   discretion not to engage in any such enforcement proceedings

         3.2.4     Save where Newco adopts its own mark under Clause  3.2.4,  in
                   the event Newco  becomes  aware that any Elan  Trademark  has
                   been   challenged   by  a  third   party  in  a  judicial  or
                   administrative  proceeding  in a country in the  Territory as
                   infringing  on  the  rights  of a  third  party  Newco  shall
                   promptly notify Elan in writing and Elan shall have the first
                   right to decide whether or not to defend such allegations, or
                   to  adopt an  alternative  mark,  or allow  Newco to adopt an
                   alternative  mark.  If  Elan  decides  not  defend  the  Elan
                   Trademark,  then  Newco may  request  Elan to defend the Elan
                   Trademark,  at Newco's expense, unless such requested defense
                   is  reasonably  believed  by Elan to be  unsubstantiated  and
                   without merit. In such a case, Elan may elect not to initiate
                   defence proceedings.

         3.2.5     Newco  will have no  ownership  rights in respect of the Elan
                   Trademarks or of the goodwill associated therewith, and Newco
                   hereby  acknowledges  that,  except as expressly  provided in
                   this  Agreement,  it shall not  acquire any rights in respect
                   thereof and that all such rights and  goodwill  are, and will
                   remain, vested in Elan.

         3.2.6     Nothing in this Agreement shall be construed as a warranty on
                   the part of Elan  regarding  the Elan  Trademarks,  including
                   without  limitation,  that use of the Elan  Trademarks in the
                   Territory  will not infringe the rights of any third parties.
                   Accordingly, Newco acknowledges and agrees that Elan makes no
                   such warranty.

         3.2.7     Elan assumes no  liability  to Newco or to any third  parties
                   with respect to the quality,  performance or  characteristics
                   of any of the goods  manufactured  or sold by Newco under the
                   Elan Trademarks pursuant to this Agreement.


4        NON-COMPETITION/AFTER ACQUIRED TECHNOLOGY

4.1      Subject to Clause 4.2 and Clause 4.3 and Clause 8.6,  during the period
         during  which  the  license  described  in  Clause  2.1.1  has not been
         terminated, Elan shall not, alone or in conjunction with a third party,
         develop  or  commercialize  any of the unit  dose  steroids  listed  in
         Schedule 3 for topical  pulmonary  delivery  using a Field A Device and
         utilizing the Nanocrystal(TM)Technology,  subject to written agreements
         between Elan and  unaffiliated  third  parties on the  Effective  Date,
         including  but  not  limited  to the  Development  License  and  Supply
         Agreement dated 26 July 1999 between EPIL and Merck Corporation.

         For the avoidance of doubt,  the  non-compete  obligation  set forth in
         this  Clause 4 shall  not  prevent  or  restrict  EPIL (as the owner of
         intellectual  property  related  to  Nanocrystal(TM)  Technology)  from
         entering  into any  agreement  with any  third  party  to  license  the
         Nanocrystal(TM)  Technology,  such license  being  limited to compounds

                                       13

<PAGE>

         owned,  acquired,  in-licensed  or otherwise  proprietary to such third
         party  but not  including  any of the  unit  dose  steroids  listed  in
         Schedule 3 for topical  pulmonary  delivery  using a Field A Device and
         utilizing the Nanocrystal(TM) Technology.

         The provisions of this Clause 4.1 shall only act as a restriction  upon
         Affiliates  and  subsidiaries  of Elan  Corporation,  Plc.  within  the
         division  of  Elan  Corporation,  Plc.  carrying  on  business  as Elan
         Pharmaceutical  Technologies  and shall not act as a restriction  upon,
         nor in any way affect,  Affiliates and subsidiaries (present or future)
         of Elan  Corporation Plc within the division of Elan  Corporation,  Plc
         carrying on business as Elan Pharmaceuticals which incorporates,  inter
         alia,   Targon   Corporation,   Athena   Neurosciences,    Inc.,   Elan
         Pharmaceuticals,  Inc., Elan Diagnostics,  Carnrick  Laboratories,  and
         Elan Europe Limited.

4.2      Notwithstanding  the  provisions  of Clause  4.1,  the  non-competition
         obligations  of Elan set forth in Clause  4.1 shall not  restrict  Elan
         from entering into an agreement  with  [REDACTED]  during the period of
         [REDACTED]  following the Effective  Date, or such longer period as may
         be  agreed by Elan and  Newco,  for the  development  of a unit dose of
         [REDACTED],  for topical pulmonary  delivery using a Field A Device and
         utilizing  the  Nanocrystal(TM)Technology   subject  to  the  following
         conditions:

         4.2.1   if such agreement is not executed by Elan and [REDACTED] within
                 the period of [REDACTED]  following the Effective Date, or such
                 longer  period  as  may be  agreed  by  Elan  and  Newco,  this
                 exception to the non-competition  obligations of Elan set forth
                 in  Clause  4.1  shall  expire  and be of no  further  force or
                 effect;

         4.2.2   if such agreement is agreed for execution by Elan and [REDATED]
                 within the period of [REDACTED]  following the Effective  Date,
                 or such longer period as may be agreed by Elan and Newco, Newco
                 and Sheffield shall forthwith sign an amendment to this License
                 Agreement  (and  any  of the  other  Definitive  Documents,  if
                 necessary) terminating the non-competition  obligations of Elan
                 set forth in Clause 4.1 insofar as such  obligations  relate to
                 [REDACTED]  and the  Parties  shall  agree in good faith and on
                 reasonable  commercial and customary  terms what portion of the
                 royalties  payable by  [REDACTED]  to Elan under the  agreement
                 proposed for execution should be payable to Newco in return for
                 such amendment to this License  Agreement (and any of the other
                 Definitive Documents, if necessary).

4.3      If, after the Effective Date,  Elan acquires  know-how or patent rights
         relating to the Field A, Field B or Field C, or acquires or merges with
         a third party entity that has know-how or patent rights relating to the
         Field A, Field B or Field C, Elan shall offer to license such  know-how
         and  patent   rights  to  Newco   (subject  to   existing   contractual
         obligations), on commercially reasonable terms on an arm's length basis
         for a reasonable period under the prevailing circumstances.

         If Newco  determines  that Newco should not acquire such license,  Elan
         shall be free to fully exploit such know-how and patent rights with the
         Elan  Intellectual  Property then licensed to Newco,  whether inside or
         outside the Field A, Field B or Field C, as applicable, and to grant to
         third parties licenses and sublicenses with respect thereto.

                                       14
<PAGE>

5        FINANCIAL PROVISIONS

5.1      License Fee:

         In  consideration  of the license by EPIL to Newco of the EPIL  Patents
         under Clause 2, Newco shall pay to EPIL a non-refundable license fee of
         [REDACTED] in cash (the "License Fee"),  the receipt of which is hereby
         acknowledged by EPIL.

         The License Fee shall not be subject to future performance  obligations
         of Elan to Newco or  Sheffield  and  shall  not be  applicable  against
         future services provided by Elan to Newco or Sheffield.

         For the  avoidance  of doubt,  in the event  that Elan  terminates  the
         license to Newco  described in Clause 2.1.3  pursuant to the provisions
         of Clause 2.2, no part of the License Fee  described in this Clause 5.1
         shall become refundable to Sheffield.

5.2      Royalties:

         Prior  to  the  commercialization  of  the  Products,   the  Management
         Committee  shall  consider  and if  appropriate,  determine  reasonable
         royalties  with  respect to the  commercialization  of the  Products by
         Newco that shall be payable by Newco to Elan and Sheffield,  and shared
         by Elan and Sheffield equally.

         At such  time,  the  Management  Committee  will  agree an  appropriate
         definition of "Net Sales" as such term is used in this Agreement.

5.3      Payment of any royalties pursuant to Clause 5.2 shall be made quarterly
         in arrears  during each  Financial Year within 30 days after the expiry
         of the  calendar  quarter.  The  method  of  payment  shall  be by wire
         transfer to an account  specified  by Elan.  Each  payment made to Elan
         shall be  accompanied  by a true  accounting  of all  Products  sold by
         Newco's permitted sublicensees, if any, during such quarter.

         Such   accounting   shall   show,   on   a    country-by-country    and
         Product-by-Product  basis, Net Sales (and the calculation  thereof) and
         each  calculation  of royalties  with respect  thereto,  including  the
         calculation of all adjustments and currency conversions.

5.4      Newco shall maintain and keep clear, detailed,  complete,  accurate and
         separate records for a period of 3 years:

         5.4.1   to enable any  royalties  on Net Sales that shall have  accrued
                 hereunder to be determined; and

         5.4.2   to enable any deductions  made in the Net Sales  calculation to
                 be determined.

                                       15
<PAGE>

5.5      All  payments due  hereunder  shall be made in United  States  Dollars.
         Payments due on Net Sales of any Product for each calendar quarter made
         in  a  currency  other  than  United  States  Dollars  shall  first  be
         calculated in the foreign  currency and then converted to United States
         Dollars on the basis of the exchange rate in effect on the last working
         day for such  quarter for the  purchase of United  States  Dollars with
         such foreign  currency quoted in the Wall Street Journal (or comparable
         publication  if not quoted in the Wall Street  Journal) with respect to
         the currency of the country of origin of such  payment,  determined  by
         averaging the rates so quoted on each business day of such quarter.

5.6      If, at any time, legal restrictions in the Territory prevent the prompt
         payment when due of royalties or any portion thereof, the Parties shall
         meet to discuss suitable and reasonable  alternative  methods of paying
         Elan the amount of such royalties. In the event that Newco is prevented
         from making any payment under this Agreement by virtue of the statutes,
         laws,  codes or  government  regulations  of the country from which the
         payment is to be made,  then such  payments  may be paid by  depositing
         them in the  currency in which they accrue to Elan's  account in a bank
         acceptable  to Elan in the country the currency of which is involved or
         as otherwise agreed by the Parties.

5.7      Elan and Newco agree to  co-operate  in all respects  necessary to take
         advantage of any double  taxation  agreements or similar  agreements as
         may, from time to time, be available.

5.8      Any taxes  payable by Elan on any payment made to Elan pursuant to this
         Agreement  shall  be  for  the  account  of  Elan.  If so  required  by
         applicable  law, any payment made pursuant to this  Agreement  shall be
         made by Newco after  deduction of the appropriate  withholding  tax, in
         which event the Parties shall  co-operate to obtain the appropriate tax
         clearance  as soon as is  practicable.  On receipt  of such  clearance,
         Newco  shall  forthwith  arrange  payment  to  Elan  of the  amount  so
         withheld.


6        RIGHT OF INSPECTION AND AUDIT

6.1      Once during each Financial Year, or more often not to exceed  quarterly
         as  reasonably  requested by Elan,  Newco shall permit Elan or its duly
         authorised   representatives,   upon  reasonable   notice  and  at  any
         reasonable time during normal business hours, to have access to inspect
         and audit the accounts and records of Newco and any other book, record,
         voucher,  receipt or invoice relating to the calculation of the royalty
         payments on Net Sales submitted to Elan.

         Any such inspection of Newco's records shall be at the expense of Elan,
         except that if any such  inspection  reveals a deficiency in the amount
         of the royalty  actually paid to Elan  hereunder in any Financial  Year
         quarter of [REDACTED] or more of the amount of any royalty actually due
         to Elan hereunder,  then the expense of such inspection  shall be borne
         solely by Newco.  Any amount of  deficiency  shall be paid  promptly to
         Elan by Newco.

         If such  inspection  reveals  a  surplus  in the  amount  of  royalties
         actually paid to Elan by Newco,  Elan shall reimburse Newco the surplus
         within 15 days after determination.

                                       16
<PAGE>

6.2      In the event of any unresolved dispute regarding any alleged deficiency
         or  overpayment  of royalty  payments  hereunder,  the  matter  will be
         referred to an  independent  firm of  chartered  accountants  chosen by
         agreement of Sheffield and Elan for a resolution  of such dispute.  Any
         decision by the said firm of chartered  accountants shall be binding on
         the Parties.

 7       REPRESENTATIONS AND WARRANTIES

7.1      Elan  represents  and  warrants  to  Newco  and  Sheffield,  as of  the
         Effective Date, as follows:

         7.1.1    Elan has the right to grant the Elan Licenses;

         7.1.2    there are no  agreements  with any third parties that conflict
                  with the Elan Licenses.

7.2      In addition to any other  indemnities  provided for herein,  Elan shall
         indemnify  and  hold  harmless  Newco  and  its  Affiliates  and  their
         respective employees,  agents,  officers and directors from and against
         any  claims,  losses,  liabilities  or  damages  (including  reasonable
         attorney's  fees and  expenses)  incurred or sustained by Newco arising
         out of or in connection with any:

         7.2.1    breach of any representation, covenant, warranty or obligation
                  by Elan hereunder; or

         7.2.2    act or omission  on the part of Elan or any of its  respective
                  employees,  agents,  officers and directors in the performance
                  of this Agreement.

7.3      In addition to any other indemnities  provided for herein,  Newco shall
         indemnify  and  hold  harmless  Elan  and  its   Affiliates  and  their
         respective employees,  agents,  officers and directors from and against
         any  claims,  losses,  liabilities  or  damages  (including  reasonable
         attorney's fees and expenses) incurred or sustained by Elan arising out
         of or in connection with any:

         7.3.1    breach of any representation, covenant, warranty or obligation
                  by Newco hereunder; or

         7.3.2    act or  omission  on the part of Newco or any of its agents or
                  employees in the performance of this Agreement.

7.4      The Party seeking an indemnity shall:

         7.4.1    fully and  promptly  notify  the  other  Party of any claim or
                  proceeding, or threatened claim or proceeding;

         7.4.2    permit the indemnifying Party to take full care and control of
                  such claim or proceeding;

                                       17
<PAGE>

         7.4.3    co-operate in the  investigation  and defence of such claim or
                  proceeding;

         7.4.4    not   compromise  or  otherwise   settle  any  such  claim  or
                  proceeding  without  the prior  written  consent  of the other
                  Party,  which  consent  shall  not  be  unreasonably  withheld
                  conditioned or delayed; and

         7.4.5    take all reasonable steps to mitigate any loss or liability in
                  respect of any such claim or proceeding.

7.5      EXCEPT AS SET FORTH IN THIS  CLAUSE 7, ELAN IS  GRANTING  THE  LICENSES
         HEREUNDER  ON AN "AS  IS"  BASIS  WITHOUT  REPRESENTATION  OR  WARRANTY
         WHETHER EXPRESS OR IMPLIED INCLUDING  WARRANTIES OF  MERCHANTABILITY OR
         FITNESS  FOR A  PARTICULAR  PURPOSE,  OR  INFRINGEMENT  OF THIRD  PARTY
         RIGHTS, AND ALL SUCH WARRANTIES ARE EXPRESSLY DISCLAIMED.

7.6      NOTWITHSTANDING  ANYTHING TO THE CONTRARY IN THIS  AGREEMENT,  ELAN AND
         NEWCO SHALL NOT BE LIABLE TO THE OTHER BY REASON OF ANY  REPRESENTATION
         OR  WARRANTY,  CONDITION  OR OTHER TERM OR ANY DUTY OF COMMON  LAW,  OR
         UNDER  THE  EXPRESS  TERMS OF THIS  AGREEMENT,  FOR ANY  CONSEQUENTIAL,
         SPECIAL OR INCIDENTAL  OR PUNITIVE LOSS OR DAMAGE  (WHETHER FOR LOSS OF
         PROFITS OR OTHERWISE)  AND WHETHER  OCCASIONED BY THE NEGLIGENCE OF THE
         RESPECTIVE PARTIES, THEIR EMPLOYEES OR AGENTS OR OTHERWISE.


8.       TERM AND TERMINATION

8.1      The term of this Agreement  shall commence as of the Effective Date and
         shall, subject to the rights of termination outlined in this Clauses 8,
         expire on a Product-by-Product  basis and on a country-by-country basis
         on the last to occur of:

         8.1.1    [REDACTED]   years   starting  from  the  date  of  the  first
                  commercial sale of the Product in the country concerned; or

         8.1.2    the date of  expiration  of the last to expire of the  patents
                  included  in the Elan  Patents  and/or  the Elan  Improvements
                  and/or the Sheffield Patents and/or the Elan Improvements that
                  relate to the Product.

         ("the Term")

8.2      If either Party commits a Relevant  Event,  the other Party shall have,
         in  addition  to all other  legal and  equitable  rights  and  remedies
         hereunder,  the right to terminate  this  Agreement upon 30 days' prior
         written notice to the defaulting Party.

                                       18

<PAGE>

8.3      For the purpose of this Clause 8, a "Relevant  Event" is  committed  or
         suffered by a Party if:

         8.3.1    [REDACTED]

         8.3.2    [REDACTED]

         8.3.3    [REDACTED]

         8.3.4    [REDACTED]

         8.3.5    [REDACTED]

         8.3.6    [REDACTED]

8.4      Elan shall be entitled to  forthwith  terminate  this  Agreement in the
         event of a Change of Control of Sheffield/Newco.

         As provided in Clause 8.4 of the Sheffield License Agreement, Sheffield
         shall be entitled to terminate the Sheffield  License Agreement if Elan
         elects to terminate the Elan Licenses hereunder.

8.5      Upon expiration or termination of the Agreement:

         8.5.1.   any sums that were due from  Newco to Elan on Net Sales in the
                  Territory  or in such  particular  country or countries in the
                  Territory  (as the case may be)  prior  to the  expiration  or
                  termination  of this  Agreement  as set forth  herein shall be
                  paid  in  full  within  60  days  after  the   expiration   or
                                       19

<PAGE>

                  termination  of this  Agreement  for the Territory or for such
                  particular  country or countries in the Territory (as the case
                  may be);

         8.5.2    any   provisions   that  expressly   survive   termination  or
                  expiration of this  Agreement,  including  without  limitation
                  this Clause 8, shall remain in full force and effect;

         8.5.3    all representations,  warranties and indemnities shall insofar
                  as are appropriate remain in full force and effect;

         8.5.4    the rights of  inspection  and audit set out in Clause 6 shall
                  continue in force for a period of one year; and

         8.5.5    all rights and licenses granted pursuant to this Agreement and
                  to  the  Elan  Intellectual  Property  pursuant  to  the  JDOA
                  (including  the rights of Newco  pursuant  to Clause 11 of the
                  JDOA) shall  cease for the  Territory  or for such  particular
                  country or countries in the Territory (as the case may be) and
                  shall revert to or be transferred to Elan, and Newco shall not
                  thereafter use in the Territory or in such particular  country
                  or countries in the  Territory (as the case may be) any rights
                  covered by this Agreement;

         8.5.6    subject to Clause 8.5.7 and to such license,  if any,  granted
                  by Newco to Elan  pursuant to the  provisions  of Clause 12 of
                  the JDOA, all rights to Newco  Intellectual  Property shall be
                  transferred to and jointly owned by Sheffield and Elan and may
                  only be exploited by either Elan or Sheffield with the consent
                  of the  other  Party  pursuant  to a written  agreement  to be
                  negotiated in good faith;

         8.5.7    the rights of permitted  third party  sub-licensees  in and to
                  the Elan  Intellectual  Property shall survive the termination
                  of  the  license  and  sublicense   agreements  granting  said
                  intellectual  property  rights to Newco;  and Newco,  Elan and
                  Sheffield  shall  in good  faith  agree  upon  the  form  most
                  advantageous  to Elan and  Sheffield  in which  the  rights of
                  Newco under any such licenses and  sublicenses  are to be held
                  (which form may include  continuation  of Newco  solely as the
                  holder of such  licenses  or  assignment  of such  rights to a
                  third party or parties,  including an  assignment to both Elan
                  and Sheffield).

                  Any  sublicense  agreement  between  Newco and such  permitted
                  sublicensee  shall permit an assignment of rights by Newco and
                  shall contain appropriate confidentiality provisions.

8.6      In the event that the Parties and Sheffield mutually agree to terminate
         the portion of the  Project  (as defined in the JDOA) which  relates to
         Field A, the license  described  in Clause  2.1.1,  the  provisions  of
         Clause 4.1 and the  provisions of Clause 4.3 (insofar as the provisions
         of Clause 4.3 relate to Field A) shall automatically terminate.

                                       20

<PAGE>

9        CONFIDENTIAL INFORMATION

9.1      The  Parties  agree that it will be  necessary,  from time to time,  to
         disclose  to  each  other  confidential  and  proprietary  information,
         including without limitation,  inventions,  works of authorship,  trade
         secrets, specifications,  designs, data, know-how and other proprietary
         information  relating to the Combined Fields, the Products,  processes,
         services and business of the disclosing Party.

         The  foregoing  shall be  referred  to  collectively  as  "Confidential
         Information".

9.2      Any  Confidential  Information  disclosed by one Party to another Party
         shall be used by the receiving  Party  exclusively  for the purposes of
         fulfilling the receiving  Party's  obligations under this Agreement and
         the JDOA and for no other purpose.

9.3      Each Party shall disclose  Confidential  Information of the other Party
         only to those employees, representatives and agents requiring knowledge
         thereof in connection  with  fulfilling the Party's  obligations  under
         this Agreement. Each Party further agrees to inform all such employees,
         representatives  and  agents  of  the  terms  and  provisions  of  this
         Agreement  and their duties  hereunder  and to obtain  their  agreement
         hereto as a condition of receiving Confidential Information. Each Party
         shall exercise the same standard of care as it would itself exercise in
         relation to its own confidential information (but in no event less than
         a reasonable  standard of care) to protect and preserve the proprietary
         and confidential nature of the Confidential Information disclosed to it
         by the other Party.  Each Party shall, upon request of the other Party,
         return all documents  and any copies  thereof  containing  Confidential
         Information belonging to, or disclosed by, such other Party.

9.4      Any  breach  of this  Clause  9 by any  person  informed  by one of the
         Parties is considered a breach by the Party itself.

9.5      Confidential Information shall not be deemed to include:

         9.5.1    information that is in the public domain;

         9.5.2    information  which is made  public  through  no breach of this
                  Agreement;

         9.5.3    information  which is  independently  developed  by a Party as
                  evidenced by such Party's records;

         9.5.4    information   that   becomes   available   to  a  Party  on  a
                  non-confidential basis, whether directly or indirectly, from a
                  source  other than a Party,  which source did not acquire this
                  information on a confidential basis; or

         9.5.5    information  which the receiving Party is required to disclose
                  pursuant to:

                  (i)   a valid order of a court or other governmental body; or

                  (ii)  any other requirement of law;

                                       21
<PAGE>

                  provided that if the receiving Party becomes legally  required
                  to disclose any Confidential Information,  the receiving Party
                  shall give the disclosing  Party prompt notice of such fact so
                  that the  disclosing  Party may obtain a  protective  order or
                  other appropriate  remedy concerning any such disclosure.  The
                  receiving  Party shall fully  co-operate  with the  disclosing
                  Party in connection  with the  disclosing  Party's  efforts to
                  obtain  any such order or other  remedy.  If any such order or
                  other remedy does not fully preclude disclosure, the receiving
                  Party shall make such  disclosure only to the extent that such
                  disclosure is legally required.

9.6      The  provisions  relating  to  confidentiality  in this  Clause 9 shall
         remain in effect during the term of this Agreement, and for a period of
         7  years  following  the  expiration  or  earlier  termination  of this
         Agreement.

9.7      The Parties agree that the  obligations  of this Clause 9 are necessary
         and reasonable in order to protect the Parties' respective  businesses,
         and each Party agrees that  monetary  damages  would be  inadequate  to
         compensate  a Party for any breach by the other Party of its  covenants
         and agreements set forth herein.

         Accordingly,  the Parties  agree that any such  violation or threatened
         violation  shall  cause  irreparable  injury to a Party  and  that,  in
         addition to any other remedies that may be available, in law and equity
         or otherwise,  each Party shall be entitled to obtain injunctive relief
         against the threatened  breach of the provisions of this Clause 9, or a
         continuation   of  any  such  breach  by  the  other  Party,   specific
         performance and other equitable  relief to redress such breach together
         with its damages and  reasonable  counsel  fees and expenses to enforce
         its rights  hereunder,  without  the  necessity  of  proving  actual or
         express damages.

9.8      For the  avoidance  of doubt,  all  Confidential  Information  of Newco
         received by Elan hereunder shall not be disclosed by Elan to Affiliates
         and/or  subsidiaries  (present  or  future) of Elan  Corporation,  Plc.
         within the division of Elan  Corporation,  Plc. carrying on business as
         Elan   Pharmaceuticals   which   incorporates,   inter   alia,   Targon
         Corporation,  Athena Neurosciences,  Inc., Elan Pharmaceuticals,  Inc.,
         Elan Diagnostics, Carnrick Laboratories, and Elan Europe Limited.


10       GOVERNING LAW AND JURISDICTION

10.1     This  Agreement  shall be governed by and construed in accordance  with
         the laws of the State of New York.

10.2     The Parties will  attempt in good faith to resolve any dispute  arising
         out of or relating to this Agreement  promptly by  negotiation  between
         executives of the Parties.  In the event that such  negotiations do not
         result  in a  mutually  acceptable  resolution,  the  Parties  agree to
         consider other dispute resolution mechanisms including mediation.

         In the event that the  Parties  fail to agree on a mutually  acceptable

                                       22
<PAGE>

         dispute resolution mechanism, any such dispute shall be finally settled
         by the  courts of  competent  jurisdiction.  For the  purposes  of this
         Agreement the parties submit to the  non-exclusive  jurisdiction of the
         courts of the State of New York.

11       IMPOSSIBILITY OF PERFORMANCE - FORCE MAJEURE

         Neither Elan nor Newco shall be liable for delay in the  performance of
         any of its  obligations  hereunder  if such delay  results  from causes
         beyond its reasonable control,  including,  without limitation, acts of
         God,  fires,  strikes,  acts  of  war,  intervention  of  a  government
         authority,  but any such delay or  failure  shall be  remedied  by such
         Party as soon as practicable.

12       ASSIGNMENT

         This  Agreement  may not be assigned by either Party  without the prior
         written  consent of the other,  save that either  Party may assign this
         Agreement to its Affiliates or subsidiaries  without such prior written
         consent  provided  that such  assignment  does not have any adverse tax
         consequences on the other Party.

13       NOTICES

13.1     Any notice to be given under this Agreement shall be sent in writing in
         English by registered airmail or telefaxed to the following addresses:

         If to Newco at:

         Clarendon House,
         2 Church Street,
         Hamilton,
         Bermuda
         Attention:   Secretary
         Telephone:   441 292 9169
         Fax:         441 292 2224

         with a copy to Elan and Sheffield at the addresses listed below:

         If to Sheffield at:
         Sheffield Pharmaceuticals, Inc.
         425 S. Woodsmill Road
         Suite 270
         St Louis
         MO 63017
         USA.

                                       23

<PAGE>

         Attn: Chief Executive Officer
         Telephone   001 314 579 9899
         Fax:        001 314 579 9799

         with a copy to:

         Daniel Gallagher, Esq.
         Olshan, Grundman, Trome
         Rosenzeig, LLP
         505 Park Avenue
         New York, NY 10022
         Telephone    002 212 753 7200
         Fax:         001 212 935 1787


         If to Elan at:

         Elan Corporation, plc
         Lincoln House,
         Lincoln Place,
         Dublin 2,
         Ireland.
         Attention: Vice President, General Counsel,
         Elan Pharmaceutical Technologies,
         a division of Elan Corporation, plc
         Telephone:  + 353 1 709 4000
         Telefax:      + 353 1 709 4124

         or to such other  address(es)  and telefax  numbers as may from time to
         time be notified by either Party to the other hereunder.

13.2     Any notice sent by mail shall be deemed to have been  delivered  within
         seven 7 working  days after  dispatch  and any notice  sent by telex or
         telefax shall be deemed to have been  delivered  within twenty 24 hours
         of the time of the  dispatch.  Notice  of change  of  address  shall be
         effective upon receipt.

14       MISCELLANEOUS

14.1     Waiver:

         No waiver of any right under this Agreement  shall be deemed  effective
         unless contained in a written document signed by the Party charged with
         such waiver, and no waiver of any breach or failure to perform shall be
         deemed to be a waiver of any other  breach or  failure to perform or of
         any other right arising under this Agreement.


                                       24
<PAGE>

14.2     Severability:

         If any  provision in this  Agreement is agreed by the Parties to be, or
         is deemed to be, or becomes  invalid,  illegal,  void or  unenforceable
         under any law that is applicable hereto:

         14.2.1   such provision will be deemed amended to conform to applicable
                  laws so as to be valid and enforceable; or

         14.2.2   if it cannot be so amended  without  materially  altering  the
                  intention of the Parties, it will be deleted, with effect from
                  the date the Parties may agree, and the validity, legality and
                  enforceability  of the remaining  provisions of this Agreement
                  shall not be impaired or affected in any way.

14.3     Further Assurances:

         At the request of any of the Parties,  the other Party or Parties shall
         (and shall use reasonable  efforts to procure that any other  necessary
         parties shall) execute and perform all such documents,  acts and things
         as may  reasonably  be  required  subsequent  to the  signing  of  this
         Agreement for assuring to or vesting in the  requesting  Party the full
         benefit of the terms hereof.

14.4     Successors:

         This  Agreement  shall be binding  upon and enure to the benefit of the
         Parties hereto, their successors and permitted assigns.

14.5     No Effect on Other Agreements/Conflict:

         No  provision  of this  Agreement  shall be  construed so as to negate,
         modify  or  affect in any way the  provisions  of any  other  agreement
         between the Parties unless specifically  referred to, and solely to the
         extent provided herein.

         In the event of a conflict between the provisions of this Agreement and
         the  provisions of the JDOA, the terms of the JDOA shall prevail unless
         this Agreement specifically provides otherwise.

14.6     Amendments:

         No  amendment,  modification  or addition  hereto shall be effective or
         binding on any Party unless set forth in writing and executed by a duly
         authorised representative of each Party.

14.7     Counterparts:

         This Agreement may be executed in any number of  counterparts,  each of
         which when so  executed  shall be deemed to be an  original  and all of
         which when taken together shall constitute this Agreement.
                                       25

<PAGE>

14.8     Good Faith:

         Each  Party  undertakes  to do all things  reasonably  within its power
         which are  necessary  or  desirable  to give  effect to the  spirit and
         intent of this Agreement.

14.9     No Reliance:

         Each Party hereby  acknowledges that in entering into this Agreement it
         has not relied on any  representation or warranty save as expressly set
         out herein or in any document referred to herein.

14.10    Relationship of the Parties:

         Nothing  contained in this  Agreement is intended or is to be construed
         to  constitute  Elan and Newco as  partners,  or Elan as an employee of
         Newco, or Newco as an employee of Elan.

         Neither  Party  hereto  shall  have any  express  or  implied  right or
         authority  to assume or create any  obligations  on behalf of or in the
         name of the  other  Party or to bind the other  Party to any  contract,
         agreement or undertaking with any third party.




                                       26
<PAGE>
                                   SCHEDULE 1

                                  ELAN PATENTS


                                   [REDACTED]



<PAGE>
                                   SCHEDULE 2

                       TECHNOLOGICAL COMPETITORS OF ELAN



                                   [REDACTED]





<PAGE>
                                   SCHEDULE 3

                         List of Steroids for Clause 4.1




                                   [REDACTED]





<PAGE>

IN WITNESS WHEREOF the Parties hereto have executed this Agreement.




/S/
SIGNED BY
for and on behalf of
ELAN PHARMA INTERNATIONAL LIMITED




/S/
SIGNED BY
For and on behalf of
SHEFFIELD NEWCO LIMITED




/S/
AGREED TO AND ACCEPTED BY
SHEFFIELD PHARMACEUTICALS, INC.



                          REGISTRATION RIGHTS AGREEMENT


         THIS  REGISTRATION  RIGHTS  AGREEMENT (the  "Agreement")  is made as of
October 18,  1999 by and between  Sheffield  Pharmaceuticals,  Inc.,  a Delaware
corporation (the "Company"),  and Elan International  Services,  Ltd., a Bermuda
exempted  limited  liability  company  incorporated  under  the laws of  Bermuda
("EIS").

                                R E C I T A L S:

         A.  Pursuant  to  a  Securities   Purchase   Agreement  (the  "Purchase
Agreement") by and between EIS and the Company, dated as of the date hereof, the
Company has issued to EIS (i) shares of Series D Preferred Stock; (ii) shares of
Series F Preferred Stock; and (iii) a Warrant to acquire up to 150,000 shares of
the Common Stock.

         B. In  addition,  pursuant to the Purchase  Agreement,  the Company may
require that EIS purchase  shares of Series E Preferred  Stock with an aggregate
stated value of up to $4,005,000.

         C. The closings under the Purchase  Agreement have occurred on the date
hereof;  it being a condition  to such  closings  that the  parties  execute and
deliver this Agreement.

         D. The parties desire to set forth herein their  agreement  relating to
the granting of certain  resale  registration  rights to the Holders (as defined
below) of the Common Stock issuable upon conversion, exercise or exchange of any
of the other  Securities.  All capitalized  terms used in this Agreement and not
otherwise  defined  herein shall have the meaning  ascribed to such terms in the
Purchase Agreement.


                               A G R E E M E N T:

         The parties hereto agree as follows:

         1. CERTAIN DEFINITIONS.  As used in this Agreement, the following terms
shall have the following respective meanings:

         "Affiliate"  of any  Person  shall mean any other  Person  controlling,
controlled by or under common control with such particular  Person.  In the case
of a natural Person,  his Affiliates  include



<PAGE>
members of such Person's  immediate family,  natural lineal  descendants of such
Person or a trust for the  exclusive  benefit of such  Person and his  immediate
family and natural lineal descendants.

         "Commission"  shall mean the Securities and Exchange  Commission or any
other federal agency at the time administering the Securities Act.

         "Common  Stock" shall mean the common stock,  par value $0.01 per share
of the Company.

         "Holder",  "Holders" or "Holders of Registrable  Securities" shall mean
EIS and any Person who shall have acquired  Registrable  Securities  from EIS as
permitted herein, either individually or jointly as the case may be.

         "Person"  shall  mean an  individual,  a  partnership,  a  company,  an
association,  a joint stock company, a trust, a joint venture, an unincorporated
organization and a governmental or quasi-governmental  entity or any department,
agency or political subdivision thereof.

         "Preferred  Stock"  shall  mean,  collectively,  the Series D Preferred
Stock, the Series E Preferred Stock and the Series F Preferred Stock.

         "Registrable  Securities" means (i) any Common Stock issued or issuable
upon  conversion,  exchange  or  exercise of the  Securities  held or  otherwise
acquired by any Holders, and (ii) any Common Stock issued or issuable in respect
of the  securities  referred to in clause (i) above upon any stock split,  stock
dividend,  recapitalization or similar event;  excluding in all cases,  however,
any  Registrable  Securities  sold by a Person  in a  transaction  (including  a
transaction  pursuant to a  registration  statement  under this  Agreement and a
transaction  pursuant to Rule 144 promulgated under the Securities Act) in which
registration rights are not transferred pursuant to Section 9 hereof.

         "Register,"  "Registered"  and  "Registration"  shall refer to a resale
registration  effected  by  preparing  and filing a  registration  statement  in
compliance  with the  Securities  Act,  and the  declaration  or ordering of the
effectiveness of such registration statement.

         "Registration  Expenses"  shall mean all  expenses,  other than Selling
Expenses,  incurred by the  Company in  complying  with  Sections 2 or 3 hereof,
including without limitation,  all registration,  qualification and filing fees,
exchange listing fees, printing expenses, escrow fees, fees and disbursements of
counsel for the Company, blue sky fees and expenses,  the expense of any special
audits incident to or required by any such  registration and the reasonable fees
and disbursements,  of one counsel for the Holders,  such counsel to be selected
by Holders holding a majority of the Registrable  Securities held by the Holders
and included in such registration.

                                       2

<PAGE>

         "Requisite  Holders"  shall  mean  Holders  holding at least 50% of the
authorized and outstanding Preferred Stock.

         "Securities"  shall mean shares of Series D Preferred  Stock,  Series E
Preferred Stock,  Series F Preferred Stock and the Warrant,  in each case issued
to EIS pursuant to the Purchase Agreement.

         "Securities Act" shall mean the Securities Act of 1933, as amended,  or
any similar  federal  statute and the rules and  regulations  of the  Commission
thereunder, all as the same shall be in effect at the time.

         "Selling  Expenses"  shall  mean all  underwriting  discounts,  selling
commissions and stock transfer taxes applicable to the securities  registered by
the Holders and the costs of any accountants,  counsel or other experts retained
by the Holders.

         "1934 Act" shall mean the Securities  Exchange Act of 1934, as amended,
or any similar  federal  statute and the rules and regulations of the Commission
thereunder, all as the same shall be in effect at the time.

         2.  Demand  Registration.  (a) Request or  exercise  for  Registration.
Requisite  Holders  shall  have the  right at any  time and on one  occasion  to
request  registration under the Securities Act of all or part of the Registrable
Securities  held by such Holder on Form S-3, or if such form is unavailable  for
such a  registration,  such other form as is available  for such a  registration
(the "Demand Registration"). A Demand Registration shall specify the approximate
number of  Registrable  Securities  requested to be  registered.  Within 10 days
after receipt of any such request,  the Company will give written notice of such
requested  registration  to all other Holders of Registrable  Securities and, if
they request to be included in such registration,  the Company shall include the
Registrable  Securities  held by such  Holders  in such  offering  if they  have
responded  affirmatively  within 15 days  after  the  receipt  of the  Company's
notice.  The  Holders  in  aggregate  will be  entitled  to  request  one Demand
Registration. A registration will not count as the permitted Demand Registration
until it has become  effective  (unless the Demand  Registration  has not become
effective due solely to the fault of the Holders  requesting such  registration,
including a request by such Holders that such  registration  be withdrawn).  The
Company  will pay all  Registration  Expenses  in  connection  with  the  Demand
Registration whether or not it has become effective.

               (b) Priority on Demand  Registration.  If the Demand Registration
is an underwritten  offering and the managing underwriter or underwriters advise
the  Company  in  writing  that in  their  opinion  the  number  of  Registrable
Securities  and,  if  permitted  hereunder,  other  securities  requested  to be
included in such  offering,  exceeds the number of  Registrable  Securities  and
other  securities,  if any, which can be sold in such offering without adversely
affecting the  marketability  of the offering,  the Company will include in such
registration:
                                       3

<PAGE>


                    (i)  first,  the  Registrable  Securities  requested  to  be
               included in such  registration  by the Holders (or, if necessary,
               such  Registrable  Securities pro rata among the Holders  thereof
               based upon the  number of  Registrable  Securities  owned by each
               such Holder); and

                    (ii) thereafter,  other securities  requested to be included
               in such registration.

               (c) Restrictions on Demand Registration. The Company may postpone
for up to three months in any 12 month period,  the filing or the  effectiveness
of  a  registration  statement  for  the  Demand  Registration  if  the  Company
determines  in good faith that such  Demand  Registration  would  reasonably  be
expected  to have a  material  adverse  effect  on any  proposal  or plan by the
Company  to engage in any  acquisition  of assets  (other  than in the  ordinary
course of  business)  or any  merger,  consolidation,  tender  offer or  similar
transaction; provided, that in such event, the Holders initially requesting such
Demand  Registration  will be  entitled to withdraw  such  request  and, if such
request is  withdrawn,  such  Demand  Registration  will not count as the Demand
Registration  hereunder  and the Company will pay all  Registration  Expenses in
connection with such registration.

               (d) Selection of Underwriters. The Holders will have the right to
select the  investment  banker(s)  and  manager(s)  to  administer  an  offering
pursuant to the Demand  Registration,  subject to the Company's approval,  which
will not be unreasonably withheld.

               (e)  Other  Registration  Rights.  Except  as  provided  in  this
Agreement,  so long as any Holder owns any Registrable  Securities,  the Company
will not grant to any Persons  the right to request the Company to register  any
equity securities of the Company, or any securities convertible, exchangeable or
exercisable  for such  securities,  which is superior to or in conflict with the
rights granted to the Holders  hereunder,  without the prior written  consent of
the Requisite Holders; it being understood,  however, that the Company may grant
rights to other  Persons  to (i)  participate  in  Piggyback  Registrations  (as
defined  below) so long as such  rights  are  subordinate  or pari  passu to the
rights of the Holders of Registrable  Securities  with respect to such Piggyback
Registrations  and  (ii)  request  registrations  so  long  as  the  Holders  of
Registrable  Securities are entitled to  participate  in any such  registrations
with such  Persons  pro rata on the basis of the number of shares  owned by each
such Holder.

         3.  Piggyback  Registrations.  (a)  Right to  Piggyback.  Whenever  the
Company  proposes to register any of its  securities  under the  Securities  Act
(each, a "Piggyback Registration"),  the Company will give prompt written notice
to all  Holders of  Registrable  Securities  of its  intention  to effect such a
registration and, subject to Section 3(b) and the other terms of this Agreement,
will include in such  registration  all  Registrable  Securities with respect to
which the Company has received written requests for inclusion  therein within 15
days after the receipt of the Company's


                                       4

<PAGE>

notice.  Notwithstanding  the  foregoing,  a  Piggyback  Registration  shall not
include any registration statement (i) on Form S-8 or any successor form to such
form,  (ii) on Form  S-4 or any  successor  form to such  form,  (iii)  filed in
connection  with  an  exchange  offer  or an  offering  of  Common  Stock  or of
securities  convertible  or  exchangeable  into Common  Stock made solely to its
existing  stockholders  in  connection  with a rights  offering or solely to the
Company's  employees,  or a  post-effective  amendment  to  any  then  effective
registration statement.

               (b)   Priority  on  Piggyback   Registrations.   If  a  Piggyback
Registration is an underwritten  registration on behalf of the Company,  and the
managing  underwriter(s) advise the Company in writing that in their opinion the
number of securities  requested to be included in such registration  exceeds the
number  which  can be sold in such  offering  without  adversely  affecting  the
marketability of the offering, the Company will include in such registration:

                    (i) first, the securities the Company proposes to sell;

                    (ii)  second,  the  Registrable  Securities  requested to be
         included  in  such  registration  by the  Holders  and  any  securities
         requested to be included in such  registration by any other Person that
         is entitled to  registration  rights  that are not  subordinate  to the
         rights of the Holders,  pro rata among the Holders of such  Registrable
         Securities and such other Persons, on the basis of the number of shares
         owned by each of such Holders; and

                    (iii) thereafter,  other securities requested to be included
         in such registration.

               (c) Right to Terminate Registration. If, at any time after giving
written  notice of its intention to register any of its  securities as set forth
in Section 3(a) and prior to the effective  date of the  registration  statement
filed in connection with such registration,  the Company shall determine for any
reason not to register such securities,  the Company may, at its election,  give
written notice of such  determination  to each Holder of Registrable  Securities
and  thereupon  be  relieved  of its  obligation  to  register  any  Registrable
Securities in connection with such  registration (but not from its obligation to
pay the Registration Expenses in connection therewith as provided herein).

               (d) Selection of Underwriters. The Company will have the right to
select the  investment  banker(s)  and  manager(s)  to  administer  an  offering
pursuant to a Piggyback Registration.

         4. Expenses of Registration.  Except as otherwise  provided herein, all
Registration Expenses incurred in connection with all registrations  pursuant to
Sections 2 and 3 shall be borne by the Company.  Unless  otherwise  stated,  all
Selling Expenses  relating to securities  registered on behalf of the Holders of
Registrable Securities shall be borne by such holders.



                                       5

<PAGE>

         5. Holdback  Agreements.  (a) The Company  agrees (i) not to effect any
public sale or distribution for its own account of its equity securities, or any
securities  convertible into or exchangeable or exercisable for such securities,
during the seven days prior to and  during the 90-day  period  beginning  on the
effective  date of the  underwritten  Demand  Registration  or any  underwritten
Piggyback  Registration  (except as part of such  underwritten  registration  or
pursuant  to  registrations  on Form  S-8 or any  successor  form),  unless  the
underwriter(s) managing the registered public offering otherwise agree, and (ii)
to  use  reasonable  efforts  to  cause  each  Holder  of  at  least  5%  (on  a
fully-diluted basis) of its Common Stock, or any securities  convertible into or
exchangeable or exercisable for Common Stock,  purchased from the Company at any
time  after  the  date of this  Agreement  (other  than in a  registered  public
offering)  to agree not to effect any  public  sale or  distribution  (including
sales pursuant to Rule 144) of any such  securities  during such periods (except
as part of such underwritten registration,  if otherwise permitted),  unless the
underwriter(s) managing the registered public offering otherwise agree.

               (b) Each  Holder  of  Registrable  Securities  whose  Registrable
Securities are eligible for inclusion in a Registration Statement filed pursuant
to Section 2 hereof agrees,  if requested by the managing  underwriter(s)  in an
underwritten  offering of any Registrable  Securities,  not to effect any public
sale or  distribution  of Registrable  Securities,  including a sale pursuant to
Rule 144 (or any similar provision then effect) under the Securities Act (except
as part of such  underwritten  registration),  during the seven-day period prior
to, and during the 90-day  period or such shorter  period as may be agreed to by
the parties hereto) following the effective date of such Registration  Statement
to the  extent  timely  notified  in  writing  by the  Company  or the  managing
underwriter or underwriters.

         6.  Registration  Procedures.   Whenever  the  Holders  of  Registrable
Securities have requested that any Registrable Securities be registered pursuant
to this  Agreement,  the  Company  will  use its  best  efforts  to  effect  the
registration and the sale of such Registrable  Securities in accordance with the
intended method of distribution  thereof,  and pursuant thereto the Company will
as expeditiously as possible:

               (a) prepare and file with the Commission a registration statement
on any form for which the Company  qualifies  with  respect to such  Registrable
Securities  and use its best  efforts to cause such  registration  statement  to
become  effective  (provided  that before  filing a  registration  statement  or
prospectus  or any  amendments  or  supplements  thereto,  the Company  will (i)
furnish to the  counsel  selected by the  Holders  copies of all such  documents
proposed  to be filed,  which  documents  will be  subject to the review of such
counsel,  and (ii) notify each holder of Registrable  Securities covered by such
registration of any stop order issued or threatened by the Commission);

               (b)  prepare and file with the  Commission  such  amendments  and
supplements to such registration statement and the prospectus used in connection
therewith as may be necessary to keep such registration  statement effective for
a period of not less than nine  months and  comply  with the


                                       6

<PAGE>

provisions  of  the  Securities  Act  with  respect  to the  disposition  of all
securities  covered  by  such  registration  statement  during  such  period  in
accordance  with the intended  methods of disposition by the sellers thereof set
forth in such registration statement;

               (c) furnish to each seller of Registrable  Securities such number
of copies of such registration statement, each amendment and supplement thereto,
the  prospectus  included  in  such  registration   statement   (including  each
preliminary  prospectus)  and such other documents as such seller may reasonably
request in order to facilitate  the  disposition of the  Registrable  Securities
owned by such seller;

               (d) use its best efforts to register or qualify such  Registrable
Securities under such other securities or blue sky laws of such  jurisdiction as
any seller  reasonably  requests  and do any and all other acts and things which
may be reasonably necessary or advisable to enable such seller to consummate the
disposition in such  jurisdictions  of the Registrable  Securities owned by such
seller (provided that the Company will not be required to (i) qualify  generally
to do business in any  jurisdiction  where it would not otherwise be required to
qualify  but for this  Section  6(d),  (ii)  subject  itself to  taxation in any
jurisdiction  or  (iii)  consent  to  general  service  of  process  in any such
jurisdiction);

               (e) notify each  seller of such  Registrable  Securities,  at any
time when a prospectus  relating  thereto is required to be delivered  under the
Securities  Act,  of the  happening  of any  event  as a  result  of  which  the
prospectus included in such registration  statement contains an untrue statement
of a material fact or omits any fact  necessary to make the  statements  therein
not misleading, and, at the request of any such seller, the Company will prepare
a supplement of amendment to such prospectus so that, as thereafter delivered to
the purchasers of such Registrable Securities,  such prospectus will not contain
an untrue  statement of a material  fact or omit to state any fact  necessary to
make the statements therein not misleading;

               (f) Use its best efforts to cause all such Registrable Securities
to be listed on each securities  exchange on which similar  securities issued by
the Company  are then  listed  and,  if not so listed,  to be listed on the NASD
automated  quotation  system  and,  if  listed on the NASD  automated  quotation
system,  use its best  efforts  to secure  designation  of all such  Registrable
Securities  covered by such  registration  statement as a NASDAQ National market
system security within the meaning of Rule 11Aa2-1 of the Commission or, failing
that,  to secure  NASDAQ  authorization  for such  Registrable  Securities  and,
without  limiting the generality of the  foregoing,  to arrange for at least two
market  makers to register as such with respect to such  Registrable  Securities
with the NASD;

               (g)  provide  a  transfer   agent  and  registrar  for  all  such
Registrable  Securities not later than the effective  date of such  registration
statement;


                                       7
<PAGE>

               (h) enter into such customary agreements (including  underwriting
agreements in customary  form) and take all such other actions as the holders of
a majority of the Registrable  Securities being sold or the  underwriter(s),  if
any,  reasonably  request in order to expedite or facilitate the  disposition of
such Registrable Securities;

               (i) make  available  for  inspection by a  representative  of the
Holders of Registrable  Securities included in the registration  statement,  any
underwriter(s)  participating in any disposition  pursuant to such  registration
statement  and any  attorney,  accountant  or other  agent  retained by any such
seller or underwriter, subject to a confidentiality agreement in customary form,
all pertinent  financial and other records,  pertinent  corporate  documents and
properties  of  the  Company,  and  cause  the  Company's  officers,  directors,
employees  and  independent  accountants  to supply all  information  reasonably
requested  by any such seller,  underwriter,  attorney,  accountant  or agent in
connection with such registration statement;

               (j)  otherwise  use its  reasonable  efforts  to comply  with all
applicable  rules and regulations of the  Commission,  and make available to its
security  holders,  as soon as  reasonably  practicable,  an earnings  statement
covering  the period of at least 12 months  beginning  with the first day of the
Company's  first  full  calendar   quarter  after  the  effective  date  of  the
registration statement, which earnings statement shall satisfy the provisions of
Section 11(a) of the Securities Act and Rule 158 thereunder.

               (k) in the event of the issuance of any stop order suspending the
effectiveness  of a  registration  statement,  or of  any  order  suspending  or
preventing the use of any related  prospectus or suspending the qualification of
Common  Stock  included  in  such   registration   statement  for  sale  in  any
jurisdiction,  the Company  will use its  reasonable  best  efforts  promptly to
obtain the withdrawal of such order;

               (l) obtain a so-called  "cold comfort"  letter from the Company's
independent  public  accountants  in customary form and covering such matters of
the type customarily covered by such letters; and

               (m)  undertake  such other  actions and do all other things which
the Holders  shall  reasonably  request and which shall be customary at the time
for such registrations.

         7. Indemnification. (a) The Company agrees to indemnify, to the fullest
extent permitted by applicable law, each Holder of Registrable  Securities,  its
officers  and  directors  and each Person who controls  such Holder  (within the
meaning of the Securities Act) against all losses, claims, damages, liabilities,
expenses or any amounts paid in settlement of any litigation,  investigation  or
proceeding  commenced or threatened  (collectively,  the "Claims") to which each
such  indemnified  party may become  subject under the Securities Act insofar as
such  Claim(s)  arose  out of (i) any  untrue or  alleged  untrue  statement  of
material fact  contained,  on the effective  date thereof,  in any  registration
                                       8

<PAGE>
statement,  prospectus or  preliminary  prospectus  or any amendment  thereof or
supplement  thereto,  (ii) any omission or alleged  omission to state  therein a
material fact required to be stated  therein or necessary to make the statements
therein not  misleading,  or (iii) any violations by the Company of any federal,
state or common law rule or regulation applicable to the Company and relating to
action  required  of or  inaction  by the  Company in  connection  with any such
registration,  except  insofar  as the same are  caused by or  contained  in any
information furnished in writing to the Company by such Holder expressly for use
therein  or by such  Holder's  failure  to  deliver  a copy of the  registration
statement or  prospectus  or any  amendments  or  supplements  thereto after the
Company has  furnished  such Holder  with a  sufficient  number of copies of the
same. In connection  with an underwritten  offering,  the Company will indemnify
such  underwriter(s),  their officers and directors and each Person who controls
such  underwriter(s)  (within  the  meaning of the  Securities  Act) to the same
extent as provided above with respect to the  indemnification  of the holders of
Registrable Securities.

               (b) In  connection  with any  registration  statements in which a
Holder of Registrable Securities is participating, each such Holder will furnish
to the Company in writing  such  customary  information  and  affidavits  as the
Company  reasonably  requests for use in connection  with any such  registration
statement or prospectus (the "Seller's  Information") and, to the fullest extent
permitted by  applicable  law will  indemnify  the Company,  its  directors  and
officers  and each Person who  controls  the Company  (within the meaning of the
Securities Act) against any and all Claims to which each such indemnified  party
may become  subject under the  Securities Act insofar as such Claim(s) arose out
of (i) any untrue or alleged untrue statement of material fact contained, on the
effective date thereof, in any registration statement, prospectus or preliminary
prospectus or any amendment thereof or supplement thereto,  (ii) any omission or
alleged  omission to state therein a material fact required to be stated therein
or  necessary  to make the  statements  therein  not  misleading  or  (iii)  any
violations by such Person of any federal, state or common law rule or regulation
applicable to such Person and relating to action required of or inaction by such
Person in connection with any such  registration;  provided that with respect to
Claim(s) arising pursuant to clause (i) or (ii) above, the material misstatement
or omission is contained in such Seller's Information;  provided,  further, that
the  obligation  to  indemnify  will be  individual  to each  Holder and will be
limited to the net amount of  proceeds  received by such Holder from the sale of
Registrable Securities pursuant to such registration statement.

               (c) Any Person  entitled to  indemnification  hereunder  will (i)
give prompt written notice to the  indemnifying  party of any claim with respect
to which it seeks  indemnification (but the failure to provide such notice shall
not release the  indemnifying  party of its obligation  under paragraphs (a) and
(b),  unless and then only to the extent  that the  indemnifying  party has been
prejudiced  by such  failure to provide  such  notice)  and (ii)  unless in such
indemnified  party's  reasonable  judgment a conflict of interest  between  such
indemnified  and  indemnifying  parties  may exist with  respect to such  claim,
permit such indemnifying  party to assume the defense of such claim with counsel
reasonably  satisfactory to the indemnified  party. An indemnifying party who is

                                       9
<PAGE>

not  entitled  to, or elects not to,  assume the  defense of a claim will not be
obligated  to pay the fees and expenses of more than one counsel for all parties
indemnified by such indemnifying party with respect to such claim, unless in the
reasonable  judgment of any  indemnified  party a conflict of interest may exist
between such indemnified  party and any other of such  indemnified  parties with
respect to such claim.

               (d) The  indemnifying  party shall not be liable to  indemnify an
indemnified party for any settlement,  or consent to judgment of any such action
effected without the indemnifying  party's consent (but such consent will not be
unreasonably  withheld).  Furthermore,  the indemnifying party shall not, except
with  the  approval  of each  indemnified  party,  consent  to the  entry of any
judgment or enter into any settlement which does not include as an unconditional
term thereof the giving by the claimant or plaintiff to each  indemnified  party
of a release from all liability in respect to such claim or  litigation  without
any payment or consideration provided by each such indemnified party.

               (e) If the  indemnification  provided  for in this  Section  7 is
unavailable to an  indemnified  party under clauses (a) and (b) above in respect
of any losses,  claims,  damages or liabilities  referred to therein,  then each
indemnifying  party,  in lieu of  indemnifying  such  indemnified  party,  shall
contribute to the amount paid or payable by such  indemnified  party as a result
of  such  losses,  claims,  damages  or  liabilities  in such  proportion  as is
appropriate to reflect not only the relative  benefits  received by the Company,
the underwriter(s),  the sellers of Registrable Securities and any other sellers
participating in the registration  statement from the sale of shares pursuant to
the registered  offering of securities to which indemnity is sought but also the
relative fault of the Company,  the  underwriter(s),  the sellers of Registrable
Securities and any other sellers participating in the registration  statement in
connection  with the  statement  or  omissions  which  resulted in such  losses,
claims,  damages  or  liabilities,  as  well  as any  other  relevant  equitable
considerations.   The   relative   benefits   received  by  the   Company,   the
underwriter(s),  the sellers of  Registrable  Securities  and any other  sellers
participating in the  registration  statement shall be deemed to be based on the
relative  relationship  of the  total net  proceeds  from the  offering  (before
deducting expenses) to the Company, the total underwriting  commissions and fees
from the offering  (before  deducting  expenses) to the  underwriter(s)  and the
total net proceeds from the offering (before deducting  expenses) to the sellers
of  Registrable   Securities  and  any  other  sellers   participating   in  the
registration  statement.  The relative fault of the Company, the underwriter(s),
the sellers of Registrable Securities and any other sellers participating in the
registration  statement shall be determined by reference to, among other things,
whether  the  untrue or  alleged  untrue  statement  of a  material  fact or the
omission or alleged  omission to state a material  fact  relates to  information
supplied by the Company or by registration  statement and the parties'  relative
intent,  knowledge,  access to information and opportunity to correct or prevent
such statement or omission.

               (f) The  indemnification  provided for under this  Agreement will
remain in full force and effect  regardless of any  investigation  made by or on
behalf of the indemnified party or any


                                       10
<PAGE>

officer,  director  or  controlling  person of such  indemnified  party and will
survive the transfer of securities.

         8.   Participation  in  Underwritten   Registrations.   No  Person  may
participate in any  registration  hereunder  which is  underwritten  unless such
Person (a) agrees to sell such Person's  securities on the basis provided in any
underwriting  arrangements  approved by the Person or Persons entitled hereunder
to approve such  arrangements,  (b) as  expeditiously  as possible  notifies the
Company  of the  occurrence  of any event as a result of which  such  prospectus
contains an untrue  statement of material fact or omits to state a material fact
required to be stated  therein or necessary to make the  statements  therein not
misleading  and  (c)  completes  and  executes  all  questionnaires,  powers  of
attorney,  indemnities,  underwriting  agreements and other documents reasonably
required under the terms of such underwriting arrangements.

         9. Transfer of  Registration  Rights.  The rights granted to any Person
under this  Agreement  may be assigned to a transferee or assignee in connection
with any transfer or assignment of Registrable Securities by a Holder; provided,
that: (a) such transfer may otherwise be effected in accordance  with applicable
securities  laws, (b) if not already a party hereto,  the assignee or transferee
agrees in writing prior to such  transfer to be bound by the  provisions of this
Agreement   applicable  to  the  transferor,   (c)  such  transferee  shall  own
Registrable  Securities  representing  at least  250,000  shares of Common Stock
(subject to the anti-dilution  adjustments contained in the Purchase Agreement),
and (d) EIS shall act as agent and representative for such Holder for the giving
and receiving of notices  hereunder.  In the event that such  assignment  occurs
subsequent  to the  date of  effectiveness  of a  Registration  Statement  filed
pursuant to this Agreement, the transferee agrees to pay all reasonable expenses
necessary to amend or  supplement  such  Registration  Statement to reflect such
assignment.

         10.  Information by Holder.  Each Holder shall furnish the Company such
written information  regarding such Holder and any distribution proposed by such
Holder  as the  Company  may  reasonably  request  in  writing  and as  shall be
reasonably  required  in  connection  with  any  registration  qualification  or
compliance referred to in this Agreement.

         11. Exchange Act  Compliance.  The Company shall comply with all of the
reporting  requirements  of the 1934 Act  applicable to it and shall comply with
all other public information reporting  requirements of the Commission which are
conditions  to the  availability  of Rule  144 for the  sale of the  Registrable
Securities.  The Company shall  cooperate  with each Purchaser in supplying such
information  as may be  necessary  for such  Purchaser  to complete and file any
information reporting forms presently or hereafter required by the Commission as
a condition to the availability of Rule 144.


                                       11

<PAGE>
         12.  Limitation  on  Registration.   Notwithstanding  anything  to  the
contrary in this  Agreement,  the  Company  shall not be  obligated  to effect a
registration of any Holder's Registrable  Securities pursuant to Sections 2 or 3
hereof if all of the  Registrable  Securities  have been  sold  under  Rule 144,
Regulation S or similar  provision  under the Securities Act so that there is no
further restriction on the transfer by the transferee or if the Holders may sell
the Registrable Securities without restriction pursuant to Rule 144(k) under the
Securities Act (or any successor statute thereto).

         13. Miscellaneous. (a) No Inconsistent Agreements. The Company will not
hereafter  enter into any  agreement  with  respect to its  securities  which is
inconsistent  with or violates the rights  granted to the Holders of Registrable
Securities in this Agreement.

               (b)  Remedies.  Any Person  having  rights under any provision of
this Agreement will be entitled to enforce such rights  specifically  to recover
damages caused by reason of any breach of any provision of this Agreement and to
exercise  all  other  rights  granted  by law.  The  parties  hereto  agree  and
acknowledge  that money damages may not be an adequate  remedy for any breach of
the provisions of this  Agreement and that any party may in its sole  discretion
apply to any court of law or equity of competent  jurisdiction  (without posting
any bond or other security) for specific  performance  and for other  injunctive
relief in order to  enforce  or  prevent  violation  of the  provisions  of this
Agreement.

               (c) Amendments and Waivers.  Except as otherwise provided herein,
the  provisions  of this  Agreement may be amended or waived only upon the prior
written  consent of the Company  and Holders of at least 50% of the  Registrable
Securities; provided, that without the prior written consent of all the Holders,
no such amendment or waiver shall reduce the foregoing percentage.

               (d) Successors and Assigns.  All covenants and agreements in this
Agreement  by or on behalf of any of the  parties  hereto will bind and inure to
the benefit of the  respective  successors  and  assigns of the  parties  hereto
whether so expressed or not. In addition,  whether or not any express assignment
has been made,  the  provisions of this  Agreement  which are for the benefit of
Holders of Registrable  Securities are also for the benefit of, and  enforceable
by, any subsequent holder of Registrable Securities.

               (e)  Severability.  Whenever  possible,  each  provision  of this
Agreement  will be interpreted in such manner as to be effective and valid under
applicable  law, but if any provision of this Agreement is held to be prohibited
by or invalid under  applicable law, such provision will be ineffective  only to
the extent of such prohibition or invalidity, without invalidating the remainder
of this Agreement.

               (f) Counterparts.  This Agreement may be executed  simultaneously
in two or more counterparts, any one of which need not contain the signatures of
more than one party,  but all such  counterparts  taken together will constitute
one and the same Agreement.

                                       12

<PAGE>

               (g)  Descriptive  Headings.  The  descriptive  headings  of  this
Agreement are inserted for convenience only and do not constitute a part of this
Agreement.

               (h) Governing  Law. All questions  concerning  the  construction,
validity and  interpretation  of this  Agreement  and the exhibits and schedules
hereto will be governed by the internal  law, and not the law of  conflicts,  of
New York. Each of the Parties hereby irrevocably  submits to the jurisdiction of
any New York State or United States  Federal  court sitting in the county,  city
and state of New York over any action or  proceeding  arising out of or relating
to this  Agreement  or the  Transaction  Documents;  and each hereby  waives the
defense of an inconvenient forum for the maintenance of such an action.

               (i) Notices.  All notices,  demands or other communications to be
given or delivered  under or by reason of the provisions of this Agreement shall
be in writing and shall be deemed to have been given when  delivered  personally
or by hand to the  recipient,  one day after being sent to the  recipient  by an
internationally recognized overnight delivery service (charges prepaid) or three
days after being mailed to the recipient by certified or registered mail, return
receipt  requested  and  postage  prepaid.  Such  notices,   demands  and  other
communications  will be sent to the parties hereto at the addresses indicated on
the signature page hereto and to the Company at the address indicated below:

                                   Sheffield Pharmaceuticals, Inc.
                                   South Winton Court
                                   3136 Winton Road South
                                   Suite 306
                                   Rochester, New York 14623
                                   Attention:  Chairman

                 and

                                   Sheffield Pharmaceuticals, Inc.
                                   425 South Woodsmill Road
                                   St. Louis, Missouri  63017-3441
                                   Attention:  Chief Executive Officer

               (j) Termination. This Agreement shall terminate on the date as of
which each Holder has sold all remaining Registrable Securities in a transaction
or transactions of the type described in Section 12 hereof.


                                       13
<PAGE>


               IN WITNESS WHEREOF,  the parties have executed this  Registration
Rights Agreement as of the date first written above.


                                      Sheffield Pharmaceuticals, Inc.


                                      By:/s/
                                         ---------------------------------------
                                         Name:
                                         Title:



                                      Elan International Services, Ltd.



                                      By:/s/
                                         ---------------------------------------
                                         Name:
                                         Title:


                                      102 St. James Court
                                      Flatts, Smiths Parish
                                      Bermuda, FL04
                                      Attention: Director
                                      Facsimile: (441) 292-2224


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