INTERNEURON PHARMACEUTICALS INC
S-3/A, 1996-03-15
PHARMACEUTICAL PREPARATIONS
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     As filed with the Securities and Exchange Commission on March 15, 1996
                            Registration No. 333-1273
- -----------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                               AMENDMENT NO. 1 TO
                            REGISTRATION STATEMENT ON
                                    FORM S-3
                                      UNDER
                           THE SECURITIES ACT OF 1933

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


                        INTERNEURON PHARMACEUTICALS, INC.
             (Exact name of registrant as specified in its charter)

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



DELAWARE                                                 04-3047911
(State or other jurisdiction of                      (I.R.S. Employer I.D.
Incorporation)                                             number)

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

                        INTERNEURON PHARMACEUTICALS, INC.
                                99 Hayden Avenue
                               Lexington, MA 02173
                                 (617) 861-8444
   (Address and telephone number of Registrant's principal executive offices)

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

                        Glenn L. Cooper, M.D., President
                               and Chief Executive
                               Officer INTERNEURON
                              PHARMACEUTICALS, INC.
                                99 Hayden Avenue
                               Lexington, MA 02173
                                 (617) 861-8444
               (Address and telephone number of agent for service)

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

                                   Copies to:
                               Jill M. Cohen, Esq.
                      Bachner, Tally, Polevoy & Misher, LLP
                               380 Madison Avenue
                            New York, New York 10017
                                 (212) 687-7000
                      ------------------------------------


Approximate date of proposed commencement of sale to 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, please check the following box. |X|

If this Form is filed to register additional securities for an offering pursuant
to Rule 462(b) under the Securities Act, check the following box and list the
Securities Act registration statement number of the earlier registration
statement for the same offering.  | | ____________

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under
the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  | | _____________

If delivery of the prospectus is expected to be made pursuant to Rule 434, check
the following box. | |

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<PAGE>
<TABLE>

                   CALCULATION OF ADDITIONAL REGISTRATION FEE
<S>                          <C>                <C>                 <C>                      <C>                       
       TITLE OF EACH                            PROPOSED MAXIMUM    PROPOSED MAXIMUM
    CLASS OF ADDITIONAL      ADDITIONAL AMOUNT   OFFERING PRICE      AGGREGATE ADDITIONAL    AMOUNT OF ADDITIONAL
SECURITIES TO BE REGISTERED   TO BE REGISTERED    PER UNIT (1)        OFFERING PRICE (1)       REGISTRATION FEE

Common Stock,  $.001 par
value.......................     14,612(2)            $29.00(3)            $423,748                   $146.12*

Total.......................                                                                        36,200.55


*     $36,054.43 previously paid.
</TABLE>

(1)   Estimated solely for purposes of calculating the additional registration
      fee pursuant to Rule 457(a) under the Securities Act.

(2)   Additional shares to be sold by the Selling Securityholders.

(3)   Fee for Common Stock to be sold by Selling Securityholders is based on
      the average of the high and low price of the Common Stock as of March 12,
      1996.

      Pursuant to Rule 416, there are also being registered for resale such
      additional shares of Common Stock as may become issuable pursuant to
      "anti-dilution" provisions of the warrants.

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

      The Registrant hereby amends this Registration Statement on such date or
dates as may be necessary to delay its effective date until the Registrant shall
file a further amendment which specifically states that this Registration
Statement shall thereafter become effective in accordance with Section 8(a) of
the Securities Act of 1933 or until the Registration Statement shall become
effective on such date as the Commission, acting pursuant to said Section 8(a),
may determine.

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<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 - Preliminary Prospectus dated March 15, 1996

PROSPECTUS

                        INTERNEURON PHARMACEUTICALS, INC.
                        3,533,078 shares of Common Stock
                             11,100 Class B Warrants

                 This Prospectus relates to (i) 3,533,078 shares (the "Shares")
of Common Stock, par value $.001 per share (the "Common Stock") of Interneuron
Pharmaceuticals, Inc. (the "Company"), of which 3,122,899 Shares are
outstanding, 11,100 Shares are issuable (and offered) by the Company upon
exercise of the Class B Warrants also offered hereby and 399,079 Shares are
issuable upon exercise of other warrants, and (ii) 11,100 Class B Warrants. Each
Class B Warrant entitles the holder to purchase one share of Common Stock at
$4.75 per share, subject to adjustment, on or prior to March 15, 1996. The
Shares and the Class B Warrants may be offered and sold by certain stockholders
of the Company named herein (the "Selling Securityholders") from time to time in
transactions on the Nasdaq National Market or other exchanges or markets on
which the Shares or Class B Warrants may be traded, in the over-the-counter
market, in negotiated transactions, through the writing of options on the Shares
or a combination of such methods of sale or through other means. Sales may be
effected 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
negotiated prices.

                 The Selling Securityholders may effect such transactions by
selling the Shares or the Class B Warrants to or through broker-dealers
(including broker-dealers which may be affiliated with any such Selling
Securityholder) and such broker-dealers may receive compensation in the form of
discounts, concessions or commissions from the Selling Securityholders or the
purchasers of the Shares or Class B Warrants for whom such broker-dealers may
act as agent or to whom they sell as principal or both (which compensation to a
particular broker-dealer might be in excess of customary commissions). See
"Selling Securityholders" and "Plan of Distribution."

                 None of the proceeds from the sale of the Shares or the Class B
Warrants by the Selling Securityholders will be received by the Company although
the Company will receive proceeds from any exercise of the Class B Warrants or
other warrants. The Company has agreed to bear certain expenses in connection
with the registration and sale of the Shares and Class B Warrants being offered
by the Selling Securityholders. The Company has agreed to indemnify certain of
the Selling Securityholders against certain liabilities, including certain
liabilities under the Securities Act of 1933, as amended.

                 The Common Stock and Class B Warrants trade on the Nasdaq
National Market under the symbols IPIC and IPICZ, respectively. On March 14,
1996, the last sale prices of the Shares and Warrants were $313/8 and $26,
respectively.

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


          THE SECURITIES OFFERED HEREBY INVOLVE A HIGH DEGREE OF RISK.
           SEE "RISK FACTORS" BEGINNING ON PAGE 7 OF THIS PROSPECTUS.

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


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


                  The date of this Prospectus is March __, 1996

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<PAGE>

                              AVAILABLE INFORMATION

                 The Company has filed with the Securities and Exchange
Commission (the "Commission"), Washington, D.C. a Registration Statement on Form
S-3 under the Act covering the securities offered by this Prospectus. This
Prospectus does not contain all of the information set forth in the Registration
Statement and the exhibits thereto. Statements contained in this Prospectus as
to the contents of any contract or other document referred to are not
necessarily complete and in each instance such statement is qualified by
reference to each such contract or document. 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 and other
information with the Commission. Reports and other information filed by the
Company with the Commission can be inspected and copies at the public reference
facilities maintained by the Commission at the following addresses: New York
Regional Office, Seven World Trade Center, New York, New York 10048; and Chicago
Regional Office, Northwestern Atrium Center, 500 West Madison Street, Chicago,
Illinois 60661-2511. Copies of such material can be obtained from the Public
Reference Section of the Commission at 450 Fifth Street, N.W., Washington, D.C.
20549 at prescribed rates.

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

                 The following documents filed with the Commission (File No.
0-18728) pursuant to the Exchange Act are incorporated herein by reference:

               1. The  Company's  Annual Report on Form 10-K and Form 10-K/A for
the fiscal year ended  September  30, 1995,  including any documents or portions
thereof incorporated by reference therein and all amendments thereto;

                 2. The Company's definitive proxy statement dated January 26,
1996, except the Compensation Committee Report on executive compensation and the
performance graph included in the proxy statement, filed pursuant to Section 14
of the Exchange Act;.

               3. The  Company's  Reports on Form 8-K dated January 18, 1996 and
February 7, 1996 and Form 8-K/A dated February 20, 1996;

               4. The  Company's  Quarterly  Report on Form 10-Q for the quarter
ended December 31, 1995;

               5. The  Company's  Registration  Statement  on Form 8-A  declared
effective on March 8, 1990, as amended,  registering  the Common Stock under the
Exchange Act; and

               6. All documents filed by the Company pursuant to Sections 13(a),
13(c), 14 or 15(d) of the Exchange Act subsequent to the date of this Prospectus
and prior to the termination of this offering, except the Compensation Committee
Report on Executive Compensation and the performance graph included in the Proxy
Statement filed pursuant to Section 14 of the Exchange Act.

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<PAGE>

               Any statement contained in any document incorporated or deemed to
be incorporated by reference herein shall be deemed to be modified or superseded
for purposes of this Prospectus to the extent that a statement  contained herein
or in  any  subsequently  filed  document  which  also  is or  is  deemed  to be
incorporated by reference herein modifies or supersedes such statement. Any such
statement so modified or superseded  shall not be deemed,  except as modified or
superseded,  to constitute a part of this  Prospectus.  The Company will provide
without charge to each person to whom this Prospectus is delivered, upon written
or oral  request  of any  such  person,  a copy  of any or all of the  documents
incorporated  herein by reference  (other than exhibits to such documents  which
are not specifically  incorporated by reference into such  documents).  Requests
for such  documents  should  be  directed  to the  Company,  99  Hayden  Avenue,
Lexington,  Massachusetts 02173, Attention:  Chief Financial Officer,  telephone
(617) 861-8444.

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<PAGE>

                               PROSPECTUS SUMMARY

                                   The Company

               Interneuron   Pharmaceuticals,    Inc.   ("Interneuron")   is   a
diversified   biopharmaceutical   company   engaged  in  the   development   and
commercialization  of a portfolio  of products  primarily  for the  treatment or
management of central nervous system  disorders.  Interneuron is also developing
diverse technologies and products through four subsidiaries,  Intercardia,  Inc.
("Intercardia")  Progenitor, Inc. ("Progenitor"),  Transcell Technologies,  Inc.
("Transcell"), and InterNutria, Inc. ("InterNutria").  The technology or product
areas of the subsidiaries include:  cardiovascular and pulmonary disease through
Intercardia;  gene  therapy,  growth  factors and stem cell  production  through
Progenitor;  combinatorial chemistry,  drug discovery and drug transport through
Transcell; and dietary supplements and related products through InterNutria.

                 Interneuron's strategy emphasizes the development of
pharmaceutical products with significant clinical data or international market
experience and which may provide treatments for disorders or diseases which are
not adequately addressed by available therapies. Interneuron focuses on
developing products that mimic or affect neurotransmitters, which are chemicals
carrying messages between nerve cells of the brain and within the peripheral
nervous system and which are believed to influence behavior and neurological
disturbances. A drug or other treatment that either increases or decreases the
amount of a neurotransmitter released into or taken up by a synapse, or mimics
the neurotransmitter, will thereby usually affect certain behaviors which depend
on the nerve cells that release the neurotransmitter. Many neurological and
psychiatric disorders are believed to be related to the level or functioning of
neurotransmitters. The Company believes that treatments for many of these
disorders are unavailable, ineffective or inadequate. Accordingly, the Company
has developed and is developing products tailored to treat many such disorders,
including with the aim of developing treatments which are more effective or
which have an improved side effect profile compared to available treatments.

                 In addition, Interneuron is pursuing a strategy of
diversification within the healthcare field by acquisition, in-licensing and
establishing and providing initial funding to its Subsidiaries to conduct
research and development in specialized areas. The Company's goal is for its
subsidiaries to establish independent operations and financing through corporate
alliances, equity or third party financings, mergers or other business
combinations, with Interneuron generally retaining an ongoing equity interest.
The nature of any such transaction is expected to vary depending on the business
and capital needs of each Subsidiary and the stage of development of their
respective technologies or products.

                 The Company's lead pharmaceutical product is dexfenfluramine, a
prescription drug intended for use in the treatment of obesity. In November
1995, an advisory committee of the Food and Drug Administration ("FDA") voted
6-to-5 to recommend the approval of dexfenfluramine as a prescription treatment
for obesity. The advisory committee also recommended that Phase IV, or post
marketing, studies be conducted and that certain labeling guidelines be
implemented. The Company obtained exclusive U.S. rights to dexfenfluramine for
this use from Les Laboratoires Servier, a French pharmaceutical company

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<PAGE>

("Servier").  If FDA approval is  obtained,  the drug is expected to be marketed
under the tradename Redux(TM) by American Home Products Corp. (formerly American
Cyanamid Company)  ("AHP"),  which licensed from the Company exclusive rights to
market  dexfenfluramine  in the U.S. in exchange for  royalties on product sales
and a series of  milestone-related  cash  payments and equity  investments.  The
Company retained certain  co-promotion  rights.  The Company also has a contract
manufacturing   agreement  with  Boehringer  Ingelheim   Pharmaceuticals,   Inc.
("Boehringer")   relating  to  the  manufacture  of  dexfenfluramine   capsules.
Dexfenfluramine  is currently  marketed by Servier in over 40 countries  outside
the U.S.
                 Interneuron may continue to establish collaborations with
leading pharmaceutical companies to develop and commercialize certain products,
while directly marketing other products, depending upon, among other factors,
the extent and cost of clinical development required and the nature of the
target market.

                 Other principal products or products under development by the
Company include:

               CITICOLINE - a product  under  development  for the  treatment of
memory and motor  impairment  associated with ischemic  stroke.  This product is
currently  marketed by third parties in several  countries  outside the U.S. and
the Company has rights for certain  applications in the U.S. and Canada. A Phase
II/III  clinical  trial for this product with patients  suffering  from ischemic
stroke was recently  completed,  and another  clinical trial has commenced.  See
"Recent Developments."

                 BUCINDOLOL - a drug under development by Intercardia and
currently in a Phase III clinical trial (the "BEST Study") for treatment of
congestive heart failure. The BEST Study is being conducted by a division of the
National Institutes of Health ("NIH") and by the Department of Veterans Affairs
("VA"). Intercardia licensed exclusive worldwide rights to bucindolol and
entered into an agreement with Astra Merck Inc. ("Astra Merck") for the
development, commercialization and marketing of a twice-daily formulation of
bucindolol for congestive heart failure in the U.S.

                 LOW-DOSE MELATONIN - The Company is developing a low-dose form
of melatonin, a naturally occurring hormone regulating the body's circadian
rhythm, expected to be marketed under the name Melzone(TM). This product may be
useful as a sleeping aid. The Company expects to conduct a regional test launch
of Melzone in 1996.

                 PMS ESCAPE(TM) - a dietary supplement for women during their
pre-menstrual period which InterNutria is test launching on a regional basis in
1996.

                 PAGOCLONE - a drug under development as an anti-anxiety drug. A
Phase I trial in the United Kingdom has been completed and the Company expects
to begin a Phase II trial in the United Kingdom in 1996.

                 The Company was originally incorporated in New York in October
1988 and in March 1990 was reincorporated in Delaware. The Company's executive
offices are located at One Ledgemont Center, 99 Hayden Avenue, Suite 340,
Lexington, Massachusetts 02173, and its telephone number is (617) 861-8444.

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<PAGE>

Unless the context  indicates  otherwise,  all references to the Company include
Interneuron  and  its  subsidiaries,  Intercardia,  Progenitor,  Transcell,  and
InterNutria (the "Subsidiaries").
                               Recent Developments

                 In February 1996, the Company announced preliminary results of
a recently completed clinical trial with citicoline. The preliminary results
indicated a statistically significant improvement in the recovery of patients
who suffered an ischemic stroke and were treated with citicoline compared to
patients who received placebo. Once the results are finalized, the Company
intends to review the findings with the FDA and to define with them the nature
and extent of any additional studies that may be required.

                 Effective March 15, 1996, Elizabeth Tallett resigned as
President and Chief Executive Officer of Transcell. The Company and Ms. Tallett
agreed to various severance, acceleration of stock and option vesting and
related provisions. Glenn L. Cooper, M.D., the Company's President and Chief
Executive Officer, will temporarily also act as President and Chief Executive
Officer of Transcell.

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<PAGE>

                                  RISK FACTORS

                 An investment in the securities offered hereby is speculative
in nature and involves a high degree of risk. Each prospective investor should
carefully consider the following risk factors, as well as others described
elsewhere or incorporated by reference in this Prospectus, associated with this
offering, before making an investment.

                 HISTORY OF LOSSES; ACCUMULATED DEFICIT AND ANTICIPATED FUTURE
LOSSES; POTENTIAL FLUCTUATIONS IN REVENUES. The Company is engaged primarily in
research and development activities and its only revenues from operations have
been license fees or expense reimbursements. At December 31, 1995, the Company
had accumulated net losses of approximately $82 million and significant losses
and decreases in working capital are continuing. The Company will be required to
conduct significant development and pre-clinical or clinical testing activities
and establish regulatory, marketing, sales and administrative capabilities for
many of its proposed products, which are expected to result in operating losses
for the foreseeable future. The extent of future losses and time required to
achieve profitability are highly uncertain. There can be no assurance that the
Company will be able to achieve profitability on a sustained basis, if at all.
The Company has experienced, and may continue to experience, fluctuations in
revenues as a result of the timing of license fees or milestone payments.

                 RISK RELATING TO COMMERCIALIZATION OF DEXFENFLURAMINE. The
Company's future success may depend in large part on whether dexfenfluramine
ultimately receives FDA approval and is marketed successfully. Various factors
will affect the Company's ability to commercialize dexfenfluramine, including
the following:

                         REGULATORY REQUIREMENTS. FDA approval is required
                 before marketing of dexfenfluramine can commence in the United
                 States. In November 1995, an advisory committee of the FDA
                 voted 6-to-5 to recommend approval of dexfenfluramine as a
                 prescription treatment for obesity. However, there can be no
                 assurance that dexfenfluramine will receive FDA approval or as
                 to the timing of such approval, if obtained. The advisory
                 committee also recommended that if the drug is approved, Phase
                 IV, or post marketing, studies be conducted and certain
                 labeling guidelines be implemented. The precise nature of these
                 studies and labeling guidelines has not yet been determined.
                 However, Interneuron expects that the studies may be designed
                 to address two principal safety issues, i.e., whether
                 dexfenfluramine is associated with certain neurochemical
                 changes in the brain or with the development of primary
                 pulmonary hypertension, a rare but serious lung disease. These
                 safety issues and other factors may also affect the labeling
                 for the drug, which may limit the market for and the claims
                 that may be made in marketing the drug.

                         DEPENDENCE ON AHP FOR MARKETING. The ability to
                 commercialize Redux, assuming FDA approval is obtained, will
                 depend to a significant extent on the marketing and sales
                 efforts of AHP, over which the Company has minimal control. The
                 Company's agreements with Servier require launch of the product
                 within six months after an approval letter from the FDA is 

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<PAGE>

                 obtained. There can be no assurance that AHP will devote
                 resources to dexfenfluramine sufficient to achieve successful 
                 market penetration and acceptance, that the Company will
                 generate significant revenues from royalties, or that such
                 royalties will be sufficient to offset the Company's
                 significant investment in research and development and other
                 costs associated with dexfenfluramine. AHP has the right to 
                 terminate the Sublicense Agreements at any time prior to
                 commercial introduction of dexfenfluramine or at any time after
                 commercial introduction on 12 months notice. Any such 
                 cancellation would materially adversely affect the Company's
                 ability to commercialize dexfenfluramine.

                         EFFECT OF CONTROLLED SUBSTANCES ACT AND SIMILAR STATE
                 REGULATIONS. Fenfluramine and its isomers, including
                 dexfenfluramine, are currently designated as Schedule IV
                 substances under the Controlled Substances Act. This act
                 imposes various registration and record keeping requirements
                 and restricts the number of prescription refills. In September
                 1995, an advisory committee of the FDA recommended the removal
                 of fenfluramine and its isomers from these controls. However,
                 there can be no assurance as to whether descheduling will occur
                 or as to the timing of such descheduling. Further, state
                 descheduling actions are required by many states even after
                 federal descheduling. Assuming FDA approval to market
                 dexfenfluramine is obtained, the continued status of
                 dexfenfluramine as a controlled substance would adversely
                 affect the marketability of the drug and would result in
                 reduced and/or delayed milestone payments, equity investments
                 and royalties to the Company under its agreements with AHP (the
                 "Sublicense Agreements").

                         DEPENDENCE ON SUPPLIERS. The Company is required to
                 purchase for five years from commercial introduction all
                 requirements of dexfenfluramine bulk chemical from an affiliate
                 of Servier at a fixed price, subject to annual adjustments
                 based on Servier's cost. The Company is also required to
                 purchase until December 1998 all requirements of
                 dexfenfluramine capsules from Boehringer. The Company is
                 responsible for supplying AHP with its requirements for
                 dexfenfluramine in bulk chemical or finished product form, as
                 required by AHP. Accordingly, the Company will be materially
                 dependent on the ability of each of Servier and Boehringer to
                 have manufactured and delivered, on a timely basis, sufficient
                 quantities of bulk chemical and capsules, respectively. In the
                 event the Company is unable to deliver to AHP sufficient
                 quantities of dexfenfluramine capsules, the Company's business
                 and results of operations would be materially adversely
                 affected.

                         COMPETITION. Redux may be subject to substantial
                 competition from established pharmaceutical companies. The
                 Company is aware of drugs under development for the treatment
                 of obesity including sibutramine, for which BASF AG has filed
                 an NDA to treat obesity, a drug under development by Roche
                 Holdings Ltd. that is in clinical trials, and a drug for which
                 Neurogen Corporation has filed an IND. In addition,
                 dexfenfluramine is an isomer of fenfluramine, which is sold
                 under the brand name Pondimin by AHP and which is available in
                 the United States for approximately the same use as 

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<PAGE>

                 dexfenfluramine. Although dexfenfluramine is distinguishable
                 from fenfluramine, there can be no assurance that
                 dexfenfluramine, which is expected to be higher priced then
                 fenfluramine, will ultimately achieve greater market
                 acceptance than fenfluramine or any other prescription drug
                 used to treat obesity. In addition, other drugs and
                 technologies relating to the treatment of obesity are in
                 earlier stages of development.

                         PATENT EXPIRATION. The composition of matter patent on
                 dexfenfluramine in the United States has expired and
                 competitors, including generic drug manufacturers, may market
                 dexfenfluramine claiming uses other than obesity related to
                 abnormal carbohydrate craving, assuming FDA approval can be
                 obtained. The use patent on dexfenfluramine for the treatment
                 of abnormal carbohydrate craving, which has been licensed to
                 the Company, expires in 2000. There can be no assurance that
                 this patent will afford any competitive advantage or will not
                 be challenged or circumvented by third parties. The Company's
                 minimum royalty obligations to Servier for the license of the
                 know-how and trademark extend beyond the patent expiration
                 date. This royalty payment obligation may adversely affect the
                 Company's ability to compete against any then available generic
                 drugs that are offered at lower prices.

                         TERMINATION OF AGREEMENTS. The Company's agreements
                 with Servier (the "Servier Agreements") may be terminated by
                 Servier under certain conditions, including an acquisition by a
                 new party (other than existing stockholders or their affiliates
                 as of the date of the Servier Agreements) of a 20% beneficial
                 ownership interest in the Company without Servier's consent.
                 The Servier Agreements also require Servier's consent to a
                 Company sublicense, which consent was obtained in connection
                 with the Sublicense Agreements. However, Servier has the right
                 to withdraw its consent to the Sublicense Agreements in the
                 event of a change in control of AHP or unless certain minimum
                 net sales are achieved or payments are made as if such minimum
                 sales were achieved. In the event of a breach of the Servier
                 Agreements by the Company which is not caused by AHP, or of
                 other specified events which result in the termination of the
                 Servier Agreements, AHP may succeed to the Company's position
                 under the Servier Agreements. AHP has the right to terminate
                 its sublicense at any time prior to its first commercial sale
                 of dexfenfluramine or, upon 12 months notice, after such first
                 commercial sale. The termination of either agreement would
                 likely have a material adverse effect on the Company.

                 NEED FOR SIGNIFICANT ADDITIONAL FUNDS AND COLLABORATIVE
ARRANGEMENTS. The Company has expended and will continue to expend substantial
funds to conduct research and development activities and pre-clinical and
clinical testing on products under development. In addition, the Company does
not have the resources or capability to manufacture or market by itself, on a
commercial scale, its proposed products. Accordingly, the Company will require
significant additional funds, either through additional equity or debt
financings or collaborative agreements with corporate sponsors or from other
sources to complete development or commence commercial scale manufacturing and
marketing of its proposed products. In addition, additional funds will be

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<PAGE>

required to finance the research and development projects of certain of the
Company's subsidiaries. The Company may ultimately establish its own
manufacturing or marketing capabilities for certain of its products, in which
case it will require substantial additional funds and personnel. In particular,
the Company will seek to co-promote Redux and currently intends to market
directly citicoline, Melzone(TM) and PMS Escape(TM), assuming applicable
regulatory approvals are obtained and test launches are successful. The Company
will therefore be required to establish and maintain appropriate internal sales
forces. The Company currently does not have any commitments for additional
financing and there can be no assurance that such financing will be available on
acceptable terms, if at all. If adequate funds are not available on acceptable
terms, the Company may be required to delay, scale back or eliminate one or more
of its product development programs.


                 EARLY STAGE OF PRODUCT DEVELOPMENT. The Company is engaged in
investigating a variety of technologies, pharmaceutical compounds and other
products or processes for therapeutic potential. There has been only limited
research in many areas of the Company's focus and results obtained in research
and testing conducted to date are not conclusive as to whether certain products
being investigated by the Company will be safe and effective for their proposed
use. Certain of the Company's proposed products are in the early developmental
stage, require significant further research and development, as well as testing
and regulatory clearances, and are subject to the risks of failure inherent in
the development of products or therapeutic procedures based on innovative
technologies. These risks include the possibilities that any or all of these
proposed products are found to be ineffective or toxic, or otherwise fail to
receive necessary regulatory clearances; that the proposed products or
procedures are uneconomical to market or do not achieve broad market acceptance;
that third parties hold proprietary rights that preclude the Company from
marketing them; or that third parties market a superior or equivalent product.
The Company is unable to predict whether any of its products will be
successfully manufactured or marketed . Further, due to the extended testing and
regulatory review process required before marketing clearance can be obtained,
the time frames for commercialization of any products or procedures are long and
uncertain.

                 UNCERTAINTIES RELATED TO CLINICAL TRIALS. Before obtaining
regulatory approval for the commercial sale of any of its pharmaceutical
products under development, the Company must demonstrate that the product is
safe and efficacious for use in each target indication. The results of
preclinical studies and early clinical trials may not be predictive of results
that will be obtained in large-scale testing, and there can be no assurance that
clinical trials of the Company's products will demonstrate the safety and
efficacy of its products or will result in marketable products. A number of
companies in the pharmaceutical industry have suffered significant setbacks in
advanced clinical trials, even after promising results in earlier trials. If the
Company were unable to demonstrate the safety and efficacy of certain of its
products, the Company may be adversely affected. The Company also expects to
conduct clinical evaluation on certain dietary supplement products under
development by InterNutria, which are subject to similar risks.

                 RISKS RELATING TO TEST LAUNCHES OF PRODUCTS. The Company is
conducting and intends to conduct regional test launches of certain
non-pharmaceutical products during 1996, including PMS Escape, a dietary 

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<PAGE>

supplement for women with pre-menstrual syndrome which is continuing to be
clinically evaluated, and Melzone, a low-dose formulation of melatonin. Based on
the results of these test launches, the Company may determine not to market the
product, to conduct additional testing of the product or to market the product
on a broader scale. There can be no assurance either of these test launches will
be successful, or if successful, be predictive of the commercial viability of
either product if marketed more broadly.

                 UNCERTAINTY OF GOVERNMENT REGULATION. The Company's research,
development and pre-clinical and clinical trials and the manufacturing and
marketing of most of its products are subject to an extensive regulatory
approval process by the FDA and other regulatory agencies in the U.S. and other
countries. The process of obtaining FDA and other required regulatory approvals
for drug and biologic products, including required pre-clinical and clinical
testing, is lengthy, expensive and uncertain. There can be no assurance that,
even after such time and expenditures, the Company will be able to obtain
necessary regulatory approvals for clinical testing or for the manufacturing or
marketing of any products. Even if regulatory clearance is obtained, post-market
evaluation of the products, if required, could result in restrictions on a
product's marketing or withdrawal of the product from the market as well as
possible civil or criminal sanctions. Certain products are proposed to be
marketed by the Company as dietary supplements, such as Melzone and PMS Escape.
There can be no assurance, however, that the FDA will not attempt to regulate
the products as drugs, which would require the filing of NDAs and review and
approval by the FDA prior to marketing, or otherwise restrict the marketing of
these products. In addition, classification of these products as dietary
supplements limits the types of claims that can be made in marketing.

                 In addition to the regulatory framework for product approvals,
the Company and its collaborative partners may be subject to regulation under
state and federal laws, including requirements regarding occupational safety,
laboratory practices, environmental protection and hazardous substance control,
and may be subject to other present and possible future local, state, federal
and foreign regulation. The impact of such regulation upon the Company cannot be
predicted and could be material and adverse.

                 DEPENDENCE ON OTHERS FOR CLINICAL DEVELOPMENT, REGULATORY
APPROVALS, MANUFACTURING AND MARKETING. The Company expects to rely upon
collaborative partners for the development, manufacturing and marketing of
certain of its products. The Company is therefore dependent on the efforts of
these collaborative partners and the Company may have limited control over the
manufacture and commercialization of such products. For example, with respect to
bucindolol, the Company does not control the BEST Study, which is being
conducted by the NIH and the VA, and will be substantially dependent upon Astra
Merck for the commercial success of the twice-daily formulation of bucindolol.
In the event certain of the Company's collaborative partners terminate the
related agreements or fail to manufacture or commercialize products, the Company
would be materially adversely affected. Because the Company will generally
retain a royalty interest in sales of products licensed to third parties, its
revenues may be less than if it retained commercialization rights and marketed
products directly. Although the Company believes that its collaborative partners
will have an economic motivation to commercialize the products which they may
license, the amount and timing of resources devoted to these activities


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<PAGE>

generally will be controlled by each partner. There can be no assurance that the
Company will be successful in establishing any additional collaborative
arrangements, or that any such collaborative partners will be successful in
commercializing products or not terminate their collaborative agreements with
the Company.

                 RISKS RELATING TO MANAGING GROWTH. Assuming proposed product
launches occur, the Company anticipates experiencing a period of rapid growth,
which is likely to place significant demands on the Company's management,
operational, financial and accounting resources. The Company's intention to
market certain products directly will further strain these resources. The
Company's future success will depend in part on whether it can expand its
operational, financial and accounting systems and expand, train and manage its
employee base. The Company's inability to manage growth effectively could have a
material adverse effect on the Company's business, financial condition and
results of operations.

                 COMPETITION. Competition from other pharmaceutical companies,
biotechnology companies, dietary supplement companies and other research and
academic institutions is intense and expected to increase. The Company is aware
of products and technologies under development by its competitors that address
diseases being targeted by the Company. For example, if regulatory approval is
obtained, bucindolol is expected to compete with carvedilol, which is expected
to be marketed in the U.S. by Smithkline Beecham, for the treatment of
congestive heart failure, and the patient enrollment rate of the BEST Study will
be adversely affected if carvedilol is approved by the FDA as a treatment for
congestive heart failure. In addition, Melzone will compete with a substantial
number of available melatonin products. The Company is aware of a number of
products in clinical development pursuing an indication for stroke which could
compete with citicoline. Many companies in this industry have substantially
greater financial resources and development capabilities than the Company and
have substantially greater experience in undertaking pre-clinical and clinical
testing of products, obtaining regulatory approvals and manufacturing and
marketing products. In addition to competing with universities and other
research institutions in the development of products, technologies and
processes, the Company may compete with other companies in acquiring rights to
products or technologies from universities. Competitors of the Company have
developed or are in the process of developing products or technologies that are,
or in the future may be, the basis for competitive products. There can be no
assurance that the Company will develop products that are more effective or
achieve greater market acceptance than competitive products, or that the
Company's competitors will not succeed in developing products and technologies
that are more effective than those being developed by the Company or that would
render the Company's products and technologies less competitive or obsolete.

                 UNCERTAINTY OF PATENT POSITION AND PROPRIETARY RIGHTS. The
Company's success will depend to a significant extent on its ability, or the
ability of its licensors, to obtain patent protection on technologies and
products and preserve trade secrets and to operate without infringing the
proprietary rights of others. The Company and its subsidiaries have rights to a
number of patents and patent applications. Certain of these patents and patent
applications include biotechnology claims, the patentability of which generally
is highly uncertain and involves complex legal and factual questions. There can
be no assurance that any pending patent applications will result in the

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<PAGE>

issuance of a patent or that any patents issued will afford any competitive
advantages or will not be challenged or circumvented by third parties. Because
of the extensive time required for development, testing and regulatory review of
a potential product, it is possible that before a potential product can be
commercialized, any related patent may expire, or remain in existence for only a
short period following commercialization, thus reducing any advantage of the
patent. For example, the U.S. composition of matter patent on bucindolol expires
in November 1997, before anticipated completion of clinical trials of the
product. In addition, the Company's licensed United States patent covering the
administration of citicoline to treat patients afflicted with conditions
associated with the inadequate release of brain acetylcholine expires in 2003.
As described in the licensed patent, such conditions may include the
neurological syndromes associated with brain traumas and stroke, but the claims
of the licensed patent do not specifically include the use of citicoline for the
indications for which the IND has been filed.

                 The Company may conduct research on pharmaceutical or chemical
compounds or technologies, the patents or other rights to which may be held by
third parties. If products based on such technologies are commercialized, they
may infringe such patents or other rights, licenses to which may not be
available to the Company. Failure to obtain needed patents, licenses or
proprietary information held by others may have a material adverse effect on the
Company's business. There can be no assurance that others will not independently
develop similar technologies or duplicate any technology developed by the
Company or, if patents are issued, design around the patented aspects of any
technology developed by the Company. Furthermore, litigation may be necessary to
enforce any patents issued to the Company or to determine the scope and validity
of the proprietary rights of others.

                 To the extent that consultants, key employees or other third
parties apply technological information independently developed by them or by
others to the Company's proposed projects, disputes may arise as to the
proprietary rights to such information which may not be resolved in favor of the
Company. The Company's Scientific Advisors and certain other consultants are
employed by or have consulting agreements with third parties and any inventions
discovered by such individuals generally will not become property of the
Company. There can be no assurance that Company confidentiality agreements will
not be breached or that the Company's trade secrets will not otherwise become
known or be independently discovered by competitors.

                 UNCERTAINTY REGARDING WAXMAN-HATCH ACT. The Drug Price
Competition and Patent Term Restoration Act of 1984 (the "Waxman-Hatch Act")
provides that a patent which claims a product, use or method of manufacture
covering certain drugs and certain other products may be extended for up to five
years to compensate the patent holder for a portion of the time required for
research and FDA review of the product. Although the Company expects to apply
for such protection for the use patent covering dexfenfluramine, there can be no
assurance that it will receive an extension. The Waxman-Hatch Act also
establishes a period of time from the date of FDA approval of certain new drug
applications during which the FDA may not accept or approve short-term
applications for generic versions of the drug from other sponsors, although it
may accept or approve long-form applications (that is, other complete NDAs) for


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<PAGE>

such drug. There can be no assurance that any of the benefits of the
Waxman-Hatch Act or similar foreign laws will be available to the Company or
that such laws will not be amended or repealed.

                 DEPENDENCE UPON KEY PERSONNEL AND CONSULTANTS. The Company is
dependent on certain executive officers and scientific personnel, including
Glenn L. Cooper, M.D., the Company's President and Chief Executive Officer,
Richard Wurtman, M.D., a principal stockholder, director and Chairman of the
Scientific Advisors and Lindsay Rosenwald, M.D., the Chairman of the Board of
the Company. The Company has key person life insurance policies on the lives of
Drs. Wurtman, Rosenwald and Cooper. Drs. Wurtman and Rosenwald devote only a
portion of their time to the Company's business. In addition, the Company is
dependent upon certain executive officers or scientific personnel of the
Subsidiaries, each of which has separate management who are responsible, to a
large extent, for the day-to-day operations of the respective Subsidiary. In
addition, the Company relies on independent consultants to design and supervise
clinical trials and prepare FDA submissions.

                 Competition for qualified employees among pharmaceutical and
biotechnology companies is intense, and the loss of any of such persons, or an
inability to attract, retain and motivate additional highly skilled employees,
could adversely affect the Company's business and prospects. There can be no
assurance that the Company will be able to retain its existing personnel or to
attract additional qualified employees.

                 RISK OF PRODUCT LIABILITY. The use of the Company's products in
clinical trials and the marketing of any products may expose the Company to
substantial product liability claims. Certain of the Company's agreements
require the Company to obtain specified levels of insurance coverage, naming the
other party thereto as an additional insured. There can be no assurance that the
Company will be able to obtain such insurance coverage with respect to
dexfenfluramine or any other products, or if obtained, that such insurance can
be acquired in sufficient amounts to protect the Company or other named parties
against such liability or at a reasonable cost. The Company is required to
indemnify Servier, Boehringer and AHP against any claims, damages or liabilities
incurred by any of them in connection with the marketing of dexfenfluramine
under certain circumstances. The Company may also be required to indemnify other
licensors against product liability claims incurred by them as a result of
products developed by the Company under licenses from such entities. In the
event of an uninsured or inadequately insured product liability claim, or in the
event an indemnification claim was made against the Company, the Company's
business and financial condition could be materially adversely affected.

                 UNCERTAINTY REGARDING PHARMACEUTICAL PRICING AND REIMBURSEMENT.
The Company's business and financial condition will be affected by the efforts
of governmental and third-party payors to contain or reduce the cost of health
care. There have been, and the Company expects that there will continue to be, a
number of federal and state proposals to implement government control over the
pricing or profitability of prescription pharmaceuticals, as is currently the
case in many foreign markets. While the Company cannot predict whether any such
legislative or regulatory proposals will be adopted or the effect such proposals
may have on its business, the announcement or adoption of such proposals could

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<PAGE>

have an adverse effect on the Company. Furthermore, the Company's ability to
commercialize its potential products may be adversely affected to the extent
that such proposals have a material adverse effect on the business, financial
condition and profitability of companies that are prospective collaborative
partners of the Company. Successful commercialization of many of the Company's
products may depend on the availability of reimbursement for the cost of such
products and related treatment from third-party health care payors, such as the
government, private insurance plans and managed care organizations. There can be
no assurance that such reimbursement will be available. Such third-party payors
are increasingly challenging the price of medical products and services.
Significant uncertainty exists as to the reimbursement status of certain newly
approved health care products, and there can be no assurance that adequate
third-party coverage will be available with respect to any of the Company's
products.

                 CONTROL BY PRESENT STOCKHOLDERS; ANTI-TAKEOVER PROVISIONS. The
officers, directors and principal stockholders of the Company (including
individuals or entities related to such stockholders) beneficially own
approximately 50% of the Company's outstanding Common Stock. Accordingly, these
officers, directors and stockholders may have the ability to exert significant
influence over the election of the Company's Board of Directors and to determine
corporate actions requiring shareholder approval.

                 The Board of Directors has the authority, without further
approval of the Company's stockholders, to fix the rights and preferences of and
to issue shares of preferred stock. Further, the Servier Agreements may be
terminated in the event of any acquisition by a new party (other than existing
stockholders or their affiliates as of the date of the Servier Agreements) of a
20% beneficial interest in the Company. In addition, Delaware corporate law
imposes limitations on certain business combinations. These provisions could,
under certain circumstances, have the effect of delaying or preventing a change
in control of the Company and, accordingly, could adversely affect the price of
the Company's Common Stock.

                 NO DIVIDENDS. The Company has not paid any cash dividends on
its Common Stock since inception and does not expect to do so in the foreseeable
future. Any dividends will be subject to the preferential cumulative dividend of
$.1253 per share and $1.00 per share payable on the outstanding Series B
Preferred Stock and Series C Preferred Stock, respectively, and dividends
payable on any other preferred stock issued by the Company.

                 POSSIBLE VOLATILITY OF STOCK PRICE. The market prices for
securities of emerging growth companies have historically been highly volatile.
Future announcements concerning the Company or its Subsidiaries, including
Intercardia, which is publicly-traded, or the Company's competitors, including
the results of testing and clinical trials, technological innovations or
commercial products, government regulations, developments concerning proprietary
rights, litigation or public concern as to the safety or commercial value of the
Company's products, may have a significant impact on the market price of the
Company's Common Stock or Class B Warrants.

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                                 USE OF PROCEEDS

                 The Company will not receive any proceeds from the sale of the
Shares or the Class B Warrants by the Selling Securityholders. In the event that
all of the Class B Warrants and other warrants exercisable for Shares offered
hereby are exercised, the Company would receive additional proceeds of
approximately $2,781,000. Holders of warrants are not obligated to exercise
their warrants and there can be no assurance that warrantholders will choose to
exercise all or any of the warrants.

                 The Company will use proceeds received upon exercise of
warrants, if any, for working capital. The Company may also use proceeds to
acquire rights to new products and technologies.

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<PAGE>


                             SELLING SECURITYHOLDERS

      The following table sets forth the names of each Selling Securityholder
and for each, the number of Shares and/or Class B Warrants beneficially owned at
the commencement of the offering, and the number of Shares and/or Class B
Warrants offered for sale, based on information provided to the Company by such
Selling Securityholders. The Shares and Class B Warrants are being registered to
permit public secondary trading of the Shares and/or Class B Warrants, and the
Selling Securityholders may offer the Shares and Class B Warrants for resale
from time to time. See "Plan of Distribution."

      The Company has filed with the Commission under the Act a Registration
Statement on Form S-3, of which this Prospectus forms a part, with respect to
the resale of the Shares and/or Class B Warrants. The Company has agreed, among
other things, to bear certain expenses in connection with the registration and
sale of the Shares and Class B Warrants being offered by the Selling
Securityholders. See "Plan of Distribution."

      Certain of the Selling Securityholders hold warrants (other than the Class
B Warrants) issued by the Company which, upon exercise, allow such Selling
Securityholder to purchase shares of Common Stock. Such Selling Securityholders
are expected to exercise their warrants and pay for their shares of Common Stock
immediately prior to offering such Shares pursuant to this Prospectus.

      None of the Selling Securityholders are officers or directors of the
Company except that Alexander M. Haig, Jr. is a director of the Company. Each of
the Selling Securityholders listed below with a reference to footnote (9) is
employed by either Paramount Capital, Inc. ("Paramount"), an investment banking
firm which acted as placement agent for private placements of securities by
Company subsidiaries in fiscal 1995 or D.H. Blair & Co., Inc. ("Blair"), which
was a selected dealer in these private placements. Lindsay Rosenwald, M.D., the
Company's Chairman of the Board and a principal stockholder of the Company, is
the Chairman and sole stockholder of Paramount. Certain stockholders of Blair
(and individuals related to such stockholders) are principal stockholders of the
Company.

      During fiscal 1995 Paramount and Blair received cash commissions
aggregating $657,433 and $112,586 respectively, from these private placements.
In addition, designees of Paramount received warrants to purchase an aggregate
of (i) 22,201 shares of preferred stock of Progenitor, (ii) 22,201 shares of
preferred stock of Transcell, (iii) 46,767 shares of preferred stock of
Intercardia and (iv) 13,875 Shares (and a designee of Paramount, Peter Kash,
received warrants to purchase an additional 25,000 Shares). Of these warrants,
12,274, 12,274, 30,092 and 7,671, respectively, were received by Dr. Rosenwald.
Designees of Blair received warrants to purchase an aggregate of (i) 12,700
shares of preferred stock of Progenitor, (ii) 12,700 shares of preferred stock
of Transcell, (iii) 4,266 shares of preferred stock of Intercardia and (iv)
7,938 Shares. Certain of the Shares listed under "Placement Agent and other
Warrant Shares" are issuable upon exercise of the warrants to purchase Shares
issued in one of these private placements, as noted. Blair was the underwriter
of the Company's initial public offering in March 1990 and all of the

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<PAGE>

individuals listed under "Unit Purchase Option Securities" received the
securities listed under "Amount Being Offered" in connection with such initial
public offering.

      During fiscal 1995, the Company entered into a consulting agreement with
Paramount pursuant to which it paid a fee to Paramount of $5,000 a month until
February 1995, for an aggregate of $15,000, and granted to Timothy McInerny, a
designee and officer of Paramount, warrants to purchase 25,000 Shares. The
Shares issuable upon exercise of these warrants are being offered hereby.

      During fiscal 1995, in connection with a private placement of the
Company's securities to Reliance Insurance Company for which Paramount acted as
placement agent, the Company paid Paramount cash compensation of $300,000 and
granted to Peter Kash, a designee and officer of Paramount warrants to purchase
an additional 50,000 Shares. All of the Shares issuable upon exercise of
warrants held by Mr. Kash are being offered hereby.

      Elan Corporation, plc, an affiliate of Elan International Services Ltd.,
is a licensee of the Company and, during the fiscal years ended September 30,
1993 and 1995, paid the Company $5.4 million and $31,366, respectively, in
license fees and royalties.

      Certain of the stockholders listed under "Former CPEC Stockholders" are
also stockholders of Myocor, Inc. which, pursuant to consulting and research
agreements with subsidiaries of the Company, received fees of $10,417 and
$157,600 in fiscal 1994 and 1995, respectively, and is entitled to fees of
approximately $141,000 and $75,000 in fiscal 1996 and 1997, respectively. In
addition, one of such stockholders, Robert Ginsburg, through an affiliate, has a
consulting agreement with Intercardia.

      In connection with several private placements of Company securities in
fiscal 1995, Capello Capital Corp. received placement agent fees aggregating
approximately $507,000 and designees of Capello Capital Corp. (Linda S. Capello,
Gerard K. Capello and Lawrence K. Fleischman, each of whom are Selling
Securityholders) received warrants to purchase an aggregate of 16,000 Shares,
all of which Shares are being offered hereby.

      M&G Equities, a Selling Securityholder, is owned by two executive officers
and controlling stockholders of American Stock Transfer & Trust Company, the
transfer agent and warrant agent for the Company's Common Stock and Class B
Warrants.

      Except as noted below, each Selling Securityholder beneficially owns less
than one percent of the outstanding Common Stock.

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<PAGE>

                                               Amount
                                           Beneficially Owned      Amount
SELLING SECURITYHOLDERS                    Prior to Offering     Being Offered
                                                   Class B              Class B
IPI PRIVATE PLACEMENTS                    Shares    Warrants    Shares  Warrants
                                          -------------------------------------

     BT Holdings (New York), Inc.          312,500(1)          312,500(1)
     DFA Group Trust Small Company
       Subtrust(2)                         257,368             257,368
     DFA Group Trust-6-10 Subtrust(2)      223,806             218,406
     DFA Group Trust-6-7-8 Subtrust(2)      57,898              49,898
     U.S. 9-10 Small Company Portfolio(2)  134,948             134,948
     U.S. 6-10 Small Company Series(2)      19,666(4)           17,166
     GFL Advantage Fund Limited            579,221(3)          579,221(3)
     Paresco, Inc.                         200,000(4)          200,000(4)
     Silverton International Fund Ltd.     400,000(5)          400,000(5)

FORMER CPEC STOCKHOLDERS

     W. Bruce Bercovich                     22,554              22,554
     Arthur M. Feldman                      31,576              31,576
     Robert Ginsburg                       226,773(6)          225,543(6)
     Phillip Goodman                        22,554              22,554
     Michael Juliano                        25,627              25,627
     Milton Levin                          112,772             112,772
     Wayne Minobe                            4,510               4,510
     Maje Benjamin Perryman                  9,020               9,020
     Jonathan David Port                     4,510               4,510
     David Profitt                           4,510               4,510
     Randy P. Rasmussen                      4,510               4,510
     Mary V. Reynolds                        9,020               9,020
     Cornelis Van Breemen                   15,788              15,788
     Maud Van Breemen                       15,788              15,788
     Pauline Zera                            4,510               4,510

SUBSIDIARY PRIVATE PLACEMENT WARRANT
  SHARES(7)

     Delbert Allen Jr. & Pat Allen,
           JTWROS                            5,000               5,000
     Jerome V. Ansel                        62,800              25,000
     Bershad Investment Group, L.P.          5,000               5,000
     Benjamin Bollag                         5,000               5,000
     Michael Cantor                          5,000               5,000
     Jose F. Colon                           1,250               1,250
     Robert J. Conrads                       2,500               2,500

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                                         Amount
                                   Beneficially Owned          Amount
SELLING SECURITYHOLDERS             Prior to Offering       Being Offered
                                              Class B                Class B
                                    Shares     Warrants   Shares   Warrants
                                   ------------------------------------------

     F&T Planning Centers, Inc.          5,000             5,000
     Robert A. Foisie                    7,500             7,500
     Sandy Frank                         2,500             2,500
     Marc Gelman                        21,500            10,000
     Mildred Goldberger                  1,250             1,250
     Robert P. Gordon                    2,500             2,500
     Jeffrey S. Gutfreund                3,750             3,750
     Andrew Holder                       1,250             1,250
     James Katz, M.D.                      625               625
     Donald R. Kendall, Jr. &
          Diane S. Kendall JTWROS        1,250             1,250
     Keys Foundation                    25,000            25,000
     Momentum Enterprises Inc.
          Money Purchase Trust           2,500             2,500
     M&G Equities                       10,000            10,000
     David H. Meyrowitz                  1,250             1,250
     Palmetto Partners, Ltd.             5,000             5,000
     Thomas L. Parks &
          Easter C. Parks, JTWROS        1,250             1,250
     Gordon Rausser                      2,500             2,500
     Marc Roberts &
         Ron Cantor, Esq.,
         Tenants in Common               1,250             1,250
     Elaine Rubin                       12,500            12,500
     M.D. Sabbah                        25,000            25,000
     Roslyn Seftel                       1,250             1,250
     E. Donald Shapiro                   9,250             1,250
     J.F. Shea Co., Inc. as
         Nominee 1995-3                  7,500             7,500
     Eugene Silverman                    1,250             1,250
     Celia Sirotkin                      1,250             1,250
     Martin Sirotkin                     1,250             1,250
     Gary J. Strauss                     1,250             1,250
     Sidney Todres                       5,000             5,000
     Melvyn I. Weiss                    12,500            12,500
     Frederick Winston                   2,500             2,500
     James D. Wolfensohn                 5,000             5,000

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<PAGE>
                                          Amount
                                     Beneficially Owned            Amount
SELLING SECURITYHOLDERS              Prior to Offering         Being Offered
                                                 Class B               Class B
                                      Shares     Warrants    Shares    Warrants
                                     ------------------------------------------


     Gary Wood                        1,250                 1,250
     Wayne T. Young &
         Karen J. Young, JTWROS       1,250                 1,250
     Zapco Holdings, Inc. Deferred    5,000                 5,000
         Compensation Plan Trust;
         Nancy Heinrich, Trustee

UNIT PURCHASE OPTION 
  SECURITIES(7)(8)

     Allison Brown(9)                 2,300        600       1,800       600
     Sylvia Coakley(9)                5,000      1,500       4,500     1,500
     Stevens R. Monte                 1,800                  1,800
     David Nachamie(9)                7,000      1,500       4,500     1,500
     Michael Siciliano(9)             6,000      1,500       4,500     1,500
     Kenton Wood(9)                  19,500      6,000      18,000     6,000

PLACEMENT AGENT AND OTHER WARRANT
  SHARES (7)

     Mark Abeshouse(9)                  125                    125
     Axion Research Foundation       20,000                 20,000
     Linda N. Capello                 6,480                  6,480
     Gerard K. Capello                4,320                  4,320
     Lawrence K. Fleischman           5,200                  5,200
     Scott Katzmann(9)                1,906                  1,906
     Peter Kash(9)                  109,594(10)             76,344
     Martin Kratchmann(9)               375                    375
     Richard Maio(9)                  1,750                  1,250
     Timothy McInerny(9)             25,000                 25,000
     Wayne L. Rubin(9)                  818                    818
     Michael S. Weiss(9)              1,636                  1,636

OTHER STOCKHOLDERS

     Elan International Services
       Ltd.                          100,000               100,000
     Alexander M. Haig, Jr.          202,750(11)           202,500
     Leon Finley                     22,500                 22,500
     Yuichi Iwaki                    50,000                 50,000

H:\DOCS\BTPM_NY_\46\0043541.02
                                      -21-

<PAGE>
                                        Amount
                                    Beneficially Owned        Amount
SELLING SECURITYHOLDERS             Prior to Offering      Being Offered
                                               Class B                 Class B
                                    Shares     Warrants    Shares      Warrants
                                    -------------------------------------------

     Peter Kash(9)                   109,594(10)           52,000
     Donna Lozito(9)                   3,000                3,000
     Francine Tarnowsky(9)             3,000                3,000
     Egon Zehnder International,
       Inc.                           20,000               10,000
- ---------------

(1)      Includes 62,500 Shares underlying warrants but excludes an aggregate of
         97,900 Shares owned by affiliated entities as of February 6, 1996. The
         Shares owned directly and by affiliated entities represent an aggregate
         of approximately 1.2% of the outstanding Common Stock.

(2)      Each stockholder is a fund managed by Dimensional Fund Advisors, Inc.
         ("DFA"). DFA also has the power to vote and dispose of 8,100 shares
         held by another fund and the power to dispose of, but not vote, an
         aggregate of 12,000 shares owned by two investors (none of which shares
         are offered hereby). The aggregate percentage of outstanding shares of
         Common Stock which may be beneficially owned by DFA is approximately
         2%.

(3)      Includes shares of Common Stock issuable if the registration statement
         relating to this offering is declared effective on March 14, 1996.
         Represents approximately 1.6% of the outstanding Common Stock.

(4)      Such stockholder has agreed not to sell any Shares prior to May 23,
         1996.

(5)      Represents approximately 1.2% of the outstanding  Common Stock.
         Such stockholder has agreed not to sell any Shares prior to March 31,
         1996.

(6)      Includes 117,282 Shares owned and being offered by Savacor Trust, of
         which Mr. Ginsburg is Trustee.

(7)      The amount owned prior to the offering includes Shares outstanding and
         Shares issuable upon exercise of warrants; the amount being offered
         represents only Shares issuable upon exercise of warrants.

(8)      For each person listed under "Unit Purchase Option Securities" other
         than Mr. Monte, the number of Shares owned prior to the Offering and
         the number of Shares being offered includes the Shares issuable upon
         exercise of the Class B Warrants owned by such individual. Each
         individual other than Mr. Monte is registering for resale their Class B

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                                      -22-

<PAGE>

         Warrants and the Shares issuable upon exercise of their Class B
         Warrants. Accordingly, they may either sell the Class B Warrants or
         exercise the Class B Warrants and sell the Shares issued upon such
         exercise, or a combination of these methods.

(9)      Each individual is an employee of Paramount or Blair.

(10)     Excludes 18,750 Shares issuable upon exercise of warrants not
         exercisable within 60 days.

(11)     Includes 250 Shares issuable upon exercise of options exercisable
         within 60 days but excludes 1,750 Shares issuable upon exercise of
         options not exercisable within 60 days.

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                                      -23-

<PAGE>

                              PLAN OF DISTRIBUTION

         The Company has been advised that the Selling Securityholders may sell
Shares or the Class B Warrants from time to time in transactions on the Nasdaq
National Market or on other exchanges on which the Shares and/or Class B
Warrants may be traded, in the over-the-counter market, in negotiated
transactions, through the writing of options on the Shares or a combination of
such methods of sale, or through other means. Sales may be effected at fixed
prices which may be changed, at market prices prevailing at the time of sale, at
prices related to such prevailing market prices or at negotiated prices.

         The Selling Securityholders may effect such transactions by selling the
Shares or Class B Warrants to or through broker-dealers, and such broker-dealers
may receive compensation in the form of discounts, concessions or commissions
from the Selling Securityholders or the purchasers of the Shares or Class B
Warrants for whom such broker-dealers may act as agent or to whom they sell as
principal, or both (which compensation to a particular broker-dealer might be in
excess of customary commissions). The Selling Securityholders and any
broker-dealers or agents who participate in the distribution of Shares or Class
B Warrants hereunder may be deemed to be "underwriters" as that term is defined
in the Act, and any commissions received by them and profit on any resale of the
Shares as principal might be deemed to be underwriting discounts and commissions
under the Act.

         The Company has agreed to pay the expenses of registration in
connection with this Offering and to indemnify certain of the Selling
Securityholders against certain liabilities, including certain liabilities under
the Act.

         At the time a particular offer of Shares or Class B Warrants is made,
to the extent required, a supplement to this Prospectus will be distributed
which will identify and set forth the aggregate amount of Shares or Class B
Warrants being offered and the terms of the offering.

         The Selling Securityholders are not restricted as to the price or
prices at which they may sell their Shares or Class B Warrants. Sales of Shares
or Class B Warrants may depress the market price of the Company's Common Stock
or Class B Warrants. The Selling Securityholders are subject to applicable
provisions of the Exchange Act and the rules and regulations thereunder,
including without limitation rules 10b-6 and 10b-7, which provisions may limit
the timing of purchases and sales of the Shares or Class B Warrants by the
Selling Securityholders.

         In order to comply with certain states' securities laws, if applicable,
the Shares or Class B Warrants may be sold in such jurisdictions only through
registered or licensed brokers or dealers. In certain states the Shares or Class
B Warrants may not be sold unless the Shares or Class B Warrants have been
registered or qualified for sale in such state, or unless an exemption from
registration or qualification is available and is obtained.

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                                      -24-

<PAGE>


                            DESCRIPTION OF SECURITIES

COMMON STOCK

         The Company is authorized to issue up to 60,000,000 shares of Common
Stock, $.001 par value. At March 14, 1996, there were 35,389,961 shares of
Common Stock outstanding. Holders of Common Stock are entitled to one vote at
all meetings of shareholders for each share held by them. Common Stock have no
preemptive rights and have no other rights to subscribe for additional shares or
any conversion right or right of redemption. Holders of Common Stock are
entitled to receive such dividends as may be declared by the Board of Directors
out of funds legally available therefor. Subject to the rights of holders of
Preferred Stock, if any, upon liquidation, all such holders are entitled to
participate pro rata in the assets of the Company available for distribution.
All of the outstanding shares of Common Stock are, and the shares to be issued
hereby will be, when issued, fully paid and nonassessable.

CLASS B WARRANTS

         The Class B Warrants were issued pursuant to a warrant agreement (the
"Warrant Agreement") among the Company, Blair and American Stock Transfer &
Trust Company, the warrant agent and, with respect to the Class B Warrants
offered hereby, Unit Purchase Options issued to Blair's designees in connection
with the Company's initial public offering.

         At March 14, 1996, the Company had 1,855,557 Class B Warrants
outstanding including the Class B Warrants offered hereby. Each Class B Warrant
entitles the registered holder thereof to purchase one share of Common Stock at
a price of $4.75 subject to adjustment, at any time after the date of issuance
until the close of business on March 15, 1996, subject to earlier redemption as
follows: If the average of the closing prices of the Common Stock exceeds $5.50
for any period of 20 consecutive business days, then upon at least 30 days'
prior written notice, given within 15 days, the Company will be able to call all
(but not less than all) of the Class B Warrants for redemption at a price of
$.05 per Class B Warrant. The Class B Warrants underlying the Unit Purchase
Options (including the Class A Warrants) are not subject to redemption.

         The exercise prices of the Class B Warrants were determined by
negotiation between the Company and Blair. The exercise price of the Class B
Warrants and the number and kind of shares of Common Stock or other securities
and property to be obtained upon exercise of the Class B Warrants are subject to
adjustment in certain circumstances.

         The Class B Warrants do not confer upon the holder any voting or any
other rights of a shareholder of the Company. Upon notice to the Class B
Warrantholders, the Company has the right to reduce the exercise price or extend
the expiration date of the Class B Warrants. Although this right is intended to
benefit Class B Warrantholders to the extent the Company exercises this right
when the Class B Warrants would otherwise be exercisable at a price higher than
the prevailing market price of the Common Stock, the likelihood of exercise, and


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                                      -25-

<PAGE>

resultant increase in the number of shares outstanding, may result in making
more costly or impeding a change in control in the Company.

         The Class B Warrants may be exercised upon surrender of the Class B
Warrant certificate on or prior to the respective expiration date (or earlier
redemption date) of such Class B Warrants at the offices of American Stock
Transfer & Trust Company (the "Warrant Agent"), with the form of "Election to
Purchase" on the reverse side of the Class B Warrant certificate completed and
executed as indicated, accompanied by payment of the full exercise price (by
certified check payable to the order of the Class B Warrant Agent) for the
number of Class B Warrants being exercised.

TRANSFER AGENT AND WARRANT AGENT

         American Stock Transfer & Trust Company, 40 Wall Street, New York, New
York, 10005 serves as transfer and warrant agent for the Common Stock and Class
B Warrants.

PREFERRED STOCK

         The Certificate of Incorporation of the Company authorizes the issuance
of 5,000,000 shares of Preferred Stock. The Board of Directors, within the
limitations and restrictions contained in the Certificate of Incorporation and
without further action by the Company's stockholders, has the authority to issue
Preferred Stock from time to time in one or more series and to fix the number of
shares and the relative rights, conversion rights, voting rights, rights and
terms of redemption, liquidation preferences and any other preferences, special
rights and qualifications of any such series. To the extent shares of Preferred
Stock with voting rights are issued, such issuance affects the voting rights of
the holders of the Company's Common Stock by increasing the number of
outstanding shares entitled to vote and, if applicable, by the creation of class
or series voting rights. In addition, while the issuance of Preferred Stock can
provide flexibility in connection with acquisitions and other corporate
purposes, any issuance of Preferred Stock could, under certain circumstances,
have the effect of delaying or preventing a change in control of the Company and
may adversely affect the rights of holders of Common Stock. Other than the
Series B and Series C Preferred Stock issued and additional shares of preferred
stock which may be issued to AHP, the Company has no agreements or arrangements
to issue any shares of Preferred Stock or to establish or designate any series
of Preferred Stock.

         In November 1992, the Company sold 239,425 shares of Series B Preferred
Stock to AHP pursuant to the Sublicense Agreements for an aggregate purchase
price of $3,000,000. In June 1993, the Company sold 5,000 shares of Series C
Preferred Stock to AHP for an aggregate purchase price of $500,000. Holders of
the Series B and Series C Preferred Stock are entitled to vote on all matters
submitted to a vote of stockholders generally, other than the election of
directors, holding the number of votes equal to the number of shares of Common
Stock into which the Preferred Stock is then convertible. The shares of Series B
Preferred Stock and the Series C Preferred Stock are convertible into an
aggregate of 622,221 shares of Common Stock, subject to further adjustment.
Holders of the Series B and Series C Preferred Stock are entitled to receive out
of funds legally available therefor, mandatory dividends of $.1253 and $1.00 per


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                                      -26-

<PAGE>

share, respectively, payable at the election of the Company in cash or Common
Stock. Such dividends are payable annually on April 1 of each year, accrue on a
daily basis and are cumulative. In the event of any liquidation, distribution or
sale of all or substantially all of the assets, dissolution or winding up of the
Company, the holders of Series B and Series C Preferred Stock shall be entitled
to receive a preference of $12.53 and $100 per share, respectively, plus
cumulated and unpaid dividends, over the holders of Common Shares and any other
shares, other than any other series of Preferred Stock which may be issued to
AHP under the Agreement which rank on a parity with the Series B and C Preferred
Stock.

         The Equity Agreement provides for the potential sale to AHP of up to
$3,500,000 (35,000 shares) of Series D or E Preferred Stock ( the "Additional
Series"), depending upon whether and when specified milestones are achieved.
Each of the Additional Series will contain terms substantially similar to those
of the Series C Preferred Stock except that each share of any Additional Series
will be convertible into the number of shares of Common Stock obtained by
dividing $100 by the then conversion price. The initial conversion price for the
Series D and Series E Preferred Stock will be 150% of the market price of the
Common Stock for 10 days preceding the effectiveness of the NDA or descheduling
of dexfenfluramine, respectively, subject to the antidilution adjustments.
Holders of the Additional Series are entitled to dividends of $1.00 per share
and a liquidation preference of $100 per share on the terms described above.

         Until the date AHP ceases to be the registered holder of all of the
outstanding Preferred Stock of at least one series, the Company will not,
without the approval of the majority of the outstanding shares of all series of
Preferred Stock issued to AHP, (i) issue shares of stock having a preference or,
except shares issued to AHP, ranking pari passu with the outstanding series;
(ii) reclassify any shares of stock to shares having a preference over any such
series; (iii) make any amendment to its Certificate of Incorporation or by-laws
adversely affecting the rights of holders of such series; (iv) merge or
consolidate with any entity or sell or otherwise dispose of all or substantially
all of its assets or liquidate, dissolve, recapitalize or reorganize; (v)
repurchase or redeem any shares of its Common Stock; (vi) pay dividends or make
any other distribution on any Common Stock, except a distribution payable
entirely in Common Stock, unless at the same time, a payment is made to the
holder of such series equal to the amount the holder would have been entitled to
had such holder converted its Series B and Series C Preferred Stock into Common
Stock; or (vii) guarantee any indebtedness of any third party, except a
subsidiary.

BUSINESS COMBINATION PROVISIONS

         The Business Combination provision contained in Section 203 of
Delaware's General Corporation Law ("Section 203") defines an interested
shareholder as any person that (i) owns, directly or indirectly 15% or more of
the outstanding voting stock of the corporation or (ii) is an affiliate or
associate of the corporation and was the owner of 15% or more of the outstanding
voting stock at any time within the three-year period immediately prior to the
date on which it is sought to be determined whether such person is an interested
shareholder; and the affiliates and the associates of such person. Under Section
203, a resident domestic corporation may not engage in any business combination
with any interested shareholder for a period of three years following the date
such shareholder became an interested shareholder, unless (i) prior to such date

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                                      -27-

<PAGE>

the board of directors of the corporation approved either the business
combination or the transaction which resulted in the shareholder becoming an
interested shareholder or (ii) upon consummation of the transaction which
resulted in the shareholder becoming an interested shareholder, the interested
shareholder owned at least 85% of the voting stock of the corporation
outstanding at the time the transaction commenced (excluding for determining the
number of shares outstanding (a) shares owned by persons who are directors and
officers and (b) employee stock plans, in certain instances, or (iii) on or
subsequent to such date the business combination is approved by the board of
directors and authorized at an annual or special meeting of shareholders by at
least 66% of the affirmative voting stock which is not owned by the interested
shareholder. The Company did not "elect-out" of the statute and, therefore, the
restrictions imposed by Section 203 apply to the Company.

REGISTRATION RIGHTS

         Substantially all of the Shares offered hereby had certain demand and
piggy-back registration rights. In addition to these registration rights, one
stockholder of the Company has demand and piggy-back registration rights
relating to a minimum of 1,000,000 shares of Common Stock commencing in June
1996, one stockholder of the Company has demand and piggy-back registration
rights, which have been waived in connection with this offering, relating to
622,221 shares of Common Stock, holders of shares of Common Stock to be issued
in each of November 1996 and 1997 with a market value of $1,200,000 at the time
of each issuance have registration rights in January 1997 and 1998 relating to
the resale of those shares and, in the event up to a maximum of 2,181,638 shares
of Common Stock are issued in June 1998 pursuant to Put Protection Rights issued
in connection with certain financings of Subsidiaries, holders of such shares
will have registration rights at that time.

SHARES ELIGIBLE FOR FUTURE SALE

         At March 14, 1996, the Company had 35,362,961 shares of Common Stock
outstanding. Of these shares, and excluding the shares offered hereby,
approximately 17,000,000 are owned by affiliates of the Company or are
"restricted securities" within the meaning of Rule and are or will be eligible
for sale under Rule 144.

         In general under Rule 144 as currently in effect, a person (or persons
whose shares are aggregated), including persons who may be deemed to be
"affiliates" of the Company as that term is defined under the Act, is entitled
to sell within any three-month period a number of restricted shares beneficially
owned for at least two years that does not exceed the greater of (i) one percent
of the then outstanding shares of Common Stock, or (ii) the average weekly
trading volume in the Common Stock during the four calendar weeks preceding such
sale. Sales under Rule 144 are also subject to certain requirements as to the
manner of sale, notice and the availability of current public information about
the Company. However, a person who is not an affiliate and has beneficially
owned such shares for at least three years is entitled to sell such shares
without regard to the volume of other resale requirements.

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                                      -28-

<PAGE>

         The Company also has registration statements on Form S-8 relating to
its Stock Option Plans and Stock Purchase Plan in order to permit holders of
options issued pursuant to the Plans, other than affiliates of the Company, to
sell, without restriction, shares of Common Stock issued upon exercise of
options.

                                  LEGAL MATTERS

         The validity of the securities offered hereby have been passed upon for
the Company by Bachner, Tally, Polevoy & Misher LLP, New York, New York. Certain
members of Bachner, Tally, Polevoy & Misher LLP, including the secretary of the
Company, own approximately 19,000 shares of Common Stock of the Company.


                                     EXPERTS

         The consolidated balance sheets as of September 30, 1995 and 1994 and
the consolidated statements of operations, cash flows and stockholders' equity
for each of the three years in the period ended September 30, 1995, incorporated
by reference in this registration statement, have been incorporated herein in
reliance on the report of Coopers & Lybrand L.L.P. independent accountants,
given on the authority of that firm as experts in accounting and auditing.


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                                      -29-

<PAGE>

         No dealer, salesman or any other person has been authorized to give any
information or to make any representation not contained in this Prospectus in
connection with the Offering herein contained, and, if given or made, such
information or representation must not be relied upon as having been authorized
by the Company or any underwriter. This Prospectus does not constitute an offer
to sell or a solicitation of any offer to buy any of the securities offered
hereby in any jurisdiction to any person to whom it is unlawful to make such an
offer or solicitation in such jurisdiction. Neither the delivery of this
Prospectus nor any sale hereunder shall under any circumstances create any
implication that there has been no change in the affairs of the Company since
any of the dates as of which information is furnished herein or since the date
hereof.



                                TABLE OF CONTENTS

                                                                    PAGE

Available Information................................................2
Incorporation of Certain Documents by Reference......................2
Prospectus Summary...................................................4
Risk Factors.........................................................7
Use of Proceeds.....................................................16
Selling Securityholders.............................................17
Plan of Distribution................................................24
Description of Securities...........................................25
Legal Matters.......................................................29
Experts.............................................................29




H:\DOCS\BTPM_NY_\46\0043541.02


<PAGE>



                                     PART II

                     Information Not Required in Prospectus


Item 14.                   OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

                 The estimated expenses payable by the Registrant in connection
with the issuance and distribution of the securities being registered are as
follows:

           SEC Registration Fee.................................. $36,095.21
           Accounting Fees and Expenses..........................   5,000.00
           Legal Fees and Expenses...............................  45,000.00
           Miscellaneous Expenses................................   5,000.00
                Total............................................ $91,095.21
                                    =========

Item 15.                   INDEMNIFICATION OF DIRECTORS AND OFFICERS.

                  The Certificate of Incorporation and By-Laws of the Company
provide that the Company shall indemnify any person to the full extent permitted
by the Delaware General Corporation Law.

                  Reference is hereby made to Section 145 of the Delaware
General Corporation Law relating to the indemnification of officers and
directors which Section is hereby incorporated herein by reference.

                  The Registrant also has Indemnification Agreements with each
of its directors.

Item 16.                   EXHIBITS.

(a)      EXHIBITS

         4.2         -     Form of Warrant Agreement (1)
         4.4         -     Certificate of Designation establishing Series C
                               Preferred Stock (17)
         4.6         -     Form of Registrant Warrant issued in subsidiary
                               private placement (25)
         4.7         -     Form of Registrant Warrant issued to designees
                               of Paramount Capital, Inc.
                           and D.H. Blair & Co., Inc. (25)
         5.1         -     Opinion of Bachner, Tally, Polevoy & Misher LLP 
                              as to legality
         10.68(a)    -     1995 Employee Stock Purchase Plan, as amended
         23.1        -     Consent of Coopers & Lybrand L.L.P. - Included 
                              on II - 6*
         23.2        -     Consent of Bachner, Tally, Polevoy & Misher LLP 
                              - Included in Exhibit 5.1
         24          -     Power of Attorney - Included on II - 4*

- --------
         *           Previously filed

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                                      II-1

<PAGE>


(1)      Incorporated by reference to the Registrant's registration statement
          on Form S-1 (File No.
         33-32408) declared effective on March 8, 1990.
(17)     Incorporated by reference to the Registrant's Quarterly Report on
           Form 10-Q for the nine
         months ended June 30, 1993
(25)     Incorporated by reference to the Registrant's Annual Report 
           on Form 10-K for the fiscal year ended September 30, 1994

Item 17.             UNDERTAKINGS

Undertaking Required by Regulation S-K, Item 512(a).

         The undersigned registrant hereby undertakes:

                  (1) To file, during any period in which offers or sales are
         being made, a post-effective amendment to this registration statement
         to include any material information with respect to the plan of
         distribution not previously disclosed in the registration statement or
         any material change to such information in the registration statement;

                  (2) That, for the purpose of determining any liability under
         the Securities Act of 1933, each such post-effective amendment shall be
         deemed to be a new registration statement relating to the securities
         offered therein, and the offering therein, and the offering of such
         securities at that time shall be deemed to be the initial bona fide
         offering thereof.

                  (3) To remove from registration by means of a post-effective
         amendment any of the securities being registered which remain unsold at
         the termination of the offering.

Undertaking Required by Regulation S-K, Item 512(b).

         The undersigned registrant hereby undertakes that, for purposes of
         determining any liability under the Securities Act of 1933, each filing
         of the registrant's annual report pursuant to Section 13(a) or 15(d) of
         the Securities Exchange Act of 1934 that is incorporated by reference
         in the registration statement shall be deemed to be a new registration
         statement relating to the securities offered therein, and the offering
         of such securities at that time shall be deemed to be initial bona fide
         offering thereof.

Undertaking required by Regulation S-K, Item 512(h).

         Insofar as indemnification for liabilities arising under the Securities
         Act of 1933 may be permitted to directors, officers or controlling
         persons pursuant to the foregoing provisions, or otherwise, the
         registrant 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 registrant of expenses incurred or paid by a
         director, officer or controlling person of the registrant in the
        

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                                      II-2

<PAGE>


         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 Act
         and will be governed by the final adjudication of such issue.

Undertakings required by Regulation S-K, Item 512(i).

         The undersigned registrant hereby undertakes that:

         (1) For purposes of determining any liability under the Securities Act
         of 1933, as amended, the information omitted from the form of
         prospectus filed as part of this Registration Statement in reliance
         upon Rule 430A and contained in the form of prospectus filed by the
         Registrant 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 purposes of determining any liability under the Securities Act
         of 1933, each post-effective amendment that contains a form of
         prospectus shall be deemed to be a new registration statement relating
         to the securities offered therein, and the offering of such securities
         at that time shall be deemed to be the initial bona fide offering
         thereof.


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                                      II-3

<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 Form S-3 and has duly caused this Amendment
to this Registration Statement to be signed on its behalf by the undersigned,
thereunto duly authorized, in the City of Lexington, County of Middlesex on the
15th day of March, 1996.

                                      INTERNEURON PHARMACEUTICALS, INC.

                                      By:/S/  GLENN L. COOPER, M.D.
                                         -------------------------------   
                                              Glenn L. Cooper, M.D.
                                         President and Chief Executive Officer


                  Pursuant to the requirements of the Securities Act of 1933,
this Registration Statement or amendment thereto has been signed by the
following persons in the capacities and on the dates indicated.

         SIGNATURE               TITLE                          DATE

/S/ GLENN L. COOPER, M.D.        President, Chief Executive
 --------------------------          Officer and Director
    Glenn L. Cooper, M.D.        (Principal Executive Officer)  March 15, 1996
*
- --------------------------
   Lindsay Rosenwald, M.D.       Chairman of the Board of
                                 Directors                      March 15, 1996
- ---------------------------
  Harry J. Gray                  Director                       March __, 1996

- ---------------------------
  Alexander M. Haig, Jr.         Director                       March __, 1996
*
- --------------------------
  Peter Barton Hutt              Director                       March 15, 1996
*
- --------------------------
  Malcolm Morville, Ph.D.        Director                       March 15, 1996
*
- --------------------------
  Robert K. Mueller              Director                       March 15, 1996
*
- --------------------------
  Lee J. Schroeder               Director                       March 15, 1996

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                                      II-4

<PAGE>

*
- --------------------------
  David Sharrock                   Director                     March 15, 1996

*
- --------------------------
  Richard Wurtman, M.D.            Director                     March 15, 1996

*
- --------------------------
  Thomas F. Farb                   Executive Vice President,
                                    Finance, Treasurer and 
                                    Chief Financial Officer
                                    (Principal Financial and
                                    Accounting Officer)           March 15, 1996

*/S/   GLENN L. COOPER, M.D.
By:  Glenn L. Cooper, M.D.,
        As attorney in fact                                       March 15, 1996





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                                                                   Exhibit 23.2

                       CONSENT OF INDEPENDENT ACCOUNTANTS

                  We consent to the incorporation by reference in this
registration statement on Form S-3 of our report dated November 13, 1995, on our
audits of the consolidated financial statements of Interneuron Pharmaceuticals,
Inc. as of September 30, 1994 and 1995, and for each of the three years in the
period ended September 30, 1995, which report is included in the Annual Report
on Form 10-K of Interneuron Pharmaceuticals, Inc. for the fiscal year ended
September 30, 1995. We also consent to the references to our firm under the
caption "Experts".


                                                     COOPERS & LYBRAND L.L.P.

Boston, Massachusetts
February 28, 1996


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                                                                  EXHIBIT INDEX

         4.2         -     Form of Warrant Agreement (1)
         4.4         -     Certificate of Designation establishing Series C
                              Preferred Stock (17)
         4.6         -     Form of Registrant Warrant issued in subsidiary 
                              private placement (25)
         4.7         -     Form of Registrant Warrant issued to designees
                              of Paramount Capital, Inc. and D.H. Blair &
                              Co., Inc. (25)
         5.1         -     Opinion of Bachner, Tally, Polevoy & Misher LLP 
                              as to legality
         10.68(a)    -     1995 Employee Stock Purchase Plan, as amended
         23.1        -     Consent of Coopers & Lybrand L.L.P. 
                              - Included on II - 6*
         23.2        -     Consent of Bachner, Tally, Polevoy & Misher LLP
                              - Included in Exhibit 5.1
         24          -     Power of Attorney - Included on II - 4*

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

(1)      Incorporated by reference to the Registrant's registration statement
           on Form S-1 (File No. 33-32408) declared effective on March 8, 1990.
(17)     Incorporated by reference to the Registrant's Quarterly Report on 
           Form 10-Q for the nine months ended June 30, 1993
(25)     Incorporated by reference to the Registrant's Annual Report on
           Form 10-K for the fiscal year ended September 30, 1994



- ----------------
         *           Previously filed

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                                  EXHIBIT 5.1


                                 March 15, 1996

Interneuron Pharmaceuticals, Inc.
1 Ledgemont Center
99 Hayden Avenue
Suite 340
Lexington, MA 02173

Gentlemen:

         You have requested our opinion with respect to the offering and sale by
certain stockholders of the Company (the "Selling Stockholders") of an aggregate
of 3,533,078 shares, including 410,179 shares issuable upon exercise of warrants
(the "Shares") of Common Stock, par value $.001 per share (the "Common Stock"),
of Interneuron Pharmaceuticals, Inc., a Delaware corporation (the "Company"),
pursuant to a Registration Statement on Form S-3 (No. 333-1273) (the
"Registration Statement") under the Securities Act of 1933, as amended (the
"Act").

         We have examined originals, or copies certified or otherwise identified
to our satisfaction, of such documents ad corporate and public records as we
deem necessary as a basis for the opinion hereinafter expressed. With respect to
such, we have assumed the genuineness of all signatures appearing on all
documents presented to us as originals, and the conformity to the originals of
all documents presented to us as conformed or reproduced copies. Where factual
matters relevant to such opinion were not independently established, we have
relied upon certificates of officers and responsible employees and agents of the
Company.

         Based upon the foregoing, it is our opinion that the Shares have been
duly and validly authorized and when sold, paid for and issued as contemplated
by the Registration Statement will be duly and validly issued and fully paid an
nonassessable.

         We hereby consent to the use of this opinion as Exhibit 5.1 to the
Registration Statement, and to the use of our name as counsel to the Company in
connection with the Registration Statement and in the Prospectus forming a part
thereof. In giving this consent, we do not thereby concede that we come within
the categories of persons whose consent is required by the Act or the General
Rules and Regulations promulgated thereunder.

                                     Very truly yours,



                                     BACHNER, TALLY, POLEVOY & MISHER LLP
JMC:brf


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                        INTERNEURON PHARMACEUTICALS, INC.

                  1995 EMPLOYEE STOCK PURCHASE PLAN, AS AMENDED


               1. PURPOSE. The Interneuron  Pharmaceuticals,  Inc. 1995 Employee
Stock Purchase Plan (the "Plan") is established to provide eligible employees of
Interneuron  Pharmaceuticals  Inc., a Delaware  corporation,  and any  successor
corporation  thereto  (collectively,  "Interneuron"),  and any current or future
parent  corporation  or subsidiary  corporations  of Interneuron as the Board of
Directors  of  Interneuron  (the  "Board")  shall  from  time to time  designate
(collectively  referred to as the  "Company" and  individually  referred to as a
"Participating  Company"), with an opportunity to acquire a proprietary interest
in the Company by the purchase of common stock of  Interneuron.  For purposes of
the Plan, a parent corporation and a subsidiary  corporation shall be as defined
in sections  424(e) and 424(f),  respectively,  of the Internal  Revenue Code of
1986, as amended (the "Code").

               Interneuron  intends that the Plan shall  qualify as an "employee
stock purchase plan" under section 423 of the Code  (including any amendments or
replacements of such section), and the Plan shall be so construed.  Any term not
expressly  defined in the Plan but  defined  for  purposes of section 423 of the
Code shall have the same definition herein.

               An  employee  participating  in the  Plan (a  "Participant")  may
withdraw  such  Participant's   accumulated  payroll  deductions  (if  any)  and
terminate  participation  in the Plan or any Offering (as defined below) therein
at any time  during a Purchase  Period (as  defined  below).  Accordingly,  each
Participant  is, in effect,  granted an option pursuant to the Plan (a "Purchase
Right") which may or may not be exercised at the end of a Purchase Period.

               2.  ADMINISTRATION.  The Plan shall be  administered by the Board
and/or by a duly appointed committee of the Board having such powers as shall be
specified by the Board.  Any subsequent  references to the Board shall also mean
the committee if a committee has been appointed. All questions of interpretation
of the Plan or of any Purchase  Right shall be determined by the Board and shall
be final and binding upon all persons  having an interest in the Plan and/or any
Purchase Right. Subject to the provisions of the Plan, the Board shall determine
all of the relevant terms and conditions of Purchase Rights granted  pursuant to
the Plan;  provided,  however,  that all  Participants  granted  Purchase Rights
pursuant  to the Plan  shall  have the same  rights  and  privileges  within the
meaning of section  423(b)(5) of the Code.  All expenses  incurred in connection
with the administration of the Plan shall be paid by the Company.

               3.  SHARE  RESERVE.  The  maximum  number of shares  which may be
issued  under  the Plan  shall  be One  Hundred  Thousand  (100,000)  shares  of
Interneuron's  authorized  but  unissued  common  stock,  $.001 par  value  (the
"Shares"). In the event that any Purchase Right for
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any reason expires or is canceled or terminated, the Shares allocable to the
unexercised portion of such Purchase Right may again be subjected to a Purchase
Right.

               4.  ELIGIBILITY.  Any  employee  of a  Participating  Company  is
eligible to participate in the Plan except employees who:

               (a) customarily work less than 20 hours per week;

               (b)  customarily  work not more than five months in any  calendar
year; or

               (c) as of the start of an Offering,  own stock of Interneuron (or
any parent or subsidiary corporations) and/or own or hold options to purchase or
who,  as a result of  participation  in the Plan,  would own or hold  options to
purchase,  stock of  Interneuron  (or any  parent or  subsidiary  corporations),
possessing five percent (5%) or more of the total combined voting power or value
of  all  classes  of  stock  of   Interneuron   (or  any  parent  or  subsidiary
corporations) within the meaning of section 423(b)(3) of the Code.

               Notwithstanding  anything herein  contained to the contrary,  any
individual  performing  services for a  Participating  Company  solely through a
leasing  agency or  employment  agency shall not be deemed an "employee" of such
Participating Company.

               5. OFFERING DATES.

               (a) OFFERING  PERIODS.  Except as otherwise set forth below,  the
Plan  shall  be  implemented  by  offerings  (individually,  an  "offering")  of
approximately  twelve (12) months duration (an "Offering Period").  The "Initial
Offering  Date" is April 1, 1995.  The Initial  Offering shall be of twelve (12)
months  duration,  shall commence on the Initial  Offering Date and shall end on
March 31, 1996 (the  "Initial  Offering  Period").  Subsequent  Offerings  shall
commence on April 1 of each year and end on the March 31  occurring  thereafter.
Notwithstanding the foregoing,  the Board may establish a different term for one
or more  Offerings  and/or  different  commencing  and/or  ending dates for such
Offerings.  An employee who becomes eligible to participate in the Plan after an
Offering  Period has  commenced  shall not be  eligible to  participate  in such
Offering but may participate in any subsequent  Offering  provided such employee
is still eligible to participate in the Plan as of the  commencement of any such
subsequent  Offering.  Eligible  employees may not  participate in more than one
Offering at a time.  The first day of an Offering  Period shall be the "Offering
Date" for such  Offering  Period.  In the event the first  and/or last day of an
Offering  Period is not a business day,  Interneuron  shall specify the business
day that  will be  deemed  the  first or last  day,  as the case may be,  of the
Offering Period.

               (b) PURCHASE PERIODS.  Each Offering Period, shall consist of two
(2) consecutive  purchase  periods of six (6) months duration  (individually,  a
"Purchase Period").

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The last day of each Purchase Period shall be the "Purchase Date" for such
Purchase Period. The Purchase Period commencing on the Initial Offering Date of
April 1, 1995 shall end on September 30, 1995. Each Purchase Period commencing
on October 1 shall end on the next March 31 and each Purchase Period commencing
on April 1 shall end on the next September 30. Notwithstanding the foregoing,
the Board may establish a different term for one or more Purchase Periods and/or
different commencing dates and/or Purchase Dates for such Purchase Periods. In
the event the first and/or last day of a Purchase Period is not a business day,
Interneuron shall specify the business day that will be deemed the first or last
day, as the case may be, of the Purchase Period.

               (c) GOVERNMENTAL APPROVAL; STOCKHOLDER APPROVAL.  Notwithstanding
any other  provision of the Plan to the  contrary,  any Purchase  Right  granted
pursuant  to  the  Plan  shall  be  subject  to  (i)   obtaining  all  necessary
governmental  approvals and/or qualifications of the sale and/or issuance of the
Purchase Rights and/or the Shares,  and (ii) obtaining  stockholder  approval of
the Plan.  Notwithstanding  the  foregoing,  stockholder  approval  shall not be
necessary in order to grant any  Purchase  Right  granted in the Plan's  Initial
Offering Period; provided, however, that the exercise of any such Purchase Right
shall be subject to obtaining stockholder approval of the Plan.

                  6.       PARTICIPATION IN THE PLAN.

               (a) INITIAL  PARTICIPATION.  An eligible  employee shall become a
Participant  on  the  first  Offering  Date  after  satisfying  the  eligibility
requirements  and delivering to the Company's  payroll office not later than the
close of business for such payroll  office on the last  business day before such
Offering Date (the "Subscription Date") a subscription  agreement indicating the
employee's   election  to  participate  in  the  Plan  and  authorizing  payroll
deductions.  An eligible employee who does not deliver a subscription  agreement
to the Company's  payroll  office on or before the  Subscription  Date shall not
participate in the Plan for that Offering Period or for any subsequent  Offering
Period  unless  such  employee  subsequently  enrolls  in the  Plan by  filing a
subscription  agreement  with  the  Company  by the  Subscription  Date for such
subsequent  Offering  Period.  The Company  may,  from time to time,  change the
Subscription  Date as deemed advisable by the Company in its sole discretion for
proper administration of the Plan.

               (b) CONTINUED  PARTICIPATION.  A Participant shall  automatically
participate  in the  Offering  Period  commencing  immediately  after  the final
Purchase  Date of each  Offering  Period in which the  Participant  participates
until such time as such  Participant  (i) ceases to be  eligible  as provided in
paragraph 4, (ii) withdraws  from the Plan pursuant to paragraph  11(b) or (iii)
terminates  employment  as  provided  in  paragraph  12.  If  a  Participant  is
automatically withdrawn from an Offering at the end of a Purchase Period of such
Offering pursuant to paragraph 11(d),  then the Participant shall  automatically
participate  in the next Offering  Period.  If a Participant  automatically  may
participate in a subsequent  Offering  Period  pursuant to this paragraph  6(b),
then  the  Participant  is not  required  to file  any  additional  subscription
agreement for such subsequent Offering Period in order to continue participation

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<PAGE>

in the Plan.  However,  a Participant  may file a  subscription  agreement  with
respect to a subsequent Offering Period if the Participant desires to change any
of the Participant's  elections  contained in the  Participant's  then effective
subscription agreement.

               7. RIGHT TO PURCHASE SHARES. Except as set forth below, during an
Offering  Period each  Participant in such Offering Period shall have a Purchase
Right consisting of the right to purchase the lesser of:

               (a) that  number of whole  Shares  arrived at by  dividing  Fifty
Thousand Dollars  ($50,000.00) by the fair market value of a share of the common
stock of Interneuron on the Offering Date of such Offering Period; and

               (b) 3,000 Shares.

               The fair market value of Shares shall be determined in accordance
with  paragraph 8 below.  Shares may only be purchased  through a  Participant's
payroll  withholding  pursuant  to  paragraph  9  below.  In no  event  shall  a
Participant's  Purchase Right permit such  Participant to acquire more shares in
any calendar year than is permitted under Section 10(a) hereof.

               8.  PURCHASE  PRICE.  The  purchase  price at which Shares may be
acquired  in a given  Purchase  Period  pursuant  to the  exercise of all or any
portion of a  Purchase  Right  granted  under the Plan (the  "Offering  Exercise
Price") shall be set by the Board; provided, however, that the Offering Exercise
Price shall not be less than eighty-five  percent (85%) of the lesser of (i) the
fair market value of the Shares on the Offering  Date of the Offering  Period of
which the Purchase Period is a part, or (ii) the fair market value of the Shares
on the Purchase Date for such Purchase Period.  Unless otherwise provided by the
Board prior to the  commencement of an Offering  Period,  the Offering  Exercise
Price for each  Purchase  Period in that  Offering  Period shall be  eighty-five
percent  (85%) of the lesser of (i) the fair  market  value of the Shares on the
Offering  Date of such  Offering  Period  or (ii) the fair  market  value of the
Shares on the given  Purchase  Date.  The fair market value of the Shares on the
applicable  dates shall be the closing sales price on the Nasdaq National Market
(or the average of the closing bid and asked  prices if the Shares are so quoted
instead) or as reported on such other national or regional  securities  exchange
or market  system if the  Shares are  traded on such  other  exchange  or system
instead, or as determined by the Board if the Shares are not so reported. If the
relevant date does not fall on a day on which the common stock of Interneuron is
quoted  on the  Nasdaq  National  Market  or such  other  national  or  regional
securities exchange or market, the date on which the fair market value per Share
shall  be  established  shall  be the last  day on  which  the  common  stock of
Interneuron was so quoted to such relevant date.

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<PAGE>

               9. PAYMENT OF PURCHASE PRICE.  Shares which are acquired pursuant
to the  exercise of all or any portion of a Purchase  Right may be paid for only
by means of payroll  deductions from the Participant's  Compensation  during the
Offering Period. For purposes of the Plan, a Participant's  "Compensation"  with
respect to an Offering (i) shall  include the  Participant's  base salary before
deduction  for any  contributions  to any  plan  maintained  by a  Participating
Company and described in section 401(k) or section 125 of the Code, commissions,
overtime and bonuses and (ii) shall not include annual awards,  other  incentive
payments,  shift premiums,  long-term  disability,  worker's compensation or any
other payments not  specifically  referenced in (i).  Except as set forth below,
the amount of  Compensation  to be withheld  from a  Participant's  Compensation
during each pay period shall be  determined  by the  Participant's  subscription
agreement.

               (a) ELECTION TO DECREASE,INCREASE OR STOP WITHHOLDING.  During an
Offering  Period,  a Participant may elect to decrease the amount  withheld,  or
stop withholding, from his or her Compensation by filing as amended subscription
agreement  with the Company on or before the "Change  Notice  Date." The "Change
Notice Date" shall  initially  be the seventh  (7th) day prior to the end of the
first pay  period for which  such  election  is to be  effective;  however,  the
Company  may change such Change  Notice  Date from time to time.  A  Participant
mayelect to increase the amount  withheld  from the  Participant's  Compensation
once during a Purchase Period.

               (b)  LIMITATIONS  ON PAYROLL  WITHHOLDING.  The amount of payroll
withholding  with respect to the Plan for any Participant  during any pay period
shall be in one percent (1%)  increments  not to exceed ten percent (10%) of the
Participant's  Compensation for such pay period.  Notwithstanding the foregoing,
the Board may change the limits on payroll withholding  effective as of a future
Offering Date, as determined by the Board.  Amounts withheld shall be reduced by
any  amounts  contributed  by the  Participant  and  applied to the  purchase of
Company stock  pursuant to any other  employee  stock  purchase plan  qualifying
under section 423 of the Code.

               (c) PAYROLL WITHHOLDING. Payroll deductions shall commence on the
first payday  following the Offering  Date and shall  continue to the end of the
Offering Period unless sooner altered or terminated as provided in the Plan.

               (d) PARTICIPANT ACCOUNTS. Individual accounts shall be maintained
for each Participant.  All payroll deductions from a Participant's  Compensation
shall be credited to such account and shall be deposited  with the general funds
of the Company.  All payroll  deductions  received or held by the Company may be
used by the Company for any corporate purpose.

               (e) NO INTEREST PAID. Interest shall not be paid on sums withheld
from a Participant's Compensation, unless the Board elects to make such payments
to all Participants on a non-discriminatory basis.

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<PAGE>

               (f)  EXERCISE  OF PURCHASE  RIGHT.  On each  Purchase  Date of an
Offering  Period,  each  Participant  who has not withdrawn from the Offering or
whose  participation  in the  Offering  has not  terminated  on or  before  such
Purchase  Date shall  automatically  acquire  pursuant  to the  exercise  of the
Participant's  Purchase  Right the number of whole Shares arrived at by dividing
the total amount of the  Participant's  accumulated  payroll  deductions for the
Purchase Period by the Offering Exercise Price;  provided,  however, in no event
shall the number of Shares  purchased  by the  Participant  exceed the number of
Shares subject to the Participant's Purchase Right or the limitations imposed by
Section 10(a) hereof.  No Shares shall be purchased on a Purchase Date on behalf
of a Participant whose  participation in the Offering or the Plan has terminated
on or before such Purchase Date.

               (g) RETURN OF CASH  BALANCE.  Any cash  balance  remaining in the
Participant's   account  shall  be  refunded  to  the  Participant  as  soon  as
practicable  after the Purchase  Date. In the event the cash to be returned to a
Participant pursuant to the preceding sentence is an amount less than the amount
necessary  to  purchase a whole  Share,  the Company  may  establish  procedures
whereby such cash is maintained in the Participant's  account and applied toward
the purchase of Shares in the subsequent Purchase Period or Offering Period.

               (h) TAX WITHHOLDING. At the time the Purchase Right is exercised,
in whole or in part,  or at the time some or all of the Shares are  disposed of,
the Participant shall make adequate provision for the foreign, federal and state
tax withholding obligations of the Company, if any, which arise upon exercise of
the Purchase Right and/or upon disposition of Shares, respectively.  The Company
may, but shall not be obligated to, withhold from the Participant's Compensation
the amount necessary to meet such withholding obligations.

               (i) COMPANY ESTABLISHED PROCEDURES. The Company may, from time to
time,  establish  or  change  (i) a  minimum  required  withholding  amount  for
participation in an Offering, (ii) limitations on the frequency and/or number of
changes in the amount  withheld  during an  Offering,  (iii) an  exchange  ratio
applicable  to amounts  withheld  in a currency  other than U.S.  dollars,  (iv)
payroll  withholding  in  excess  of or less  than the  amount  designated  by a
Participant  in  order  to  adjust  for  delays  or  mistakes  in the  Company's
processing of subscription  agreements,  (v) the date(s) and manner by which the
fair market value of the Shares is determined for purposes of  administration of
the Plan and/or (vi) such other limitations or procedures as deemed advisable by
the Company in the Company's sole discretion  which are consistent with the Plan
and in accordance with the requirements of section 423 of the Code.

               (j) EXPIRATION OF PURCHASE RIGHT.  Any portion of a Participant's
Purchase Right  remaining  unexercised  after the end of the Offering  Period to
which such Purchase Right relates shall expire  immediately upon the end of such
Offering Period.

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<PAGE>

               10. LIMITATIONS ON PURCHASE OF SHARES; RIGHTS AS A STOCKHOLDER.

               (a) FAIR  MARKET  VALUE  LIMITATION.  Notwithstanding  any  other
provision of the Plan, no Participant shall be entitled to purchase Shares under
the Plan (and under all other  employee  stock purchase plans which are intended
to meet the  requirements of section 423 of the Code sponsored by the Company or
a parent or  subsidiary  corporation  of the  Company)  at a rate which  exceeds
$25,000 in fair market value,  which fair market value is determined  for Shares
purchased  during  a given  Offering  Period  as of the  Offering  Date for such
Offering  Period (or such other  limit as may be imposed by the Code),  for each
calendar year in which such  Participant's  Purchase  Right with respect to such
Offering Period remains outstanding under the Plan (and under all other employee
stock purchase plans described in this sentence).

               (b) PRO RATA ALLOCATION.  In the event the number of Shares which
might be purchased by all  Participants in the Plan exceeds the number of Shares
available  in the Plan,  the  Company  shall make a pro rata  allocation  of the
remaining  Shares  in as  uniform a manner  as shall be  practicable  and as the
Company shall determine to be equitable.

               (c) RIGHTS AS A  STOCKHOLDER  AND EMPLOYEE.  A Participant  shall
have no rights as a stockholder by virtue of the Participant's  participation in
the Plan until the date of the issuance of a stock certificate(s) for the Shares
being purchased pursuant to the exercise of the Participant's Purchase Right. No
adjustment shall be made for cash dividends or distributions or other rights for
which the record date is prior to the date such stock certificate(s) are issued.
Nothing  herein  shall  confer upon a  Participant  any right to continue in the
employ of the Company or  interfere  in any way with any right of the Company to
terminate the Participant's employment at any time.

               11. WITHDRAWAL.

               (a) WITHDRAWAL FROM AN OFFERING.  A Participant may withdraw from
an Offering by signing and delivering to the Company's payroll office, a written
notice of  withdrawal  on form  provide by the  Company for such  purpose.  Such
withdrawal  may be elected at any time prior to the end of an  Offering  Period;
provided,  however,  if a  Participant  withdraws  after the Purchase Date for a
Purchase Period of an Offering,  the withdrawal shall not affect Shares acquired
by  the  Participant  in  such  Purchase  Period.  Unless  otherwise  indicated,
withdrawal  from an Offering  shall not result in a withdrawal  from the Plan or
any succeeding Offering therein. By withdrawing from an Offering effective as of
the close of a given Purchase Date, a Participant  may have Shares  purchased on
such Purchase Date and immediately  commence  participation in the next Offering
commencing  after such  Purchase  Date. A Participant  is prohibited  from again
participating in an Offering at any time upon withdrawal from such Offering. The
Company  may  impose,  from  time to time,  a  requirement  that the  notice  of
withdrawal be on file with the Company's  payroll office for a reasonable period
prior to the effectiveness of the Participant's withdrawal from an Offering.

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<PAGE>

               (b) WITHDRAWAL FROM THE PLAN. A Participant may withdraw from the
Plan by signing a written notice of withdrawal on a form provided by the Company
for such purpose and  delivering  such notice to the Company's  payroll  office.
Withdrawals  made after a Purchase  Date for a Purchase  Period shall not affect
Shares  acquired  by the  Participant  on such  Purchase  Date.  In the  event a
Participant  voluntarily  elects to withdraw from the Plan, the  Participant may
not resume  participation in the Plan during the same Offering  Period,  but may
participate  in any subsequent  Offering under the Plan by again  satisfying the
requirements of paragraphs 4 and 6(a) above.  The Company may impose,  from time
to time,  a  requirement  that the  notice  of  withdrawal  be on file  with the
Company's  payroll office for a reasonable  period prior to the effectiveness of
the Participant's withdrawal from the Plan.

               (c)  RETURN  OF  PAYROLL  DEDUCTIONS.  Upon  withdrawal  from  an
Offering or the Plan pursuant to paragraphs  11(a) or 11(b),  respectively,  the
withdrawn  Participant's  accumulated  payroll  deductions  which  have not been
applied  toward the purchase of Shares shall be returned as soon as  practicable
after the  withdrawal,  without  the payment of any  interest  (unless the Board
decides otherwise pursuant to paragraph 9(e) above), to the Participant, and the
Participant's  interest in the Offering  and/or the Plan, as  applicable,  shall
terminate.  Such accumulated  payroll deductions may not be applied to any other
Offering under the Plan.

               (d)  AUTOMATIC  WITHDRAWAL  FROM AN OFFERING.  If the fair market
value of the  Shares on a Purchase  Date of an  Offering  (other  than the final
Purchase Date of such Offering) is less than the fair market value of the Shares
on  the  Offering  Date  for  such  Offering,   then  every   Participant  shall
automatically  (i) be withdrawn from such Offering at the close of such Purchase
Date and after the  acquisition  of Shares for such Purchase  Period and (ii) be
enrolled in the next Offering  commencing  subsequent to such Purchase Period. A
Participant may elect not to be automatically  withdrawn from an Offering Period
pursuant to this paragraph 11(d) by delivering to the Company not later than the
close of  business  on the last day before the  Purchase  Date a written  notice
indicating such election.

               (e) PARTICIPATION  FOLLOWING WITHDRAWAL.  An employee who is also
an officer or director of the  Company  subject to section 16 of the  Securities
Exchange  Act of 1934,  as  amended  (the  "Exchange  Act") and who is deemed to
"cease  participation"  in the Plan within the meaning of Rule 16b-3 promulgated
under the  Exchange Act as amended  from time to time or any  successor  rule or
regulation  ("Rule  16b-3") as a consequence  of his or her  withdrawal  from an
Offering  pursuant to paragraph 11(a) above or withdrawal from the Plan pursuant
to paragraph  11(b) above shall not again  participate  in the Plan for at least
six months after the date of such withdrawal.

               (f) WAIVER OF  WITHDRAWAL  RIGHT.  The Company may,  from time to
time,  establish  a  procedure  pursuant  to which a  Participant  may elect (an
"Irrevocable  Election"),  at least six (6) months prior to a Purchase  Date, to
have all payroll  deductions  accumulated  in his or her Plan account as of such
Purchase Date applied to purchase Shares under the Plan, and (i) to waive his or
her right to withdraw from the Offering or the Plan and (ii) to waive his or her

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right to increase, decrease, or cease payroll deductions under the Plan from his
or her Compensation during the Purchase Period ending on such Purchase Date.
Such election shall be made in writing on a form provided by the Company for
such purpose and must be delivered to the Company not later than the close of
business on the day preceding the date which is six (6) months before the
Purchase Date for which such election is to first be effective.

               12.  TERMINATION  OF EMPLOYMENT.  Termination of a  Participant's
employment with the Company for any reason, including retirement,  disability or
death or the  failure  of a  Participant  to  remain  an  employee  eligible  to
participate in the Plan, shall terminate the Participant's  participation in the
Plan  immediately.  In  such  event,  the  payroll  deductions  credited  to the
Participant's   account  since  the  last  Purchase  Date  shall,   as  soon  as
practicable, be returned to the Participant or, in the case of the Participant's
death, to the Participant's legal  representative,  and all of the Participant's
right  under  the  Plan  shall  terminate.  Interest  shall  not be paid on sums
returned to a Participant  pursuant to this paragraph 12 unless the Board elects
otherwise  pursuant to paragraph 9(e) above. A Participant  whose  participation
has been so terminated  may again become  eligible to participate in the Plan by
again satisfying the requirements of paragraphs 4 and 6(a) above.

               13. TRANSFER OF CONTROL.  A "Transfer of Control" shall be deemed
to have  occurred  in the event any of the  following  occurs  with  respect  to
Interneuron.

               (a) a merger or  consolidation  in which  Interneuron  is not the
surviving corporation;

               (b) a  merger  or  consolidation  in  which  Interneuron  is  the
surviving  corporation where the stockholders of Interneuron  before such merger
or consolidation do not retain,  directly or indirectly,  at least a majority of
the beneficial interest in the voting stock of Interneuron;

               (c) the sale,  exchange,  or transfer of all or substantially all
of Interneuron's assets other than a sale,  exchange,  or transfer to one (1) or
more subsidiary corporations (as defined in section 1, above) of Interneuron;

               (d) the direct or indirect  sale or exchange by the  stockholders
of Interneuron of all or substantially all of the stock of Interneuron where the
stockholders of Interneuron before such sale or exchange do not retain, directly
or  indirectly,  at least a majority  of the  beneficial  interest in the voting
stock of Interneuron after such sale or exchange; or

               (e) the liquidation or dissolution of Interneuron;

               In the event of a Transfer  of  Control,  the Board,  in its sole
discretion, may arrange with the surviving, continuing, successor, or purchasing
corporation, as the case may be (the "Acquiring Corporation"), for the Acquiring
Corporation to assume Interneuron's rights and obligations under the Plan. 

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All Purchase Rights shall terminate  effective as of the date of the Transfer of
Control to the extent that the  Purchase  Right is neither  exercised  as of the
date of the Transfer of Control nor assumed by the Acquiring Corporation.

               14. CAPITAL CHANGES.  In the event of changes in the common stock
of  Interneuron  due to a stock  split,  reverse  stock split,  stock  dividend,
recapitalization, combination, reclassification, or like change in Interneuron's
capitalization,  or in the event of any merger  (including a merger effected for
the purpose of changing Interneuron's  domicile),  sale or other reorganization,
appropriate  adjustments shall be made by Interneuron in the securities  subject
to purchase  under a Purchase  Right,  the Plan's share  reserve,  the number of
Shares subject to a Purchase Right, and in the purchase price per Share.

               15.  TRANSFERABILITY.  A Purchase Right may not be transferred in
any manner  otherwise than by will or the laws of descent and  distribution  and
shall  be  exercisable  during  the  lifetime  of the  Participant  only  by the
Participant.   Interneuron,   in  its  absolute  discretion,   may  impose  such
restrictions on the  transferability of the Shares purchasable upon the exercise
of a Purchase Right as it deems  appropriate,  and any such restriction shall be
set forth in the respective subscription agreement and may be referred to on the
certificates evidencing such Shares.

               16. REPORTS. Each Participant who exercised all or part of his or
her Purchase Right for a Purchase  Period shall receive,  as soon as practicable
after the Purchase Date of such Purchase Period, a report of such  Participant's
account setting forth the total payroll  deductions  accumulated,  the number of
Shares purchased, the fair market value of such Shares, the date of purchase and
the  remaining  cash  balance to be refunded  or  retained in the  Participant's
account pursuant to paragraph 9(g) above, if any. In addition,  each Participant
shall  be  provided  information   concerning  Interneuron  equivalent  to  that
information generally made available to Interneuron's common stockholders.

               17. PLAN TERM.  This Plan shall continue until  terminated by the
Board or until all of the Shares  reserved for issuance under the Plan have been
issued.

               18.  RESTRICTION  ON ISSUANCE OF SHARES.  The  issuance of Shares
under the Plan shall be subject to compliance  with all applicable  requirements
of foreign,  federal or state law with  respect to such  securities.  A Purchase
Right may not be exercised if the  issuance of Shares upon such  exercise  would
constitute a violation of any applicable  foreign,  federal or state  securities
laws or  other  law or  regulations.  In  addition,  no  Purchase  Right  may be
exercised unless (i) a registration  statement under the Securities Act of 1933,
as amended,  shall at the time of exercise  of the  Purchase  Right be in effect
with respect to the Shares issuable upon exercise of the Purchase Right, or (ii)
in the  opinion  of legal  counsel to  Interneuron,  the  Shares  issuable  upon
exercise of the Purchase Right may be issued in accordance  with the terms of an
applicable  exemption  from the  registration  requirements  of said  Act.  As a
condition  to the  exercise  of a Purchase  Right,  Interneuron  may require the
Participant to satisfy any qualifications that may be necessary or appropriate,

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to evidence compliance with any applicable law or regulation, and to make any
representation or warranty with respect thereto as may be requested by the
Company.

               19.  LEGENDS.  The Company may at any time place legends or other
identifying  symbols  referencing any applicable  foreign,  federal and/or state
securities restrictions or any provision convenient in the administration of the
Plan on some or all of the  certificates  representing  Shares  issued under the
Plan. The Participant shall, at the request of Interneuron,  promptly present to
Interneuron any and all certificates  representing Shares acquired pursuant to a
Purchase  Right in the  possession of the  Participant in order to carry out the
provisions of this  subparagraph.  Unless  otherwise  specified by  Interneuron,
legends placed on such  certificates may include but shall not be limited to the
following:

                  "THE SHARES EVIDENCED BY THIS CERTIFICATE WERE ISSUED BY THE
CORPORATION TO THE REGISTERED HOLDER UPON THE PURCHASE OF SHARES UNDER THE
EMPLOYEE STOCK PURCHASE PLAN AS DEFINED IN SECTION 423 OF THE INTERNAL REVENUE
CODE OF 1986, AS AMENDED, THE TRANSFER AGENT FOR THE SHARES EVIDENCED HEREBY
SHALL NOTIFY THE CORPORATION IMMEDIATELY OF ANY TRANSFER OF THE SHARES BY THE
REGISTERED HOLDER HEREOF MADE ON OR BEFORE ______________. THE REGISTERED HOLDER
SHALL HOLD ALL SHARES PURCHASED UNDER THE PLAN IN THE REGISTERED HOLDER'S NAME
(AND NOT IN THE NAME OF ANY NOMINEE) PRIOR TO THIS DATE."

               20.  NOTIFICATION OF SALE OF SHARES.  Interneuron may require the
Participant  to give  Interneuron  prompt  notice of any  disposition  of Shares
acquired  by  exercise  of a  Purchase  Right  within two years from the date of
granting  such  Purchase  Right or one year  from the date of  exercise  of such
Purchase  Right.  Interneuron  may require that until such time as a Participant
disposes of Shares acquired upon exercise of a Purchase  Right,  the Participant
shall hold all such Shares in the Participant's name (and not in the name of any
nominee) until the lapse of the time periods with respect to such Purchase Right
referred  to  in  the  preceding  sentence.  Interneuron  may  direct  that  the
certificates evidencing Shares acquired by exercise of a Purchase Right refer to
such requirement to give prompt notice of disposition.

               21.  AMENDMENT OR  TERMINATION  OF THE PLAN. The Board may at any
time amend or terminate the Plan,  except that such termination shall not affect
Purchase  Rights  previously  granted under the Plan, nor may any amendment make
any change in a Purchase  Right  previously  granted  under the Plan which would
adversely affect the right of any Participant (except to the extent permitted by
the  Plan or as may be  necessary  to  qualify  the  Plan as an  employee  stock
purchase plan pursuant to section 423 of the Code or to obtain  qualification or
registration of the Shares under applicable foreign, federal or state securities
laws).  In  addition,  an  amendment  to  the  Plan  must  be  approved  by  the
stockholders  of the Company  within  twelve (12) months of the adoption of such
amendment if such  amendment  would change the number of Shares  authorized  for
issuance  under the Plan or would change the  definition  of the  employees  (or
class  of  employees)  eligible  to  participate  in  the  Plan,  including  the
corporations  that may be  designated by the Board as  Participating  Companies.
Furthermore,  the approval of the Company's stockholders shall be sought for any
amendment to the Plan for which the Board deems stockholder approval necessary 

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                                      -11-

<PAGE>


in order to comply with Rule 16b-3  promulgated under section 16 of the Exchange
Act.

                  The foregoing Interneuron Pharmaceuticals, Inc. 1995 Employee
Stock Purchase Plan was duly adopted by the Board of Directors of the Company on
the 3rd day of February, 1995,and most recently amended on February 21,1996.

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