SHEFFIELD PHARMACEUTICALS INC
S-3, 1997-10-21
PHARMACEUTICAL PREPARATIONS
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    As filed with the Securities and Exchange Commission on October 21, 1997
                                                Registration No. 333-
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                              --------------------
                             REGISTRATION STATEMENT
                                   ON FORM S-3
                                      UNDER
                           THE SECURITIES ACT OF 1933
                              --------------------
                         SHEFFIELD PHARMACEUTICALS, INC.
- --------------------------------------------------------------------------------
             (Exact Name of Registrant as Specified in its Charter)

                                    Delaware
- --------------------------------------------------------------------------------
         (State or Other Jurisdiction of Incorporation or Organization)

                                   13-3808303
- --------------------------------------------------------------------------------
                      (I.R.S. Employer Identification No.)


                       425 South Woodsmill Road, Suite 270
                            St. Louis, Missouri 63017
                                 (314) 579-9899
- --------------------------------------------------------------------------------
               (Address, Including Zip Code and Telephone Number,
        Including Area Code, of Registrant's Principal Executive Offices)
                              --------------------
                                Loren G. Peterson
                             Chief Executive Officer
                         Sheffield Pharmaceuticals, Inc.
                       425 South Woodsmill Road, Suite 270
                            St. Louis, Missouri 63017
                                 (314) 579-9899
- --------------------------------------------------------------------------------
            (Name, Address, Including Zip Code and Telephone Number,
                   Including Area Code, of Agent For Service)

                                    COPY TO:
                            Daniel J. Gallagher, Esq.
                     OLSHAN GRUNDMAN FROME & ROSENZWEIG LLP
                                 505 Park Avenue
                            New York, New York 10022
                                 (212) 753-7200

         APPROXIMATE  DATE OF  COMMENCEMENT  OF PROPOSED SALE TO THE PUBLIC:  As
soon as practicable after this Registration Statement becomes effective.

         If the only securities  being registered on this form are being offered
pursuant to dividend or interest  reinvestment plans, please check the following
box. / /

         If any of the  securities  being  registered  on  this  Form  are to be
offered  on a  delayed  or  continuous  basis  pursuant  to Rule 415  under  the
Securities Act of 1933,  other than  securities  offered only in connection with
dividend or interest reinvestment plans, check the following box. /X/


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


                                                        (CONTINUED ON NEXT PAGE)

<PAGE>
<TABLE>
<CAPTION>

                         CALCULATION OF REGISTRATION FEE

==================================================================================================================================
                                                                              Proposed
                                                                               Maximum            Proposed
                                                                              Offering            Maximum           Amount of
Title of Each Class of                               Amount to be             Price Per          Aggregate         Registration
Securities to be Registered*                          Registered                Share          Offering Price          Fee
- ----------------------------------------------------------------------------------------------------------------------------------
<S>                                              <C>                             <C>               <C>                  <C>
Common Stock, $.01 par value issuable            2,333,334 shares(1)(2)          $2.22(3)          $5,180,001(3)        $1,570
upon conversion of 6% Convertible
Subordinated Debentures Due 2000............
- ----------------------------------------------------------------------------------------------------------------------------------
Common Stock, $.01 par value, issuable             140,000 shares(1)             $2.80(4)            $392,000(4)          $119
upon exercise of Warrants granted to
holders of 6% Convertible Subordinated
Debentures Due 2000.........................
- ----------------------------------------------------------------------------------------------------------------------------------
Common Stock, $.01 par value issuable              420,000 shares(2)             $2.22(3)            $932,400(3)          $283
in lieu of cash interest on 6%
Convertible Subordinated Debentures
Due 2000....................................
- ----------------------------------------------------------------------------------------------------------------------------------
Total                                                                                              $6,504,401           $1,972
==================================================================================================================================
</TABLE>

*  The expenses of the offering described in this registration statement, all of
   which are payable by the Company, are estimated at $105,000.

(1)     Pursuant to Rule 416, there are also registered  hereby an indeterminate
        number of shares of Common  Stock that may become  issuable by reason of
        the anti-dilution provisions of these securities, warrants or options.
(2)     Pursuant to Rule 416, there are also registered  hereby an indeterminate
        number of  shares  of  Common  Stock  issuable  upon  conversion  of the
        Registrant's  6% Convertible  Subordinated  Debentures Due September 22,
        2000 and in lieu of cash interest thereon resulting from the fluctuating
        conversion  rate  of  the 6%  Convertible  Subordinated  Debentures  Due
        September 22, 2000 that is determined based upon the market price of the
        Company's  publicly-traded Common Stock as of the date of the applicable
        conversion thereof.
(3)     Estimated  solely for the purpose of calculating  the  registration  fee
        pursuant to Rule 457(c)  based on the average of the high and low prices
        of the  Registrant's  Common  Stock as  reported on the  American  Stock
        Exchange on October 16, 1997.
(4)     Based upon $2.80 per share exercise price of these Warrants.

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

        THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER  AMENDMENT  WHICH  SPECIFICALLY  STATES  THAT  THIS  REGISTRATION
STATEMENT SHALL  THEREAFTER  BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE  SECURITIES  ACT OF 1933, AS AMENDED,  OR UNTIL THE  REGISTRATION  STATEMENT
SHALL BECOME  EFFECTIVE ON SUCH DATE AS THE SECURITIES AND EXCHANGE  COMMISSION,
ACTING PURSUANT TO SAID SECTION 8(A), MAY DETERMINE.

                                      -ii-

<PAGE>
INFORMATION   CONTAINED  HEREIN  IS  SUBJECT  TO  COMPLETION  OR  AMENDMENT.   A
REGISTRATION  STATEMENT  RELATING  TO THESE  SECURITIES  HAS BEEN FILED WITH THE
SECURITIES  AND EXCHANGE  COMMISSION.  THESE  SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION  STATEMENT  BECOMES
EFFECTIVE.  THIS  PROSPECTUS  SHALL  NOT  CONSTITUTE  AN  OFFER  TO  SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE  SECURITIES
IN ANY STATE IN WHICH SUCH OFFER,  SOLICITATION  OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.

                  SUBJECT TO COMPLETION, DATED OCTOBER 21, 1997

         PROSPECTUS

                         SHEFFIELD PHARMACEUTICALS, INC.

                        2,893,334 SHARES OF COMMON STOCK

         This  Prospectus  relates to the offer and  resale by  certain  selling
stockholders (collectively,  the "Selling Stockholders") of (i) 2,333,334 shares
(the  "Debenture  Conversion  Shares") of common stock,  $.01 par value ("Common
Stock"),  of Sheffield  Pharmaceuticals,  Inc.  (the  "Company")  issuable  upon
conversion of the Company's 6% Convertible Subordinated Debentures Due September
22, 2000 (the  "Convertible  Debentures"),  (ii) 420,000  shares of Common Stock
issuable as interest payable in lieu of cash interest on Convertible  Debentures
and (iii) 140,000  shares of Common Stock  issuable upon the exercise of certain
stock purchase  warrants of the Company  originally  issued to the purchasers of
Convertible Debentures (the "Debenture Warrants"). This Prospectus also relates,
pursuant to Rule 416  promulgated  under the  Securities Act of 1933, as amended
(the "Securities Act"), to the offer and resale by certain Selling  Stockholders
of an indeterminate number of shares of Common Stock that may become issuable by
reason of the anti-dilution  provisions of the aforementioned  securities and an
indeterminate  number of shares of Common  Stock  issuable  upon  conversion  of
Convertible  Debentures and in lieu of cash interest  payable thereon  resulting
from the  fluctuating  conversion  rate of the  Convertible  Debentures  that is
determined based upon the market price of the Company's  publicly-traded  Common
Stock as of the date of the applicable  conversion thereof.  See "Description of
Securities - 6% Convertible Subordinated Debentures."

         The Common Stock  presently  trades on the American Stock Exchange (the
"AMEX") under the symbol "SHM".  On October 20, 1997,  the closing sale price of
the Common Stock on the AMEX was $2.19.

         The Selling Stockholders,  directly or through broker-dealers, may sell
the Common  Stock  offered  hereby from time to time on the AMEX or on any other
securities  exchange on which Common Stock is listed or in privately  negotiated
transactions,  at fixed prices that may be changed,  at market prices prevailing
at the time of sale, at prices  related to such  prevailing  market prices or at
privately  negotiated  prices.  The Selling  Stockholders and any  underwriters,
brokers, dealers or agents that act in connection with the sale may be deemed to
be  "underwriters"  within the meaning of the Securities Act and any commissions
received by them and any profit on the resale of securities  as principal  might
be deemed to be underwriting discounts under the Securities Act. The Company has
agreed to indemnify the Selling  Stockholders  and certain other persons against
certain liabilities,  including  liabilities under the Securities Act. See "Plan
of Distribution."


          THE SECURITIES OFFERED HEREBY INVOLVE A HIGH DEGREE OF RISK.
            THE COMPANY EXPECTS TO INCUR ADDITIONAL OPERATING LOSSES
              OVER THE NEXT SEVERAL YEARS WHICH RAISES SUBSTANTIAL
                    DOUBT ABOUT ITS ABILITY TO CONTINUE AS A
            GOING CONCERN. SEE "RISK FACTORS" AT PAGES 9 - 14 BELOW.
                      -----------------------------------

          THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
           SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
            COMMISSION NOR HAS THE COMMISSION OR ANY STATE SECURITIES
             COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
                 PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY
                             IS A CRIMINAL OFFENSE.


<PAGE>

         No underwriting commissions or discounts will be paid by the Company in
connection  with this  offering.  Estimated  expenses  payable by the Company in
connection with the offering are $105,000. The aggregate proceeds to the Selling
Stockholders from the sale of the Common Stock will be the purchase price of the
Common  Stock sold less the  aggregate  agents'  commissions  and  underwriters'
discounts,  if any, and other expenses of issuance and distribution not borne by
the Company. See "Plan of Distribution."

         No person has been  authorized to give any  information  or to make any
representations  in connection  with this offering other than those contained in
this   Prospectus   and,  if  given  or  made,   such  other   information   and
representations  must  not be  relied  upon as  having  been  authorized  by the
Company.  Neither the delivery of this  Prospectus  nor any sale made  hereunder
shall,  under any  circumstances,  create any implication that there has been no
change  in the  affairs  of the  Company  since  the  date  hereof  or that  the
information  contained  herein is correct as of any time subsequent to its date.
This  Prospectus  does not constitute an offer to sell or a  solicitation  of an
offer to buy any  securities  other than the  registered  securities to which it
relates.  This Prospectus does not constitute an offer to buy such securities in
any circumstances in which such offer or solicitation is unlawful.


                  The date of this Prospectus is _______, 1997.

                                       -2-

<PAGE>

                                TABLE OF CONTENTS


                                                                            PAGE
                                                                            ----

AVAILABLE INFORMATION.........................................................4

INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE...............................4

THE COMPANY...................................................................6

RISK FACTORS..................................................................9

USE OF PROCEEDS..............................................................14

DIVIDEND POLICY..............................................................14

RECENT DEVELOPMENTS..........................................................15

SELLING STOCKHOLDERS.........................................................16

DESCRIPTION OF SECURITIES....................................................17

PLAN OF DISTRIBUTION.........................................................18

LEGAL MATTERS................................................................19

EXPERTS  ....................................................................19

ADDITIONAL INFORMATION.......................................................20


                                       -3-

<PAGE>

                              AVAILABLE INFORMATION

         The  Company  is  subject  to  the  informational  requirements  of the
Securities  Exchange  Act of 1934,  as  amended  (the  "Exchange  Act"),  and in
accordance therewith files reports,  proxy statements and other information with
the Securities and Exchange Commission (the "Commission").  Such reports,  proxy
statements  and other  information  can be  inspected  and  copied at the public
reference facilities maintained by the Commission at Room 1024, Judiciary Plaza,
450 Fifth Street,  N.W.,  Washington,  D.C. 20549 and at the Regional Offices of
the Commission at Seven World Trade Center, 13th Floor, New York, New York 10048
and  Northwestern  Atrium Center,  500 West Madison  Street,  Chicago,  Illinois
60611. Copies of such material can be obtained from the Public Reference Section
of the Commission at Judiciary Plaza, 450 Fifth Street, N.W.,  Washington,  D.C.
20549, at prescribed rates. Such material may also be accessed electronically by
means of the Commission's  home page on the Internet at  http://www.sec.gov.  In
addition, reports, proxy statements and other information concerning the Company
can be inspected and copied at the offices of the AMEX at 86 Trinity Place,  New
York,  New York  10006,  on which the Common  Stock of the Company is listed for
trading (Symbol: SHM).

         The Company has filed with the  Securities  and  Exchange  Commission a
Registration  Statement on Form S-3 under the Securities Act with respect to the
Common Stock offered hereby. For further information with respect to the Company
and the  securities  offered  hereby,  reference  is  made  to the  Registration
Statement.  Statements  contained in this  Prospectus  as to the contents of any
contract or other document are not necessarily  complete,  and in each instance,
reference is made to the copy of such  contract or document  filed as an exhibit
to the  Registration  Statement,  each such  statement  being  qualified  in all
respects by such reference.

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

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

         The  Company   incorporates   by  reference  the  following   documents
heretofore filed with the Commission pursuant to the Exchange Act:

                  (a)      Annual  Report of the  Company on Form 10-KSB for the
                           fiscal year ended  December 31,  1996,  as amended by
                           Amendment  Nos. 1 and 2 filed with the  Commission on
                           April 16, 1997 and July 30, 1997, respectively.

                  (b)      Quarterly  Report of the Company on Form 10-Q for the
                           quarterly  period  ended March 31, 1997 as filed with
                           the  Commission,  as amended by Amendment No. 1 filed
                           with the Commission on July 31, 1997.

                  (c)      Quarterly  Report of the Company on Form 10-Q for the
                           quarterly  period  ended June 30,  1997 as filed with
                           the Commission.

                  (d)      The description of the Common Stock and other matters
                           set forth in the Company's  Registration Statement on
                           Form 8-B filed with the Commission on July 7, 1995.

         All documents  filed by the Company  after the date of this  Prospectus
pursuant to Section 13(a),  13(c), 14 or 15(d) of the Exchange Act, prior to the
termination of this offering, are deemed to be incorporated by reference in this
Prospectus  and shall be deemed to be a part  hereof  from the date of filing of
such documents.  Any statement contained in a document incorporated by reference
in this Prospectus  shall be deemed to be modified or superseded for purposes of
this Prospectus to the extent that a statement contained herein (or in any other
subsequently  filed  document  which is also  incorporated  by reference in this
Prospectus) modifies or supersedes such statement.  Any statement so modified or
superseded  shall  not be  deemed,  except  as so  modified  or  superseded,  to
constitute a part of this Prospectus.

                                       -4-

<PAGE>
         The Company hereby  undertakes to provide without charge to each person
to whom a copy of this  Prospectus  has been  delivered,  on the written or oral
request of any such person,  a copy of any or all of the  documents  referred to
above which have been or may be  incorporated  in this  Prospectus by reference,
other than exhibits to such documents.  Written  requests for such copies should
be directed to Sheffield Pharmaceuticals,  Inc., 425 South Woodsmill Road, Suite
270, St. Louis, Missouri 63017,  Attention:  Loren G. Peterson,  Chief Executive
Officer. Oral requests should be directed to Mr. Peterson at (314) 579-9899.

                                       -5-

<PAGE>
                                   THE COMPANY

         The Company is engaged in the  development of proprietary  prescription
pharmaceutical  products  targeted at patient  markets with unmet  medical needs
over a range of  therapeutic  areas.  The  Company's  strategy  is to focus  its
resources on later stage projects that have a more rapid and predictable path to
marketing approval. The Company's objective is to be a specialty  pharmaceutical
company that develops and markets its own  proprietary  products.  The principal
elements of the Company's  business  strategy consist of the following:  (i) the
acquisition of opportunities with unrealized  commercial  potential that address
unmet medical needs and require only later stage development prior to regulatory
approval;  (ii) a focus  initially  on  segments of the large,  rapidly  growing
respiratory market,  which includes certain chronic diseases requiring long-term
therapy; (iii) the development of proprietary formulations of currently approved
pharmaceutical  compounds,  which can reduce  regulatory and  development  risks
typically  associated  with the development of new chemical  entities;  (iv) the
management of the clinical  development and regulatory  approval of its products
that will be performed by clinical research  organizations or organizations with
similar development capabilities; (v) the contracting for the manufacture of its
products  by  pharmaceutical  manufacturers  with a history  of  producing  cost
effective,  high quality,  U.S. Food and Drug  Administration  ("FDA") compliant
products;  and (vi) the marketing of its products directly through the Company's
specialty sales force that will be built at such time as opportunities warrant.

         As of the date of this  Prospectus,  the Company has  acquired  certain
development and marketing rights in the following technologies:

         MULTI-DOSE INHALER (MSI). The Company holds exclusive worldwide license
rights to a  multi-dose  inhaler  of  Siemens  AG (the "MSI  Inhaler").  The MSI
Inhaler is a drug delivery system that allows for the  administration of a range
of drugs to the lungs for  asthma,  chronic  obstructive  pulmonary  disease and
other respiratory diseases.  In addition,  the MSI Inhaler's delivery system may
find  application  in the  treatment of  non-respiratory  illnesses  that may be
treated by drug  deliveries  to the lungs.  The  Company  plans to develop  drug
formulations for use with the MSI Inhaler.

         ION  PHARMACEUTICALS,  INC.  TECHNOLOGIES.  The  Company,  through  Ion
Pharmaceuticals,  a Delaware  corporation  and a wholly-owned  subsidiary of the
Company ("Ion"),  holds exclusive  worldwide license rights to certain compounds
and their uses for the treatment of conditions characterized by unregulated cell
proliferation  or cell  growth and sickle cell  anemia  (collectively,  the "Ion
Pharmaceuticals  Technologies").  Ion's intellectual property portfolio consists
of  clotrimazole,  its  metabolites,  and a number of  proprietary  new chemical
entities   co-owned  by  Ion  termed  the   Trifens(TM).   Such  compounds  have
demonstrated  promise  in  therapeutic  applications  for  treating  a number of
conditions  characterized  by  unregulated  cell  proliferation,  such as cancer
(including   multiple  drug   resistant   cancer)  and  certain   dermatological
conditions, as well as sickle cell anemia and secretory diarrhea.

         RBC-CD4  ELECTROINSERTION  TECHNOLOGY.  The  Company  is the  worldwide
licensee  of certain  technology  (the  "RBC-CD4  Electroinsertion  Technology")
relating to the  electroinsertion  of full-length CD4 protein into the red blood
cell membrane ("RBC-CD4") for use as a therapeutic in the treatment of the human
immunodeficiency virus ("HIV") that leads to Acquired Immune Deficiency Syndrome
("AIDS").  The electroinsertion  process inserts CD4, the protein that serves as
the binding  site of the HIV virus,  into red blood  cells.  This  altered  cell
complex  acts as a decoy and is designed to cleanse  the blood of  infection  by
binding  to and  removing  the HIV virus from  circulation  before it can infect
other cells in the human immune  system.  The related Phase I/IIA clinical trial
was conducted by The Johns Hopkins University Medical Center.


                                       -6-

<PAGE>
         LIPOSOME-CD4  TECHNOLOGY.  The  Company is the  worldwide  licensee  of
certain technology (the "Liposome-CD4 Technology") relating to the incorporation
of CD4 antigens into liposome  bilayers and their use as a therapeutic  agent in
the  treatment of HIV and AIDS.  While  RBC-CD4  Electroinsertion  Technology is
being  developed  by the  Company  to target HIV and  HIV-infected  cells in the
blood,  Liposome-CD4  Technology is being  developed by the Company's  exclusive
sublicensee, Sequus Pharmaceuticals, to target infections in the human lymphatic
system, a major reservoir for infection not reached by blood circulation.

         HIV/AIDS VACCINE. The Company holds an exclusive worldwide license to a
potential  HIV/AIDS  vaccine and diagnostic  developed by Professor  Jean-Claude
Chermann,  one of the original Pasteur Institute discoverers of HIV. The vaccine
concept  developed by  Professor  Chermann  utilizes a cellular  antigen that is
incorporated into the membrane surface of HIV after the HIV virus has reproduced
buds from infected cells.  This cellular  antigen does not appear to vary across
the  various  strains  of the virus and may  provide a stable  target to develop
antibodies that can prevent  infection.  The Company  believes this approach may
also  protect  against  both  blood-born  and sexual  transmission  of HIV.  The
Company's  goal is to develop an oral  formulation  that would make the  vaccine
potentially less costly and easier to distribute to a broad population.

         UGIF TECHNOLOGY.  The Company holds an exclusive worldwide license to a
potential  prostate  cancer  therapy.   The  related  technology  focuses  on  a
urogenital sinus derived growth inhibitory factor that may inhibit the growth of
transformed  cells and tumors in the human  prostate.  The related  research has
been conducted by scientific and medical  investigators  affiliated  with Baylor
College of Medicine and headed by Dr. David R. Rowley.

         MEMBRANE ATTACK COMPLEX (MAC)/COMPLEMENT  TECHNOLOGY. The Company holds
exclusive   worldwide   license  rights  to  certain   membrane  attack  complex
(MAC)/complement   technology   relating  to  the  loading  of  therapeutic  and
diagnostic molecules into cells. Through the use of certain complement proteins,
pores or channels  can be formed in various cell  membranes,  allowing a pathway
for the entry of molecules  of various  sizes into such cells.  This  technology
could provide for the selective  delivery of various  therapeutic and diagnostic
agents to target,  I.E., cancer cells or viruses.  The related research has been
conducted  by  scientific  and medical  investigators  affiliated  with  Harvard
Medical School and headed by Dr. Jose Halperin.

         The  Company's  research and  development  of its  technologies  are at
various stages of progress. The Company's research and development activities to
date  have  not  resulted  in  a  commercial  product.  Most  of  the  Company's
technologies  are at early stages of research and  development  and are at least
several  years  away from  receiving  FDA  approval  or from  commercialization.
Management  currently  believes its MSI Inhaler will be its first  technology to
receive FDA approval,  which  approval is currently  estimated to be received in
approximately three to four years.  However,  there can be no assurance that any
of the Company's  technologies  will receive final approval from the FDA or will
result in a commercialized product.

         The  table  below  indicates  (i) the  Company's  direct  research  and
development  expenses by project for the six months ended June 30, 1997, for the
fiscal year ended December 31, 1996 and from the Company's inception to June 30,
1997,  (ii) the  Company's  current  estimate  by  project of  committed  and/or
anticipated funding requirements after June 30, 1997 and (iii) revenues received
to date by project.

                                      -7-

<PAGE>
                         DIRECT RESEARCH AND DEVELOPMENT
                                    EXPENSES
                                  (IN DOLLARS)

<TABLE>
<CAPTION>
                                                                                     COMMITTED
                                  SIX             FISCAL                              AND/OR
                                MONTHS             YEAR                            ANTICIPATED
                                 ENDED             ENDED        INCEPTION TO        R&D FUNDING             REVENUE
         R&D PROJECT            6/30/97          12/31/96         6/30/97          AFTER 6/30/97*           RECEIVED
- --------------------------     ---------        ----------      ------------     ----------------         ----------
<S>                             <C>               <C>              <C>                <C>                      <C>
Multi-Dose Inhaler (MSI)        171,201           144,409          1,445,926          15,256,074              -0-
Ion Pharmaceuticals,            267,016         2,097,020          4,599,183             313,742           10,000
  Inc. Technologies
RBC-CD4 Electroinsertion          6,736           515,036          6,254,185                 -0-              -0-
 Technology
Liposome-CD4 Technology             -0-            60,449          2,322,322                 -0-          500,000
HIV/AIDS Vaccine                100,000           414,849          1,199,118             150,000              -0-
UGIF Technology                  60,018            16,398            163,419              60,000              -0-
Membrane Attack Complex          60,936           121,874            304,682              60,936              -0-
 (MAC)/Complement
  Technology
</TABLE>
- ------------------
*        These amounts  constitute  management's  estimate of anticipated direct
         R&D expenses as of the date of this Prospectus. The amounts and rate of
         application  of the  Company's  funds  to any  particular  project  are
         expected  to  fluctuate  and  will  depend  in  part  on the  Company's
         successful  completion of various stages of research,  the availability
         of  additional   financing  and  the   Company's   identification   and
         acquisition of rights in new technologies in the future.

         The  Company is a party to  license  agreements  pursuant  to which the
Company has obtained worldwide  exclusive licenses to its technologies.  Each of
these license agreements  require the Company to pay the licensors  royalties on
proceeds received by the Company from the commercialization of related products.
The  royalty  rates  payable  by the  Company  under  these  license  agreements
generally range from 3.75% to 50% of gross compensation  received by the Company
in respect of related  commercialized  product.  These license  agreements  also
require the Company to develop the related  technology and grant the Company the
right, under certain circumstances,  to sublicense the related technologies.  In
addition,  the  Company  is  a  party  to a  sublicense  agreement  with  Sequus
Pharmaceuticals,  Inc.  ("Sequus")  pursuant  to which the  Company  has granted
Sequus an exclusive  sublicense to develop and  commercialize  its Liposome CD-4
Technology.  The  sublicense  agreement  requires  Sequus  to  pay  the  Company
royalties in varying  amounts on proceeds  received by Sequus in connection with
commercialization  of the related  technology by Sequus.  The amount of interest
that the Company  will  maintain in a particular  technology  is a factor of the
amount of net income retained by the Company after payment of royalties  payable
by the Company to the related  technology  licensor and any related  third party
contractors (E.G., research institutions or private companies) and the amount of
royalties received by the Company from any sublicensees of the technology, which
retained amount of interest will vary among each of the Company's technologies.

         The  Company  was  organized  under  Canadian  law in  October  1986 as
Sheffield Strategic Metals, Inc. The Company commenced  operations in the United
States in January 1992. Effective May 19, 1992, Sheffield Pharmaceuticals,  Inc.
became domesticated as a Wyoming corporation without reincorporation pursuant to
a "continuance"  procedure under Wyoming  corporation law. On June 13, 1995, the
Company changed its state of incorporation to Delaware by means of a merger with
and into a newly-formed  wholly-owned  Delaware subsidiary of the Company.  Such
merger and the  resulting  change of the  Company's  state of  incorporation  to
Delaware was approved by the Company's stockholders in January 1995. The Company
changed its name from "Sheffield Medical Technologies Inc." to "Sheffield

                                       -8-

<PAGE>

Pharmaceuticals,  Inc."  effective June 27, 1997.  Unless the context  otherwise
indicates, the "Company" as used herein means Sheffield  Pharmaceuticals,  Inc.,
its predecessors and its wholly-owned  subsidiaries Ion and CP  Pharmaceuticals,
Inc.

         The Company's  headquarters  are located at 425 South  Woodsmill  Road,
Suite 270, St. Louis, Missouri 63017 and its telephone number is (314) 579-9899.


                                  RISK FACTORS

         THE SECURITIES  OFFERED HEREBY ARE HIGHLY  SPECULATIVE  AND PROSPECTIVE
PURCHASERS SHOULD BE AWARE THAT THE PURCHASE OF SUCH SECURITIES  INVOLVES A HIGH
DEGREE  OF RISK.  IN  ADDITION  TO OTHER  INFORMATION  IN THIS  PROSPECTUS,  THE
FOLLOWING  FACTORS  SHOULD BE  CONSIDERED  CAREFULLY IN  EVALUATING  THE COMPANY
BEFORE  PURCHASING THE  SECURITIES  OFFERED  HEREBY.  THIS  PROSPECTUS  CONTAINS
FORWARD- LOOKING STATEMENTS WHICH INVOLVE RISKS AND UNCERTAINTIES. THE COMPANY'S
ACTUAL  RESULTS  COULD  DIFFER   MATERIALLY  FROM  THOSE  ANTICIPATED  IN  THESE
FORWARD-LOOKING  STATEMENTS AS A RESULT OF CERTAIN FACTORS,  INCLUDING THOSE SET
FORTH IN THE FOLLOWING RISK FACTORS AND ELSEWHERE IN THIS PROSPECTUS.

DEVELOPMENT STAGE COMPANY; HISTORY OF OPERATING LOSSES AND ACCUMULATED DEFICIT;
GOING CONCERN OPINION

         The Company is in the  development  stage.  The Company  commenced  its
biotechnology  operations  in the  United  States  in  January  1992  through  a
wholly-owned  subsidiary to acquire,  develop and commercialize what it believed
to be promising medical  technologies.  On January 10, 1996, Ion was formed as a
wholly-owned subsidiary of the Company. At that time, Ion acquired the Company's
rights to the  Company's  anti-proliferative  technology.  The  Company has been
principally  engaged to date in research funding and licensing efforts,  and has
experienced  significant  operating losses.  The Company  experienced  operating
losses of $7,008,889  and $6,089,487 for the fiscal year ended December 31, 1996
and for the six months  ended June 30,  1997,  respectively,  and as of June 30,
1997, the Company had an accumulated  deficit of  $32,761,438.  The  independent
auditors' report dated February 12, 1997, except for Note 9 as to which the date
is March 14, 1997, on the Company's  consolidated  financial  statements  stated
that the Company has  generated  only minimal  operating  revenue,  has incurred
recurring  operating  losses  and  requires  additional  capital  and that these
conditions  raise  substantial  doubt  about its  ability to continue as a going
concern.  The  Company  expects  that it will  continue  to have a high level of
operating   expenses  and  will  be  required  to  make   significant   up-front
expenditures  in  connection  with  license  and  development   agreements  with
independent  companies,  universities  and other  institutions  for research and
development  and  product  development  activities.  As a  result,  the  Company
anticipates  significant  additional  operating  losses  for 1997 and that  such
losses will continue thereafter until such time, if ever, as the Company is able
to generate sufficient revenues to sustain its operations.

         The Company's ability to achieve profitable  operations is dependent in
large part on regulatory  approvals of its products and  technologies and on its
ability  to  enter  into  manufacturing  and  marketing  agreements  with  other
pharmaceutical,  biomedical or medical companies. There can be no assurance that
the Company will ever achieve profitable operations.

SIGNIFICANT LIQUIDITY RESTRAINTS

         The Company's  cash available for funding its operations as of June 30,
1997 was $539,287.  As of such date,  the Company had trade payables and accrued
liabilities  of $504,870,  current  research  obligations  of $331,634 and other
liabilities of $120,785.  In addition,  the Company is obligated to fund between
June 30, 1997 and June 30, 1998 approximately  $1,850,000 in the aggregate under
existing agreements. The Company will be required to obtain additional funds for

                                       -9-

<PAGE>

its business  through  operations  or equity or debt  financings,  collaborative
arrangements with corporate partners or from other sources.  No assurance can be
given  that these  funds  will be  available  for the  Company  to  finance  its
development on acceptable  terms, if at all. If adequate funds are not available
from operations or additional  sources of funding,  the Company's  business will
suffer a material  adverse effect.  As of the date of this Prospectus there were
25,500  shares  of the  Company's  Series A  Cumulative  Convertible  Redeemable
Preferred  Stock (the "Series A Preferred  Stock") issued and  outstanding.  The
Series A  Preferred  Stock is  redeemable  by holders  for $125 per share in the
event of (i) any  reclassification  or  change of  outstanding  shares of Common
Stock issuable upon  Conversion of Series A Preferred Stock (other than a change
in par value),  (ii) any consolidation or merger to which the Company is a party
other than a merger in which the Company is the continuing corporation and which
does not result in any  reclassification  of, or certain changes in, outstanding
shares of Common Stock or (iii) any sale or conveyance  of all or  substantially
all of the property or business of the Company as an entirety. In addition, upon
the occurrence of certain  changes of control,  Series A Preferred Stock holders
may  redeem  their  shares of Series A  Preferred  Stock for an amount per share
equal to the greater of (a) $125 and (b) the product of the aggregate  number of
shares  of  Common  Stock  into  which a share of  Series A  Preferred  Stock is
otherwise  convertible on the date preceding the change of control multiplied by
the then current market price of a share of Common Stock.

NEED FOR ADDITIONAL FINANCING

         Since the Company does not expect to generate substantial revenues from
the sale of any products or  technologies in the immediate  future,  the Company
will require  substantial  additional  funds from other  sources to complete its
research and development,  to conduct additional clinical tests and to establish
manufacturing and marketing  relationships  with  pharmaceutical,  biomedical or
medical companies.  The Company will attempt to acquire funds for these purposes
through  operations,   additional  equity  or  debt  financings,   collaborative
arrangements with corporate partners or from other sources. Management estimates
that, based on the status of the Company's  current  projects,  the Company will
require $8,000,000 to satisfy its cash requirements for research and development
and $3,100,000 to satisfy its cash  requirements for general and  administrative
costs during the next twelve  months.  The Company is  currently in  discussions
with  various  parties  that may be  interested  in  providing  the Company with
financing  but,  as of the  date of this  Prospectus,  no  commitment  has  been
received from potential sources of additional funding. No assurance can be given
that these funds will be available for the Company to finance its development on
acceptable terms, if at all. If adequate funds are not available from operations
or additional sources of funding,  the Company's business will suffer a material
adverse effect.

LONG TERM DEVELOPMENT OF TECHNOLOGIES; NO COMMERCIALIZATION OF PRODUCTS TO DATE

         The  Company has not yet begun to  generate  revenues  from the sale of
products or  technologies.  The Company is funding  research that began, in some
cases,  many years  before the Company  acquired  rights in such  projects.  The
Company's  products  and  technologies  will  require   significant   additional
development,   laboratory  and  clinical   testing  and   investment   prior  to
commercialization.   The  Company  does  not  expect  regulatory   approval  for
commercial sales of any of its products or technologies in the immediate future.
There  can  be  no  assurance  that  such  products  or  technologies   will  be
successfully  developed,  prove to be safe and  efficacious in clinical  trials,
meet applicable regulatory standards,  obtain required regulatory approvals,  be
capable of being  produced in commercial  quantities  at reasonable  costs or be
successfully commercialized and marketed.

ROYALTY PAYMENT OBLIGATIONS

         The owners and  licensors  of the  technology  rights  acquired  by the
Company are entitled to receive up to 50% of all  royalties and payments in lieu
of

                                      -10-

<PAGE>
royalties received by the Company from commercialization, if any, of products in
respect of which the Company  holds  licenses.  Accordingly,  in addition to its
substantial investment in research and development of technologies,  the Company
will be  required to make  substantial  payments  to others in  connection  with
revenues derived from commercialization of products, if any, in respect of which
the Company holds licenses.  Consequently, the Company will not receive the full
amount of any revenues  that may be derived from  commercialization  of products
derived from the Company's technologies to fund ongoing operations.

POTENTIAL LOSS OF RIGHTS UPON DEFAULT

         Under the terms of existing  agreements,  the Company is  obligated  to
make  periodic  installments  to finance  research  and  development  activities
according to specified  budgets.  The Company is obligated to fund approximately
$1,300,000 in the aggregate under existing  agreements  during the  twelve-month
period  following  September 30, 1997. In the event that the Company defaults in
the  payment  of  an  installment  under  the  terms  of an  existing  licensing
agreement,  its rights  thereunder  could be forfeited.  As a  consequence,  the
Company could lose all rights under a license  agreement to the related licensed
technology,  notwithstanding  the total  investment made through the date of the
default.  There can be no assurance that unforeseen obligations or contingencies
will not  deplete  the  Company's  financial  resources  and,  accordingly,  the
Company's resources may not be available to fulfill the Company's commitments.

DEPENDENCE ON PRINCIPAL INVESTIGATORS

         The Company is dependent upon the active participation of its principal
investigators in the advancement of the research and development associated with
their related projects.  The loss of a principal  investigator,  particularly in
the early  stages of the  development  of a  technology,  could  have a material
adverse effect on the related project and the Company's prospects.  To date, the
Company has not suffered the loss of any of its principal  investigators  on any
projects that are under active development.

RAPID TECHNOLOGICAL CHANGE; COMPETITION

         The medical research field is subject to rapid technological change and
innovation.  Pharmaceutical and biomedical  research and product development are
rapidly  evolving  fields in which  developments  are  expected to continue at a
rapid pace.  Reports of progress and potential  breakthroughs are occurring with
increasing  frequency.  There can be no  assurance  that the Company will have a
competitive  advantage in its fields of technology or in any of the other fields
in which the Company may concentrate its efforts.

         The  Company's  success  will  depend  upon its  ability to develop and
maintain   a   competitive   position   in   the   research,   development   and
commercialization   of  products  and   technologies  in  its  areas  of  focus.
Competition from  pharmaceutical,  chemical,  biomedical and medical  companies,
universities,  research  and other  institutions  is intense  and is expected to
increase.  All, or substantially  all, of these  competitors have  substantially
greater research and development  capabilities,  experience,  and manufacturing,
marketing,   financial  and  managerial  resources.   Further,  acquisitions  of
competing  companies by large  pharmaceutical  or other  companies could enhance
such competitors' financial,  marketing and other capabilities.  There can be no
assurance that developments by others will not render the Company's  products or
technologies  obsolete or not  commercially  viable or that the Company  will be
able to keep pace with technological developments.

GOVERNMENT REGULATION

         The Company's ongoing research and development  projects are subject to
rigorous  FDA  approval   procedures.   The  preclinical  and  clinical  testing
requirements to demonstrate safety and efficacy in each clinical indication (the
specific condition intended to be treated) and regulatory approval processes of

                                      -11-

<PAGE>
the FDA can  take a  number  of  years  and  will  require  the  expenditure  of
substantial  resources by the Company.  Delays in obtaining  FDA approval  would
adversely  affect the  marketing of products to which the Company has rights and
the Company's ability to receive product revenues or royalties.  Moreover,  even
if FDA  approval is  obtained,  a marketed  product,  its  manufacturer  and its
manufacturing   facilities   are  subject  to  continual   review  and  periodic
inspections  by the FDA, and a later  discovery of previously  unknown  problems
with a product,  manufacturer  or facility  may result in  restrictions  on such
product  or  manufacturer.  Failure  to comply  with the  applicable  regulatory
requirements can, among other things, result in fines, suspensions of regulatory
approvals,  product recalls,  operating  restrictions and criminal  prosecution.
Additional government regulation may be established which could prevent or delay
regulatory approval of the Company's products.  Sales of pharmaceutical products
outside the United States are subject to foreign  regulatory  requirements  that
vary widely from country to country.  Even if FDA  approval  has been  obtained,
approval of a product by comparable regulatory  authorities of foreign countries
must be obtained  prior to the  commencement  of marketing  the product in those
countries.  The time  required to obtain such  approval may be longer or shorter
than  that  required  for  FDA  approval.  The  Company  has  no  experience  in
manufacturing or marketing in foreign  countries nor in matters such as currency
regulations,  import-export  controls or other trade laws. To date,  the Company
has not received final regulatory  approval from the FDA or any other comparable
foreign regulatory authority in respect of any product or technology. Management
currently  believes that its MSI Inhaler will be its first technology to receive
final FDA  approval,  which  approval is  currently  estimated to be received in
approximately three to four years; however,  there can be no assurance that such
approval will be granted by the FDA.

RISKS INCIDENT TO PATENT APPLICATIONS AND RIGHTS

         The  Company's  success  will  depend in part on its  ability to obtain
patent  protection  for  products  and  processes  and to maintain  trade secret
protection and operate without  infringing the proprietary rights of others. The
degree of patent  protection  to be afforded to  pharmaceutical,  biomedical  or
medical  inventions is an uncertain  area of the law.  There can be no assurance
that the Company will develop or receive  sublicenses or other rights related to
proprietary  technology  which are  patentable,  that any patents  pending  will
issue,  or that any issued patents will provide the Company with any competitive
advantages or will not be challenged by third parties. Furthermore, there can be
no assurance  that others will not  independently  duplicate or develop  similar
technologies to those developed by or licensed to the Company.

         The  Company  supports  and  collaborates  in  research   conducted  at
universities and other institutions.  There can be no assurance that the Company
will have or be able to acquire  exclusive  rights to  inventions  or  technical
information  derived from such collaborations or that disputes will not arise as
to such exclusive rights or any derivative or related research programs.  If the
Company is  required  to defend  against  charges of patent  infringement  or to
protect its own proprietary rights against third parties, substantial costs will
be  incurred  and  the  Company  could  lose  rights  to  certain  products  and
technologies.

RELIANCE ON THIRD PARTIES; NO MARKETING OR MANUFACTURING CAPABILITIES

         The Company does not intend to  manufacture  or market  products it may
develop  using  its  technologies.  The  Company  will  attempt  to  enter  into
manufacturing   and   marketing   agreements   with  one  or  more   established
pharmaceutical,  biomedical  and medical  companies  for any  products  that are
developed.  There can be no assurance that other  pharmaceutical,  biomedical or
medical  companies will be interested in the Company's  products or technologies
or be willing to enter  into  manufacturing  or  marketing  agreements  on terms
acceptable   to  the  Company.   Further,   there  can  be  no  assurance   that
pharmaceutical,   biomedical  or  other  medical   companies   will  succeed  in
manufacturing  and marketing the Company's  products or technologies or that the
Company will derive revenues from its products or technologies.

                                      -12-

<PAGE>

DEPENDENCE UPON OBTAINING HEALTHCARE REIMBURSEMENT

         The Company's ability to commercialize human therapeutic and diagnostic
products  may  indirectly  depend in part on the extent to which  costs for such
products  and  technologies  are  reimbursed  by  private  health  insurance  or
government  health  programs.  The uncertainty  regarding  reimbursement  may be
especially  significant in the case of newly approved products.  There can be no
assurance  that  price  levels  will be  sufficient  to  provide a return to the
Company on its investment in new products and technologies.

ADEQUACY OF PRODUCT LIABILITY INSURANCE

         The  use  of the  Company's  proposed  products  and  processes  during
testing, and after approval,  may entail inherent risks of adverse effects which
could expose the Company to product liability  claims.  Product liability claims
could have a material adverse effect on the business and financial  condition of
the Company.  The Company plans to obtain, and plans to require its licensees to
obtain,   product  liability  insurance  at  an  appropriate  stage  of  product
development  and  commercialization.  There can be no assurance that the Company
and its licensees will be able to maintain or obtain adequate product  liability
insurance on  acceptable  terms or that such  insurance  will  provide  adequate
coverage against all potential claims.

VOLATILITY OF MARKET PRICE OF SECURITIES

         The market price of securities of firms in the  biotechnology  industry
has tended to be volatile.  Announcements  of  technological  innovations by the
Company  or its  competitors,  developments  concerning  proprietary  rights and
concerns  about safety and other factors may have a material  adverse  effect on
the Company's  business or financial  condition.  The market price of the Common
Stock may be  significantly  affected by  announcements  of  developments in the
medical field generally or the Company's research areas specifically.  The stock
market has experienced  volatility in market prices of companies  similar to the
Company  that  has  often  been  unrelated  to the  operating  results  of  such
companies.  This  volatility  may have a material  adverse  effect on the market
price of the Common Stock.

OUTSTANDING OPTIONS AND WARRANTS; DILUTION

         As of  September  30,  1997,  the  Company had  reserved  approximately
4,515,000  shares of Common  Stock for  issuance  upon  exercise of  outstanding
options  and  warrants,  including  shares of  Common  Stock  issuable  upon the
exercise of options and warrants  held by officers and directors of the Company.
The Company has filed registration  statements with the Commission  covering the
resale  of  substantially  all of the  shares of Common  Stock  underlying  such
options and warrants. The exercise of options and outstanding warrants and sales
of Common Stock issuable thereunder could have a significant  dilutive effect on
the  market  price of shares of Common  Stock and could  materially  impair  the
Company's  ability  to raise  capital  through  the  future  sale of its  equity
securities.

NO DIVIDENDS

         Holders of Common Stock are  entitled to receive such  dividends as may
be declared by the Board of Directors of the Company.  To date,  the Company has
not declared or paid any dividends on its Common Stock, and the Company does not
anticipate paying cash dividends in the foreseeable future.  Rather, the Company
intends to apply any earnings to the expansion and development of its business.

AUTHORIZATION OF SERIES A PREFERRED STOCK

         The Company's  Certificate of Incorporation  authorizes the issuance of
"blank check" preferred stock with such designations,  rights and preferences as
may be  determined  from  time  to  time  by the  Board  of  Directors,  without
shareholder approval. In the event of issuance, such preferred stock could be

                                      -13-

<PAGE>
utilized, under certain circumstances, as a method of discouraging,  delaying or
preventing a change in control of the Company and preventing  shareholders  from
receiving a premium  for their  shares in  connection  with a change of control.
Except for the issuance of shares of Series A Preferred  Stock that  occurred in
connection with the  consummation  of a private  placement in February 1997, the
Company has no present  intention  to issue any shares of its  preferred  stock;
however,  there can be no assurance  that the Company will not issue  additional
shares of its preferred stock in the future.

EXERCISE OF SERIES A WARRANTS AND CONVERSION OF SERIES A CUMULATIVE CONVERTIBLE
REDEEMABLE PREFERRED STOCK

         As of the date of this Prospectus,  there are 25,500 shares of Series A
Preferred Stock  outstanding  that are convertible  into shares of Common Stock.
See  "Selling  Stockholders."  Each share of Series A  Preferred  Stock  earns a
cumulative  dividend payable in shares of Common Stock at a rate per share equal
to 7.0% per annum of the original $100.00 purchase price per share of the Series
A Preferred  Stock.  Cumulative  stock dividends on shares of Series A Preferred
Stock are  payable at the time of  conversion.  Each share of Series A Preferred
Stock may be converted  after May 29, 1997 at varying rates of  conversion.  The
conversion rate on Series A Preferred Stock will be adjusted,  and the number of
shares  beneficially  owned by the holders thereof will vary, to reflect changes
in the market  price of the Common  Stock,  stock  dividends,  stock  splits and
certain other circumstances.  For a further description of the rights of holders
of Series A Preferred  Stock,  see the  Certificate  of  Designation of Series A
Cumulative  Convertible  Redeemable  Preferred  Stock filed as an exhibit to the
Company's  Annual  Report on Form 10-KSB for the fiscal year ended  December 31,
1996.  Holders of Series A Preferred  Stock also hold  warrants  (the  "Series A
Warrants") entitling such holders to acquire a total of 351,539 shares of Common
Stock at an exercise  price of $3.65 per share,  subject to adjustment  upon the
occurrence of certain events. The exercise of Series A Warrants,  the conversion
of shares of Series A Preferred  Stock and the subsequent sale of such shares of
Common Stock issuable upon such exercise and conversion could have a significant
negative  effect on the market  price of the Common  Stock and could  materially
impair the Company's  ability to raise capital through the future sale of equity
securities.

                                 USE OF PROCEEDS

         The  Company  will  receive a total of  $392,000  in the event that all
shares of Common Stock  offered  hereby that are issuable  upon  exercise of the
Debenture Warrants have been issued upon such exercise.  The Company anticipates
that the net  proceeds  will be used as to fund  the  research  and  development
relating  to the MSI Inhaler  and for  working  capital  and  general  corporate
purposes of the Company,  including the possible  acquisitions  of rights in new
drug development opportunities.  The amounts and rate of application of such net
proceeds will be subject,  among other things,  to successful  completion of the
various  stages of research of each of the Company's  research  projects and the
Company's identification and acquisition of rights in new technologies after the
date of this Prospectus,  which amounts and rate cannot be precisely  determined
at this time.  Until such proceeds are fully used, the Company intends to invest
such proceeds in investment grade,  short-term  interest-bearing  obligations or
U.S. government obligations.  The Company will not receive any proceeds from the
offer and resale of the Common Stock offered hereby.


                                 DIVIDEND POLICY

         Holders of Common Stock are  entitled to receive such  dividends as may
be declared by the Board of  Directors  of the  Company.  The Company  presently
intends  to  retain  earnings,  if any,  for use in its  business  and  does not
anticipate  paying  dividends  (other than stock dividends  payable on shares of
Series A Preferred  Stock) on its  outstanding  capital stock in the foreseeable
future.  Future  payments  of cash  dividends  will  depend  upon the  financial
condition,

                                      -14-

<PAGE>
results of operations and capital  requirements  of the Company as well as other
factors deemed relevant by the Board of Directors.


                               RECENT DEVELOPMENTS

         On April 25,  1997,  Camelot  Pharmacal,  L.L.C.,  a  Missouri  limited
liability company ("Camelot"), merged with and into CP Pharmaceuticals,  Inc., a
newly formed subsidiary of the Company. The principals of Camelot at the time of
the merger were Loren G. Peterson, Carl F. Siekmann and David A. Byron. Pursuant
to the related  agreement  and plan of merger,  Messrs.  Peterson,  Siekmann and
Byron each received 200,000 shares of Common Stock. The 200,000 shares of Common
Stock were issued pursuant to the exemption from registration under Section 4(2)
of the  Securities  Act. Each of Messrs.  Peterson,  Siekmann and Byron executed
agreements in which they represented  that they were "accredited  investors" and
had been given the  opportunity  to meet with Company  management and to receive
such documentation  relating to the Company's operations and financial condition
as they deemed  necessary.  Following the  consummation  of the merger,  each of
Messrs.  Peterson,  Siekmann and Byron entered into  employment  agreements with
Sheffield and received  stock options  providing  each  individual  the right to
purchase  up to  400,000  shares of Common  Stock.  The  Company  has  agreed to
reimburse  Messrs.  Peterson,  Siekmann and Byron upon the occurrence of certain
events for certain  income  taxes  payable by them upon  exercise of their stock
options in an amount of up to $250,000  per  person.  At the time of the merger,
Anthony B.  Alphin,  Jr.,  Bernard  Laurent,  Stephen  Sohn and  Michael  Zeldin
resigned as Directors of the Company and Mr.  Peterson was elected a Director of
the Company.

         In May 1997, the Company reported findings from its Phase I/II clinical
trial to assess the safety and  antiviral  activity of a single  infusion of the
Company's HIV/AIDS therapeutic, RBC-CD4. The trial, conducted in 19 HIV-infected
subjects,  had as its primary objectives to confirm the previously reported long
half-life for RBC-CD4 and to measure  safety and  tolerability  with a secondary
objective  to  assess  activity  of a  single  dose of  RBC-CD4.  Study  results
confirmed the half-life of RBC-CD4 and the related  safety data  indicated  that
RBC-CD4 was safe and well-tolerated by the HIV-infected  patients. The secondary
objective  of the trial was to assess the activity of two dose levels of RBC-CD4
in HIV-infected  patients.  The outcome  measures  suggest that little sustained
activity was seen from a single  infusion of RBC-CD4 at either of the two doses.
The data suggests that the frequency of a positive response,  when reported, was
greater at the early time points.  It should be emphasized  that RBC-CD4 in this
study was evaluated as a single-dose monotherapy.  The Company also announced at
such time its intention to seek a partner for the RBC-CD4 technology.

         On September 22, the private  placement of  $1,750,000  of  Convertible
Debentures was  consummated.  The Company received net proceeds of $1,600,000 in
such  private  placement.  See  "Description  of  Securities  -  6%  Convertible
Subordinated Debentures" below.

                                      -15-

<PAGE>
                              SELLING STOCKHOLDERS

         Set forth  below is  information  at October 15,  1997  concerning  the
beneficial ownership of Common Stock of each of the Selling Stockholders who are
offering shares of Common Stock in this offering.

<TABLE>
<CAPTION>
                                          Shares Beneficially             Shares to be               Shares Beneficially
                                            Owned Prior to                   Sold in                     Owned After
                                              Offering(1)(2)                Offering                      Offering(3)
                                 -------------------------------        --------------      --------------------------------
NAME(1)                                 NUMBER             PERCENT                                NUMBER             PERCENT
- -------                                 ------             -------                                ------             -------
<S>                                       <C>                <C>            <C>                    <C>                  <C>
The Shaar Group Ltd.                      946,515(4)(5)      7.0%           2,595,734              0(4)                 *
Shaar Advisory Services Ltd.              108,518(4)(6)       *               297,600              0(4)                 *
</TABLE>

- -----------------------
*        Less than 1%.

(1)      The persons named in the table, to the Company's  knowledge,  have sole
         voting  and  investment  power  with  respect  to all  shares  shown as
         beneficially  owned by them,  subject to community  property laws where
         applicable and the information contained in the footnotes hereunder.

(2)      Determined in accordance with Rule 13-3(d) of the Exchange Act.

(3)      Assumes all shares of Common Stock offered  hereby are sold pursuant to
         the registration statement of which the prospectus constitutes a part.

(4)      The  number of  shares of Common  Stock  issuable  upon  conversion  of
         Convertible  Debentures  and in  respect  of  interest  in lieu of cash
         issuable thereon will vary based upon the market value of the Company's
         publicly-  traded Common Stock prior to the date of  conversion.  For a
         description of the method of determining the number of shares of Common
         Stock issuable upon conversion of shares of Convertible Debentures, see
         "Description of Securities - Convertible Debentures." Consequently, due
         to the fluctuating conversion rate of the Convertible  Debentures,  the
         number  of  shares  of  Common  Stock  that  a  holder  of  Convertible
         Debentures may receive upon  conversion or in lieu of cash interest may
         exceed the number of shares of Common  Stock such  holder  beneficially
         owns as determined pursuant to Section 13-3(d) of the Exchange Act. For
         purposes  of the  disclosure  of  Shares  Beneficially  Owned  Prior to
         Offering,  it has been assumed (i) that the applicable conversion price
         will be $1.9125  (calculated in accordance with the applicable terms of
         the  Convertible   Debentures  as  of  the  date  of  issuance  of  the
         Convertible   Debentures  on  September   22,  1997),   (ii)  that  all
         Convertible  Debentures  beneficially owned by the Selling  Stockholder
         are converted into shares of Common Stock at such  conversion  price in
         accordance  with the applicable  terms of the  Convertible  Debentures,
         (iii) that all  Debenture  Warrants  beneficially  owned by the Selling
         Stockholder  have been  exercised  for shares of Common  Stock and (iv)
         that no  shares  of  Common  Stock  have  been  issued  to  holders  of
         Convertible  Debentures in lieu of cash interest thereon.  For purposes
         of the disclosure of Shares  Beneficially Owned After the Offering,  it
         has  been  assumed  that the  applicable  Selling  Stockholder  (x) has
         converted  all  Convertible  Debentures  beneficially  owned by it into
         shares of Common  Stock and has  received no Common  Stock  issuable in
         lieu of cash interest on such Convertible Debentures, (y) has exercised
         all Debenture  Warrants  beneficially  owned by it and (z) has sold all
         such shares of Common Stock received by it.

(5)      Consists of (i) 820,915 shares of Common Stock issuable upon conversion
         of  Conversion  Debentures  and (ii)  125,600  shares of  Common  Stock
         issuable upon exercise of Debenture Warrants.

(6)      Consists of (i) 94,118 shares of Common Stock issuable upon  conversion
         of  Convertible  Debentures  and (ii)  14,400  shares of  Common  Stock
         issuable upon exercise of Debenture Warrants.

                                      -16-

<PAGE>

                            DESCRIPTION OF SECURITIES

         The  Company is  currently  authorized  to issue  30,000,000  shares of
Common Stock,  $.01 par value per share, of which 12,604,770  shares were issued
and  outstanding  on the  date of  this  Prospectus,  and  3,000,000  shares  of
preferred  stock,  $.01 par value per share,  of which 25,500 shares of Series A
Preferred Stock were issued and outstanding on the date of this Prospectus.

COMMON STOCK

         Holders of shares of Common Stock are entitled to one vote per share on
all matters to be voted on by  shareholders  and do not have  cumulative  voting
rights.  Subject  to the rights of  holders  of  outstanding  shares of Series A
Preferred Stock and other holders of preferred stock of the Company, if any, the
holders of Common Stock are entitled to receive such  dividends,  if any, as may
be declared from time to time by the Board of Directors in its  discretion  from
funds legally  available  therefor,  and upon  liquidation or  dissolution,  are
entitled to receive all assets available for  distribution to the  shareholders.
The Common Stock has no preemptive or other  subscription  rights, and there are
no conversion  rights of redemption or sinking fund  provisions  with respect to
such shares.  All of the  outstanding  shares of Common Stock are fully paid and
nonassessable.

PREFERRED STOCK

         The Board of Directors is authorized  to issue the  preferred  stock in
one  or  more  series  and  to  fix  the  rights,  preferences,  privileges  and
restrictions,  including the dividend rights,  conversion rights, voting rights,
rights  and  terms  of  redemption,  redemption  price  or  prices,  liquidation
preferences and the number of shares constituting any series or the designations
of such  series,  without any further  vote or action by the  stockholders.  The
issuance  of  preferred  stock may have the  effect of  delaying,  deferring  or
preventing  a change in control of the Company  without  further  actions of the
stockholders.  The issuance of preferred stock with voting and conversion rights
may adversely affect the voting power of the holders of Common Stock,  including
the loss of voting control to others.

SERIES A PREFERRED STOCK

         THE  DESCRIPTION  OF THE SERIES A  PREFERRED  STOCK  PROVIDED  BELOW IS
QUALIFIED  IN ITS  ENTIRETY BY THE  RELATIVE  RIGHTS,  PREFERENCES,  PRIVILEGES,
POWERS AND RESTRICTIONS OF THE SERIES A PREFERRED STOCK SET FORTH IN THE FORM OF
CERTIFICATE OF DESIGNATION  FOR THE SERIES A PREFERRED STOCK INCLUDED IN EXHIBIT
4.2 TO THE  COMPANY'S  ANNUAL  REPORT ON FORM  10-KSB FOR THE FISCAL  YEAR ENDED
DECEMBER 31, 1996, WHICH IS INCORPORATED BY REFERENCE INTO THIS PROSPECTUS.

         There are 25,500 shares of Series A Preferred  Stock  outstanding as of
the date of this Prospectus. Holders of Series A Preferred Stock have the right,
exercisable  commencing  May 29, 1997 and ending  February 28, 1999,  to convert
shares of Series A Preferred  Stock into shares of Common  Stock.  The number of
shares of Common Stock issuable upon conversion of Series A Preferred Stock will
equal  the  number of shares  of  Series A  Preferred  Stock to be so  converted
multiplied by a fraction,  the numerator of which is 100 and the  denominator of
which shall equal (a) $3.31875 in respect of conversions  occurring on or before
June 27,  1997,  (b) the lesser of (i)  $3.31875  and (ii) the  "current  market
price" per share of Common Stock as of the applicable conversion date in respect
of conversions occurring from June 28, 1997 to and including August 26, 1997 and
(c) the lesser of (i) $3.31875 and (ii) 85% of the  "current  market  price" per
share of  Common  Stock  as of the  applicable  conversion  date in  respect  of
conversions occurring after August 26, 1997, where "current market price" means,
with certain  exceptions,  the average of the closing bid prices of Common Stock
for the 10  consecutive  trading  days  ending the last  trading  day before the
applicable  conversion  date.  Each share of Series A  Preferred  Stock  earns a
cumulative  dividend payable in shares of Common Stock at a rate per share equal
to 7.0% of the original $100 purchase  price per share of the Series A Preferred
Stock.  Accrued  stock  dividends  payable in respect of the Series A  Preferred
Stock are payable at the time of conversion.  Under certain circumstances,  cash
is payable to holders of Series A Preferred Stock in lieu of Common Stock.


                                      -17-

<PAGE>
         The Series A  Preferred  Stock is  redeemable  by holders  for $125 per
share in the event of (i) any  reclassification  or change of outstanding shares
of Common Stock issuable upon conversion of Series A Preferred Stock (other than
a change in par value), (ii) any consolidation or merger to which the Company is
a party other than a merger in which the Company is the  continuing  corporation
and which does not result in any  reclassification  of, or change  (other than a
change in name, or par value,  or from par value to no par value, or from no par
value  to par  value,  or as a  result  of a  subdivision  or  combination)  in,
outstanding  shares of Common  Stock or (iii) any sale or  conveyance  of all or
substantially all of the property or business of the Company as an entirety.  In
addition,  upon the occurrence of a Change of Control,  Series A Preferred Stock
holders may redeem  their  shares of Series A Preferred  Stock for an amount per
share  equal to the  greater of (a) $125 and (b) the  product  of the  aggregate
number of shares of Common Stock into which a share of Series A Preferred  Stock
is otherwise  convertible on the date preceding the change of control multiplied
by the then  current  market  price of a share of Common  Stock.  A  "Change  in
Control" shall be deemed to have occurred at such time as either Douglas R. Eger
and  Thomas  M.  Fitzgerald  cease to be either a  director  or  officer  of the
Company.

6% CONVERTIBLE SUBORDINATED DEBENTURES

         THE  DESCRIPTION  OF  THE  CONVERTIBLE  DEBENTURES  PROVIDED  BELOW  IS
QUALIFIED  IN ITS  ENTIRETY  BY THE  TERMS  THEREOF  SET FORTH IN THE FORM OF 6%
CONVERTIBLE  SUBORDINATED  DEBENTURE  DUE SEPTEMBER 22, 2000 INCLUDED AS EXHIBIT
10.1  TO THE  REGISTRATION  STATEMENT  ON  FORM  S-3 OF  WHICH  THIS  PROSPECTUS
CONSTITUTES A PART.

         On September 22, 1997, the Company  consummated a private  placement of
$1,750,000  principal amount of its 6% Convertible  Subordinated  Debentures due
September 22, 2000. The Convertible  Debentures are convertible at the option of
holders from December 22, 1997 until maturity,  subject to certain  limitations,
into a number of shares of Common Stock equal to (i) the principal amount of the
Convertible Debenture being so converted divided by (ii) 75% of the market price
of the Common Stock as of the date of conversion. For purposes of any conversion
of Convertible  Debentures,  "market price"  generally  means the average of the
closing prices of the Common Stock for the five trading day period preceding the
applicable  conversion date. The Convertible  Debentures also earn interest at a
rate of 6.0% per annum  that is  payable  by the  Company,  at the option of the
holders and  subject to certain  conditions,  in share of its Common  Stock at a
conversion  rate  generally  equal to the average of the  closing  prices of the
Common Stock for the ten trading days preceding the applicable  interest payment
date. Subject to certain limitations,  the Convertible Debentures are subject to
mandatory  redemption in full upon the occurrence of certain  changes of control
events or upon an issuance of the  Company's  equity or debt  resulting in gross
proceeds to the Company of at least $6,000,000,  in each case at a premium above
the principal  amount of  Convertible  Debentures so redeemed.  The  Convertible
Debentures are subject to optional redemption in whole or in part by the Company
at any time at a premium over the principal amount of Convertible  Debentures so
redeemed. In connection with the sale of the Convertible Debentures,  purchasers
thereof  also  received  Debenture  Warrants  entitling  the holders  thereof to
purchase a total of 140,000 additional shares of Common Stock upon payment of an
exercise price of $2.80 per share, subject to certain  adjustments.  The Company
has granted  the  holders of the  Convertible  Debentures  certain  registration
rights in respect of the shares of Common Stock issuable upon  conversion of the
Convertible  Debentures,  in lieu of cash interest on the Convertible Debentures
and upon exercise of the Debenture Warrants. The registration statement of which
this  prospectus  constitutes  a part  is  intended  to  satisfy  the  Company's
registration obligations to the holders of the Convertible Debentures.

TRANSFER AGENT

         The  Company's  transfer  agent for its issued and  outstanding  Common
Stock is Harris Trust and Savings Bank, Houston, Texas.

                              PLAN OF DISTRIBUTION

         The Common Stock offered hereby may be offered from time to time on the
AMEX or on any other  securities  exchange on which Common Stock is listed or in
privately  negotiated  transactions,  at fixed  prices that may be  changed,  at
market  prices  prevailing  at the  time of  sale,  at  prices  related  to such
prevailing market prices or at

                                      -18-

<PAGE>
privately  negotiated prices.  Selling Stockholders may effect such transactions
by selling such shares of Common  Stock to or through one or more  underwriters,
brokers,  dealers  or agents and all such  underwriters,  brokers,  dealers  and
agents  may  receive  compensation  in the form of  discounts,  concessions,  or
commissions  from  stockholders  and/or the  purchasers  of shares for whom such
broker-dealers  may act as  agent or to whom  they  sell as  principal,  or both
(which  compensation  as to a particular  underwriter,  broker,  dealer or agent
might be in  excess  of  customary  commissions).  The  Company  has  agreed  to
indemnify the Selling Stockholders against certain liabilities,  including civil
liabilities under the Securities Act.

         Any  broker-dealer  acquiring Common Stock offered hereby may sell such
securities either directly, in its normal market-making  activities,  through or
to other  brokers on a principal or agency basis or to its  customers.  Any such
sales may be at prices then  prevailing on the AMEX,  at prices  related to such
prevailing  market  prices  or  at  negotiated  prices  to  its  customers  or a
combination  of such methods.  The Selling  Stockholders  and any  underwriters,
brokers,  dealers or agents that act in connection with the sale might be deemed
to be  "underwriters"  within the meaning of Section 2(11) of the Securities Act
and any commissions  received by them and any profit on the resale of securities
as principal may be deemed to be underwriting  discounts and  commissions  under
the Securities  Act. Any such  commissions,  as well as any applicable  transfer
taxes, are payable by the applicable Selling Stockholder.

                                  LEGAL MATTERS

         The validity of the issuance of the securities being offered hereby has
been passed upon for the Company by Olshan  Grundman Frome & Rosenzweig LLP, New
York, New York. Daniel J. Gallagher,  an attorney at such firm, is the holder of
options to purchase 15,000 shares of Common Stock.


                                     EXPERTS

         The  consolidated  financial  statements of Sheffield  Pharmaceuticals,
Inc. and subsidiaries (a development  stage  enterprise)  appearing in Sheffield
Pharmaceuticals, Inc.'s Annual Report (Form 10-KSB) for the years ended December
31, 1996 and 1995, have been audited by Ernst & Young LLP, independent auditors,
as set forth in their report  thereon (which  contains an explanatory  paragraph
with respect to  conditions  that raise  substantial  doubt about the  Company's
ability to continue  as a going  concern as further  described  in Note 1 to the
consolidated  financial  statements) included therein and incorporated herein by
reference.  The consolidated financial statements of Sheffield  Pharmaceuticals,
Inc. and  subsidiary (a  development  stage  enterprise)  as of and for the year
ended December 31, 1994  incorporated  by reference  herein have been audited by
Ernst & Young LLP,  independent  auditors,  as set forth in their report thereon
(which  contains an explanatory  paragraph with respect to conditions that raise
substantial  doubt about the Company's ability to continue as a going concern as
further described in Note 7 to the consolidated  financial  statements) included
therein  and  incorporated  herein by  reference.  Such  consolidated  financial
statements are, and audited financial  statements to be included in subsequently
filed  documents  will be,  incorporated  herein in reliance upon the reports of
Ernst & Young LLP pertaining to such financial statements (to the extent covered
by consents filed with the Securities  and Exchange  Commission)  given upon the
authority of such firm as experts in accounting and auditing.

         The  consolidated  financial  statements of Sheffield  Pharmaceuticals,
Inc. and subsidiary (a development stage enterprise) as of December 31, 1993 and
for the period from  October 17, 1986  (inception)  to December 31, 1993 and the
years ended  December  31,  1992 and 1993 have been  incorporated  by  reference
herein and in the registration  statement of which this Prospectus constitutes a
part in reliance upon the report of KPMG Peat Marwick LLP, independent certified
public accountants,  incorporated by reference herein, and upon the authority of
said firm as experts in accounting and auditing.

         The report of KPMG Peat  Marwick LLP  covering  the  December  31, 1993
consolidated  financial statements contains an explanatory paragraph that states
that the Company's  recurring losses and net deficit position raise  substantial
doubt  about its  ability  to  continue  as a going  concern.  The  consolidated
financial  statements do not include any adjustments  that might result from the
outcome of that uncertainty.

                                      -19-

<PAGE>
                             ADDITIONAL INFORMATION

         The Company has filed with the Commission a  Registration  Statement on
Form S-3 under the Securities Act (the "Registration Statement") with respect to
certain of the shares of Common Stock offered  hereby.  For further  information
with respect to the Company and the securities offered hereby, reference is made
to the Registration Statement. Statements contained in this Prospectus as to the
contents of any contract or other document are not necessarily complete,  and in
each instance,  reference is made to the copy of such contract or document filed
as an exhibit to the Registration Statement, each such statement being qualified
in all respects by such reference.

                                      -20-

<PAGE>
                         SHEFFIELD PHARMACEUTICALS, INC.

                                     PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.          OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

                  The  following  table sets forth an itemized  statement of all
estimated  expenses in  connection  with the  issuance and  distribution  of the
securities being registered:

         SEC Registration fees..................................     $  1,972.00
         Legal expenses.........................................       75,000.00
         AMEX Listing Fees......................................       17,500.00
         Accounting fees and expenses...........................        5,000.00
         Miscellaneous..........................................        5,528.00
                  Total.........................................     $105,000.00


ITEM 15.          INDEMNIFICATION OF DIRECTORS AND OFFICERS.

                  Except as hereinafter set forth, there is no statute,  charter
provision,  by-law,  contract or other  arrangement  under which any controlling
person,  director or officer of the Corporation is insured or indemnified in any
manner against liability which he may incur in his capacity as such.

                  Article   TENTH   of   the   Corporation's    Certificate   of
Incorporation provides as follows:

                  The  Corporation  shall,  to the fullest  extent  permitted by
Section145 of the General Corporation Law of the State of Delaware,  as the same
may be amended and  supplemented,  indemnify  any and all persons  whom it shall
have power to  indemnify  under said section from and against any and all of the
expenses,  liabilities  or  other  matters  referred  to in or  covered  by said
section,  and the  indemnification  provided  for  herein  shall  not be  deemed
exclusive of any other rights to which those  indemnified  may be entitled under
any By-Law,  agreement,  vote of  stockholders  or  disinterested  directors  or
otherwise,  both as to  action  in his  official  capacity  and as to  action in
another  capacity  while holding such office,  and shall continue as to a person
who has ceased to be a director,  officer,  employee or agent and shall inure to
the benefit of the heirs, executors and administrators of such a person.

                  Section  5.1 of the  By-laws of the  Corporation  provides  as
follows:

                  (a)  The   Corporation   shall   indemnify,   subject  to  the
requirements of subsection (d) of this Section, any person who was or is a party
or is  threatened  to be made a party to any  threatened,  pending or  completed
action,  suit  or  proceeding,   whether  civil,  criminal,   administrative  or
investigative  (other than an action by or in the right of the Corporation),  by
reason of the fact that he is or was a director,  officer,  employee or agent of
the  Corporation,  or is or was serving at the request of the  Corporation  as a
director, officer, employee or agent of another corporation,  partnership, joint
venture,  trust or other  enterprise,  against  expenses  (including  attorneys'
fees),  judgments,  fines and amounts paid in settlement actually and reasonably
incurred by him in connection  with such action,  suit or proceeding if he acted
in good faith and in a manner he reasonably  believed to be in or not opposed to
the best interests of the  Corporation  and, with respect to any criminal action
or proceeding,  had no reasonable cause to believe his conduct was unlawful. The
termination of any action,  suit or proceeding by judgment,  order,  settlement,
conviction or upon a

                                      II-1

<PAGE>
plea of nolo  contendere  or its  equivalent,  shall not,  of  itself,  create a
presumption  that the person did not act in good faith and in a manner  which he
reasonably  believed  to be in or not  opposed  to  the  best  interests  of the
Corporation  and,  with  respect  to any  criminal  action  or  proceeding,  had
reasonable cause to believe that his conduct was unlawful.

                  (b)  The   Corporation   shall   indemnify,   subject  to  the
requirements of subsection (d) of this Section, any person who was or is a party
or is  threatened  to be made a party to any  threatened,  pending or  completed
action or suit by or in the right of the  Corporation  to procure a judgment  in
its favor by reason of the fact that he is or was a director,  officer, employee
or  agent  of  the  Corporation  or is or was  serving  at  the  request  of the
Corporation as a director,  officer,  employee or agent of another  corporation,
partnership,   joint  venture,  trust  or  other  enterprise,  against  expenses
(including   attorneys'  fees)  actually  and  reasonably  incurred  by  him  in
connection  with the defense or settlement of such action or suit if he acted in
good faith and in a manner he reasonably believed to be in or not opposed to the
best interests of the  Corporation and except that no  indemnification  shall be
made in respect of any claim, issue or matter as to which such person shall have
been adjudged to be liable to the Corporation unless and only to the extent that
the Court of Chancery of the State of Delaware or the court in which such action
or  suit  was  brought  shall  determine  upon  application  that,  despite  the
adjudication of liability but in view of all the circumstances of the case, such
person is fairly and  reasonably  entitled to indemnity for such expenses  which
the Court of  Chancery  of the State of  Delaware or such other court shall deem
proper.

                  (c) To the extent that a director,  officer, employee or agent
of the  Corporation,  or a person serving in any other enterprise at the request
of the Corporation, has been successful on the merits or otherwise in defense of
any action,  suit or proceeding  referred to in  subsection  (a) and (b) of this
Section,  or in defense of any claim,  issue or matter therein,  the Corporation
shall indemnify him against  expenses  (including  attorneys' fees) actually and
reasonably incurred by him in connection therewith.

                  (d) Any indemnification  under subsections (a) and (b) of this
Section  (unless  ordered by a court) shall be made by the  Corporation  only as
authorized in the specific case upon a determination that indemnification of the
director,  officer,  employee or agent is proper in the circumstances because he
has met the applicable  standard of conduct set forth in subsections (a) and (b)
of this Section.  Such determination shall be made (1) by the Board of Directors
by a majority  vote of a quorum  consisting of directors who were not parties to
such action, suit or proceeding, or (2) if such a quorum is not obtainable,  or,
even if obtainable a quorum of  disinterested  directors,  or (3) by independent
legal counsel in a written opinion, or (4) by the stockholders.

                  (e)  Expenses  incurred  by a director,  officer,  employee or
agent in defending a civil or criminal action, suit or proceeding may be paid by
the  Corporation  in advance of the final  disposition  of such action,  suit or
proceeding  as  authorized  by  the  Board  of  Directors  upon  receipt  of  an
undertaking by or on behalf of the director, officer, employee or agent to repay
such amount if it shall  ultimately be determined  that he is not entitled to be
indemnified by the Corporation as authorized in this Section.

                  (f) The  indemnification  and advancement of expenses provided
by or granted pursuant to, the other subsections of this Section shall not limit
the  Corporation  from  providing any other  indemnification  or  advancement of
expenses  permitted by law nor shall it be deemed  exclusive of any other rights
to which  those  seeking  indemnification  may be  entitled  under  any  by-law,
agreement, vote of stockholders or disinterested directors or otherwise, both as
to action in his official  capacity and as to action in another  capacity  while
holding such office.

                  (g) The  Corporation  may purchase  and maintain  insurance on
behalf of any person who is or was a director, officer, employee or agent of the
Corporation, or who is or was serving at the request of the Corporation as a

                                      II-2

<PAGE>

director, officer, employee or agent of another corporation,  partnership, joint
venture,  trust or other enterprise  against any liability  asserted against him
and incurred by him in any such capacity,  or arising out of his status as such,
whether or not the  Corporation  would have the power to  indemnify  him against
such liability under the provisions of this Section.

                  (h) The  indemnification  and advancement of expenses provided
by, or granted pursuant to this section shall,  unless  otherwise  provided when
authorized or ratified, continue as to a person who has ceased to be a director,
officer,  employee  or agent  and  shall  inure  to the  benefit  of the  heirs,
executors and administrators of such a person.

                  (i)  For the  purposes  of this  Section,  references  to "the
Corporation"  shall  include,  in addition  to the  resulting  corporation,  any
constituent corporation (including any constituent of a constituent) absorbed in
a consolidation or merger which, if its separate existence had continued,  would
have had power and authority to indemnify its directors,  officers, employees or
agents, so that any person who is or was a director,  officer, employee or agent
of such  constituent  corporation,  or is or was  serving at the request of such
constituent  corporation  as a director,  officer,  employee or agent of another
corporation,  partnership, joint venture, trust or other enterprise, shall stand
in the same  position  under the  provisions of this Section with respect to the
resulting  or  surviving  corporation  as he would  have  with  respect  to such
constituent corporation if its separate existence had continued.

                  (j)  This   Section  5.1  shall  be   construed  to  give  the
Corporation the broadest power  permissible by the Delaware General  Corporation
Law, as it now stands and as heretofore amended.

                  Section  145 of the  General  Corporation  Law of the State of
Delaware provides as follows:


                  (a) A  corporation  may  indemnify  any person who was or is a
party  or is  threatened  to be  made a  party  to any  threatened,  pending  or
completed action, suit or proceeding, whether civil, criminal, administrative or
investigative  (other than an action by or in the right of the  corporation)  by
reason of the fact that he is or was a director,  officer,  employee or agent of
the  corporation,  or is or was serving at the request of the  corporation  as a
director, officer, employee or agent of another corporation,  partnership, joint
venture,  trust or other  enterprise,  against  expenses  (including  attorneys'
fees),  judgments,  fines and amounts paid in settlement actually and reasonably
incurred by him in connection  with such action,  suit or proceeding if he acted
in good faith and in a manner he reasonably  believed to be in or not opposed to
the best interests of the corporation,  and, with respect to any criminal action
or proceeding,  had no reasonable cause to believe his conduct was unlawful. The
termination of any action,  suit or proceeding by judgment,  order,  settlement,
conviction,  or upon a plea of nolo contendere or its equivalent,  shall not, of
itself,  create a presumption that the person did not act in good faith and in a
manner  which  he  reasonably  believed  to be in or not  opposed  to  the  best
interests  of the  corporation,  and,  with  respect to any  criminal  action or
proceeding, had reasonable cause to believe that his conduct was unlawful.

                  (b) A  corporation  may  indemnify  any person who was or is a
party  or is  threatened  to be  made a  party  to any  threatened,  pending  or
completed  action or suit by or in the  right of the  corporation  to  procure a
judgment  in its  favor  by  reason  of the fact  that he is or was a  director,
officer,  employee  or agent of the  corporation,  or is or was  serving  at the
request of the corporation as a director,  officer, employee or agent of another
corporation,  partnership,  joint  venture,  trust or other  enterprise  against
expenses (including  attorneys' fees) actually and reasonably incurred by him in
connection  with the defense or settlement of such action or suit if he acted in
good faith and in a manner he reasonably believed to be in or not opposed to the
best interests of the  corporation and except that no  indemnification  shall be
made in respect of any

                                      II-3

<PAGE>
claim,  issue or matter as to which such person  shall have been  adjudged to be
liable  to the  corporation  unless  and only to the  extent  that the  Court of
Chancery or the court in which such action or suit was brought  shall  determine
upon application that,  despite the adjudication of liability but in view of all
the circumstances of the case, such person is fairly and reasonably  entitled to
indemnity  for such  expenses  which the Court of  Chancery  or such other court
shall deem proper.

                  (c) To the extent that a director,  officer, employee or agent
of a  corporation  has been  successful on the merits or otherwise in defense of
any action,  suit or proceeding  referred to in subsections  (a) and (b) of this
section,  or in  defense  of any  claim,  issue or matter  therein,  he shall be
indemnified against expenses (including attorneys' fees) actually and reasonably
incurred by him in connection therewith.

                  (d) Any indemnification  under subsections (a) and (b) of this
section  (unless  ordered by a court) shall be made by the  corporation  only as
authorized in the specific case upon a determination that indemnification of the
director,  officer,  employee or agent is proper in the circumstances because he
has met the applicable  standard of conduct set forth in subsections (a) and (b)
of this section.  Such determination shall be made (1) by the board of directors
by a majority  vote of a quorum  consisting of directors who were not parties to
such action, suit or proceeding, or (2) if such a quorum is not obtainable,  or,
even  if  obtainable  a  quorum  of  disinterested   directors  so  directs,  by
independent legal counsel in a written opinion, or (3) by the stockholders.

                  (e)  Expenses  (including  attorneys'  fees)  incurred  by  an
officer  or  director  in  defending  any  civil  criminal   administrative   or
investigative  action,  suit or  proceeding  may be paid by the  corporation  in
advance of the final disposition of such action, suit or proceeding upon receipt
of an  undertaking  by or on behalf of such  director  or  officer to repay such
amount  if it shall  ultimately  be  determined  that he is not  entitled  to be
indemnified  by the  corporation  as authorized  in this section.  Such expenses
(including  attorneys'  fees)  incurred by other  employees and agents may be so
paid upon such terms and  conditions,  if any, as the board of  directors  deems
appropriate.

                  (f) The  indemnification  and advancement of expenses provided
by, or granted  pursuant to, the other  subsections of this section shall not be
deemed exclusive of any other rights to which those seeking  indemnification  or
advancement  of expenses  may be entitled  under any bylaw,  agreement,  vote of
stockholders or disinterested  directors or otherwise,  both as to action in his
official  capacity  and as to action in  another  capacity  while  holding  such
office.

                  (g) A  corporation  shall have power to purchase  and maintain
insurance on behalf of any person who is or was a director, officer, employee or
agent of the corporation, or is or was serving at the request of the corporation
as a director.  officer, employee or agent of another corporation,  partnership,
joint venture,  trust or other enterprise against any liability asserted against
him and  incurred by him in any such  capacity,  or arising out of his status as
such,  whether  or not the  corporation  would have the power to  indemnify  him
against such liability under this section.

                  (h)  For  purposes  of  this   section,   references  to  "the
corporation"  shall  include,  in addition  to the  resulting  corporation,  any
constituent corporation (including any constituent of a constituent) absorbed in
a consolidation or merger which, if its separate existence had continued,  would
have had power and authority to indemnify its directors, officers, and employees
or agents,  so that any person who is or was a  director,  officer,  employee or
agent of such  constituent  corporation,  or is or was serving at the request of
such  constituent  corporation  as a  director,  officer,  employee  or agent of
another  corporation,  partnership,  joint venture,  trust or other  enterprise,
shall  stand in the  same  position  under  this  section  with  respect  to the
resulting  or  surviving  corporation  as he would  have  with  respect  to such
constituent corporation if its separate existence had continued.

                                      II-4

<PAGE>

                  (i)  For  purposes  of  this  section,  references  to  "other
enterprises"  shall include employee benefit plans;  references to "fines" shall
include  any excise  taxes  assessed on a person  with  respect to any  employee
benefit  plan;  and  references  to "serving at the request of the  corporation"
shall  include  any  service as a  director,  officer,  employee or agent of the
corporation  which imposes  duties on, or involves  services by, such  director.
officer,  employee,  or agent with  respect to an  employee  benefit  plan,  its
participants  or  beneficiaries;  and a person  who acted in good faith and in a
manner he  reasonably  believed to be in the  interest of the  participants  and
beneficiaries  of an  employee  benefit  plan shall be deemed to have acted in a
manner "not opposed to the best interests of the  corporation" as referred to in
this section.

                  (j) The  indemnification  and advancement of expenses provided
by, or granted pursuant to, this section shall,  unless otherwise  provided when
authorized or ratified, continue as to a person who has ceased to be a director,
officer,  employee  or agent  and  shall  inure  to the  benefit  of the  heirs,
executors and administrators of such a person.

                  The  Company  maintains  a directors  and  officers  liability
insurance policy for coverage of up to $5,000,000.

ITEM 16.          EXHIBITS.

         The following Exhibits are included pursuant to Regulation S-K.

     NO.         DESCRIPTION                                           REFERENCE

           3.1   Certificate of Incorporation of Registrant, as             (1)
                 amended

           3.2   Bylaws of Registrant                                       (2)

           4.1   Form of Common Stock Certificate                           (3)

           5.1   Opinion of Olshan Grundman Frome & Rosenzweig LLP          (4)
                 (includes Consent)

          10.1   Form of Registrant's 6% Convertible Subordinated           (4)
                 Debenture due September 22, 2000

          23.1   Consent of KPMG Peat Marwick LLP                           (4)

          23.2   Consent of Ernst & Young LLP                               (4)

          23.3   Consent of Olshan  Grundman  Frome & Rosenzweig LLP
                 included in Exhibit 5.1

          24.1   Power of Attorney (included in the signature
                 page to this Registration Statement)

- ---------------------
         (1)      Incorporated  by  reference  to exhibit no. 3.1 filed with the
                  Registrant's  Report on Form 10-Q for the fiscal quarter ended
                  June 30, 1997 filed with the Commission.
         (2)      Incorporated  by  reference  to  exhibit  3.2  filed  with the
                  Registrant's  Report on Form 10-Q for the fiscal quarter ended
                  June 30, 1997 filed with the Commission.
         (3)      Incorporated  by  reference  to exhibit no. 4.1 filed with the
                  Registrant's  Annual Report on Form 10-KSB for the fiscal year
                  ended December 31, 1995 filed with the Commission.
         (4)      Filed herewith.

                                      II-5

<PAGE>

ITEM 17.          UNDERTAKINGS.

         (a)      Rule 415

                  The undersigned registrant will:

                  (1)  File,  during  any  period  in which it  offers  or sells
securities, a post-effective amendment to this Registration Statement to include
any additional or changed material information on the plan of distribution.

                  (2) For determining  liability under the Securities Act, treat
each  such  post-effective  amendment  as a new  Registration  Statement  of the
securities  offered,  and the offering of the  securities at that time to be the
initial bona fide offering.

                  (3) File a post-effective  to remove from  registration any of
the securities that remain unsold at the end of the offering.

(h)      Request for Acceleration of Effective Date

         Insofar as indemnification for liabilities arising under the Securities
Act of 1933 (the "Act") may be permitted to directors,  officers and controlling
persons of the small business  issuer pursuant to the foregoing  provisions,  or
otherwise, the small business issuer has been advised that in the opinion of the
Securities and Exchange Commission such indemnification is against public policy
as expressed in the Act and is,  therefore,  unenforceable.  In the event that a
claim for  indemnification  against such liabilities  (other than the payment by
the small business issuer of expenses incurred or paid by a director, officer or
controlling person of the small business issuer in the successful defense of any
action, suit or proceeding) is asserted by such director, officer or controlling
person in connection with the securities being registered,  the registrant will,
unless in the opinion of its counsel the matter has been settled by  controlling
precedent,  submit to a court of appropriate  jurisdiction  the question whether
such  indemnification  by it is  against  public  policy  as  expressed  in  the
Securities Act and will be governed by the final adjudication of such issue.

         The undersigned registrant hereby undertakes that:

                  (1) For  purposes  of  determining  any  liability  under  the
         Securities  Act, the  information  omitted from the form of  prospectus
         filed as part of a  registration  statement in reliance  upon Rule 430A
         and  contained  in a form of  prospectus  filed by the  small  business
         issuer pursuant to Rule 424(b)(1) or (4) or 497(h) under the Securities
         Act shall be deemed to be part of this registration statement as of the
         time it was declared effective.

                  (2) For the purpose of  determining  any  liability  under the
         Securities Act, each  post-effective  amendment that contains a form of
         prospectus shall be deemed to be a new  registration  statement for the
         securities offered in the registration  statement,  and the offering of
         such  securities  at that time shall be deemed to be the  initial  bona
         fide offering thereof.

                                      II-6

<PAGE>
                                   SIGNATURES

         Pursuant  to the  requirements  of the  Securities  Act  of  1933,  the
Registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-3 and has duly caused this Registration
Statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized, in the City of New York, State of New York, on October 21, 1997.

                                              SHEFFIELD PHARMACEUTICALS, INC.
          

Dated:  October 21, 1997                      /S/ LOREN G. PETERSON
                                              -----------------------------
                                                  Loren G. Peterson
                                                  Chief Executive Officer

                       POWERS OF ATTORNEY AND SIGNATORIES

                  Pursuant to the requirements of the Securities Act of 1933, as
amended, this Registration Statement has been signed by the following persons in
the capacities and on the date indicated.  Each of the undersigned  officers and
directors of Sheffield  Pharmaceuticals,  Inc.  hereby  constitutes and appoints
Douglas  R.  Eger and Loren G.  Peterson  and each of them  singly,  as true and
lawful  attorneys-in-fact  and  agents  with  full  power  of  substitution  and
resubstitution,  for him in his name in any and all capacities,  to sign any and
all  amendments  (including  post-effective  amendments)  to  this  Registration
Statement and to file the same, with all exhibits  thereto,  and other documents
in connection  therewith,  with the  Securities  and Exchange  Commission and to
prepare  any and  all  exhibits  thereto,  and  other  documents  in  connection
therewith,  and to make any applicable state securities law or blue sky filings,
granting unto said  attorneys-in-fact and agents, full power and authority to do
and perform  each and every act and thing  requisite  or necessary to be done to
enable  Sheffield  Pharmaceuticals,  Inc. to comply with the  provisions  of the
Securities Act of 1933, as amended,  and all  requirements of the Securities and
Exchange  Commission,  as fully to all intents and purposes as he might or could
do in person,  hereby  ratifying and confirming all that said  attorneys-in-fact
and agents,  or their substitute or substitutes,  may lawfully do or cause to be
done by virtue hereof.

        SIGNATURE                         TITLE                      DATE
        ---------                         -----                      ----


/S/ DOUGLAS R. EGER                Director and Chairman      October 21, 1997
- ------------------------------
    Douglas R. Eger


/S/ LOREN G. PETERSON              Director and Chief         October 21, 1997
- ------------------------------     Executive Officer
         Loren G. Peterson


/S/ THOMAS FITZGERALD              Director, President and    October 21, 1997
- ------------------------------     Chief Operating Officer
         Thomas Fitzgerald


/S/ JOHN M. BAILEY                 Director                   October 21, 1997
- ------------------------------
         John M. Bailey


- ------------------------------     Director                   October __, 1997
         Digby W. Barrios


/S/ GEORGE LOMBARDI                Vice President, Chief      October 21, 1997
- ------------------------------     Financial Officer,
         George Lombardi           Treasurer and Secretary
                                   (Chief Financial and
                                   Chief Accounting Officer)


                                      II-7


                                              Exhibit 5.1 to
                                              Form S-3 Registration Statement



                     Olshan Grundman Frome & Rosenzweig LLP
                                 505 Park Avenue
                            New York, New York 10022
                                 (212) 753-7200



                                                              October 21, 1997


Securities and Exchange Commission
450 Fifth Street, N.W.
Judiciary Plaza
Washington, D.C.  20549

                     Re:  Sheffield Pharmaceuticals, Inc.
                          Registration Statement on Form S-3
                          ----------------------------------

Ladies and Gentlemen:

                  Reference  is made to the  Registration  Statement on Form S-3
dated October 21, 1997 (the "Registration  Statement") filed with the Securities
and  Exchange  Commission  by  Sheffield   Pharmaceuticals,   Inc.,  a  Delaware
corporation (the "Company"). The Registration Statement relates to the resale of
an aggregate of 2,893,334 shares (the "Shares") of Common Stock,  $.01 par value
("Common  Stock"),  of the Company  consisting of (i) 2,333,334 shares of Common
Stock  issuable upon  conversion of the  Company's 6%  Convertible  Subordinated
Debentures  due September 22, 2000 (the  "Debentures"),  (ii) 420,000  shares of
Common  Stock  issuable  in lieu of cash  interest on the  Debentures  and (iii)
140,000 shares of Common Stock issuable upon exercise of certain warrants issued
to the initial purchasers of the Debentures.

                  We  advise  you  that we have  examined  originals  or  copies
certified or otherwise  identified to our  satisfaction  of the  Certificate  of
Incorporation and By-laws of the Company and minutes of meetings of the Board of
Directors of the Company and such other documents,  instruments and certificates
of officers and representatives of the Company and public officials, and we have
made such examination of the law, as we have deemed appropriate as the basis for
the opinion hereinafter expressed.  In making such examination,  we have assumed
the genuineness of all signatures,  the authenticity of all documents  submitted
to us


<PAGE>

Securities and Exchange Commission
October 21, 1997
Page -2-

as originals, and the conformity to original documents of documents submitted to
us as certified or photostatic copies.

                  Based  upon  the  foregoing,  we are of the  opinion  that the
Shares,  when  issued  in  accordance  with  the  terms  and  conditions  of the
respective agreements or instruments  governing such issuance,  will be duly and
validly issued, fully paid and non-assessable.

                  We are  qualified to practice law in the State of New York and
we do not  purport to be experts on any laws other than the laws of the State of
New York, the General  Corporation  Law of the State of Delaware and the Federal
laws of the United States of America.

                  We consent  to the  reference  to this firm under the  caption
"Legal  Matters" in the prospectus that  constitutes a part of the  Registration
Statement.

                  We advise you that  Daniel J.  Gallagher,  an attorney of this
firm, holds options to purchase 15,000 shares of Common Stock.

                                     Very truly yours,


                                     /S/ OLSHAN GRUNDMAN FROME & ROSENZWEIG LLP
                                     ------------------------------------------
                                         OLSHAN GRUNDMAN FROME & ROSENZWEIG LLP


                                       -2-

                                                 EXHIBIT 10.1 TO
                                                 FORM S-3 REGISTRATION STATEMENT

"THESE  SECURITIES HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED (THE  "SECURITIES  ACT"), OR THE SECURITIES  LAWS OF ANY STATE,  AND ARE
BEING  OFFERED  AND  SOLD  PURSUANT  TO  AN  EXEMPTION  FROM  THE   REGISTRATION
REQUIREMENTS  OF THE SECURITIES ACT AND SUCH LAWS.  THESE  SECURITIES MAY NOT BE
SOLD OR TRANSFERRED EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER
THE SECURITIES ACT OR PURSUANT TO AN AVAILABLE  EXEMPTION FROM THE  REGISTRATION
REQUIREMENTS OF THE SECURITIES ACT OR SUCH OTHER LAWS."

                      6% CONVERTIBLE SUBORDINATED DEBENTURE
                             DUE SEPTEMBER 22, 2000

$_____________                                                SEPTEMBER 22, 1997

No. ___

         Sheffield Pharmaceuticals,  Inc., a Delaware corporation with principal
executive  offices  located at 30 Rockefeller  Plaza,  Suite 4515, New York, New
York 10112 (the  "Company"),  for value received,  hereby promises to pay to the
Holder (as defined below), or order, on September 22, 2000 (the "Maturity Date")
the  principal  sum of  ____________________  ($__________)  and to pay interest
thereon from the date of original  issuance (or the most recent interest payment
date to which interest has been paid),  quarterly in arrears,  on each March 31,
June 30,  September 30 and  December 31 of each year (each an "Interest  Payment
Due Date" and  collectively,  the "Interest  Payment Due Dates"),  commencing on
December 31, 1997, at the rate of 6% per annum (the "Debenture  Interest Rate"),
until  the  principal  of this  Debenture  has  been  paid  in full or duly  and
irrevocably  provided  for. The interest so payable on any Interest  Payment Due
Date shall be paid to the Person in whose name this  Debenture is  registered at
the close of business on the 15th day next  preceding  the  applicable  Interest
Payment  Due Date and all  interest  payable  on the  principal  amount  of this
Debenture shall be calculated on the basis of 360-day year for the actual number
of days elapsed. Interest shall be paid through the issuance of duly and validly
authorized and issued, fully paid and non-assessable, freely tradeable shares of
the Company's common stock valued at the Interest Market Price. The common stock
to be issued in lieu of cash interest payments shall be registered for resale in
the  Registration  Statement  to be filed by the Company to register  the Common
Stock issuable upon  conversion of the Debenture and exercise of the Warrants as
set forth in the Registration  Rights Agreement.  Notwithstanding the foregoing,
until  such  Registration  Statement  has  been  declared  effective  under  the
Securities  Act by the SEC,  payment of  interest on the  Debenture  shall be in
cash.


<PAGE>

                                    ARTICLE 1
                                   DEFINITIONS

         SECTION 1.1  DEFINITIONS.  The terms  defined in this Article  whenever
used in this Debenture have the following respective meanings:

                  (a)      "ADDITIONAL CAPITAL SHARES" has the meaning set
forth in Section 3.1(c).

                  (b) "AFFILIATE" has the meaning  ascribed to such term in Rule
12b-2 under the Securities Exchange Act of 1934, as amended.

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

                  (d) "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.

                  (e)  "CAPITAL  SHARES"  means the Common  Shares and any other
shares of any other class or series of common  stock,  whether now or  hereafter
authorized  and however  designated,  which have the right to participate in the
distribution   of  earnings  and  assets  (upon   dissolution,   liquidation  or
winding-up) of the Company.

                  (f) "CLOSING DATE" means September 22, 1997.

                  (g)  "COMMON  SHARES" or "COMMON  STOCK"  means  shares of the
common stock, $.01 par value, of the Company.

                  (h)  "COMMON  STOCK  ISSUED  AT  CONVERSION"  when  used  with
reference to the securities  issuable upon conversion of this  Debenture,  means
all Common Shares now or hereafter Outstanding and securities of any other class
or series  into  which the  Debenture  hereafter  shall  have  been  changed  or
substituted, whether now or hereafter created and however designated.

                  (i)  "COMPANY"  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
Company's assets, or otherwise.

                  (j) "COMPANY  CONVERSION  NOTICE" has the meaning set forth in
Section 3.3.

                  (k)  "CONVERSION  DATE"  means  any  day on  which  all or any
portion of the  principal  amount of this  Debenture is converted in  accordance
with the provisions hereof.


                                       -2-

<PAGE>
                  (l)  "CONVERSION  NOTICE" has the meaning set forth in Section
3.2.

                  (m) "CONVERSION PRICE" on any date of determination  means the
applicable price for the conversion of this Debenture into Common Shares on such
day as set forth in Section 3.1.

                  (n)  "CONVERSION  RATIO"  on any  date  means  the  applicable
percentage  of the Market Price for  conversion  of this  Debenture  into Common
Shares on such day as set forth in Section 3.1.

                  (o) "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 closing
price 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 Company for
that purpose,  or a price  determined in good faith by the Board of Directors of
the Company as being equal to the fair market value thereof, as the case may be.

                  (p)  "DEBENTURE"  means  this  6%  Convertible  Debenture  due
September  22,  2000 of the  Company or such  other  convertible  debentures  or
Debentures exchanged therefor as provided in Section 2.1.

                  (q) "DEFAULT  INTEREST  RATE" shall be equal to the  Debenture
Interest Rate plus an additional 4% per annum.

                  (r) "EVENT OF  DEFAULT"  has the  meaning set forth in Section
6.1.

                  (s)  "HOLDER"   means   ____________________,   any  successor
thereto,  or any Person to whom this  Debenture is  subsequently  transferred in
accordance with the provisions hereof.

                  (t) "INTEREST MARKET PRICE" per Common Share means the average
of the closing  prices of the Common Shares 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,

                                       -3-

<PAGE>
the closing bid price 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 Company for that purpose,  or a price  determined in good faith by the Board
of Directors of the Company, as being equal to the fair market value thereof, as
the case  may be,  for the ten  (10)  Trading  Days  immediately  preceding  the
applicable Interest Payment Due Date.

                  (u)  "INTEREST  PAYMENT DUE DATE" has the meaning set forth in
the opening paragraph hereof.

                  (v) "MARKET  DISRUPTION EVENT" means any event that results in
a material suspension or limitation of trading of Common Shares on AMEX.

                  (w) "MARKET  PRICE" per Common  Share means the average of the
closing  prices of the  Common  Shares  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 closing bid
price 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 Company for
that purpose,  or a price  determined in good faith by the Board of Directors of
the Company as being equal to the fair market value thereof, as the case may be,
for the five (5) Trading Days in any Valuation Period.

                  (x) "MAXIMUM RATE" has the meaning set forth in Section 6.3.

                  (y) "ORIGINAL  DEBENTURE"  means this  Debenture as originally
issued to the initial  holder  thereof,  ___________________,  in the  principal
amount of $180,000.

                  (z) "OUTSTANDING" when used with reference to Common Shares or
Capital Shares  (collectively,  "Shares"),  means, on any date of determination,
all issued and  outstanding  Shares,  and includes  all such Shares  issuable in
respect  of  outstanding  scrip  or  any  certificates  representing  fractional
interests in such Shares;  PROVIDED,  HOWEVER,  that any such Shares directly or
indirectly owned or held by or for the account of the Company or

                                       -4-

<PAGE>
any  Subsidiary  of the Company shall not be deemed  "Outstanding"  for purposes
hereof.

                  (aa)  "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.

                  (ab)  "REDEMPTION  EVENT" has the meaning set forth in Section
3.6.

                  (ac)  "REDEMPTION  PRICE" has the meaning set forth in Section
3.6.

                  (ad)  "REGISTRATION   RIGHTS  AGREEMENT"  means  that  certain
Registration  Rights  Agreement dated  September 22, 1997,  between the Company,
________________________ and __________________, as the same may be amended from
time to time.

                  (ae) "SEC" means the United  States  Securities  and  Exchange
Commission.

                  (af)  "SECURITIES  ACT" means the  Securities  Act of 1933, as
amended,  and the rules and regulations of the SEC thereunder,  all as in effect
at the time.

                  (ag)  "SECURITIES   PURCHASE  AGREEMENT"  means  that  certain
Securities  Purchase  Agreement  dated as of  September  22,  1997,  between the
Company,  ___________________  and  _____________________,  as the  same  may be
amended from time to time.

                  (ah) "_____________  ORIGINAL DEBENTURE" means the convertible
debenture  dated  September  22,  1997 issued to  ______________________  by the
Company in the principal amount of $_________.

                  (ai)  "SUBSIDIARY"  means any  entity of which  securities  or
other  ownership  interests  having ordinary voting power to elect a majority of
the board of directors or other persons  performing  similar functions are owned
directly or indirectly by the Company.

                  (aj) "TRADING DAY" means any day on which  purchases and sales
of securities  authorized for quotation on the AMEX are reported  thereon and on
which no Market  Disruption  Event has  occurred  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

                                       -5-

<PAGE>

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.

                  (ak)  "VALUATION  EVENT" has the  meaning set forth in Section
3.1.

                  (al) "VALUATION  PERIOD" means the five (5) Trading Day period
immediately  preceding  the  Conversion  Date or Interest  Payment Due Date,  as
applicable.

                  (am)  "WARRANT"  means the  warrant to purchase  Common  Stock
issued  by the  Company  to the  Holder  pursuant  to  the  Securities  Purchase
Agreement.

                  All  references to "cash" or "$" herein means  currency of the
United States of America.


                                    ARTICLE 2
                             EXCHANGES AND TRANSFER

         SECTION 2.1 EXCHANGE AND  REGISTRATION  OF TRANSFER OF DEBENTURES.  The
Holder may, at its option,  surrender this Debenture at the principal  executive
offices  of the  Company  and  receive  in  exchange  therefor  a  Debenture  or
Debentures,  each in the denomination of $10,000 or integral multiples of $1,000
in excess  thereof,  dated as of the date of this  Debenture,  and,  subject  to
Section  4.3,  payable  to such  Person  or order as may be  designated  by such
Holder. The aggregate principal amount of the Debenture or Debentures  exchanged
in accordance with this Section 2.1 shall equal the aggregate  unpaid  principal
amount of this Debenture as of the date of such  surrender;  PROVIDED,  HOWEVER,
that upon any  exchange  pursuant to this  Section 2.1 there shall be filed with
the  Company  the name and  address  for all  purposes  hereof of the  Holder or
Holders  of the  Debenture  or  Debentures  delivered  in  such  exchange.  This
Debenture,  when  presented  for  registration  of transfer  or for  exchange or
conversion,  shall (if so  required  by the  Company)  be duly  endorsed,  or be
accompanied by a written instrument of transfer in form reasonably  satisfactory
to the Company duly executed, by the Holder duly authorized in writing.

                                       -6-

<PAGE>
         SECTION 2.2 LOSS,  THEFT,  DESTRUCTION  OF  DEBENTURE.  Upon receipt of
evidence  satisfactory  to  the  Company  of the  loss,  theft,  destruction  or
mutilation  of this  Debenture  and,  in the  case of any  such  loss,  theft or
destruction,  upon receipt of indemnity or security  reasonably  satisfactory to
the  Company,  or,  in the  case of any  such  mutilation,  upon  surrender  and
cancellation of this Debenture,  the Company shall make,  issue and deliver,  in
lieu of such lost, stolen,  destroyed or mutilated Debenture, a new Debenture of
like  tenor  and  unpaid  principal  amount  dated as of the date  hereof.  This
Debenture shall be held and owned upon the express condition that the provisions
of  this  Section  2.2  are  exclusive  with  respect  to the  replacement  of a
mutilated,  destroyed,  lost or stolen  Debenture and shall preclude any and all
other  rights  and  remedies  notwithstanding  any law or  statute  existing  or
hereafter  enacted to the contrary with respect to the replacement of negotiable
instruments or other securities without the surrender thereof.

         SECTION 2.3 WHO DEEMED ABSOLUTE OWNER.  The Company may deem the Person
in whose name this Debenture  shall be registered upon the registry books of the
Company  to be,  and may  treat it as,  the  absolute  owner  of this  Debenture
(whether or not this  Debenture  shall be overdue)  for the purpose of receiving
payment of or on  account of the  principal  amount of this  Debenture,  for the
conversion of this Debenture and for all other  purposes,  and the Company 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 this  Debenture to the extent of the sum or sums so paid or the  conversion
so made.

         SECTION 2.4 REPAYMENT AT MATURITY.  At the Maturity  Date,  the Company
shall repay the  outstanding  principal  amount of this  Debenture in whole (but
only with  respect  to such  principal  amount as to which  the  Holder  has not
theretofore furnished a Conversion Notice in compliance with Section 3.2) at one
hundred  percent  (100%) of the  principal  amount  thereof,  together  with all
accrued and unpaid interest thereon, in cash, to the Maturity Date.


                                    ARTICLE 3
                             CONVERSION OF DEBENTURE

         SECTION 3.1 CONVERSION;  CONVERSION PRICE. At the option of the Holder,
this  Debenture  may be  converted,  either in whole or in part,  up to the full
principal amount hereof (in increments of not less than $5,000 principal amount)
into Common Shares (calculated as to each such conversion to the nearest 1/100th
of a share),  at any  time,  and from time to time  after  the one  hundred  and
fiftieth  (150th) day following the Closing Date,  subject to the limitations in
the next sentence. During each of

                                       -7-

<PAGE>

the periods from the  ninety-first  (91st) day to the one hundred and  twentieth
(120th) day and from the one hundred  and twenty-first  (121st)  day  to the one
hundred and fiftieth  (150th) day  following  the Closing Date, at the option of
the Holder,  up to five percent  (5%) of this  Debenture  may be  converted  (in
increments  of not  less  than  $5,000  principal  amount)  into  Common  Shares
(calculated as to each such conversion to the nearest  1/100th of a share).  The
number of Common  Shares into which this  Debenture may be converted is equal to
(x) the principal  amount of the Debenture  being  converted for the  applicable
Valuation  Period,  at the Conversion  Date divided by (y) the Conversion  Price
(plus at the  option of the  Holder,  any  accrued  and unpaid  interest  on the
Debenture being converted  through the Conversion  Date).  The Conversion  Price
shall be equal to  seventy-five  percent  (75%) of the Market  Price;  PROVIDED,
HOWEVER, that the Holder shall not have the right to convert any portion of this
Debenture  to the extent that the  issuance to the Holder of Common  Shares upon
such conversion  would result in the Holder being deemed the "beneficial  owner"
of 5% or more of the then  outstanding  Common Shares within the meaning of Rule
13d-3 of the Securities Exchange Act of 1934, as amended; and PROVIDED, FURTHER,
that such  limitation  shall no longer be effective as of the 10th day following
(i) an Event of Default and (ii) the delivery of a notice from the Holder to the
Company that the Company is in material breach of any of its  obligations  under
this Debenture,  the Securities  Purchase  Agreement,  the  Registration  Rights
Agreement or the Warrant;  and PROVIDED,  FURTHER that the Company shall have no
obligation to determine  whether or not the Holder is the "beneficial  owner" of
5% or more of the outstanding  Common Stock in connection with any conversion of
this Debenture.  Notwithstanding  the previous  sentence,  in no event shall the
Holder  have the right to convert any  portion of this  Debenture  to the extent
that the  issuance  to the Holder of Common  Shares upon such  conversion,  when
combined with shares of Common Stock received upon conversion (x) by such Holder
and any other holders of convertible  debentures  issued in exchange for or upon
transfer of the Original Debenture and (y) by the holder of the ________________
Original  Debenture and any other holders of  convertible  debentures  issued in
exchange for or upon transfer of the _________  Original  Debenture would exceed
19.99% of the Common  Stock  outstanding  on the Closing  Date.  Within ten (10)
Business  Days of the  receipt of the  Conversion  Notice (as defined in Section
3.2) which upon  conversion  would,  when  combined  with shares of Common Stock
received  upon  other  conversions  by such  Holder  and any  other  holders  of
convertible  debentures issued in exchange for or upon transfer of, the Original
Debenture exceed 19.99% of the Common Stock outstanding on the Closing Date, the
Company  shall  redeem this  Debenture  in whole (but only with  respect to such
principal  amount  as to  which  the  Holder  has not  theretofore  furnished  a
Conversion  Notice in  compliance  with  Section 3.2) at one hundred and fifteen
percent (115%) of the

                                       -8-

<PAGE>
principal amount thereof, together with all accrued and unpaid interest thereon,
in cash, to the date of redemption.

                  Within two (2) Business Days of the  occurrence of a Valuation
Event,  the Company  shall send notice (the  "Valuation  Event  Notice") of such
occurrence  to the Holder.  Notwithstanding  anything to the contrary  contained
herein, if a Valuation Event occurs during any Valuation Period, a new Valuation
Period shall begin on the Trading Day  immediately  following the  occurrence of
such Valuation Event and end on the Conversion  Date;  PROVIDED,  HOWEVER,  if a
Valuation  Event  occurs  on the  fifth day of any  Valuation  Period,  then the
Conversion  Price shall be the Current Market Price of the Common Shares on such
day; and PROVIDED,  FURTHER,  that the Holder may, in its  discretion,  postpone
such  Conversion  Date to a Trading  Day which is no more than five (5)  Trading
Days  after  the  occurrence  of the  latest  Valuation  Event by  delivering  a
notification  (the  "Postponement  Notification")  to the Company within two (2)
Business  Days of the receipt of the Valuation  Event Notice.  In the event that
the Holder,  in  accordance  with the  preceding  sentence,  deems the Valuation
Period  to be other  than the five (5)  Trading  Days  immediately  prior to the
Conversion  Date,  the  Holder  shall  give  written  notice of such fact to the
Company in the related Conversion Notice at the time of conversion.

For purposes of this  Section  3.1, a  "VALUATION  EVENT" shall mean an event in
which  the  Company  at any time  during a  Valuation  Period  takes  any of the
following actions:

                  (a)      subdivides or combines its Capital Shares;

                  (b) pays a dividend in its  Capital  Shares or makes any other
distribution of cash or property on its Capital Shares;

                  (c) issues any  additional  Capital  Shares  (the  "Additional
Capital  Shares"),  otherwise than as provided in the foregoing  Sections 3.1(a)
and 3.1(b) above, at a price per share less, or for other  consideration  lower,
than the Current Market Price in effect immediately prior to such issuances,  or
without  consideration,  except for the  issuance of (i) Common  Stock and other
securities  of the Company  issuable upon the exercise or conversion of options,
warrants on other rights to purchase  securities of the Corporation  outstanding
as of the date hereof and (ii) securities to officers, directors or employees of
the Company or any of its subsidiaries.

                  (d) issues any warrants,  options or other rights to subscribe
for or purchase any Additional  Capital Shares and the price per share for which
Additional  Capital  Shares may at any time  thereafter be issuable  pursuant to
such  warrants,  options or other rights  shall be less than the Current  Market
Price in effect immediately prior to such issuance; except for the

                                       -9-

<PAGE>
issuance of (i) Common Stock and other  securities of the Company  issuable upon
the  exercise or  conversion  of options,  warrants on other  rights to purchase
securities  of the  Corporation  outstanding  as of the  date  hereof  and  (ii)
securities  to  officers,  directors  or  employees of the Company or any of its
subsidiaries.

                  (e) issues any securities  convertible into or exchangeable or
exercisable  for  Capital  Shares  and the  consideration  per  share  for which
Additional Capital Shares may at any time thereafter be issuable pursuant to the
terms of such convertible,  exchangeable or exercisable securities shall be less
than the  Current  Market  Price in effect  immediately  prior to such  issuance
except for the issuance of (i) Common Stock and other  securities of the Company
issuable upon the exercise or conversion of options, warrants on other rights to
purchase  securities of the  Corporation  outstanding  as of the date hereof and
(ii) securities to officers, directors or employees of the Company or any of its
subsidiaries.

                  (f)  makes  a  distribution  of its  assets  or  evidences  of
indebtedness  to the holders of its Capital  Shares as a dividend in liquidation
or by way of  return of  capital  or other  than as a  dividend  payable  out of
earnings  or  surplus  legally  available  for the  payment of  dividends  under
applicable law or any  distribution  to such holders made in respect of the sale
of all or  substantially  all of the  Company's  assets  (other  than  under the
circumstances  provided for in the foregoing  Sections  3.1(a) through  3.1(e)),
PROVIDED, in each case, that such distribution  described in this Section 3.1(f)
does not constitute an Event of Default; or

                  (g) takes  any  action  affecting  the  number of  Outstanding
Capital Shares,  other than an action described in any of the foregoing Sections
3.1(a) through 3.1(f) hereof,  inclusive,  which in the opinion of the Company's
Board of  Directors,  determined  in good faith,  would have a material  adverse
effect  upon  the  rights  of the  Holder  at the time of a  conversion  of this
Debenture.

         SECTION 3.2 EXERCISE OF CONVERSION  PRIVILEGE.  (a)  Conversion of this
Debenture may be exercised, in whole or in part, by the Holder by telecopying an
executed  and  completed  notice of  conversion  in the form  annexed  hereto as
Exhibit A (the  "Conversion  Notice")  to the  Company and sending a copy of the
Conversion  Notice and this  Debenture to the Company by  nationally  recognized
overnight  courier not later than five (5) Business Days next following the date
on which the telecopied  Conversion  Notice has been transmitted to the Company.
Each date on which a  Conversion  Notice is  telecopied  to and  received by the
Company in accordance with the provisions of this Section 3.2 shall constitute a
Conversion Date. The Company shall convert the

                                      -10-

<PAGE>

Debenture  and issue the Common Stock Issued at  Conversion  effective as of the
Conversion Date. The Conversion  Notice also shall state the name or names (with
addresses)  of the  persons  who are to become the  holders of the Common  Stock
Issued at Conversion in connection with such  conversion,  subject to compliance
with Section 4.3, as applicable.  Upon surrender for conversion,  this Debenture
shall be accompanied by a proper assignment hereof to the Company or be endorsed
in blank. As promptly as practicable  after the receipt of the Conversion Notice
and the surrender of this Debenture as aforesaid, but in any event not more than
five (5) Business Days after the Company's receipt of such Conversion Notice and
surrender of this Debenture, the Company shall (i) issue the Common Stock issued
at  Conversion  in  accordance  with the  provisions of this Article 3, and (ii)
cause to be mailed  for  delivery  by  overnight  courier  to the  Holder  (X) a
certificate or certificate(s)  representing the number of Common Shares to which
the Holder is entitled by virtue of such  conversion,  (Y) cash,  as provided in
Section 3.3, in respect of any fraction of a Share issuable upon such conversion
and (Z) cash or shares of Common Stock, as applicable,  representing  the amount
of accrued  and unpaid  interest  on the  Debenture  being  converted  as of the
Conversion  Date. Such  conversion  shall be deemed to have been effected at the
time at which the Conversion  Notice  indicates so long as this Debenture  shall
have been  surrendered as aforesaid at such time, and at such time the rights of
the Holder of this Debenture, as such, shall cease and the Person and Persons in
whose name or names the Common  Stock  Issued at  Conversion  shall be  issuable
shall be deemed to have  become  the  holder or  holders of record of the Common
Shares  represented  thereby.  The Conversion Notice shall constitute a contract
between  the  Holder and the  Company,  whereby  the  Holder  shall be deemed to
subscribe  for the number of Common  Shares which it will be entitled to receive
upon such conversion and, in payment and satisfaction of such  subscription (and
for any cash  adjustment  to which it is entitled  pursuant to Section  3.4), to
surrender this Debenture and to release the Company from all liability  thereon.
No cash payment aggregating less than $1.50 shall be required to be given unless
specifically requested by the Holder.

         (b) If, at any time after the date of this  Debenture,  (i) the Company
challenges,  disputes  or denies  the right of the  Holder  hereof to effect the
conversion  of this  Debenture  into Common  Shares or  otherwise  dishonors  or
rejects any Conversion  Notice  delivered in accordance with this Section 3.2 or
(ii) any third  party who is not and has never been an  Affiliate  of the Holder
commences any lawsuit or legal proceeding or otherwise  asserts any claim before
any court or public or governmental  authority  which seeks to challenge,  deny,
enjoin, limit, modify, delay or dispute the right of the Holder hereof to effect
the conversion of this Debenture into Common Shares,  then the Holder shall have
the right, by written notice to the Company, to

                                      -11-

<PAGE>
require the Company to promptly  redeem this  Debenture for cash at a redemption
price equal to one  hundred  and  twenty-five  percent  (125%) of the  principal
amount  hereof  together  with all  accrued  and unpaid  interest  thereon  (the
"Mandatory  Purchase  Amount").  Under any of the circumstances set forth above,
the Company  shall be  responsible  for the payment of all costs and expenses of
the Holder,  including reasonable legal fees and expenses,  as and when incurred
in  defending  itself in any such action or pursuing  its rights  hereunder  (in
addition to any other rights of the Holder).

         SECTION 3.3  FRACTIONAL  SHARES.  No fractional  Common Shares or scrip
representing  fractional  Common Shares shall be issued upon  conversion of this
Debenture.  Instead of any  fractional  Common Shares which  otherwise  would be
issuable  upon  conversion  of this  Debenture,  the  Company  shall  pay a cash
adjustment  in respect of such  fraction in an amount equal to the same fraction
multiplied by the Current Market Price on the  Conversion  Date. No cash payment
of less than $1.50 shall be required to be given unless  specifically  requested
by the Holder.

         SECTION 3.4 ADJUSTMENTS.  The Conversion Price and the number of shares
issuable upon  conversion of this Debenture are subject to adjustment  from time
to time as follows.

                  (a)  MERGER,  SALE OF ASSETS,  ETC.  If at any time while this
Debenture,  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  Company  with or into  another  corporation  in which the
Company is the surviving  entity but the shares of the  Company'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 Company'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 this Debenture,  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 this  Debenture had been  converted
immediately before such reorganization, merger, consolidation, sale or transfer,
all subject to further adjustment as provided in this Section 3.4. The foregoing
provisions   of  this   Section  3.4  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

                                      -12-

<PAGE>
than cash or marketable  securities,  then the value of such consideration shall
be determined in good faith by the Company's Board of Directors.  In all events,
appropriate  adjustment (as  determined in good faith by the Company's  Board of
Directors)  shall be made in the application of the provisions of this Debenture
with respect to the rights and interests of the Holder after the transaction, to
the end that the  provisions  of the Debenture  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 this Debenture.

                  (b)  RECLASSIFICATION,  ETC. If the Company, at any time while
this Debenture, or any portion thereof, remains outstanding, shall change any of
the securities as to which conversion rights under this Debenture exist into the
same or a different  number of  securities  of any other class or classes,  this
Debenture 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
Debenture  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 Section 3.4.

                  (c)  SPLIT,  SUBDIVISION  OR  COMBINATION  OF  SHARES.  If the
Company  at any time while  this  Debenture,  or any  portion  thereof,  remains
outstanding  shall  split,  subdivide  or  combine  the  securities  as to which
purchase  rights  under  this  Debenture  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 this Debenture,  or any portion hereof,  remains outstanding,
the holders of the securities as to which  purchase  rights under this Debenture
exist at the time shall have received, or, on or after the record date fixed for
the  determination  of eligible  stockholders of the Company,  shall have become
entitled to receive,  without  payment  therefor,  other or additional  stock or
other  securities  or  property  (other  than  cash)  of the  Company  by way of
dividend,  then and in each case,  this Debenture  shall  represent the right to
acquire,  upon  conversion,  in addition to the number of shares of the security
receivable  upon  conversion  of this  Debenture,  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 Company 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 this Debenture on the date hereof and
had thereafter, during the period from the date hereof

                                      -13-

<PAGE>
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 3.4.

                  (e) CERTIFICATE AS TO ADJUSTMENTS. Upon the occurrence of each
adjustment  or  readjustment  pursuant to this  Section  3.4, the Company 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.

         SECTION 3.5 [Reserved].

         SECTION 3.6 MANDATORY REDEMPTION UNDER CERTAIN CIRCUMSTANCES.  Upon the
occurrence  of a Redemption  Event (the  "Redemption  Date"),  the Company shall
redeem this  Debenture  (but only with  respect to such  principal  amount as to
which the Holder has not theretofore furnished a Conversion Notice in compliance
with  Section  3.2),  at one  hundred  and  twenty-five  percent  (125%)  of the
principal amount thereof (the "Redemption Price"), together with all accrued and
unpaid interest  thereon,  in cash, to the Redemption  Date. A Redemption  Event
shall be deemed to have  occurred upon the  occurrence of any of the  following:
(i) the sale,  lease,  transfer,  conveyance or other  disposition,  in one or a
series of related transactions, of all or substantially all of the assets of the
Company  and its  subsidiaries  taken as a whole to any Person or group (as such
term is used in Section 13(d)(3) and 14(d)(2) of the Securities  Exchange Act of
1934,  as  amended)  other  than  to a  Person  or  group  who,  prior  to  such
transaction,  held a  majority  of the voting  power of the voting  stock of the
Company,  (ii) the  acquisition  by any Person or group of a direct or  indirect
interest  in more than fifty  percent  (50%) of the  voting  power of the voting
stock of the Company,  by way of merger or consolidation or otherwise,  on (iii)
the first day on which the  majority of the members of the Board of Directors of
the Company are not Continuing Directors.  Continuing Directors means, as of any
date or  determination,  any member of the Board of Directors of the Company who
(i) was a member of such Board of  Directors  on the date of this  Debenture  or
(ii) was nominated  for election or elected to such Board of Directors  with the
approval  of a majority of the  Continuing  Directors  who were  members of such
Board at the time of such nomination or election. In addition, the Company shall
redeem this  Debenture  (but only with  respect to such  principal  amount as to
which the Holder has not theretofore furnished a Conversion Notice in compliance
with Section  3.2) at one hundred and fifteen  percent  (115%) of the  principal
amount thereof,  together with all accrued and unpaid interest thereon, in cash,
to the  Redemption  Date upon the  issuance  or sale by the  Company  of debt or
equity securities of the Company in one or a series of related transactions

                                      -14-

<PAGE>

aggregating at least $6,000,000 in gross proceeds;  PROVIDED,  HOWEVER, that the
Company  shall  not issue or sell a lesser  amount of debt or equity  securities
with the intention of avoiding this redemption obligation.

         SECTION 3.7 OPTIONAL REDEMPTION.  At any time on or prior to a date one
hundred and fifty (150) days after the Closing  Date,  the Company,  upon notice
delivered to the Holder as provided in Section 3.8, may redeem this Debenture in
whole or in part (but only with respect to such principal amount as to which the
Holder has not  theretofore  furnished a Conversion  Notice in  compliance  with
Section  3.2),  at the  Redemption  Price,  together with all accrued and unpaid
interest thereon to the Redemption Date.  During the period commencing on a date
one hundred and  fifty-one  (151) days  following the Closing Date and ending on
the  Maturity  Date,  the Company may only redeem this  Debenture in whole or in
part at the  Redemption  Price,  together  with all accrued and unpaid  interest
thereon (but only with respect to such  principal  amount as to which the Holder
has not  theretofore  furnished a Conversion  Notice in compliance  with Section
3.2),  so long as the Current  Market Price on the date of  redemption is not in
excess of one hundred and thirty  percent  (130%) of the Current Market Price on
the Closing Date. Except as set forth in Sections 3.1, 3.2, 3.6 and this Section
3.7, the Company shall not have the right to prepay or redeem this Debenture.

         SECTION  3.8  NOTICE  OF  REDEMPTION.  Notice of  mandatory  redemption
pursuant to Sections  3.1,  3.6 or optional  redemption  pursuant to Section 3.7
shall be provided by the Company to the Holder in writing at the  Holder's  last
address  appearing  in the  Company's  security  registry not less than ten (10)
Business  Days  prior  to  the  Redemption   Date,  which  notice  shall  be  in
substantially  the form of Exhibit B hereto,  specify  the  Redemption  Date and
refer to Sections 3.1, 3.6 or 3.7, as applicable,  (including a statement of the
Redemption Price) and this Section 3.8.

         SECTION  3.9  SURRENDER  OF  DEBENTURES.  Upon any  redemption  of this
Debenture  pursuant to Sections  3.2, 3.6 or 3.7, or upon  maturity  pursuant to
Section  2.4, the Holder  shall  either  deliver  this  Debenture by hand to the
Company at its principal  executive offices or surrender the same to the Company
at such  address by  nationally  recognized  overnight  courier.  Payment of the
Mandatory  Purchase  Amount  specified  in Section  3.2,  the  Redemption  Price
specified  in  Sections  3.6 or 3.7 or the amount due on maturity  specified  in
Section 2.4, shall be made by the Company to the Holder against  receipt of this
Debenture  (as  provided in this Section  3.9) by wire  transfer of  immediately
available funds to such account(s) as the Holder shall specify by written notice
to the Company.  If payment of such Redemption  Price is not made in full by the
Redemption  Date,  or the  amount  due on  maturity  is not  paid in full by the
Maturity Date, the

                                      -15-

<PAGE>
Holder  shall  again have the right to convert  this  Debenture  as  provided in
Article 3 hereof or to declare an Event of Default.


                                    ARTICLE 4
                 STATUS; SUBORDINATION; RESTRICTIONS ON TRANSFER

         SECTION  4.1  STATUS  OF  DEBENTURE.  This  Debenture  is an  unsecured
obligation of the Company, and constitutes a legal, valid and binding obligation
of the  Company,  enforceable  in  accordance  with  its  terms  subject,  as to
enforceability, to general principles of equity and to principles of bankruptcy,
insolvency,  reorganization  and other  similar  laws of  general  applicability
relating to or affecting creditors' rights and remedies generally.

         SECTION 4.2 SUBORDINATION.  The Company, for itself, its successors and
assigns,  covenants and agrees,  and the Holder of this Debenture  covenants and
agrees, that the indebtedness evidenced by this Debenture,  shall be subordinate
in  liquidation  and  subject in right of payment in  liquidation,  to the prior
payment of all Senior Indebtedness of the Company.  For purposes of this Section
4.2,  "Senior  Indebtedness"  shall mean the principal or, premium,  if any, and
interest  (including  any  interest  accruing  after the filing of a petition in
bankruptcy) on and other amounts due on or in connection  with any  indebtedness
of the  Company as defined in an arising  under any loan,  credit,  security  or
similar agreement with a bank, insurance company, or other financial institution
or affiliate outstanding on the date of this Debenture, or any such indebtedness
thereafter created, incurred, assumed, or guaranteed by the Company, and in each
case, all renewals, extensions, and refunding thereof, which by the terms of the
instrument creating or evidencing such indebtedness created, incurred,  assumed,
or guaranteed is expressly made senior to in right of payment to, the payment of
principal or and interest on this Debenture.

         SECTION 4.3  RESTRICTIONS ON TRANSFER.  This Debenture,  and any Common
Shares issuable upon the conversion thereof,  have not been registered under the
Securities Act. The Holder by accepting this Debenture agrees that the Debenture
and the shares of Common Stock to be acquired as interest on and upon conversion
of this Debenture may not be assigned or otherwise  transferred unless and until
(i) the  Company  has  received  the  opinion of counsel for the Holder that the
Debenture or such shares may be sold pursuant to an exemption from  registration
under the  Securities Act of 1933, as amended (the  "Securities  Act") or (ii) a
registration  statement  relating to the Debenture or such shares has been filed
by the Company and declared effective by the SEC.

         Each  certificate  for shares of Common Stock issuable  hereunder shall
bear a legend as follows unless and until such

                                      -16-

<PAGE>
securities have been sold pursuant to an effective  registration statement under
the Securities Act:

         "The  securities   represented  by  this   certificate  have  not  been
         registered under the Securities Act of 1933 (the "Act"). The securities
         may not be offered for sale, sold or otherwise  transferred  except (i)
         pursuant to an effective  registration  statement under the Act or (ii)
         pursuant to an exemption from registration  under the Act in respect of
         which the Company has  received an opinion of counsel  satisfactory  to
         the Company to such effect.  Copies of the agreement  covering both the
         purchase  of the  securities  and  restricting  their  transfer  may be
         obtained at no cost by written  request made by the holder of record of
         this  certificate  to the  Secretary  of the  Company at the  principal
         executive offices of the Company."


                                    ARTICLE 5
                                    COVENANTS

         The Company  covenants and agrees that so long as this Debenture  shall
be outstanding:

         SECTION  5.1  CONVERSION.  The  Company  shall not later  than five (5)
Business Days after its receipt of the Conversion  Notice and its receipt of the
Debenture accompanied by a proper assignment or endorsement in blank pursuant to
Section  3.2,  issue and  deliver to the Holder the  requisite  shares of common
stock issuable upon conversion, according to the terms hereof.

         SECTION  5.2 NOTICE OF DEFAULT.  If any one or more events  occur which
constitute or which,  with notice,  lapse of time, or both,  would constitute an
Event of Default, or if the Holder shall demand the issuance of Common Shares or
take any  other  action  permitted  upon  the  occurrence  of any such  Event of
Default,  the Company shall forthwith give notice to the Holder,  specifying the
nature and status of the Event of  Default or other  event or of such  demand or
action, as the case may be.

         SECTION 5.3 PAYMENT OF  OBLIGATIONS.  Prior to conversion of the entire
principal amount of this Debenture,  the Company shall pay, extend, or discharge
at or before maturity,  all its respective material obligations and liabilities,
including,  without  limitation,  tax liabilities,  except where the same may be
contested in good faith by appropriate proceedings.

         SECTION 5.4  COMPLIANCE  WITH LAWS.  The Company  shall comply with all
applicable   laws,   ordinances,   rules,   regulations,   and  requirements  of
governmental  authorities,  except for such noncompliance which would not have a
material adverse effect on

                                      -17-

<PAGE>
the  business,  properties,  prospects,  condition  (financial  or otherwise) or
results of operations of the Company.

         SECTION 5.5  INSPECTION  OF PROPERTY,  BOOKS AND  RECORDS.  The Company
shall keep proper  books of record and  account in which full,  true and correct
entries shall be made of all material  dealings and  transactions in relation to
its business and  activities and shall permit  representatives  of the Holder at
the Holder's expense to visit and inspect any of its respective  properties,  to
examine and make  abstracts from any of its  respective  books and records,  not
reasonably  deemed  confidential  by the Company,  and to discuss its respective
affairs,  finances and accounts  with its  respective  officers and  independent
public accountants,  all at such reasonable times and as often as may reasonably
be desired.


                                    ARTICLE 6
                                    REMEDIES

         SECTION 6.1 EVENTS OF DEFAULT.  "EVENT OF DEFAULT" wherever used herein
means any one of the following events:

                  (a) the Company  shall  default in the payment of principal of
or interest on this Debenture as and when the same shall be due and payable and,
in the case of an interest payment default, such default shall continue for five
Business Days after the date such interest payment was due, or the Company shall
fail  to  perform  or  observe  in any  material  respect  any  other  covenant,
agreement, term, provision,  undertaking or commitment under this Debenture, the
Warrant,  the Securities Purchase Agreement or the Registration Rights Agreement
and such default shall continue for a period of ten (10) Business Days after the
delivery  to the  Company  of  written  notice  that the  Company  is in default
hereunder; or

                  (b)  any of the  representations  or  warranties  made  by the
Company herein, the Securities Purchase Agreement, the Warrant, the Registration
Rights Agreement or in any certificate or financial or other written  statements
heretofore  or hereafter  furnished by or on behalf of the Company in connection
with the execution and delivery of this Debenture,  the Warrant,  the Securities
Purchase  Agreement  or the  Registration  Rights  Agreement  shall  be false or
misleading in any material respect on the Closing Date; or

                  (c)  the  entry  of  a  decree  or  order  by a  court  having
jurisdiction in the premises  adjudging the Company or any subsidiary a bankrupt
or insolvent,  or approving as properly filed a petition seeking reorganization,
arrangement, adjustment or composition of or in respect of the Company under the
United States Bankruptcy Code of 1978, as amended (the "Bankruptcy

                                      -18-

<PAGE>
Code"), or any other applicable  Federal or state law, or appointing a receiver,
liquidator, assignee, trustee or sequestrator (or other similar official) of the
Company or of any substantial  part of its property,  or ordering the winding-up
or  liquidation  of its affairs,  and any such decree or order  continues and is
unstayed and in effect for a period of sixty (60) calendar days; or

                  (d)  the  institution  by the  Company  or any  Subsidiary  of
proceedings to be  adjudicated a bankrupt or insolvent,  or the consent by it to
the  institution  of  bankruptcy or  insolvency  proceedings  against it, or the
filing by it of a petition or answer or consent seeking reorganization or relief
under the Bankruptcy Code or any other  applicable  federal or state law, or the
consent  by it to the filing of any such  petition  or to the  appointment  of a
receiver,  liquidator,  assignee,  trustee  or  sequestrator  (or other  similar
official)  of the Company or of any  substantial  part of its  property,  or the
making by it of an assignment for the benefit of creditors,  or the admission by
it in  writing  of its  inability  to pay its debts  generally  as and when they
become due, or the taking of corporate  action by the Company in  furtherance of
any such action; or

                  (e) a final  judgment  or final  judgments  for the payment of
money shall have been entered by any court or courts of  competent  jurisdiction
against  the  Company  and  remains  undischarged  for a  period  (during  which
execution  shall be effectively  stayed) of thirty (30) days,  provided that the
aggregate  amount of all such judgments at any time  outstanding  (to the extent
not paid or to be paid, as evidenced by a written  communication  to that effect
from the applicable insurer, by insurance) exceeds $200,000; or

                  (f) it becomes  unlawful  for the Company to perform or comply
with its obligations under this Debenture,  the Securities Purchase Agreement or
the Registration Rights Agreement in any material respect; or

                  (g) the Common  Shares  shall be  delisted  from the AMEX (the
"Trading  Market,"  or, to the extent the Company  becomes  eligible to list its
Common Stock on The New York Stock  Exchange or Nasdaq  National  Market System,
upon official notice of listing on any such exchange or system,  as the case may
be, it shall be the "Trading  Market") or suspended  from trading on the Trading
Market, and shall not be reinstated,  relisted or such suspension lifted, as the
case may be, within ten (10) days; or

                  (h) the Company shall default (giving effect to any applicable
grace period) in the payment of principal or interest as and when the same shall
become  due  and  payable,  under  any  indebtedness,  individually  or  in  the
aggregate, of more than $200,000.

                                      -19-

<PAGE>
         SECTION 6.2 ACCELERATION OF MATURITY;  RESCISSION AND ANNULMENT.  If an
Event of  Default  occurs  and is  continuing,  then and in every  such case any
Holder may rescind any outstanding  Conversion Notice and obtain payment for the
entire outstanding  principal amount of the Debenture which remains unconverted,
by a notice in writing to the Company,  and upon any such declaration the entire
principal  amount of this Debenture shall become  immediately due and payable by
virtue  of such  rescission;  PROVIDED,  HOWEVER,  in the  case of any  Event of
Default  described  in  paragraphs  (c),  (d)  or (f)  above,  the  entire  then
outstanding  principal  amount of this Debenture,  together with all accrued and
unpaid interest thereon,  automatically shall become immediately due and payable
without the necessity of any notice or declaration as aforesaid.

         SECTION 6.3 DEFAULT  INTEREST RATE. (a) If any portion of the principal
of or  interest  on the  Debenture  shall not be paid when due  (whether  at the
stated maturity, by acceleration or otherwise) such principal of and interest on
the Debenture  which is due and owing but not paid shall,  without  limiting the
Holder's rights under this Debenture, bear interest at the Default Interest Rate
until paid in full.

                  (b) Notwithstanding anything herein to the contrary, if at any
time the  applicable  interest  rate as  provided  for herein  shall  exceed the
maximum lawful rate which may be contracted for,  charged,  taken or received by
the  Lender in  accordance  with  applicable  laws of the State of New York (the
"Maximum  Rate"),  the rate of interest  applicable  to the  Debenture  shall be
limited to the Maximum Rate.

         SECTION  6.4  REMEDIES  NOT  WAIVED.  No course of dealing  between the
Company and the Holder or any delay in  exercising  any rights  hereunder  shall
operate as a waiver by the Holder.

         SECTION  6.5 WAIVER.  No  recourse  shall be had for the payment of the
principal of, or the interest on, this Debenture, or for any claim based hereon,
or otherwise in respect hereof, against any incorporator,  shareholder,  officer
or director,  as such, past,  present or future, of the Company or any successor
corporation,  whether by virtue of any constitution,  statute or rule of law, or
by the enforcement of any assessment or penalty or otherwise, all such liability
being, by the acceptance  hereof and as part of the  consideration for the issue
hereof, expressly waived and released.


                                    ARTICLE 7
                                  MISCELLANEOUS

         SECTION 7.1 NOTICE OF CERTAIN EVENTS.  In the case of the occurrence of
any event described in Sections 3.1, 3.4, 3.5 or

                                      -20-

<PAGE>
3.6 of this  Debenture,  the  Company  shall cause to be mailed to the Holder of
this  Debenture  at its last  address as it appears  in the  Company's  security
registry,  at  least  20 days  prior  to the  applicable  record,  effective  or
expiration  date  hereinafter  specified  (or,  if such 20  days  notice  is not
possible,  at the earliest possible date prior to any such record,  effective or
expiration date), a notice stating (x) the date on which a record is to be taken
for the purpose of such dividend, distribution,  issuance or granting of rights,
options or warrants, or if a record is not to be taken, the date as of which the
holders of record of Common Stock to be entitled to such dividend, distribution,
issuance or granting of rights,  options or warrants are to be determined or (y)
the date on which such reclassification,  consolidation, merger, sale, transfer,
dissolution,  liquidation or winding-up is expected to become effective, and the
date as of which it is expected  that  holders of record of Common Stock will be
entitled  to  exchange  their  shares  for  securities,  cash or other  property
deliverable upon such  reclassification,  consolidation,  merger, sale transfer,
dissolution, liquidation or winding-up.

         SECTION  7.2  REGISTER.  (a) The  Company  shall keep at its  principal
office a register in which the Company  shall  provide for the  registration  of
this Debenture. Upon any transfer of this Debenture in accordance with Article 2
and 4  hereof,  the  Company  shall  register  such  transfer  on the  Debenture
register.

                  (b) The  Company  may  deem the  person  in  whose  name  this
Debenture  shall be registered upon the registry books of the Company to be, and
may treat it as,  the  absolute  owner of this  Debenture  (whether  or not this
Debenture shall be overdue) for the purpose of receiving  payment of interest on
or principal of this Debenture, for the conversion of this Debenture and for all
other  purposes,  and the  Company  shall not be  affected  by any notice to the
contrary. All such payments and such conversions shall be valid and effective to
satisfy and discharge the liability upon this Debenture to the extent of the sum
or sums so paid or the conversion or conversions so made.

         SECTION 7.3 WITHHOLDING.  To the extent required by applicable law, the
Company 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 Company from any payments made pursuant to this Debenture.

         SECTION 7.4 TRANSMITTAL OF NOTICES. Except as may be otherwise provided
herein,  any notice or other  communication  or delivery  required or  permitted
hereunder  shall be in  writing  and shall be  delivered  personally  or sent by
certified mail, postage prepaid, or by a nationally recognized overnight courier
service, and shall be deemed given when so delivered personally or by

                                      -21-

<PAGE>
overnight  courier  service,  or, if  mailed,  three (3) days  after the date of
deposit in the United States mails, as follows:

                  (1)      if to the Company, to:

                           Sheffield Pharmaceuticals, Inc.
                           30 Rockefeller Plaza, Suite 4515
                           New York, New York  10112
                           Attention: Douglas R. Eger, Chairman

                           With a copy to:

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

                  (2) if to the  Holder,  to the address of such Holder as shown
on the books of the Company.

Either of the Holder or the Company may change the  foregoing  address by notice
given pursuant to this Section 7.4.

         SECTION 7.5  GOVERNING  LAW. THIS  DEBENTURE  SHALL BE GOVERNED BY, AND
CONSTRUED IN ACCORDANCE  WITH, THE LAWS OF THE STATE OF NEW YORK (WITHOUT GIVING
EFFECT TO CONFLICTS  OF LAWS  PRINCIPLES).  WITH RESPECT TO ANY SUIT,  ACTION OR
PROCEEDINGS  RELATING TO THIS DEBENTURE,  THE COMPANY IRREVOCABLY SUBMITS TO THE
EXCLUSIVE  JURISDICTION  OF THE  COURTS OF THE STATE OF NEW YORK AND THE  UNITED
STATES  DISTRICT  COURT  LOCATED IN THE BOROUGH OF  MANHATTAN IN THE CITY OF NEW
YORK AND HEREBY WAIVES,  TO THE FULLEST EXTENT  PERMITTED BY APPLICABLE LAW, ANY
CLAIM  THAT  ANY  SUCH  SUIT,  ACTION  OR  PROCEEDING  HAS  BEEN  BROUGHT  IN AN
INCONVENIENT  FORUM.  SUBJECT TO APPLICABLE  LAW, THE COMPANY  AGREES THAT FINAL
JUDGMENT AGAINST IT IN ANY LEGAL ACTION OR PROCEEDING ARISING OUT OF OR RELATING
TO  THIS  DEBENTURE  SHALL  BE  CONCLUSIVE  AND  MAY BE  ENFORCED  IN ANY  OTHER
JURISDICTION  WITHIN OR OUTSIDE  THE UNITED  STATES BY SUIT ON THE  JUDGMENT,  A
CERTIFIED COPY OF WHICH JUDGMENT  SHALL BE CONCLUSIVE  EVIDENCE  THEREOF AND THE
AMOUNT OF ITS INDEBTEDNESS, OR BY SUCH OTHER MEANS PROVIDED BY LAW.

         SECTION 7.6 HEADINGS. The headings of the Articles and Sections of this
Debenture are inserted for convenience only and do not constitute a part of this
Debenture.

         SECTION 7.7 COUNTERPARTS. This Agreement may be executed in two or more
counterparts,  each of which shall be deemed an original  but all of which shall
constitute one and the same agreement.  A facsimile  transmission of this signed
Agreement shall be legal and binding on all parties hereto.


                                      -22-

<PAGE>
              [THE REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]

                                      -23-

<PAGE>

         IN WITNESS WHEREOF,  the Company has caused this Debenture to be signed
by its duly authorized  officer under its corporate  seal,  attested by its duly
authorized officer, on the date of this Debenture.

                                            SHEFFIELD PHARMACEUTICALS, INC.



                                            By:________________________________
                                               Name:
                                               Title:


                                            ATTEST:


                                            By:________________________________
                                               Name:
                                               Title:



INITIAL
HOLDER:

________________________________



By: ______________________________
            Name:
            Title:

                                      -24-

<PAGE>
                                                                    EXHIBIT A TO
                                              CONVERTIBLE SUBORDINATED DEBENTURE


                           [FORM OF CONVERSION NOTICE]


Dated:

TO:      Sheffield Pharmaceuticals, Inc.
         30 Rockefeller Plaza, Suite 4515
         New York, New York 10112
         Attn:  Douglas R. Eger, Chairman


                  The  undersigned  owner of this 6%  Convertible  Debenture due
September ___, 2000 (the "Debenture") issued by Sheffield Pharmaceuticals,  Inc.
(the   "Company")   hereby   irrevocably   exercises   its   option  to  convert
$________________  principal  amount of the  Debenture  [and  accrued and unpaid
interest  thereon to the date of this Notice]  into shares of the common  stock,
$.01 par value, of the Company ("Common Stock"), in accordance with the terms of
the  Debenture.  The  undersigned  hereby  instructs  the Company to convert the
portion of the Debenture  specified  above into shares of Common Stock issued at
Conversion in accordance with the provisions of Article 3 of the Debenture.  The
undersigned  directs that the Common Stock  issuable and  certificates  therefor
deliverable  upon  conversion,  the  Debenture  recertificated  in the principal
amount,  [and accrued and unpaid interest thereon to the date of this Notice 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 the Debenture.


______________________________________
                                      Signature

                  Fill in for registration of Debenture:

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


________________________________

________________________________

                                      -25-

<PAGE>
                                                                    EXHIBIT B TO
                                              CONVERTIBLE SUBORDINATED DEBENTURE

                       [FORM OF COMPANY REDEMPTION NOTICE]


Dated:_____________________

TO:      [Holder]
         [Address]


                  Sheffield   Pharmaceuticals,   Inc.  (the  "Company")   hereby
irrevocably exercises its option to redeem  $_________________  principal amount
of the 6% Convertible  Debenture due September  ____, 2000 issued by the Company
(the "Debenture"), at a Redemption Price of $_________ and of accrued and unpaid
interest thereon into shares of the common stock, $.01 par value, of the Company
("Common Stock"), in accordance with the terms of the Debenture. The undersigned
hereby instructs the Holder to surrender the portion of the Debenture  specified
above in accordance  with the provisions of Section 3.__ of the Debenture.  Upon
receipt of such  surrendered  Debenture,  the Company  shall  deliver the Common
Stock  issuable and  certificates  therefor  deliverable  upon  conversion,  the
Debenture  recertificated in the principal amount, if any, not being surrendered
for conversion hereby,  together with any check in payment for fractional Common
Stock,  to 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 Debenture.

Very truly yours,

SHEFFIELD PHARMACEUTICALS, INC.


By:____________________________
         Name:
         Title:


                                      -26-


                                                                    Exhibit 23.1




The Board of Directors
Sheffield Pharmaceuticals, Inc.;

We consent to incorporation by reference in the Registration Statement (Form S-3
No. 333-00000) of Sheffield  Pharmaceuticals,  Inc. (formerly  Sheffield Medical
Technologies,  Inc.) of our report  dated  February  11,  1994,  relating to the
consolidated  financial statements of Sheffield Medical  Technologies,  Inc. and
subsidiary  included  in the  Annual  Report  (Form  10-KSB)  for the year ended
December 31, 1996.

Our report dated  February  11, 1994,  contains an  explanatory  paragraph  that
states  that the  Company's  recurring  losses and net  deficit  position  raise
substantial  doubt  about its  ability  to  continue  as a  going  concern.  The
consolidated  financial  statements do not  include any  adjustments  that might
result from the outcome of this uncertainty.


                                                  /s/ KPMG PEAT MARWICK LLP
                                                  -------------------------
                                                      KPMG PEAT MARWICK LLP

Houston, Texas
October 17, 1997



                                                                    Exhibit 23.2




                         CONSENT OF INDEPENDENT AUDITORS

We  consent to the  reference  to our firm under the  caption  "Experts"  in the
Registration  Statement  (Form S-3 No.  333-00000)  and  related  Prospectus  of
Sheffield Pharmaceuticals,  Inc. for the registration of 2,893,334 shares of its
common stock and to the  incorporation by reference  therein of our report dated
February  12,  1997,  except for Note 9 as to which the date is March 14,  1997,
with   respect  to  the   consolidated   financial   statements   of   Sheffield
Pharmaceuticals,  Inc.  and  subsidiaries  included in its Annual  Report  (Form
10-KSB) for the year ended  December 31,  1996,  filed with the  Securities  and
Exchange Commission.



                                                    /s/  Ernst & Young LLP
                                                    -----------------------
                                                         Ernst & Young LLP

Princeton, New Jersey
October 16, 1997




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