SHEFFIELD PHARMACEUTICALS INC
S-3/A, 1997-08-01
PHARMACEUTICAL PREPARATIONS
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     As filed with the Securities and Exchange Commission on August 1, 1997
                                                      Registration No. 333-27753
    




                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                              --------------------
                                         
                               AMENDMENT NO. 1 TO
                             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.)


                              30 Rockefeller Plaza
                                   Suite 4515
                            New York, New York 10112
                                 (212) 957-6600
       ------------------------------------------------------------------

    (Address, Including Zip Code and Telephone Number, Including Area Code,
                  of Registrant's Principal Executive Offices)
                              --------------------
                                 Douglas R. Eger
                                    Chairman
                                         
                         Sheffield Pharmaceuticals, Inc.
                        30 Rockefeller Plaza, Suite 4515
                                          
                            New York, New York 10112
                                 (212) 957-6600
       ------------------------------------------------------------------
  (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>
                         CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>

==================================================================================================================================
                                                                          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            2,850,463 shares(1)(2)    $2.72(3)          $7,753,259.30(3)    $2,349.47
upon conversion of Series A Preferred
Stock Conversion Shares.....................
- ----------------------------------------------------------------------------------------------------------------------------------
Common Stock, $.01 par value, issuable             351,539  shares(1)      $3.65(4)         $1,283,117.35(4)     $388.82
upon exercise of Warrants granted to
holders of Series A Preferred Stock.........
- ----------------------------------------------------------------------------------------------------------------------------------
Common Stock, $.01 par value, issuable              24,559 shares(1)(2)    $2.72(3)         $66,800.48(3)        $20.24
upon conversion of Series A Preferred
Stock issued to Frith Brothers
Investments, Inc. and as stock dividends
on Series A Preferred Stock held
thereby.....................................
- ----------------------------------------------------------------------------------------------------------------------------------
Common Stock, $.01 par value issuable               98,000 shares          $2.72(3)         $266,560.00(3)       $80.78
as stock dividends on Series A Preferred
Stock.......................................
- ----------------------------------------------------------------------------------------------------------------------------------
Common Stock, $.01 par value, issuable             250,000  shares(1)      $5.25(5)         $1,312,500.00(5)     $397.73
upon exercise of warrants issued to
Brean Murray & Co...........................
- ----------------------------------------------------------------------------------------------------------------------------------
Common Stock, $.01 par value, issuable             100,000  shares(1)      $3.9375(6)       $393,750.00(6)       $119.32
upon exercise of options issued to
Bailey & Associates.........................
- ----------------------------------------------------------------------------------------------------------------------------------
Common Stock, $.01 par value, issuable              40,000  shares(1)      $5.50(7)         $220,000.00(7)       $66.67
upon exercise of options issued to The
Research Works, Inc.........................
- ----------------------------------------------------------------------------------------------------------------------------------
Common Stock, $.01 par value, issuable              20,000 shares(1)       $3.77(8)          $75,400.00(8)       $22.85
upon exercise of options issued to R.
Figliozzi...................................
- ----------------------------------------------------------------------------------------------------------------------------------
Common Stock, $.01 par value, issuable              25,000 shares(1)       $4.125(9)        $103,125.00(9)       $31.25
upon exercise of options issued to B.
Laurent.....................................
- ----------------------------------------------------------------------------------------------------------------------------------
 Common Stock, $.01 par value,                       5,000 shares(1)       $3.375(10)       $16,875.00(10)       $5.11
issuable upon exercise of options issued
to Copley-Pacific, Inc......................
- ----------------------------------------------------------------------------------------------------------------------------------
Common Stock, $.01 par value, issuable               2,922 shares(1)       $3.375(11)       $9,861.75(11)        $2.99
upon exercise of options issued to D.
Poretz......................................
- ----------------------------------------------------------------------------------------------------------------------------------
Common Stock, $.01 par value, issuable              15,000  shares(1)      $3.1875(12)      $47,812.50(12)       $14.49
upon exercise of options issued to D.
Gallagher...................................
- ----------------------------------------------------------------------------------------------------------------------------------
Common Stock, $.01 par value, issuable              15,000 shares(1)        $2.75(13)       $41,250.00(13)       $12.50
upon exercise of options issued to J.
Leach.......................................
- ----------------------------------------------------------------------------------------------------------------------------------
   
  Common Stock, par value $.01 per                 100,000 shares          $2.375(14)       $237,500(14)         $71.97
share, issued to Stone Pine Atlantic,
LLC
    
</TABLE>



                                      -ii-

<PAGE>



<TABLE>
<CAPTION>

- ----------------------------------------------------------------------------------------------------------------------------------
<S>                                                <C>                     <C>               <C>                 <C>    
 Common Stock, par value $.01 per                  200,000 shares(1)       $2.6875(15)       $537,000.00(15)     $162.73
share, issuable upon exercise of options
granted to Stone Pine Atlantic, LLC
- ----------------------------------------------------------------------------------------------------------------------------------
Common Stock, par value $.01 per                    54,396 shares(1)        $2.375(16)      $126,815.50(16)      $38.43
share, issuable upon exercise of warrants
issued to LHIP Acquisition Company LLC
- ----------------------------------------------------------------------------------------------------------------------------------
Total(17)                                                                                   $12,491,626.88       $3,785.35
==================================================================================================================================
</TABLE>


   
*  The expenses of the offering described in this registration statement, all of
   which are payable by the Company, are estimated at $165,000.00
    

(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  Series A Preferred  Stock  resulting from the  fluctuating
        conversion rate of the Series A Preferred Stock 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 based on the average of the high and low prices of
        the Registrant's Common Stock as reported on the American Stock Exchange
        on May 21, 1997.
(4)     Based upon  $3.65 per share  exercise  price of the  Series A  Preferred
        Stock Warrants.
(5)     Based upon $5.25 per share exercise price of such warrants.
(6)     Based upon $3.9375 per share exercise price of such options.
(7)     Based upon $5.50 per share exercise price of such options.
(8)     Based upon $3.77 per share exercise price of such options.
(9)     Based upon $4.125 per share exercise price of such options.
(10)    Based upon $3.375 per share exercise price of such options.
(11)    Based upon $3.375 per share exercise price of such options.
(12)    Based upon $3.1875 per share exercise price of such options.
(13)    Based upon $2.75 per share exercise price of such options.
   
(14)    Estimated  solely for the purpose of calculating  the  registration  fee
        pursuant  to Rule 457 based on the  average  high and low  prices of the
        Registrant's  Common Stock as reported on the American Stock Exchange on
        July 30, 1997.
(15)    Based upon $2.6875 per share exercise price of such options.
(16)    Based upon the exercise prices of these warrants,  ranging from $4.00 to
        $6.50 per share.
(17)    Registrant  previously  paid a registration  fee of $3,512.22 on May 25,
        1997. An additional fee of $273.13 is being paid with this Amendment No.
        1.
    


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

        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.


                                      -iii-
<PAGE>

   
                         SHEFFIELD PHARMACEUTICALS, INC.
    

                              CROSS REFERENCE SHEET

          PURSUANT TO ITEM 501(B) OF REGULATION S-K SHOWING LOCATION IN
             PROSPECTUS OF INFORMATION REQUIRED BY ITEMS OF FORM S-3

<TABLE>
<CAPTION>

             ITEM NUMBER AND HEADING IN
             FORM S-3 REGISTRATION STATEMENT                              CAPTION OR LOCATION IN PROSPECTUS
<S>                                                                       <C>
1.   Forepart of the Registration Statement and Outside Front
      Cover Page of Prospectus.........................................   Forepart of the Registration Statement;
                                                                            Outside Front Cover Page of
                                                                            Prospectus
2.   Inside Front and Outside Back Cover Pages of Prospectus...........   Inside Front Cover Page of
                                                                            Prospectus; Available Information
3.   Summary Information, Risk Factors and Ratio of Earnings to
      Fixed Charges....................................................   The Company; Risk Factors
4.   Use of Proceeds...................................................   Use of Proceeds
5.   Determination of Offering Price...................................           *
6.   Dilution..........................................................           *
7.   Selling Security-Holders..........................................   Selling Stockholders
8.   Plan of Distribution..............................................   Plan of Distribution
9.   Description of Securities to be Registered .......................   Description of Securities

10.  Interests of Named Experts and Counsel ...........................   Legal Matters; Experts
11.  Material Changes..................................................   Recent Developments
12.  Incorporation of Certain Information by Reference.................   Incorporation of Certain Documents by
                                                                            Reference
 13.  Disclosure of Commission Position on Indemnification
      for Securities Act Liabilities...................................           *
</TABLE>

_______________
*  Not applicable


<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 AUGUST 1, 1997
    


         PROSPECTUS
         ----------

   
                         SHEFFIELD PHARMACEUTICALS, INC.
                 (formerly Sheffield Medical Technologies Inc.)

                        4,151,879 SHARES OF COMMON STOCK

         This  Prospectus  relates to the offer and  resale by  certain  selling
stockholders (collectively,  the "Selling Stockholders") of (i) 3,300,002 shares
(the  "Preferred  Stock  Conversion  Shares")  of common  stock,  $.01 par value
("Common Stock"), of Sheffield Pharmaceuticals, Inc. (formerly Sheffield Medical
Technologies  Inc.) (the  "Company")  issuable upon  conversion of the Company's
Series A  Cumulative  Convertible  Redeemable  Preferred  Stock  (the  "Series A
Preferred Stock"), as stock dividends on such shares of Series A Preferred Stock
and upon the  exercise of certain  stock  purchase  warrants of the Company (the
"Series A Warrants")  issued to  purchasers  of Series A Preferred  Stock,  (ii)
24,559  shares of Common Stock  issuable  upon  conversion of shares of Series A
Preferred Stock issued to Frith Brothers  Investments,  Inc. and as dividends on
such shares of Series A Preferred  Stock,  (iii) 250,000  shares of Common Stock
issuable  upon the exercise of certain  stock  purchase  warrants of the Company
issued to Brean  Murray & Co. in  connection  with  certain  financial  services
provided by Brean  Murray & Co.,  (iv) 100,000  shares of Common Stock  issuable
upon the exercise of certain  stock  purchase  options of the Company  issued to
Bailey & Associates in connection with certain  financial  services  provided by
Bailey & Associates, (v) 40,000 shares of Common Stock issuable upon exercise of
certain stock purchase options of the Company issued to The Research Works, Inc.
in connection with certain services  provided by The Research Works,  Inc., (vi)
20,000  shares of Common  Stock  issuable  upon the  exercise  of certain  stock
purchase  options of the Company issued to Robert  Figliozzi in connection  with
certain consulting  services provided by Robert Figliozzi (vii) 25,000 shares of
Common Stock issuable upon the exercise of certain stock purchase options of the
Company issued to Bernard Laurent,  (viii) 5,000 shares of Common Stock issuable
upon the exercise of certain  stock  purchase  options of the Company  issued to
Copley-Pacific,  Inc. in  connection  with certain  financial  public  relations
services  provided by  Copley-Pacific,  Inc.,  (ix) 2,922 shares of Common Stock
issuable  upon the  exercise of certain  stock  purchase  options of the Company
issued to Douglas  Poretz Ltd. in  connection  with certain  financial  services
provided by D. Poretz  Ltd.,  (x) 15,000  shares of Common Stock  issuable  upon
exercise of certain stock  purchase  options of the Company  issued to Daniel J.
Gallagher , (xi) 15,000 shares of Common Stock issuable upon exercise of certain
stock purchase options of the Company issued to Jeffrey R. Leach,  (xii) 100,000
shares of Common Stock issued to Stone Pine Atlantic, LLC, (xiii) 200,000 shares
of Common  Stock  issuable  upon  options  granted to Stone Pine,  LLC and (xiv)
54,396 shares of Common Stock issuable upon exercise of warrants  issued to LHIP
Acquisition  Company LLC. 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 Series A Preferred
Stock resulting from the  fluctuating  conversion rate of the Series A Preferred
Stock  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 - Series A Preferred Stock."

         The Common Stock  presently  trades on the American Stock Exchange (the
"AMEX") under the symbol "SHM".  On July 30, 1997, the closing sale price of the
Common Stock on the AMEX was $2-7/16.
    




<PAGE>
         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. 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.

         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......................................................  15

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

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

DESCRIPTION OF SECURITIES............................................  18

PLAN OF DISTRIBUTION.................................................  20

LEGAL MATTERS........................................................  20

EXPERTS  ............................................................  20

ADDITIONAL INFORMATION...............................................  21
    



                                       -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. 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 amended by
                           Amendment No. 1 filed with the Commission on July 31,
                           1997.
    

                  (c)      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.

         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


                                       -4-

<PAGE>

   
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., 30 Rockefeller Plaza, Suite 4515,
New York, New York 10112,  Attention:  Douglas R. Eger, Chairman.  Oral requests
should be directed to Mr. Eger at (212) 957-6600.
    


                                       -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,  and holds an  exclusive
option  to  license  certain  compounds  and  their  uses for the  treatment  of
gastrointestinal  disorders, such as secretory diarrhea (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 HIV viral coating after the HIV virus has reproduced in a
human cell.  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.  The related  research is being
conducted  by  Professor   Chermann  and  a  team  of  scientific   and  medical
investigators  affiliated  with the  French  National  Institute  of Health  and
Medical Research.

         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 is
being 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 is being
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 three months ended March 31, 1997,  for
the fiscal year ended  December  31, 1996 and from the  Company's  inception  to
March 31,  1997,  (ii) the  Company's  current  estimate by project of committed
and/or anticipated funding  requirements after March 31, 1997 and (iii) revenues
received to date by project.

                                      -7-
    
<PAGE>

                         DIRECT RESEARCH AND DEVELOPMENT
                                    EXPENSES
                                  (IN DOLLARS)
<TABLE>
<CAPTION>

                                                                                                       COMMITTED
                                         THREE            FISCAL                                         AND/OR
                                        MONTHS             YEAR                                     ANTICIPATED
                                         ENDED             ENDED            INCEPTION TO            R&D FUNDING           REVENUE
            R&D PROJECT                 3/31/97          12/31/96             3/31/97              AFTER 3/31/97*        RECEIVED
- --------------------------------    -------------     -------------     ------------------     -------------------     ------------
<S>                                  <C>                 <C>                  <C>                     <C>                 <C>
Multi-Dose Inhaler (MSI)             1,130,316           144,409              1,274,725               15,427,275              -0-
Ion Pharmaceuticals,                   523,603         2,097,020              4,332,167                  938,706           10,000
 Inc. Technologies
RBC-CD4 Electroinsertion                 9,023           515,036              6,247,449                    7,534              -0-
 Technology
Liposome-CD4 Technology                    -0-            60,449              2,322,322                      -0-          500,000
HIV/AIDS Vaccine                        25,000           414,849              1,099,118                  125,000              -0-
UGIF Technology                            -0-            16,398                103,401                  100,000              -0-
Membrane Attack Complex                121,872           121,874                243,746                  140,936              -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  through its  wholly-owned  subsidiary,  U-Tech  Medical
Corporation,  a Texas  corporation  ("U-Tech"),  with its  principal  offices in
Houston, Texas. Effective May 19, 1992, Sheffield  Pharmaceuticals,  Inc. became
domesticated  as a  Washington  corporation  in the  State  of  Wyoming  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.
    


                                       -8-

<PAGE>

   
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
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,  U-Tech  and Ion and CP
Pharmaceuticals, Inc.
    

         The Company's  headquarters are located at 30 Rockefeller  Plaza, Suite
4515, New York, New York 10112 and its telephone number is (212) 957-6600.


                                  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  its
wholly-owned  subsidiary,  U-Tech, a Texas corporation,  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 $2,668,088 for the fiscal
year  ended  December  31,  1996  and for the  quarter  ended  March  31,  1997,
respectively,  and as of March 31, 1997, the Company had an accumulated  deficit
of $29,256,740. 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 March 31,
1997 was $3,027,503. As of such date, the Company had trade payables and accrued


                                       -9-

<PAGE>


   
liabilities  of $332,565,  current  funding  obligations of $1,172,310 and other
liabilities  of $43,375.  In addition,  the Company is obligated to fund between
March 31,  1997 and March 31, 1998  approximately  $3,300,000  in the  aggregate
under  existing  agreements.  The Company will be required to obtain  additional
funds  for 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  35,700  shares of 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. See "Description of
Securities - Series A Cumulative Convertible Redeemable Preferred 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   $13,000,000  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.



                                       -10-

<PAGE>

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 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
$3,300,000 in the aggregate under existing  agreements  during the  twelve-month
period  following March 31, 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.



                                      -11-

<PAGE>



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
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


                                      -12

<PAGE>



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.

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 June 30, 1997, the Company had reserved  approximately  4,600,000
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


                                      -13-

<PAGE>

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
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

         Certain of the Selling  Stockholders  hold Series A Warrants  entitling
such Selling  Stockholders  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.  Certain of the Selling  Stockholders  also hold
35,700 shares of Series A Preferred  Stock 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 will be  adjusted,  and the  number of shares
beneficially  owned by the Selling  Stockholder 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. The exercise of Series A Warrants, the conversion of such shares of Series
A  Preferred  Stock and the sale of such  shares of Common  Stock  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  approximately  $3,000,000  in the
event that all shares of Common  Stock  offered  hereby that are  issuable  upon
exercise of options or 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.
    



133087.13
                                      -14-

<PAGE>



                                 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, 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.
    




                                      -15-

<PAGE>



                              SELLING STOCKHOLDERS

   
         Set  forth  below  is  information  at July  23,  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 Beneficially
                                            Owned Prior to                Shares to be                   Owned After
                                              Offering(1)                    Sold in                      Offering
                                 -------------------------------            Offering        --------------------------------
                                                  (2)                   --------------                       (3)
NAME(1)                                 NUMBER             PERCENT                                NUMBER             PERCENT
- -------                                 ------             -------                                ------             -------
<S>                                  <C>                     <C>             <C>                  <C>                    <C>
CC Investments, LDC                  429,757(4)(5)           3.5             942,856              ---(4)                 *
Merced Partners, L.P.                107,440(4)(6)            *              235,714              ---(4)                 *
Lakeshore International, Ltd.        214,879(4)(7)           1.8             471,429              ---(4)                 *
Global Bermuda, L.P.                 322,319(4)(8)           2.6             707,143              ---(4)                 *
 Angelo, Gordon & Co., L.P.           42,976(4)(9)            *               94,286              ---(4)                 *
Nutmeg Partners, L.P.                 42,976(4)(10)           *               94,286              ---(4)                 *
AG Super Fund, L.P.                   42,976(4)(11)           *               94,286              ---(4)                 *
GAM Arbitrage Investments,                       2)
   Inc.                               42,976(4)(1             *               94,286              ---(4)                 *
AG Super Fund International                      3)
   Partners, L.P.                     42,976(4)(1             *               94,286              ---(4)                 *
                                      42,976
AG ARB Partners, L.P.                    (4)(14)              *               94,286              ---(4)                 *
Raphael, L.P.                         64,464(4)(15)           *              141,429              ---(4)                 *
 AG Long Term Super Fund,                        6)
   L.P.                               42,976(4)(1             *               94,286              ---(4)                 *
MichaelAngelo, L.P.                   64,464(4)(17)           *              141,429              ---(4)                 *
Frith Brothers Investments,                      8)
   
   Inc.                               24,559(4)(1             *               24,559              ---(4)                 *
Brean Murray & Co.                   250,000(19)             2.0             250,000                 ---                 *
Bailey Associates                     50,000(20)              *              100,000                 ---                 *
The Research Works, Inc.              40,000 (21)             *               40,000                 ---                 *
Robert Figliozzi                      45,000(22)              *               20,000              25,000                 *
Bernard Laurent                      157,472(23)             1.3              25,000             132,472                1.1
Copley-Pacific, Inc.                   5,000 (24)             *                5,000                 ---                 *
Douglas Poretz Ltd.                    2,922(25)              *                2,922                 ---                 *
Daniel Gallagher                      15,000(26)              *               15,000                 ---                 *

Jeffrey R. Leach                      15,000(27)              *               15,000                 ---                 *
Stone Pine Atlantic LLC              100,000                  *              300,000                 ---                 *
LHIP Acquisition Company LLC          54,396(28)              *               54,396                 ---                 *
    
</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.



                                      -16-

<PAGE>



(4)      The number of shares of Common Stock issuable upon conversion of Series
         A Preferred  Stock and in respect of stock dividends  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 Series A Preferred Stock, see "Description
         of  Securities - Series A Preferred  Stock."  Consequently,  due to the
         fluctuating conversion rate of the Series A Preferred Stock, the number
         of shares of Common Stock that a holder of Series A Preferred Stock may
         receive upon conversion and sale pursuant to this Prospectus 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 $3.31875 (calculated in accordance with the applicable terms of
         the Series A Preferred Stock as of the date of issuance of the Series A
         Preferred Stock on February 28, 1997), (ii) that all shares of Series A
         Preferred  Stock  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 Series A Preferred  Stock,
         (iii)  that all  Series A Warrants  beneficially  owned by the  Selling
         Stockholder  have been  exercised  for shares of Common  Stock and (iv)
         that all Common Stock dividends  accrued and payable in accordance with
         the terms of the Series A Preferred Stock as of May 29, 1997 (the first
         day  such  stock  dividends  may be  issuable  in  accordance  with the
         applicable terms of the Series A Preferred Stock) have been issued. 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 shares of Series A Preferred  Stock  beneficially
         owned by it into  shares of Common  Stock and has  received  all Common
         Stock  issuable as Common  Stock  dividends  on such Series A Preferred
         Stock as a result of such  conversion,  (y) has  exercised all Series A
         Warrants beneficially owned by it and (z) has sold all shares of Common
         Stock received by it upon such conversion and exercise.

(5)      Consists of (i) 301,318 shares of Common Stock issuable upon conversion
         of Series A Preferred Stock Conversion  Shares,  (ii) 100,439 shares of
         Common Stock issuable upon the exercise of stock purchase  warrants and
         (iii)  28,000  shares of Common  Stock  issuable as stock  dividends on
         Series A Preferred Stock.

(6)      Consists of (i) 75,330 shares of Common Stock issuable upon  conversion
         of Series A Preferred Stock  Conversion  Shares,  (ii) 25,110 shares of
         Common Stock  issuable upon the exercise of Series A Warrants and (iii)
         7,000  shares of Common Stock  issuable as stock  dividends on Series A
         Preferred Stock.

(7)      Consists of (i) 150,659 shares of Common Stock issuable upon conversion
         of Series A Preferred Stock  Conversion  Shares,  (ii) 50,220 shares of
         Common Stock  issuable upon the exercise of Series A Warrants and (iii)
         14,000 shares of Common Stock  issuable as stock  dividends on Series A
         Preferred Stock.

(8)      Consists of (i) 225,989 shares of Common Stock issuable upon conversion
         of Series A Preferred Stock  Conversion  Shares,  (ii) 75,330 shares of
         Common Stock  issuable upon the exercise of Series A Warrants and (iii)
         21,000 shares of Common Stock  issuable as stock  dividends on Series A
         Preferred Stock.

(9)      Consists of (i) 30,132 shares of Common Stock issuable upon  conversion
         of Series A Preferred Stock  Conversion  Shares,  (ii) 10,044 shares of
         Common Stock  issuable upon the exercise of Series A Warrants and (iii)
         2,800  shares of Common Stock  issuable as stock  dividends on Series A
         Preferred Stock.

(10)     Consists of (i) 30,132 shares of Common Stock issuable upon  conversion
         of Series A Preferred Stock  Conversion  Shares,  (ii) 10,044 shares of
         Common Stock  issuable upon the exercise of Series A Warrants and (iii)
         2,800  shares of Common Stock  issuable as stock  dividends on Series A
         Preferred Stock.

(11)     Consists of (i) 30,132 shares of Common Stock issuable upon  conversion
         of Series A Preferred Stock  Conversion  Shares,  (ii) 10,044 shares of
         Common Stock  issuable upon the exercise of Series A Warrants and (iii)
         2,800  shares of Common Stock  issuable as stock  dividends on Series A
         Preferred Stock.



                                      -17-

<PAGE>



(12)     Consists of (i) 30,132 shares of Common Stock issuable upon  conversion
         of Series A Preferred Stock  Conversion  Shares,  (ii) 10,044 shares of
         Common Stock  issuable upon the exercise of Series A Warrants and (iii)
         2,800  shares of Common Stock  issuable as stock  dividends on Series A
         Preferred Stock.

(13)     Consists of (i) 30,132 shares of Common Stock issuable upon  conversion
         of Series A Preferred Stock  Conversion  Shares,  (ii) 10,044 shares of
         Common Stock  issuable upon the exercise of Series A Warrants and (iii)
         2,800  shares of Common Stock  issuable as stock  dividends on Series A
         Preferred Stock.

(14)     Consists of (i) 30,132 shares of Common Stock issuable upon  conversion
         of Series A Preferred Stock  Conversion  Shares,  (ii) 10,044 shares of
         Common Stock  issuable upon the exercise of Series A Warrants and (iii)
         2,800  shares of Common Stock  issuable as stock  dividends on Series A
         Preferred Stock.

(15)     Consists of (i) 45,198 shares of Common Stock issuable upon  conversion
         of Series A Preferred Stock  Conversion  Shares,  (ii) 15,066 shares of
         Common Stock  issuable upon the exercise of Series A Warrants and (iii)
         4,200  shares of Common Stock  issuable as stock  dividends on Series A
         Preferred Stock.

(16)     Consists of (i) 30,132 shares of Common Stock issuable upon  conversion
         of Series A Preferred Stock  Conversion  Shares,  (ii) 10,044 shares of
         Common Stock  issuable upon the exercise of Series A Warrants and (iii)
         2,800  shares of Common Stock  issuable as stock  dividends on Series A
         Preferred Stock.

(17)     Consists of (i) 45,198 shares of Common Stock issuable upon  conversion
         of Series A Preferred Stock  Conversion  Shares,  (ii) 15,066 shares of
         Common Stock  issuable upon the exercise of Series A Warrants and (iii)
         4,200  shares of Common Stock  issuable as stock  dividends on Series A
         Preferred Stock.

(18)     Consists of (i) 22,599 shares of Common Stock issuable upon  conversion
         of Series A Preferred Stock  Conversion  Stock and (ii) 1,960 shares of
         Common Stock issuable as stock dividends on Series A Preferred Stock.

(19)     Consists of 250,000  shares of Common Stock  issuable upon the exercise
         of warrants.

   
(20)     Consists of 50,000 shares of Common Stock issuable upon the exercise of
         common stock purchase options.
    

(21)     Consists of 40,000 shares of Common Stock issuable upon the exercise of
         common stock purchase options.

   
(22)     Consists of 45,000 shares of Common Stock issuable upon the exercise of
         common stock purchase options.

(23)     Includes (i) 110,000  shares of Common Stock  issuable upon exercise of
         options  exercisable  within 60 days after July 23,  1997,  (ii) 25,000
         shares of Common Stock owned by Global Equities and (iii) 12,500 shares
         of Common Stock issuable upon exercise of warrants  exercisable  within
         60 days after July 23, 1997 held by Global  Equities.  Mr. Laurent is a
         director of Global Equities. Mr. Laurent disclaims beneficial ownership
         of any shares of Common  Stock that  Global  Equities  has the right to
         acquire.
    

(24)     Consists of 5,000 shares of Common Stock  issuable upon the exercise of
         common stock purchase options.

(25)     Consists of 2,922 shares of Common Stock  issuable upon the exercise of
         common stock purchase options.

(26)     Consists of 15,000 shares of Common Stock issuable upon the exercise of
         common stock purchase options.

(27)     Consists of 15,000 shares of Common Stock issuable upon the exercise of
         common stock purchase options.



                                      -18-

<PAGE>

   
(28)     Consists of 54,396 shares of Common Stock issuable upon the exercise of
         common stock warrants.
    


                            DESCRIPTION OF SECURITIES

         The  Company is  currently  authorized  to issue  30,000,000  shares of
Common Stock,  $.01 par value per share, of which 11,988,274  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 35,700 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.  The  Company  has 35,700  shares of its
Series A Preferred Stock outstanding on the date of this Prospectus.

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 35,700 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
    


                                      -19-

<PAGE>

   
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.

         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.
    

TRANSFER AGENT

         The Company's  transfer agent for its currently  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 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).

         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.




                                      -20-

<PAGE>

                                     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.


                             ADDITIONAL INFORMATION

         The Company has filed with the Commission a  Registration  Statement on
Form S-8 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.


                                      -21-

<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.........................         $    3,785.35
         Legal expenses................................            $120,000.00
         AMEX Listing Fees.............................           $ 17,500.00
         Accounting fees and expenses..................           $ 20,000.00
         Miscellaneous.................................         $    3,714.65
                  Total................................           $165,000.00
    


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
ss.145 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                       (2)

     5.1    Opinion of Olshan Grundman Frome & Rosenzweig LLP      (3)
            (includes Consent)

    23.1    Consent of KPMG Peat Marwick LLP                       (3)

    23.2    Consent of Ernst & Young LLP                           (3)

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

   
    24.1    Power of Attorney (included in the signature page      (3)
            to this Registration Statement)
    



- ---------------------
         (1)      Incorporated  by  reference  to exhibit no. 3.1 filed with the
                  Registrant's  Annual Report on Form 10-KSB for the fiscal year
                  ended December 31, 1996 filed with the Commission.
         (2)      Incorporated  by  reference  to exhibit no. 3.2 filed with the
                  Registrant's  Annual Report on Form 10-KSB for the fiscal year
                  ended December 31, 1995 filed with the Commission.
         (3)      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 amendment to
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 August 1, 1997.

                                       SHEFFIELD PHARMACEUTICALS, INC.


Dated:    August 1, 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,  Loren G. Peterson and George Lombardi 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      August 1, 1997
- --------------------------------
         Douglas R. Eger


/S/ LOREN G. PETERSON                  Director and Chief         August 1, 1997
- --------------------------------       
         Loren G. Peterson             Executive Officer


/S/ THOMAS FITZGERALD                  Director, President and    August 1, 1997
- --------------------------------
         Thomas Fitzgerald             Chief Operating Officer
    


                                       Director                   August 1, 1997
         John M. Bailey


                                       Director                   August 1, 1997
         Digby W. Barrios


   
/S/ GEORGE LOMBARDI                    Vice President, Chief      August 1, 1997
- --------------------------------
         George Lombardi               Financial Officer,
                                                         
                                       Treasurer and Secretary
                                       (Chief Financial and
                                       Chief Accounting Officer)
    


                                      II-7

                                                                     Exhibit 5.1
                     OLSHAN GRUNDMAN FROME & ROSENZWEIG LLP
                                 505 Park Avenue
                            New York, New York 10022
                                 (212) 753-7200

                                         
                                 August 1, 1997
                                          

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

   
Re:      Sheffield   Pharmaceuticals, Inc.
         AMENDMENT NO. 1 TO REGISTRATION STATEMENT ON FORM S-3
         -----------------------------------------------------
    

Ladies and Gentlemen:

   
                  Reference  is made to the  Registration  Statement on Form S-3
(Registration No. 27753) dated May 23, 1997, as amended by Amendment No. 1 dated
as of the date hereof (as so amended, the "Registration Statement"),  filed with
the  Securities  and Exchange  Commission  by Sheffield  Pharmaceuticals,  Inc.,
(formerly  Sheffield  Medical  Technologies  Inc.), a Delaware  corporation (the
"Company").  The Registration Statement relates to the resale of an aggregate of
4,151,879  shares (the  "Shares") of Common  Stock,  $.01 par value (the "Common
Stock"),  of the Company  consisting  of (i)  2,948,463  shares of Common  Stock
issuable upon  conversion of 35,000 shares of the Company's  Series A Cumulative
Convertible Redeemable Preferred Stock ("Series A Preferred Stock") and as stock
dividends  payable on such  shares of Series A  Preferred  Stock;  (ii)  351,539
shares of Common Stock  issuable upon exercise of certain  common stock purchase
warrants  issued  to  purchasers  of Series A  Preferred  Stock  (the  "Series A
Warrants");  (iii) 24,559 shares of Common Stock issuable upon conversion of 700
shares of Series A Preferred  Stock issued to Frith Brothers  Investments,  Inc.
and as stock dividends  payable on such shares of Series A Preferred Stock; (iv)
250,000  shares of Common Stock issuable upon exercise of a common stock warrant
granted to Brean Murray & Co. ; (v) 54,396 shares of Common Stock  issuable upon
exercise of common stock warrants issued to LHIP  Acquisition  Company LLC; (vi)
422,922  shares of Common Stock  issuable upon exercise of certain  common stock
options granted by the Company ; and (vii) 100,000 shares of Common Stock issued
to Stone Pine Atlantic, LLC (the "Stone Pine Shares").
    

                  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 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 (a) the
Stone  Pine  Shares  have been duly and  validly  issued  and are fully paid and
non-assessable  and (b) the other 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,  a partner  of this
firm, holds options to purchase 15,000 shares of Common Stock.

                                          Very truly yours,

                                          OLSHAN GRUNDMAN FROME & ROSENZWEIG LLP

                                                                    Exhibit 23.1


   
The Board of Directors
Sheffield   Pharmaceuticals, Inc.:


We consent to  incorporation by reference in Amendment No. 1 to the Registration
Statement  (Form S-3 No. 333- 27753) of Sheffield  Pharmaceuticals,  Inc. of our
report  dated  February  11,  1994,  relating  to  the  consolidated   financial
statements of Sheffield  Pharmaceuticals,  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
July 31, 1997
    

                                                                    Exhibit 23.2

                         CONSENT OF INDEPENDENT AUDITORS


   
We consent to the reference to our firm under the caption "Experts" in Amendment
No. 1 to the  Registration  Statement  (Form S-3 No.  333-  27753)  and  related
Prospectus of Sheffield Pharmaceuticals,  Inc. for the registration of 4,151,879
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
July 30, 1997
    


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