INTERNEURON PHARMACEUTICALS INC
8-K, 1998-10-02
PHARMACEUTICAL PREPARATIONS
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT


                       Pursuant to Section 13 or 15(d) of
                       the Securities Exchange Act of 1934




Date of Report:  September 28, 1998



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


                                    DELAWARE
                 (State of other jurisdiction of incorporation)


          0-18728                                           043047911
(Commission File Number)                       (IRS Employer Identification No.)


One Ledgemont Center, 99 Hayden Avenue, Lexington, Massachusetts           02421
(Address of principal executive offices)                              (Zip Code)


Registrant's telephone no. including area code:  (781) 861-8444
<PAGE>   2
Item 5.           Other Events

Preliminary Approval of Settlement Agreement

         On September 28, 1998, Interneuron Pharmaceuticals, Inc. (the
"Company") announced that the U.S. District Court for the Eastern District of
Pennsylvania (the "Court") preliminarily approved an Agreement of Compromise and
Settlement (the "Settlement Agreement") between the Company and the Plaintiffs'
Management Committee ("PMC") relating to the proposed settlement of all product
liability litigation and claims against the Company relating to Redux(TM)
(dexfenfluramine). As part of the Settlement Agreement, the Company and the PMC
entered into a royalty agreement relating to a portion of the payments proposed
to be made to the settlement fund.

         Reference is made to (i) the Company's press release dated September
28, 1998 filed as Exhibit 99.1 hereto; (ii) the Agreement of Compromise and
Settlement, filed as Exhibit 99.2 hereto; and (iii) the Royalty Agreement, filed
as Exhibit 99.3 hereto, each incorporated by reference herein.

Termination of Intercardia collaboration with Astra Pharmaceuticals (formerly 
Astra-Merck)

         On September 30, 1998, Intercardia, Inc., the Company's majority-owned
subsidiary ("Intercardia"), and Astra Pharmaceuticals, L.P. (formerly
Astra-Merck Inc.) ("Astra") announced termination of an agreement among
Intercardia, CPEC, Inc., a majority-owned subsidiary of Intercardia which is
minority-owned by the Company, and Astra for the U.S. development and
commercialization of BEXTRA(R) (bucindolol HCl), a drug under development for
the treatment of congestive heart failure. In connection with the termination of
this agreement, Astra agreed to return to Intercardia and CPEC all its rights
and information relating to bucindolol and has made a $4 million cash payment to
CPEC.

         Reference is made to the press release of Intercardia and Astra dated
September 30, 1998 filed as Exhibit 99.4 hereto and incorporated by reference
herein.

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

         (c)  Exhibits

              99.1 Press Release of the Company dated September 28, 1998
              99.2 Agreement of Compromise and Settlement, including
                   Appendices dated September 21, 1998 
              99.3 Royalty Agreement between the Company and the
                   PMC dated September 21, 1998
              99.4 Press Release of Intercardia and Astra dated September 
                   30, 1998



                                       -2-
<PAGE>   3
                                   SIGNATURES


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

                                    INTERNEURON PHARMACEUTICALS, INC.



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

Dated:  October 2, 1998






<PAGE>   1

FOR IMMEDIATE RELEASE                                             EXHIBIT 99.1
- ---------------------

CONTACT AT (781) 402-3410
        GLENN L. COOPER, M.D.                        WILLIAM B. BONI
        PRESIDENT AND CHIEF EXECUTIVE OFFICER        VP, CORP. COMMUNICATIONS

               COURT ISSUES PRELIMINARY APPROVAL OF INTERNEURON'S

                        FORMAL REDUX SETTLEMENT AGREEMENT

LEXINGTON, MA, September 28, 1998 - Interneuron Pharmaceuticals, Inc. (NASDAQ:
IPIC) today announced that the U.S. District Court for the Eastern District of
Pennsylvania has preliminarily approved a formal agreement to settle all product
liability litigation and claims against the Company related to Redux(TM)
(dexfenfluramine). The Court also conditionally certified a limited fund class
action.

The Court order follows a letter of understanding outlining terms of the
settlement announced on September 3, 1998 and execution of the formal settlement
agreement between the Company and the Plaintiffs' Management Committee,
consisting of attorneys designated by the Court to represent plaintiffs in the
multi-district litigation relating to Redux. A fairness hearing on the
settlement has been scheduled for February 25, 1999.

"This action marks important, timely progress toward the finalization of the
settlement of Redux product liability litigation," said Glenn L. Cooper, M.D.,
president and chief executive officer of Interneuron. "It represents a
significant step toward putting this litigation behind us as we focus on
continuing progress with our products in late-stage clinical development."

Redux was a prescription anti-obesity drug withdrawn from the market in
September 1997 by Interneuron and Wyeth-Ayerst Laboratories, a division of
American Home Products Corporation.

The limited fund class action established by this settlement includes all
persons in the United States who used Redux, and certain other persons such as
their family members, who would be bound by the terms of the settlement.
Membership in the class is mandatory for all persons included within the class
definition.

                                    - MORE -
Page 1 of 2

<PAGE>   2



Under the terms of the proposed settlement, class members asserting claims
against Interneuron will be required to seek compensation only from the
settlement fund, and their lawsuits against Interneuron will be dismissed. By
agreeing to the proposed settlement, Interneuron does not admit liability to any
plaintiffs or claimants.

As previously announced, the settlement agreement requires Interneuron to
deposit a total of $15 million in three installments into a settlement fund. The
first installment of $2 million has been deposited into the settlement fund. A
second installment of $3 million is to be made after the settlement agreement is
approved by the Court, which would follow the fairness hearing. These
installments will be returned to Interneuron if the settlement does not become
final. A third installment of $10 million, plus interest, is to be made after
the settlement becomes final.

In addition, the proposed settlement provides for Interneuron to deposit all
remaining and available insurance proceeds related to Redux into the settlement
fund. Interneuron has also agreed to make certain royalty payments to the
settlement fund, in the total amount of $55 million, based upon sales of
Interneuron products and other revenues, over a seven year period after the
settlement becomes final. If, at the end of that seven year period, the amount
of royalty payments made by Interneuron is less than $55 million, the settlement
fund will receive shares of Interneuron stock in an amount equal to the unpaid
balance divided by approximately $7.50 per share. At or prior to the time the
settlement becomes final, the Company will incur charges to operations equal to
the estimated fair value of the consideration given, exclusive of insurance
proceeds. The formal settlement will not become final until approved by the
Court and the time for filing appeals has passed or all appeals have been
exhausted.

Interneuron Pharmaceuticals and its majority-owned subsidiary, Intercardia, Inc.
(NASDAQ: ITRC) are engaged in the development and commercialization of a
portfolio of products and product candidates for central nervous system,
cardiovascular and other disorders, including multiple compounds in late-stage
clinical development.

Except for the descriptions of historical facts contained herein, this press
release contains forward-looking statements that involve risks and uncertainties
as detailed from time to time in the Company's filings under the Securities Act
of 1933 and the Securities Exchange Act of 1934, including in particular, risks
relating to the withdrawal of Redux and Redux-related litigation, including risk
relating to the finalization of the proposed related settlement, uncertainties
relating to regulatory approvals and clinical trials; product liability; the
need for additional funds; the early stage of products under development; risks
relating to product launches and managing growth; government regulation, patent
risks, dependence on third parties and competition.

                                       ###


Page 2 of 2


<PAGE>   1
                                                                    EXHIBIT 99.2


                       IN THE UNITED STATES DISTRICT COURT
                    FOR THE EASTERN DISTRICT OF PENNSYLVANIA

IN RE: DIET DRUGS (PHENTERMINE,                        :
FENFLURAMINE, DEXFENFLURAMINE)                         :        MDL DOCKET NO.
PRODUCTS LIABILITY LITIGATION                          :        1203
                                                       :
THIS DOCUMENT RELATES TO ALL                           :
CASES                                                  :
SHARON WISH v. INTERNEURON                             :        CIVIL ACTION NO.
PHARMACEUTICALS, INC.                                  :        98-CV-20594
                                                       :

                     AGREEMENT OF COMPROMISE AND SETTLEMENT

         Proposed Class Representative Sharon Wish, by and through her counsel,
the Plaintiffs' Management Committee ("PMC") in the above-captioned
multidistrict litigation and the Defendant Interneuron Pharmaceuticals, Inc.
("Interneuron"), hereby enter into this Agreement of Compromise and Settlement,
providing for settlement of the claims herein described against Interneuron
pursuant to the terms and conditions set forth below, and subject to the
approval of the Court.

1        BACKGROUND

         1.1      Interneuron is a Delaware corporation with its principal place
                  of business in Massachusetts. Interneuron and a division of
                  American Home Products Corporation co-promoted the
                  prescription, anti-obesity drug dexfenfluramine under the
                  brand name Redux(TM). Boehringer Ingelheim Pharmaceuticals,
                  Inc., encapsulated and packaged Redux(TM) for Interneuron, but
                  it did not participate in the design, development or promotion
                  of the drug. Redux(TM) was approved by the United States Food
                  and Drug Administration for use in the treatment of obesity in
                  April, 1996. It was first marketed in the United States in
                  June, 1996. Redux(TM) was withdrawn from the market on or 
                  about September 15, 1997.

         1.2      After Redux(TM)'s withdrawal from the market, Interneuron was
                  sued in
<PAGE>   2
                  a number of individual and purported class actions filed in
                  state and federal courts nationwide. These actions allege
                  claims for compensatory and punitive damages and equitable
                  relief against Interneuron for alleged diet drug-related
                  injuries. On December 10, 1997, the Judicial Panel on
                  Multidistrict Litigation created MDL No. 1203 In re Diet Drugs
                  (Phentermine, Fenfluramine, Dexfenfluramine) Products
                  Liability Litigation, transferring all of the federal cases
                  against Interneuron to the United States District Court for
                  the Eastern District of Pennsylvania. As of the date of this
                  Settlement Agreement, Interneuron has pending against it over
                  650 state and federal actions in 46 states.

         1.3      The Plaintiffs' Management Committee ("PMC") in MDL No. 1203
                  has conducted substantial discovery against Interneuron.
                  Interneuron has responded to document requests by producing
                  over a million pages of documents into the MDL No. 1203
                  Document Depository. Interneuron has responded to plaintiffs'
                  written interrogatories, and the PMC has had access to the
                  transcripts of depositions of Interneuron's senior personnel
                  conducted in state court litigation.

         1.4      Interneuron has denied and continues to deny any wrongdoing or
                  liability to plaintiffs of any kind and has asserted many
                  affirmative defenses. Both the PMC and Interneuron recognize
                  the uncertainty and risks associated with the outcome of
                  litigation. They also recognize the significant costs involved
                  in litigating mass product liability cases through trials and
                  appeals. In entering into this Settlement Agreement, both the
                  PMC and Interneuron have extensively analyzed the strengths
                  and weaknesses of their respective cases on the facts and the
                  law.

         1.5      Over the last five months, Interneuron and the PMC have
                  explored


                                       -2-
<PAGE>   3
                  settling the cases pending against Interneuron. During these
                  settlement discussions, Interneuron expressed its belief that
                  the cost of defending the litigation nationwide and the
                  massive liability exposure presented by these cases created a
                  substantial risk that its assets would be insufficient to
                  defend itself in the pending and anticipated cases, much less
                  meet all of the plaintiffs' claims.

         1.6      The PMC accepted Interneuron's invitation to independently
                  evaluate the company's financial condition. The PMC hired an
                  expert, Dr. Harvey Rosen, who examined Interneuron's financial
                  statements and extensively interviewed Interneuron's President
                  and Chief Executive Officer, Chief Financial Officer, and the
                  Executive Vice President for Research and Development. Dr.
                  Rosen concluded (and the PMC agreed) that there was a
                  substantial risk that Interneuron's assets, including
                  insurance coverage, would be insufficient to defend the
                  company and/or satisfy the claims against the company, and
                  that the costs of defense alone or together with early
                  recovery by a few individual plaintiffs would deprive the rest
                  of the Class Members of a sufficient fund from which to
                  recover.

         1.7      On September 1, 1998, Plaintiff Wish, represented by the PMC,
                  filed a class action complaint in the United States District
                  Court for the District of Pennsylvania seeking certification
                  of a mandatory, limited fund class action as to Interneuron
                  pursuant to Federal Rule of Civil Procedure 23(b)(1)(B). On
                  that same date, she filed a motion for conditional class
                  certification. On September 3, 1998, Interneuron and the PMC
                  signed a Letter of Understanding proposing a limited fund,
                  mandatory class action settlement of all products liability
                  litigation (pending and anticipated) against the company. This
                  Letter of


                                       -3-
<PAGE>   4
                  Understanding was the result of prolonged adversarial
                  negotiations conducted at arms' length. In conjunction with
                  the filing of the Letter of Understanding, the Court in MDL
                  No. 1203 issued Pretrial Order No. 270, which stayed the
                  federal litigation against Interneuron. The company filed a
                  response to Plaintiff's motion on September 14, 1998, that
                  supported certification of a mandatory, limited fund class.

         1.8      Based on its analysis of the facts involving Interneuron's
                  financial condition and the facts and law underlying the Class
                  Members' claims against the company, the PMC has concluded
                  that the settlement provided for by this Agreement is the best
                  possible result for the class as a whole and is fair,
                  reasonable and adequate, and therefore in the best interests
                  of the class.

         1.9      Interneuron has concluded that the settlement provided for by
                  this Agreement is desirable to provide for the continued
                  viability of the company, avoid the time and enormous expense
                  of defending protracted litigation on a nationwide basis, and
                  provide a final and complete resolution of Interneuron's
                  Redux(TM)-related claims.

         1.10     The PMC and Interneuron understand and agree that this
                  Settlement Agreement is predicated, first and foremost, on the
                  notion that only through a mandatory class action can all
                  persons with health-related claims against Interneuron be
                  assured an equitable opportunity to seek a recovery of damages
                  against the company. The parties recognize that if the
                  litigation against Interneuron is allowed to continue on its
                  present course, Interneuron's resources will be consumed and
                  most, if not all, claimants will recover nothing, regardless
                  of the seriousness of their injuries or the merits of their
                  claims. Nothing short of global resolution and bar of all
                  claims against the company - including


                                       -4-
<PAGE>   5
                  Derivative Claims and claims for contribution and indemnity -
                  can prevent this injustice by preserving enough assets to
                  generate a fund from which all claimants may seek an equitable
                  distribution.

2        GENERAL PROVISIONS

         NOW, THEREFORE, the undersigned parties agree as follows, and the PMC
recommends, subject to the approval of the Court:

         2.1      Class Representative Sharon Wish, on behalf of the class, and
                  Interneuron now desire to settle the disputes existing between
                  them, subject to the terms set forth below, which are the
                  result of prolonged, extensive, arms-length negotiations
                  between the parties.

         2.2      The undersigned attorneys of the PMC represent and warrant
                  that they have the authority to enter into this Agreement on
                  behalf of the proposed Class Representative, Plaintiff Sharon
                  Wish, the PMC, and all of the individual plaintiffs
                  represented by members of the PMC.

         2.3      Interneuron represents and warrants that it has all requisite
                  corporate power and authority to execute, deliver and perform
                  this Agreement and to consummate the transactions contemplated
                  hereby. The execution, delivery and performance by Interneuron
                  of this Agreement and the consummation by it of the actions
                  contemplated hereby have been duly authorized by all necessary
                  corporate action on the part of Interneuron. This Agreement
                  has been duly and validly executed and delivered by
                  Interneuron's authorized agent.

         2.4      Neither this Agreement, nor any exhibit, document or
                  instrument delivered hereunder is intended to be or shall be
                  construed as or deemed to be evidence of an admission or
                  concession by Interneuron of any liability or wrongdoing or of
                  the truth of any allegations asserted by the Class


                                       -5-
<PAGE>   6
                  Representative, Class Members or any other persons, and none
                  of them shall be admissible in evidence for any such purpose
                  in this or any other proceeding, except that this Agreement is
                  admissible to enforce its terms. Likewise, neither this
                  Agreement, approved or not approved, nor any exhibit, document
                  or instrument delivered hereunder, nor any statement,
                  transaction or proceeding in connection with the negotiation,
                  execution or implementation of this Agreement (including the
                  Letter of Understanding dated September 3, 1998) is intended
                  to be or shall be construed as or deemed to be evidence of an
                  admission or concession by the Class Representative, PMC or
                  Class Members, of any lack of merit in their claims.

         2.5      The headings of the sections and paragraphs of this Agreement
                  are included for convenience only and shall not be deemed to
                  constitute part of this Agreement or to affect its
                  construction.

         2.6      The parties agree that Class Counsel or their agents received
                  or will receive from Interneuron all information deemed
                  reasonably necessary to an examination of Interneuron's
                  insurance coverage and financial condition in connection with
                  this Agreement. The parties agree to cooperate in good faith
                  on any additional investigation that may be necessary on these
                  issues in connection with the Court's evaluation of the
                  fairness and adequacy of this Agreement. Specifically,
                  Interneuron agrees to grant reasonable requests from Class
                  Counsel for documents or interviews with Interneuron's
                  employees on the subjects of Interneuron's financial condition
                  and insurance coverage. All non-public information provided by
                  Interneuron shall be "confidential" information and shall be
                  used by Class Counsel solely for the purposes of establishing
                  whether Interneuron is a "limited fund" such that an action
                  against it should


                                       -6-
<PAGE>   7
                  proceed as a class action pursuant to Fed. R. Civ. P.
                  23(b)(1)(B) and whether the settlement provided in this
                  Agreement is fair, reasonable, adequate, and in the best
                  interest of the Class. Such confidential information may be
                  disclosed to any other person only if such person has properly
                  filed an objection to the terms of the proposed settlement and
                  has signed a Confidentiality Agreement limiting the further
                  disclosure or use of the information. Such confidential
                  information shall be disclosed on the public record only upon
                  an order of the Court for good cause shown. Notwithstanding
                  the foregoing, persons that are competitors of Interneuron
                  shall not be entitled to receive Interneuron's confidential
                  information except by order of the Court upon a showing of
                  extraordinary need.

3        DEFINITIONS

         For the purposes of this Agreement:

         3.1      The "Agreement" or "Settlement Agreement" refers to this
                  Agreement of Compromise and Settlement, together with all
                  appendices thereto.

         3.2      "American Home Products Corp." or "AHP" shall mean American
                  Home Products Corporation and its subsidiaries, divisions,
                  affiliates, and other related entities.

         3.3      The "Claims Administrator" means the person appointed by the
                  Court to administer the settlement and make distributions to
                  Class Members.

         3.4      The "Class" is a mandatory, non-opt out class under Fed. R.
                  Civ. P. 23(b)(1)(B) that includes:

                  3.4.1    All persons who obtained Redux(TM) in the United 
                           States or its territories and used the product prior 
                           to the Notice Date;

                  3.4.2    All persons (except the United States Government)
                           asserting


                                       -7-
<PAGE>   8
                           standing to sue Interneuron or any Released Party as
                           a result of another person's obtaining Redux(TM) in 
                           the United States or its territories and using the
                           product prior to the Notice Date (including spouses,
                           children, other family members, heirs, beneficiaries,
                           executors, administrators, legal representatives,
                           successors, subrogees or assigns of any person who
                           used Redux(TM));

                  3.4.3    All persons in the United States and its territories
                           who used a Diet Drug other than Redux(TM) prior to 
                           the Notice Date and who seek to hold Interneuron or 
                           any Released Party liable on a theory of conspiracy,
                           concert of action, aiding and abetting, negligent
                           undertaking, "Good Samaritan" liability, deceptive
                           trade practices, consumer fraud, unfair business
                           practices or any similar legal theory;

                  3.4.4    All persons in the United States and its territories
                           (except the United States Government) asserting
                           standing to sue Interneuron or any Released Party
                           based upon a theory of conspiracy, concert of action,
                           aiding and abetting, negligent undertaking, "Good
                           Samaritan" liability, deceptive trade practices,
                           consumer fraud, unfair business practices or any
                           similar legal theory as a result of another person's
                           use of a Diet Drug other than Redux(TM) prior to the
                           Notice Date, including spouses, children, other
                           family members, heirs, beneficiaries, executors,
                           administrators, legal representatives, successors,
                           subrogees or assigns of any person who used a Diet
                           Drug other than Redux(TM).


                                       -8-
<PAGE>   9
         3.5      "Class Counsel" means counsel approved by the Court to serve
                  as attorney(s) for the Class in the above-captioned
                  litigation.

         3.6      "Class Members" means all persons included in the Class, as
                  defined above.

         3.7      "Class Representative" means Sharon Wish and/or any other
                  individuals approved by the Court as class representatives.

         3.8      The "Court" means the United States District Court for the
                  Eastern District of Pennsylvania.

         3.9      A "Derivative Claim" is one asserted by a person who does not
                  claim to have used Redux(TM) or a Diet Drug other than 
                  Redux(TM), but instead seeks to recover for losses sustained 
                  as a result of another person's use of Redux(TM) or a Diet 
                  Drug other than Redux(TM). "Derivative Claims" include, 
                  without limitation, claims for loss of consortium, services, 
                  society and affection and/or reimbursement of medical 
                  expenses, regardless of whether such claims are classified as 
                  "derivative claims" under the law of the applicable 
                  jurisdiction. "Derivative Claim" as used herein does not 
                  include shareholder derivative claims pursued pursuant to 
                  Federal Rule of Civil Procedure 23.1 or any state analogue of 
                  Federal Rule of Civil Procedure 23.1.

         3.10     "Diet Drug" includes Redux(TM), dexfenfluramine, Pondimin,
                  fenfluramine and phentermine.

         3.11     "Diet Drug Litigation" means litigation brought by persons
                  seeking to recover damages and/or injunctive or equitable
                  relief arising out of any person's purchase or use of a Diet
                  Drug. As used herein, "Diet Drug Litigation" includes, without
                  limitation, actions in which persons seek legal or equitable
                  relief for personal injury, bodily injury, past or future
                  medical monitoring or


                                       -9-
<PAGE>   10
                  screening expenses (whether as a lump sum or a
                  court-supervised fund), reimbursement of the cost of
                  purchasing a Diet Drug, disgorging of profits from Diet Drug
                  sales, or injunctive relief directing a defendant to take any
                  action such as providing notice to consumers of alleged health
                  risks associated with a Diet Drug or to finance studies of the
                  alleged health risks associated with a Diet Drug. As used
                  herein, "Diet Drug Litigation" also includes litigation
                  brought by persons seeking to recover for Derivative Claims.

         3.12     "Final Approval Date" means the date on which the Court enters
                  a judgment pursuant to Federal Rules of Civil Procedure 23(e)
                  and 54(a) stating its final approval of this Agreement and
                  dismissing all Released Claims.

         3.13     "Final Settlement Date" means the earliest of the following:


                  3.13.1   The date on which the time for appeal from the
                           Court's judgment approving this Agreement has elapsed
                           without any appeals being filed; or

                  3.13.2   All appeals from the Court's judgment approving this
                           Agreement have been exhausted, and no further appeal
                           may be taken.

         3.14     "Interneuron" means the defendant Interneuron Pharmaceuticals,
                  Inc., a Delaware corporation.

         3.15     The "Interneuron Class Action Settlement Fund" or the "Fund"
                  means all funds and common stock deposited in an account with
                  a Court-approved Trustee pursuant to the terms of this
                  Agreement and an Indenture of Trust in a form to be approved
                  by the Court.

         3.16     A "Judgment Credit" is an amount that defendants in Diet Drug
                  Litigation may use to offset a judgment in favor of a Class
                  Member for injuries adjudicated to have been caused by
                  Redux(TM), and is calculated by dividing the


                                      -10-
<PAGE>   11
                  Fund balance on the date of the request for a Judgment Credit
                  by the number of registered claimants on that date.

         3.17     "Notice Date" means the last date on which Notice of this
                  Agreement is published to Class Members in a newspaper of
                  general circulation pursuant to order of the Court.

         3.18     "Phentermine Defendants" means entities or persons that
                  marketed, sold or distributed phentermine and have been sued
                  in Diet Drug Litigation.

         3.19     The "PMC" means those attorneys appointed by the Court to
                  serve on the Plaintiffs' Management Committee in the
                  above-captioned litigation.

         3.20     "Pondimin" means fenfluramine marketed under the brand name
                  Pondimin.

         3.21     "Preliminary Approval Date" means the date on which the Court
                  enters an order preliminarily approving this Agreement
                  pursuant to Federal Rule of Civil Procedure 23(e).

         3.22     "Redux(TM)" means dexfenfluramine marketed under the brand 
                  name Redux(TM).

         3.23     The "Released Claims" are:

                  3.23.1   All claims that have, might have been, or in the
                           future could be asserted by Class Members against
                           Interneuron or any Released Parties arising out of
                           any Class Member's use of Redux(TM), including 
                           without limitation all claims for damages or remedies
                           of whatever kind or character, known or unknown, that
                           are now recognized by law or that may be created or
                           recognized in the future by statute, regulation,
                           judicial decision, or in any other manner, for actual
                           damages, exemplary and punitive damages,


                                      -11-
<PAGE>   12
                           penalties of any kind, personal injuries or death,
                           mental or physical pain or suffering, loss of wages,
                           income, earnings, and earning capacity, doctor,
                           hospital, nursing and drug bills, medical expenses,
                           Derivative Claims, loss of consortium, companionship,
                           society or affection, damage to familial relations,
                           loss of enjoyment of life, economic or business
                           losses, disgorgement of profits, prejudgment and
                           postjudgment interest, medical monitoring or
                           screening, injunctive or declaratory relief, and any
                           other loss or detriment of any kind.

                  3.23.2   All claims based upon a theory of conspiracy, concert
                           of action, aiding and abetting, negligent
                           undertaking, "Good Samaritan" liability, deceptive
                           trade practices, consumer fraud, unfair business
                           practices or any similar legal theory that has, might
                           have been, or in the future could be asserted by any
                           Class Member against Interneuron or any Released
                           Parties arising out of a Class Member's use of a Diet
                           Drug other than Redux(TM); including without 
                           limitation all claims for damages or remedies of 
                           whatever kind or character, known or unknown, that 
                           are now recognized by law or that may be created or
                           recognized in the future by statute, regulation,
                           judicial decision, or in any other manner, for actual
                           damages, exemplary and punitive damages, penalties of
                           any kind, personal injuries or death, mental or
                           physical pain or suffering, loss of wages, income,
                           earnings, and earning capacity, doctor, hospital,
                           nursing and drug bills, medical expenses, Derivative
                           Claims, loss of consortium, companionship, society or
                           affection,


                                      -12-
<PAGE>   13
                           damage to familial relations, loss of enjoyment of
                           life, economic or business losses, disgorgement of
                           profits, prejudgment and postjudgment interest,
                           medical monitoring, injunctive or declaratory relief,
                           and any other loss or detriment of any kind.

         3.24     The "Released Parties" are:

                  3.24.1   Notwithstanding any other section or subsection of
                           this Agreement, Interneuron, Boehringer Ingelheim
                           Pharmaceuticals, Inc., their respective parents,
                           subsidiaries, affiliates, divisions, current and
                           former officers, directors, employees, attorneys, and
                           agents; and each of their insurers (including
                           Columbia Casualty Co., Reliance Insurance Company of
                           Illinois, and New Hampshire Insurance Company), but
                           only to the extent of the insurance set forth in
                           Appendix B hereto and only to the extent that the
                           insurer has tendered its unimpaired policy limits
                           without reservation of rights; provided, however,
                           that Boehringer Ingelheim Pharmaceuticals, Inc. shall
                           not be a Released Party for any claim arising from
                           defects in the manufacture or packaging of Redux(TM).

                  3.24.2   Any and all predecessors and/or shareholders of
                           Interneuron and/or Boehringer Ingelheim
                           Pharmaceuticals, Inc.; provided, however, that (i)
                           any predecessor and/or shareholder of Interneuron
                           and/or Boehringer Pharmaceuticals, Inc. who is or
                           becomes a defendant in Diet Drug Litigation shall be
                           considered a Released Party pursuant to this
                           subsection only to the extent that such entity is
                           sued in its capacity as a predecessor and/or


                                      -13-
<PAGE>   14
                           shareholder of Interneuron and/or Boehringer
                           Pharmaceuticals, Inc. and (ii) no person or entity
                           described in this subsection shall be released from
                           any claims based upon its own independent negligence
                           or culpable conduct.

                  3.24.3   Any and all successors to Interneuron and/or
                           Boehringer Ingelheim Pharmaceuticals, Inc.; provided,
                           however, that (i) any current or future defendant in
                           Diet Drug Litigation who becomes a successor to
                           Interneuron and/or Boehringer Ingelheim
                           Pharmaceuticals, Inc. by reason of a merger,
                           acquisition, consolidation or otherwise shall be
                           considered a Released Party pursuant to this
                           subsection only to the extent that such entity is
                           sued in its capacity as a successor of Interneuron
                           and/or Boehringer Pharmaceuticals, Inc. and (ii) no
                           person or entity described in this subsection shall
                           be released from any claims based upon its own
                           independent negligence or culpable conduct.

                  3.24.4   All distributors of Redux(TM), including wholesale
                           distributors, private label distributors,
                           pharmacists, retail distributors, physicians,
                           hospitals and clinics, and their respective
                           predecessors, successors, parents, subsidiaries,
                           affiliates and divisions, and their respective
                           current and former shareholders, officers, directors,
                           employees, attorneys, agents, and insurers; provided
                           that (i) such persons and entities described in this
                           subsection shall be released only as to Released
                           Claims as to which such persons would have a
                           contractual, common law, or statutory right of
                           indemnity against Interneuron, and (ii) no person or
                           entity described in this


                                      -14-
<PAGE>   15
                           subsection shall be released from any claims based,
                           in whole or in part, upon its own independent
                           negligence or culpable conduct (including without
                           limitation negligence claims or claims for
                           professional malpractice asserted against physicians,
                           health care providers and diet centers).

                  3.24.5   Neither AHP nor Servier are Released Parties under
                           any of the subsections of this section 3.24.

         3.25     The "Royalty Agreement" refers to the Royalty Agreement
                  attached hereto as Appendix A.

         3.26     The "Royalty Term" shall mean the period commencing on the
                  Final Settlement Date and ending seven (7) years from the
                  Final Settlement Date.

         3.27     "Servier" shall mean Les Laboratoires Servier, S.A. and its
                  subsidiaries, divisions, affiliates, and other related
                  entities.

         3.28     "Stay Date" means the date upon which the Court enters an
                  order staying and enjoining all pending state and federal
                  proceedings and those commenced hereafter regarding Released
                  Claims, including claims for contribution and indemnity,
                  against Interneuron and the Released Parties.

4        PROPOSED ORDERS

         4.1      The parties to this Agreement shall promptly submit this
                  Agreement to the Court and jointly request the Court to enter
                  an order in the form annexed hereto as Appendix C:

         (i)      conditionally certifying a class pursuant to Federal Rule of
                  Civil Procedure 23(b)(1)(B);

         (ii)     preliminarily approving the Settlement Agreement;

         (iii)    temporarily staying and enjoining all pending state and
                  federal proceedings and


                                      -15-
<PAGE>   16
                  those commenced hereafter regarding Released Claims, including
                  claims for contribution and indemnity, against Interneuron and
                  the Released Parties;

         (iv)     setting a hearing date to permit Class Members and any other
                  interested parties to appear and show cause why the stay
                  provided for in the immediately preceding subsection should
                  not be continued until the Court can make a final judgment on
                  final class certification and the fairness and adequacy of
                  this Settlement Agreement;

         (v)      directing the parties to submit a long form and short form
                  class notice within two weeks of the date of the order;

         (vi)     scheduling a hearing (a) to determine whether the proposed
                  settlement of the Class Action on the terms and conditions
                  provided in this Agreement is fair, reasonable and should be
                  approved by the Court; (b) to determine whether, upon Final
                  Approval judgment should be entered dismissing with prejudice
                  the class action and any other actions by Class Members
                  transferred to the Court by the Judicial Panel on
                  Multidistrict Litigation; and (c) to determine whether the
                  Court should enter an order barring and enjoining all claims
                  for contribution and/or indemnity against Interneuron and/or
                  the Released Parties arising out of or related to the Released
                  Claims; and (d) to consider all other matters deemed
                  appropriate by the Court;

         (vii)    setting forth scheduling and procedures for the implementation
                  of the terms and conditions of the proposed settlement; and

         (viii)   setting forth procedures and timing for the filing of
                  objections to the proposed settlement by Class Members and any
                  other interested parties.

         4.2      On the date of the Fairness Hearing, the parties shall jointly
                  request that the Court enter an order and judgment


                                      -16-
<PAGE>   17
         (i)      finally certifying a mandatory class pursuant to Federal Rule
                  of Civil Procedure 23(b)(1)(B);

         (ii)     approving, pursuant to Federal Rule of Civil Procedure 23(e),
                  the settlement as defined in this Agreement;

         (iii)    dismissing with prejudice and without costs the Class Action
                  and any other actions by Class Members against Released
                  Parties transferred to the Court by the Judicial Panel on
                  Multidistrict Litigation; provided, however, that actions
                  against those Released Parties defined in section 3.24 shall
                  not be dismissed to the extent that the plaintiffs in such
                  actions seek to recover for any claims not released by this
                  Agreement;

         (iv)     permanently enjoining the Class Members from initiating,
                  asserting, prosecuting, or litigating against the Released
                  Parties any actions involving Released Claims, as those terms
                  are defined in this Agreement; and

         (v)      permanently barring and enjoining all claims for contribution
                  and/or indemnity against Interneuron and/or the Released
                  Parties arising out of or related to the Released Claims.

5        CREATION OF THE INTERNEURON CLASS ACTION SETTLEMENT FUND

         5.1      On September 9, 1998, Interneuron deposited $2 million into
                  the Court's Registry for the account of the Interneuron Class
                  Action Settlement Fund, pursuant to the Letter of
                  Understanding dated September 3, 1998.

         5.2      Within a reasonable time from the date of this Agreement, the
                  Court shall appoint a Trustee pursuant to an Indenture of
                  Trust in a form to be approved by the Court. The Trustee shall
                  maintain and administer the Interneuron Class Action
                  Settlement Fund in accordance with the Settlement Agreement,
                  the Indenture of Trust, and the Royalty Agreement attached
                  hereto


                                      -17-
<PAGE>   18
                  as Appendix A.

         5.3      Within ten days after the Final Approval Date, Interneuron
                  shall deposit $3 million into the account of the Interneuron
                  Class Action Settlement Fund.

         5.4      Within ten days after the Final Settlement Date, Interneuron
                  shall deposit $10 million into the account of the Interneuron
                  Class Action Settlement Fund. In addition, on such date,
                  Interneuron shall deposit an amount equal to interest on such
                  $10 million at an annual rate equal to the average rate earned
                  by the $2 million deposited on September 9, 1998.

         5.5      Interneuron shall deposit all available and uncommitted
                  insurance proceeds remaining on the Stay Date into the account
                  of the Interneuron Class Action Settlement Fund. Insurance
                  proceeds are considered available and uncommitted only to the
                  extent that there are no unpaid bills for reasonable legal
                  expenses (including fees and disbursements) as of the Stay
                  Date, regardless of whether such bills have been forwarded to
                  Interneuron's insurance carriers, or unbilled legal expenses
                  (including fees and disbursements) for expenses incurred prior
                  to the Stay Date.

         5.6      In the event Interneuron is unable to cause its insurers to
                  pay the available and uncommitted insurance proceeds into the
                  Interneuron Class Action Settlement Fund, Interneuron shall
                  initiate a declaratory judgment action against its insurers in
                  order to compel the contribution of all available and
                  uncommitted insurance proceeds into the Interneuron Class
                  Action Settlement Fund Account. Bills for fees and expenses
                  incurred by Interneuron in connection with such declaratory
                  judgment action shall be timely submitted to and promptly paid
                  by the Interneuron Class Action Settlement Fund following
                  Court review and approval of such bills, provided however,
                  that Interneuron


                                      -18-
<PAGE>   19
                  shall seek to recover its fees and expenses associated with
                  litigating the declaratory judgment action in said action. The
                  PMC shall have the right to review and comment upon
                  Interneuron's application for payment of such litigation fees
                  and expenses. In the event that Interneuron recovers all or
                  any part of its fees and expenses incurred in litigating the
                  declaratory judgment action in said action, Interneuron shall
                  deposit such amounts (less any amounts owing to Interneuron
                  from the Fund) in the Interneuron Class Action Settlement
                  Fund.

         5.7      Additional payments to the Interneuron Class Action Settlement
                  Fund shall be made by Interneuron according to the terms of
                  the Royalty Agreement attached hereto as Appendix A. The
                  Royalty Agreement shall be executed by the PMC and Interneuron
                  contemporaneous with the execution of this Agreement.
                  Thereafter, the Indenture of Trust, which shall require the
                  Trustee to assume all Fund-related obligations under the
                  Royalty Agreement, shall be executed by the Court-appointed
                  Fund Trustee within ten days of the Trustee's appointment.

6        RELEASE/BAR OF CONTRIBUTION AND INDEMNITY CLAIMS/SUBROGATION CLAIMS

         6.1      The Released Parties are not, and in the future shall not be,
                  subject to liability or expense of any kind to any Class
                  Member with respect to any of the Released Claims.
                  Compensation from the Interneuron Class Action Settlement Fund
                  established by this Agreement shall be the exclusive remedy of
                  Class Members against the Released Parties as to any and all
                  Released Claims. Each of the Class Members is forever barred
                  from asserting any of the Released Claims against any of the
                  Released Parties. No individual Class Member shall receive
                  funds from the Interneuron Class Action Settlement Fund unless
                  he, she


                                      -19-
<PAGE>   20
                  or it executes the Release and Indemnity Agreement attached as
                  Appendix D. The mandatory, classwide release contained in this
                  section is full and complete, and the requirement that Class
                  Members execute an individual release should in no way be
                  interpreted as altering the immediate and binding effect of
                  this classwide release upon each Class Member as of the Final
                  Settlement Date.

         6.2      Upon the Final Settlement Date, each Class Member shall be
                  deemed to have covenanted and agreed that he, she or it will
                  forever refrain from instituting, maintaining, or proceeding
                  against any Released Party on account of any Released Claim,
                  including Released Claims known and not now known, suspected
                  or claimed, which such Class Member ever had, now has or
                  hereafter may have against any Released Party.

         6.3      Class Members agree to reduce any judgment that they might
                  obtain against any defendant in Diet Drug Litigation by an
                  amount equal to the total amount, if any, that they receive
                  pursuant to this Agreement (before deduction of any amounts
                  for costs and counsel fees). Class Members shall not be
                  required to further reduce any judgment that they obtain
                  against any defendant in Diet Drug Litigation by: (a) the
                  amount, percentage or share of such judgment that is or may be
                  attributable to any liability-creating conduct of the Released
                  Parties (including conduct that creates strict liability in
                  tort); (b) the pro rata share, percentage, or proportion of
                  liability that otherwise would be attributable or apportioned
                  to the Released Parties; and/or (c) any other reduction that
                  is claimed or asserted on account of the terms and conditions
                  of this Settlement Agreement and any order or release entered
                  pursuant hereto, including the proposed bar order enjoining
                  defendants in Diet Drug Litigation from seeking contribution
                  or indemnity from Interneuron or the Released Parties.


                                      -20-
<PAGE>   21
         6.4      In the event that, before a Class Member has received a
                  distribution from the Fund, any defendant (or group of
                  defendants) in Diet Drug Litigation is required to satisfy a
                  judgment in favor of the Class Member for injuries adjudicated
                  to have been caused by Redux(TM), then the defendant (or group
                  of defendants) shall be entitled to elect from one of two
                  options: (i) to receive an immediate Judgment Credit toward
                  satisfaction of the judgment, or (ii) to receive from the Fund
                  in the ordinary course of the claims administration process
                  the net settlement proceeds (if any) to which the Class Member
                  subsequently becomes entitled to receive. Any such defendant
                  (or group of defendants) shall make this election by providing
                  written notice to the Claims Administrator and the Class
                  Member by certified mail, return receipt requested, prior to
                  the time that the judgment must be satisfied. In its notice of
                  election, the defendant (or group of defendants) shall affirm,
                  subject to penalty of perjury, that it is required to satisfy
                  a judgment in favor of the Class Member arising from injuries
                  adjudicated to have been attributable in whole or in part to
                  Redux(TM) or Interneuron (or any other Released Party) and 
                  that the defendant (or group of defendants) has elected either
                  to take a Judgment Credit or to receive the Class Member's net
                  settlement proceeds upon distribution from the Fund. The
                  formula for determining the amount of the Judgment Credit on a
                  given date shall be: the Fund balance on the date of the
                  notice of election of the Judgment Credit, divided by the
                  number of registered claimants on that date. The amount of the
                  Judgment Credit shall be determined by the Court.

         6.5      The parties will jointly seek an order barring and enjoining
                  claims by other defendants in Diet Drug Litigation seeking
                  contribution and/or indemnity from Interneuron or the Released
                  Parties arising out of the sale, marketing or


                                      -21-
<PAGE>   22
                  distribution of Redux(TM). The order shall provide that, with
                  respect to the claims of each specific Class Member,
                  defendants in Diet Drug Litigation will be entitled to an
                  offset for the settlement of the Released Claims in an amount
                  equal to the gross amount received by the Class Member from
                  the Interneuron Class Action Settlement (before deduction of
                  costs and counsel fees) or, if applicable, the right set forth
                  in section 6.4 of this Agreement.

         6.6      Interneuron and the Released Parties shall be indemnified and
                  promptly paid by the Interneuron Class Action Settlement Fund,
                  by appropriate petition to the Court, for its continuing legal
                  fees and expenses incurred in the course of seeking approval
                  of this settlement and defending it on appeal, participating
                  in any discovery in Diet Drug Litigation that may be ordered
                  by the Court, and for and against all reasonable fees, costs,
                  expenses incurred and money paid in defending, settling, or
                  satisfying judgments entered in any claim or proceeding
                  involving Released Claims by any person included within the
                  definition of the Class (including cross-claims, third party
                  claims, subrogation claims, claims for contribution and/or
                  indemnity) that are not terminated as a result of the Class
                  Action Settlement Agreement or that are filed or pursued in
                  the future despite the Class Action Settlement Agreement.
                  Because of Interneuron's financial condition and cash flow
                  situation, Interneuron's petitions for reimbursement of these
                  fees, costs and expenses shall be considered on an expedited
                  basis.

         6.7      All subrogation claims (including claims by workers'
                  compensation insurers, employers, and/or healthcare insurers
                  or providers) shall be submitted within ninety days of the
                  Notice Date to the Claims Administrator or, if one is not yet
                  appointed, to the Court. All such claims shall be stamped
                  "SUBROGATION CLAIM" and shall specifically identify the
                  subrogor Class


                                      -22-
<PAGE>   23
                  Member and social security number, and shall include with
                  specificity the particulars of the subrogation claims for each
                  individual Class Member, including proof of what was actually
                  paid by the subrogee on behalf of the Class Member. Once the
                  deadline for filing subrogation claims has passed, the Court
                  -- after notice and an opportunity for subrogees to be heard
                  -- shall consider the payment from the Fund of timely
                  submitted subrogation claims, subject to equitable principles
                  as applied in the limited fund settlement context. The failure
                  of any subrogee to submit a claim by the deadline set forth in
                  this section shall constitute a waiver of such claim.

7        INJUNCTIONS

         7.1      The parties will jointly seek an order extending the stay
                  entered on September 3, 1998 to all pending and future
                  litigation (both state and federal) against any Released
                  Parties arising out of any Released Claims. The parties shall
                  request such a stay and injunction to be entered on the
                  Preliminary Approval Date.

         7.2      The parties will jointly seek a permanent injunction, barring
                  and enjoining all litigation (both state and federal),
                  including claims for contribution and indemnity, against any
                  Released Parties arising out of any Released Claims, to be
                  entered on the Final Approval Date.

         7.3      The injunction orders described in sections 7.1 and 7.2 shall
                  not operate to stay or bar any proceedings against AHP,
                  Servier, the Phentermine Defendants, or any other party in
                  Diet Drug Litigation not defined as a Released Party under
                  this Agreement. Furthermore, the orders contemplated in
                  sections 7.1 and 7.2 shall not operate to stay or bar
                  proceedings against Released Parties other than Interneuron
                  arising out of claims that are not to be


                                      -23-
<PAGE>   24
                  released under the terms of this Agreement.

         7.4      The injunction orders described in sections 7.1 and 7.2 shall
                  not prevent:

                  7.4.1    any Released Party from moving to dismiss any action
                           on the ground that the claims asserted in such action
                           have been released under this Agreement, and any
                           proceedings related to such motion;

                  7.4.2    the entry of a stipulation or order of dismissal,

                  7.4.3    removal to federal court and proceedings in federal
                           court related to the determination of federal
                           jurisdiction;

                  7.4.4    transfer of any federal actions to the federal
                           multidistrict litigation,

                  7.4.5    any party from moving to sever Released Claims
                           against Released Parties and proceedings related to
                           the resolution of such motions.

         7.5      In order to minimize Interneuron's litigation expenses and
                  maximize the amount of money in the Interneuron Class Action
                  Settlement Fund, the parties will jointly seek an order from
                  the Court enjoining Interneuron from participating in formal
                  or informal discovery proceedings in any Diet Drug Litigation
                  without the Court's approval. This proposed order is attached
                  as Appendix E. Interneuron acknowledges that additional
                  discovery against the company, including the depositions of
                  certain current employees and the completion of certain
                  document discovery, may be warranted in the context of
                  continuing Diet Drug Litigation. Such discovery, however, must
                  be coordinated to preserve the limited assets of both
                  Interneuron and the Fund, and thus it shall be conducted only
                  with the Court's coordination and approval so as to minimize
                  the cost and burden of discovery that is reasonably necessary
                  for Class


                                      -24-
<PAGE>   25
                  Members to prosecute Diet Drug claims that are not Released
                  Claims.

8        DISTRIBUTION OF SETTLEMENT PROCEEDS

         8.1      The Court will appoint a Claims Administrator who shall be
                  responsible for administering the settlement and distributing
                  the settlement proceeds in accordance with a protocol to be
                  developed by the Claims Administrator and approved by the
                  Court, after notice and an opportunity to be heard has been
                  afforded to Class Counsel, Class Members, private counsel for
                  Class Members and all other interested parties. This protocol
                  shall take account of the nature and extent of the injuries
                  sustained by the Class Members that they claim to be related
                  to the use of Redux(TM) or the conduct of Released Parties, 
                  the age of the Class Member, the health of the Class Member 
                  prior to taking Redux(TM), and such other information as the 
                  Court deems just and appropriate. The protocol also shall take
                  account of the fact that the Fund available to pay claimants
                  is, by definition, a limited one, and therefore shall
                  minimize, to the extent possible, the costs of administration.

         8.2      Until the end of the Royalty Term, the Interneuron Class
                  Action Settlement Fund shall maintain a reasonable percentage
                  of any cash deposited pursuant to the terms of this Agreement
                  as a reserve sufficient to satisfy the Fund's obligations to
                  indemnify Interneuron pursuant to section 6.6.

         8.3      The Claims Administrator may retain persons to assist him or
                  her with the administration of the Interneuron Class Action
                  Settlement Fund, including clerical personnel. All reasonable
                  expenses relating to the administration of the Fund, including
                  the compensation of the Claims Administrator and personnel
                  retained by him or her, are to be paid from the Fund, subject
                  to approval of the Court, and shall not be assessed to the
                  Released Parties.


                                      -25-
<PAGE>   26
         8.4      The Claims Administrator shall retain all records relating to
                  the payment of claims and administration of the Fund. Upon
                  reasonable notice to the Claims Administrator, the Released
                  Parties and/or Class Counsel and the PMC may, at their
                  expense, and pursuant to procedures approved by the Court,
                  inspect and copy the Claims Administrator's records.

9        COUNSEL FEES, LITIGATION COSTS AND ADMINISTRATIVE EXPENSES

         9.1      Class Counsel shall receive an award in an amount approved by
                  the Court in its sole discretion, in accordance with
                  Fed.R.Civ.P. 23(b)(1)(B), 23(d) and 23(e): (i) for
                  reimbursement of reasonable costs and expenses incurred for
                  the benefit of the Class, and (ii) as reasonable fees for
                  services performed for the benefit of the Class determined in
                  accordance with applicable standards for such fees, including,
                  as appropriate, consideration of the results achieved and the
                  contingencies involved in the performance of such services.
                  Interneuron and Class Counsel have made no agreement regarding
                  what the award of counsel fees should be.

         9.2      The PMC will recommend that the Court give appropriate
                  recognition to private fee agreements between attorneys and
                  Class Members.

         9.3      All reasonable expenses incurred in administering the
                  Settlement, including the cost of all required notices to
                  Class Members and compensation to the Claims Administrator and
                  any other person appointed by the Court or retained by the
                  Claims Administrator to assist the Administrator with the
                  administration of the Interneuron Class Action Settlement
                  Fund, shall be paid from the Fund as ordered by the Court.

         9.4      No payments may be made from the Interneuron Class Action
                  Settlement Fund prior to the Final Settlement Date except for
                  costs of notice


                                      -26-
<PAGE>   27
                  incurred pursuant to section 10.3 of this Agreement and
                  attorneys' fees and expenses incurred pursuant to sections 5.6
                  and 6.6 of this Agreement.

         9.5      In no event will Interneuron be required to make any further
                  contribution to the Interneuron Class Action Settlement Fund
                  on account of compensation to Class Counsel, private counsel
                  for Class Members, or administrative or other expenses of this
                  settlement.

10       NOTICE OF SETTLEMENT

         10.1     Within two weeks of the date of this Agreement, the parties
                  will jointly propose to the Court for its approval a long form
                  and short form of notice to be provided to Class Members and
                  all parties to pending Diet Drug Litigation in the following
                  manner:

                  10.1.1   Long form notice by mail: The long form notice of the
                           settlement shall be sent to all potential Class
                           Members with currently pending litigation against
                           Interneuron, all other parties in such cases, and all
                           attorneys of record in such cases. The long form
                           notice will also be posted by computer on the World
                           Wide Web.

                  10.1.2   Short form notice by publication: The short form
                           notice of the settlement shall be published on two
                           consecutive Fridays in USA Today, once in Parade
                           Magazine, and once in TV Guide.

         10.2     No later than one month after the Notice Date, Class Counsel
                  shall file with the Court a report describing its notification
                  efforts, with copies of published notices and lists of the
                  persons notified by mail attached.

         10.3     The costs of notice shall be paid by the Interneuron Class
                  Action Settlement Fund.


                                      -27-
<PAGE>   28
11       TERMINATION/WITHDRAWAL

         11.1     Interneuron shall have the right to withdraw from, terminate
                  and cancel its obligations under the Settlement Agreement upon
                  any of the following events:

                  11.1.1   Preliminary approval of the Settlement Agreement is
                           not entered by the Court;

                  11.1.2   A mandatory, non-opt class as defined in this
                           Agreement is not certified;

                  11.1.3   Final approval of the Settlement Agreement is not
                           entered by the Court;

                  11.1.4   Class certification and/or approval of the settlement
                           is overturned on appeal for any reason;

                  11.1.5   Pending and future litigation against the Released
                           Parties is not stayed and preliminarily enjoined on
                           the Preliminary Approval Date consistent with section
                           4.1;

                  11.1.6   Pending and future litigation against the Released
                           Parties is not permanently enjoined on the Final
                           Approval Date consistent with section 4.2;

                  11.1.7   The Class Action and all pending MDL lawsuits against
                           the Released Parties are not dismissed with prejudice
                           on the Final Approval Date consistent with section
                           4.2; or

                  11.1.8   An order is not entered by the Court permanently
                           barring contribution and indemnity claims by other
                           defendants in Diet Drug Litigation consistent with
                           section 6.5.

         11.2     The Class Representative, by and through Class Counsel and the
                  PMC,


                                      -28-
<PAGE>   29
                  shall have the right to withdraw from this Agreement if, after
                  120 days from the Preliminary Approval Date, Interneuron has,
                  in the PMC's reasonable determination, been unable to compel
                  tender of its insurance proceeds without reservation of
                  rights.

         11.3     If Interneuron withdraws from, terminates, or cancels its
                  obligations under this Agreement pursuant to section 11.1 or
                  the Class Representative withdraws from this Agreement
                  pursuant to section 11.2, all money previously deposited by
                  Interneuron, including any insurance proceeds, and any
                  interest accrued thereon shall be refunded to Interneuron and
                  its insurers (less the cost of class notice, fees and expenses
                  associated with any declaratory judgment action to compel
                  payment of insurance proceeds, and other mutually agreed upon
                  administrative expenses).

12       MISCELLANEOUS PROVISIONS

         12.1     Any Class Member who wants to receive any portion of the
                  Interneuron Class Action Settlement Fund must register as a
                  claimant by completing a Court-approved Class Member
                  Registration Form and serving a copy of the completed form on
                  the PMC and counsel for Interneuron no later than sixty (60)
                  days after the date established by the Court for the Fairness
                  Hearing. Any Class Member who fails to comply with this
                  requirement shall not be entitled to receive any portion of
                  the Fund. Any Class Member who has filed a claim against
                  Interneuron in federal or state court already is deemed to
                  have registered as a claimant to the Fund.

         12.2     The Interneuron Class Action Settlement Fund shall be
                  structured and maintained so as to constitute a "qualified
                  settlement fund" within the meaning of Treasury Regulation
                  Section 1.468B-1 and all applicable statutes, rules and


                                      -29-
<PAGE>   30
                  regulations. This is a material term of the Agreement, and the
                  parties agree to negotiate in good faith any changes to the
                  Agreement necessary so that Interneuron can obtain an opinion
                  of its tax counsel that the Fund meets the legal requirements
                  of a "qualified settlement fund."

         12.3     The Court shall retain jurisdiction over the Interneuron Class
                  Action Settlement Fund pending its final disposition and with
                  respect to implementation of the terms of this Agreement.

         12.4     The parties acknowledge that Interneuron intends to remain as
                  an ongoing business entity, subject to its right to seek to
                  merge, consolidate, or acquire other business entities, and
                  therefore, Interneuron requires cash and assets for business
                  and product development, and ongoing business interests. As
                  such, the parties acknowledge that Interneuron shall be
                  entitled to retain a cash balance and may raise capital from
                  time to time for the on-going conduct of its business,
                  including clinical trials and expenses related to the
                  development and marketing of technology and products. The
                  receipt of funds from any source (whether it be from the
                  extension of credit, issuance of securities, sale of assets,
                  proceeds received from litigation [except for proceeds of the
                  declaratory judgment action litigated as described in section
                  5.6], or otherwise) shall not cause Interneuron's obligations
                  to contribute money to the Interneuron Class Action Settlement
                  Fund to increase beyond what is provided for in this
                  Agreement. Interneuron, however, acknowledges that it will,
                  consistent with applicable law, have fiduciary duties relating
                  to the Fund, and accordingly, shall not voluntarily take any
                  action to avoid its performance under the terms of this
                  Agreement, including its obligation to make contributions of
                  money to the Fund in accordance with this Agreement.


                                      -30-
<PAGE>   31
         12.5     Commencing upon the Final Settlement Date through the
                  Termination Date (as defined in the Royalty Agreement,
                  Appendix A), the Fund shall be entitled to the following:
                  Interneuron shall provide the Fund with a copy of its Annual
                  Report on Form 10-K and Quarterly Reports on Form 10-Q, as
                  filed with the Securities and Exchange Commission; and (ii) at
                  the request of the Fund on no more than a quarterly basis,
                  Interneuron will provide the Fund with a copy of a quarterly
                  financial package, including budget information. The
                  non-public quarterly financial package shall be maintained by
                  the Fund as confidential and proprietary information and shall
                  be made available only to the Fund Trustee, the Court, and
                  such other persons that are explicitly approved by Interneuron
                  and execute a confidentiality agreement.

         12.6     No payments shall be made from the Interneuron Class Action
                  Settlement Fund unless Medicare and Medicaid claims have been
                  resolved to the satisfaction of Interneuron.

         12.7     Upon the request of any Class Member in connection with the
                  settlement of any Diet-Drug related claim, Interneuron shall
                  provide a Mutual Release, which shall release each defendant
                  in Diet Drug Litigation that settles a Diet Drug-related claim
                  with a Class Member, provided that such defendant also
                  executes the Mutual Release. This Mutual Release shall release
                  such defendant and the Released Parties (as defined in this
                  Agreement) from any and all claims, cross-claims, third-party
                  complaints, and other actions arising from claims by Class
                  Members (including all claims for contribution, indemnity
                  and/or subrogation), whether the claims are filed now or in
                  the future in any court of record, whether foreign or
                  domestic.

         12.8     As soon as practical after the Final Settlement Date, Class
                  Counsel and


                                      -31-
<PAGE>   32
                  the PMC will file motions and/or stipulations dismissing with
                  prejudice any Released Claims against Released Parties pending
                  in jurisdictions other than this Court and maintained by Class
                  Members whom they represent and will use their best efforts to
                  assist Interneuron in obtaining prompt dismissals with
                  prejudice of any other Released Claims against Released
                  Parties maintained by Class Members.

         12.9     All parties hereto agree to exercise their best efforts and to
                  take all reasonable steps necessary to effectuate the
                  Settlement set forth in this Agreement.

         12.10    This Agreement shall be binding upon and inure to the benefit
                  of the parties hereto and their respective estates, heirs,
                  successors and assigns.

         12.11    This Agreement, including the Royalty Agreement attached as
                  Appendix A, constitutes the sole and entire agreement among
                  the parties and may not be modified, amended, waived or
                  terminated except in writing duly executed by the party
                  against whom such modification, amendment, waiver or
                  termination is sought and approved by the Court. This
                  Agreement, including the Royalty Agreement, supersedes any
                  prior or contemporaneous agreement, understanding or
                  undertaking, written or oral, by and between the parties
                  regarding such subject matter. No prior draft of this
                  Agreement or the Royalty Agreement, nor any negotiations or
                  proceedings in pursuit of these Agreements, shall be offered
                  or received as evidence concerning the interpretation or
                  construction of either the Settlement Agreement or the Royalty
                  Agreement.

         12.12    Plaintiff Sharon Wish, the PMC and Interneuron assume joint
                  responsibility for the form and composition of each and all
                  provisions of this Settlement Agreement and all appendices
                  thereto. The parties further agree that


                                      -32-
<PAGE>   33
                  this Agreement and its appendices shall be interpreted as
                  though each of the parties participated equally in the
                  drafting of the provisions. No party shall assert that a
                  provision should be construed against its drafter.

         12.13    This Agreement may be executed in one or more counterparts,
                  each of which shall be deemed an original but all of which
                  together shall constitute one and the same instrument.


                                      -33-
<PAGE>   34
AGREED this 21 day of September, 1998.

                                       INTERNEURON PHARMACEUTICALS, INC.

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





                                       CO-LEAD COUNSEL FOR PLAINTIFFS'
                                       MANAGEMENT COMMITTEE AND
                                       COUNSEL FOR PLAINTIFF SHARON WISH



                                       By:/S/ Arnold Levin
                                          -------------------------------------
                                          Arnold Levin



                                       By:/S/ John Cummings
                                          -------------------------------------
                                          John Cummings



                                       By:/S/ Stanley M. Chesley
                                          -------------------------------------
                                          Stanley M. Chesley


                                      -34-

<PAGE>   1
                                                                    EXHIBIT 99.3


                                                                      




                                ROYALTY AGREEMENT


                                     BETWEEN


                        INTERNEURON PHARMACEUTICALS, INC.


                                       and


                      THE PLAINTIFFS' MANAGEMENT COMMITTEE
                        ON BEHALF OF CLASS REPRESENTATIVE
                         SHARON WISH AND THE INTERNEURON
                          CLASS ACTION SETTLEMENT FUND
<PAGE>   2
                                ROYALTY AGREEMENT


      THIS ROYALTY AGREEMENT effective this 21 day of September, 1998 (the
"Effective Date"), between Interneuron Pharmaceuticals, Inc., a corporation
organized and existing under the laws of Delaware and having its principal
office at 99 Hayden Avenue, Lexington, MA 02421 ("Interneuron") and the
Plaintiffs' Management Committee (as defined in the Settlement Agreement) on
behalf of Class Representative Sharon Wish and the Interneuron Class Action
Settlement Fund (the "PMC").


                              W I T N E S S E T H:


      WHEREAS, in connection with an Agreement of Compromise and Settlement
entered into on the Effective Date (the "Settlement Agreement"), Interneuron and
the PMC have agreed to the terms of a limited fund, mandatory class action
settlement (the "Settlement");

      WHEREAS, pursuant to the terms of the Settlement Agreement, the PMC, at
the direction of the Court, will establish the Interneuron Class Action
Settlement Fund Trust (the "Fund"); and

      WHEREAS, as partial consideration for the Settlement, Interneuron has
agreed to pay Royalty Payments (as defined herein) to the Fund, upon the terms
and conditions set forth herein;

      NOW, THEREFORE, in consideration of the foregoing premises and the mutual
covenants herein contained, the parties hereby agree as follows:


                                    ARTICLE I

                                   DEFINITIONS

      Unless specifically set forth to the contrary herein, the following terms,
whether used in the singular or plural, shall have the respective meanings set
forth below:

1.1   "Affiliate" shall mean (i) any Person of which more than fifty percent
      (50%) of the securities or other ownership interests representing the
      equity, the voting stock or general partnership interest are owned,
      controlled or held, directly or indirectly, by a Party; or (ii) any Person
      which, directly or indirectly, owns, controls or holds more than fifty
      percent (50%) (or the maximum ownership interest permitted by law) of the
      securities or other ownership interests representing the equity, the
      voting stock or, if applicable, the general partnership interest, of a
      Party.
<PAGE>   3
1.2   "Cash Dividends" shall mean any cash dividends received by Interneuron
      from its Subsidiaries related to Product sales generated in any country in
      the world.

1.3   "Common Stock" shall mean the common stock, $.001 par value, of
      Interneuron.

1.4   "Final Settlement Date" shall have the meaning set forth in the Settlement
      Agreement to which this Royalty Agreement is attached as APPENDIX A.

1.5   "GAAP" shall mean generally accepted accounting principles in the United
      States.

1.6   "Gross Sales" shall mean the actual gross amount invoiced for the sale in
      any country in the world of Interneuron Product by Interneuron to a Third
      Party. If an Interneuron Product is sold or otherwise transferred as a
      part of a package with other items to a Third Party, the Gross Sales for
      Interneuron Product shall be the Gross Sales applicable to Interneuron
      Product as if it were sold separately.

1.7   "Interneuron Product" shall mean a Product which is sold directly by
      Interneuron.

1.8   "Interneuron Receipts" shall mean Gross Sales, License Revenue and/or Cash
      Dividends.

1.9   "Letter of Understanding" shall mean the letter of understanding between
      Interneuron and PMC, dated September 3, 1998.

1.10  "License Revenues" shall mean license fees, royalties or milestone
      payments received by Interneuron from a Sublicensee related to Product
      sales generated in any country in the world. License Revenues shall not
      include any amounts received by Interneuron as reimbursements for research
      and development expenses or as equity investments in Interneuron.

1.11  "Party" shall mean Interneuron, on the one hand, or the PMC or the Fund,
      on the other, as applicable.

1.12  "Person" shall mean any individual, corporation, partnership, limited
      liability company, joint venture, trust association, unincorporated
      organization, other entity, or governmental body.

1.13  "PMC" shall have the meaning set forth in the Settlement Agreement to
      which this Royalty Agreement is attached as APPENDIX A.

1.14  "Product" shall mean any product in final form for commercial sale by
      prescription, over-the-counter, or by any other method.
<PAGE>   4
1.15  "Representative of the Fund" shall mean the PMC. By execution of this
      Royalty Agreement, the Fund grants the PMC the right and authority to act
      on behalf of the Fund to the extent set forth herein.

1.16  "Royalty Amount" shall mean $55 million.

1.17  "Royalty Conversion Price" shall mean $7.49, subject to adjustment as
      provided in SECTION 6.1.

1.18  "Royalty Term" shall mean the period commencing on the Final Settlement
      Date and ending seven (7) years from the Final Settlement Date.

1.19  "Securities Act" shall mean the Securities Act of 1933, as amended, and
      the rules and regulations promulgated thereunder.

1.20  "Sublicensed Product" shall mean a Product other than an Interneuron
      Product.

1.21  "Sublicensee" shall mean a Third Party to which Interneuron has
      sublicensed or otherwise granted rights to market a Product.

1.22  "Subsidiary" shall mean a corporation of which Interneuron owns at least
      20% of the outstanding voting securities.

1.23  "Termination Date" shall mean the last day of the Royalty Term; provided,
      however, that the Termination Date may be accelerated pursuant to the
      provisions of SECTION 7.1; further provided that if such date shall in the
      State of New York be a holiday or a day on which banks are authorized to
      close, the Termination Date shall be on the next following day which in
      the State of New York is not a holiday or a day on which banks are
      authorized to close.

1.24  "Third Party" shall mean a Person which is neither a Party nor an
      Affiliate or Subsidiary of a Party.

1.25  "Transfer" shall mean any sale, bequest, exchange, assignment or gift, the
      creation of any security interest or other encumbrance and any other
      disposition of any kind, whether voluntary or involuntary, affecting title
      to or possession of any of the Royalty Shares.

1.26  "Trustee" shall mean the financial institution appointed by the Honorable
      Louis C. Bechtle, of the United States District Court for the Eastern
      District of Pennsylvania, in connection with the Settlement.

<PAGE>   5
                                   ARTICLE II

                          ROYALTY PAYMENTS AND REPORTS

2.1   ROYALTY PAYMENTS. Subject to the terms and conditions of this Royalty
      Agreement, Interneuron shall pay to the Fund as partial consideration for
      the Settlement, cash payments (the "Royalty Payments") equal to a portion
      of Interneuron Receipts received during the Royalty Term, not to exceed in
      the aggregate, the Royalty Amount, as follows:

      (a)   seven percent (7%) of Gross Sales of Interneuron Product by
            Interneuron during each Royalty Calculation Period (as defined in
            SECTION 2.4) subject to the following conditions:

            (i)   that only one Royalty Payment shall be due with respect to the
                  same unit of Interneuron Product; and

            (ii)  no Royalty Payments shall accrue on the disposition of
                  Interneuron Product in reasonable quantities by Interneuron as
                  samples (promotion or otherwise) or as donations (for example,
                  to non-profit institutions or government agencies for a
                  non-commercial purpose);

      (b)   fifteen percent (15%) of Cash Dividends received by Interneuron
            during each Royalty Calculation Period; and

      (c)   fifteen percent (15%) of License Revenues received by Interneuron
            during each Royalty Calculation Period.

2.2   ROYALTY PAYMENT OBLIGATION. Interneuron's Royalty Payment obligation
      pursuant to SECTION 2.1 shall be effective as of the Final Settlement Date
      and shall continue until the earlier of the Termination Date or the date
      at which Interneuron has made payments to the Fund equal to the Royalty
      Amount; provided however, if, as of the Termination Date, Interneuron has
      not made Royalty Payments equal in the aggregate to the Royalty Amount,
      the provisions of SECTION 2.3 herein shall apply.

2.3   FINAL ROYALTY PAYMENT. If, on the last day of the Royalty Term the
      aggregate Royalty Payments paid by Interneuron to the Fund do not equal
      the Royalty Amount, then Interneuron shall make a payment (the "Final
      Royalty Payment") to the Fund, within ninety (90) days following the
      Termination Date, consisting of the issuance to the Fund of the number of
      shares of Common Stock (the "Royalty Shares"), rounded to the nearest
      whole number, equal to the quotient obtained by dividing (a) the number
      obtained by subtracting from the Royalty Amount the aggregate Royalty
      Payments paid to the Fund as of the Termination Date (the "Royalty
      Balance") by (b) the then effective Royalty Conversion Price.
      Notwithstanding the foregoing, Interneuron, in its sole discretion, may
      elect (the "Cash Election") to pay all or a portion of the Final Royalty
      Payment in cash


<PAGE>   6
      instead of issuing all or any portion of any Royalty Shares which may be
      payable to the Fund pursuant to the terms of this SECTION 2.3. If
      Interneuron makes a Cash Election, it shall (i) notify the Fund of such
      election within ten (10) days after the Termination Date and (ii) pay to
      the Fund cash in an amount equal to ninety percent (90%) of the fair
      market value of the Royalty Shares payable as the Final Royalty Payment
      which Interneuron has elected to be paid in cash.

2.4   REPORTS; PAYMENT OF ROYALTY. Interneuron shall furnish to the Trustee a
      written report (the "Royalty Report") on March 31, June 30, September 30,
      and December 31 of each year during the Royalty Term (the "Royalty Payment
      Dates") for each prior three month period ending December 31, March 31,
      June 30, and September 30, respectively (the "Royalty Calculation
      Periods") showing all Interneuron Receipts subject to Royalty Payments and
      the Royalty Payments accrued under this Royalty Agreement during such
      Royalty Calculation Period. Royalty Payments shown to have accrued during
      each Royalty Calculation Period shall be due and payable on the applicable
      Royalty Payment Date. Interneuron shall keep complete and accurate records
      in sufficient detail to enable the Royalty Payments hereunder to be
      determined.

2.5   AUDITS.

      (a)   Upon the written request of the Trustee and not more than once in
            each calendar year of the Royalty Term, Interneuron shall permit an
            independent certified public accounting firm of nationally
            recognized standing selected by the Trustee and acceptable to
            Interneuron, to have access during normal business hours at times
            mutually convenient to the parties and upon reasonable notice to
            Interneuron to such of the records of Interneuron as may be
            reasonably necessary to verify the accuracy of the Royalty Reports
            hereunder for any Royalty Calculation Period ending not more than
            eighteen (18) months prior to the date of such request. The
            accounting firm shall disclose to the Trustee only whether the
            Royalty Reports are correct or incorrect and the specific details
            concerning any discrepancies.

      (b)   If such accounting firm correctly concludes that additional Royalty
            Payments were owed during such period, Interneuron shall pay the
            additional Royalty Payments within sixty (60) days of the date the
            Trustee delivers to Interneuron such accounting firm's written
            report. If such accounting firm correctly concludes that Interneuron
            paid an excess amount, Interneuron will credit the excess amount
            that was paid against the next Royalty Payment due. The fees charged
            by such accounting firm shall be paid by the Fund through a credit
            against future Royalty Payments; provided, however, that if an error
            in favor of the Fund in the payment of Royalty Payments of more than
            ten percent (10%) of the Royalty Payments due hereunder for the
            period being reviewed is discovered, then the fees and expenses of
            the accounting firm shall be borne by Interneuron.

<PAGE>   7
      (c)   Upon the expiration of eighteen (18) months (subject to extension in
            the event the accounting firm correctly concludes that Interneuron
            has committed fraud in the calculation of Royalty Payments)
            following the end of any Royalty Calculation Period the calculation
            of Royalty Payments payable with respect to such Royalty Calculation
            Period shall be binding and conclusive upon the Fund, and
            Interneuron shall be released from any liability or accountability
            with respect to Royalty Payments for such Royalty Calculation
            Period.

      (d)   The Fund shall treat all financial information subject to review
            under this SECTION 2.5 in accordance with the confidentiality
            provisions of this Royalty Agreement.

2.6   PAYMENT EXCHANGE RATE. All cash Royalty Payments to the Fund under this
      Royalty Agreement shall be in United States dollars. In the case of sales
      outside of the United States, the rate of exchange to be used in computing
      the amount of currency equivalent in United States dollars shall be
      calculated monthly in accordance with GAAP based on the average of the
      conversion rates on the first and last business day of the month during
      each Royalty Calculation Period published in the Wall Street Journal,
      Eastern edition.


                                   ARTICLE III

                         REPRESENTATIONS AND WARRANTIES

3.1   REPRESENTATIONS AND WARRANTIES OF THE PMC. The PMC represents and warrants
      to Interneuron that as of the Effective Date:

      (a)   this Royalty Agreement has been duly authorized, executed and
            delivered by it; and

      (b)   except as set forth in the Settlement Agreement, no approval,
            authorization, consent, or other order or action of or filing with
            any court, administrative agency or other governmental authority is
            required for the execution and delivery by it of this Royalty
            Agreement or the consummation by it of the transactions contemplated
            hereby.

3.2   INVESTMENT REPRESENTATIONS AND WARRANTIES OF THE PMC ON BEHALF OF THE
      FUND. The PMC represents and warrants to Interneuron on behalf of the Fund
      that:

      (a)   the Royalty Shares, if any, payable to the Fund pursuant to the
            terms hereof will be acquired for investment for its own account,
            without any view to the unregistered public distribution or resale
            thereof, all without prejudice, however, to the right of the Fund,
            subject to the terms and conditions of this Royalty Agreement, at
            any time lawfully to sell or otherwise to dispose of all or any part



<PAGE>   8
            of the Royalty Shares pursuant to registration or any exemption
            therefrom under the Securities Act and applicable state securities
            laws;

      (b)   The PMC understands that the Royalty Shares, if any, to be received
            by the Fund pursuant to the terms hereof have not been registered
            under the Securities Act inasmuch as they are issuable by
            Interneuron in a transaction not involving a public offering and
            exempt from the registration requirements under the Securities Act,
            and that under the federal securities laws and applicable
            regulations the Royalty Shares may be resold without registration
            under the Securities Act only in certain limited circumstances;

      (c)   The PMC has, and the Fund will have, the capacity to evaluate the
            merits and high risks of an investment in the Royalty Shares and is
            able to bear the economic risk of this investment. The PMC has been
            provided access to all information requested by it in order to
            evaluate the merits and risks of an investment by the Fund in the
            Royalty Shares;

      (d)   The PMC acknowledges that the certificates evidencing the Royalty
            Shares to be issued to the Fund, if any, shall bear a legend
            substantially as follows:

            "THESE SECURITIES (A) ARE SUBJECT TO THE TERMS AND CONDITIONS OF A
            ROYALTY AGREEMENT, DATED SEPTEMBER 21, 1998, A COPY OF WHICH IS ON
            FILE WITH THE COMPANY AND (B) HAVE NOT BEEN REGISTERED UNDER THE
            SECURITIES ACT OF 1933, AS AMENDED. THEY MAY NOT BE SOLD, OFFERED
            FOR SALE, PLEDGED OR HYPOTHECATED, EXCEPT IN ACCORDANCE WITH THE
            TERMS OF THE ROYALTY AGREEMENT AND UNLESS A REGISTRATION STATEMENT
            IS IN EFFECT WITH RESPECT TO THE SECURITIES UNDER SUCH ACT OR AN
            EXEMPTION FROM REGISTRATION UNDER SUCH ACT."

            The foregoing legend shall be removed by Interneuron from any
            certificate at such time as the holder of the Royalty Shares
            represented by the certificate delivers to Interneuron an opinion of
            counsel to the effect that (i) the Transfer provisions of this
            Royalty Agreement have been met and that (ii) such legend is not
            required in order to establish compliance with any provisions of the
            Securities Act or at such time as the holder of such Royalty Shares
            satisfies the requirements of Rule 144(k) under the Securities Act
            (provided that Rule 144(k) as then in effect does not differ
            substantially from Rule 144(k) as in effect as of the date of this
            Royalty Agreement), and provided further that Interneuron has
            received from the holder a written representation that such holder
            has (i) complied with the Transfer provisions of this Royalty
            Agreement and (ii) satisfies the requirements of Rule 144(k) as then
            in effect with respect to such Royalty Shares.


<PAGE>   9
3.3   INTERNEURON REPRESENTATIONS AND WARRANTIES. Interneuron represents and
      warrants to the PMC on behalf of the Fund that as of the Effective Date:

      (a)   this Royalty Agreement has been duly authorized, executed and
            delivered by it;

      (b)   except as set forth in the Settlement Agreement, no approval,
            authorization, consent, or other order or action of or filing with
            any court, administrative agency or other governmental authority is
            required for the execution and delivery by it of this Royalty
            Agreement or the consummation by it of the transactions contemplated
            hereby; and

      (c)   the issuance and delivery by Interneuron of shares of Common Stock
            which may be issuable to the Fund as Royalty Shares, if any, have
            been duly authorized by all requisite corporate action of
            Interneuron and, when so issued and delivered, if ever, the Royalty
            Shares will be validly issued and outstanding, fully paid and
            nonassessable.


                                   ARTICLE IV

                                 CONFIDENTIALITY

4.1   NON-DISCLOSURE AND NON-USE OBLIGATIONS. All information disclosed by one
      Party to another Party hereunder shall be maintained in confidence and
      shall not be disclosed to any Third Party or used for any purpose except
      as expressly permitted herein without the prior written consent of the
      disclosing Party. The foregoing non-disclosure and non-use obligations
      shall not apply to the extent that such information:

      (a)   is known by the receiving Party at the time of its receipt, and not
            through a prior disclosure by the disclosing Party, as documented by
            business records;

      (b)   is properly in the public domain; or

      (c)   is subsequently disclosed to a receiving Party by a Third Party who
            may lawfully do so and is not under an obligation of confidentiality
            to the disclosing Party.

4.2   PERMITTED DISCLOSURE OF INFORMATION. Notwithstanding SECTION 4.1, a Party
      receiving information from another Party may disclose such information if
      required to be disclosed by law or court order, provided that notice is
      promptly delivered to the non-disclosing Party in order to provide an
      opportunity to challenge or limit the disclosure obligations; provided,
      however, without limiting any of the foregoing, it is understood that any
      Party may make disclosure of this Royalty Agreement and the terms hereof
      in a press release and in any filings required by the United States
      Securities and Exchange Commission and other regulatory agencies.


<PAGE>   10
                                    ARTICLE V

              RESTRICTION ON VOTING AND TRANSFER OF ROYALTY SHARES.

5.1   LIMITATION ON TRANSFER. The Fund may not Transfer (other than to
      Interneuron) any Royalty Shares except as permitted in accordance with the
      terms of this Royalty Agreement. Any purported Transfer of any Royalty
      Shares in any other manner shall be void.

5.2   RIGHT OF FIRST REFUSAL UPON PROPOSED TRANSFER OF ROYALTY SHARES.
      Interneuron shall have the right of first refusal (the "Right of First
      Refusal") to purchase Royalty Shares in the event of any proposed Transfer
      of Royalty Shares by the Fund. Accordingly, if the Fund intends to seek to
      Transfer any Royalty Shares, the Fund shall give written notice to
      Interneuron of such intention and of the proposed price, terms and, if
      known by the Fund, the name of the potential purchaser of the Royalty
      Shares. In connection with a proposed Transfer in a private transaction,
      the notice by the Fund shall also include, if known by the Fund, the names
      of the directors and majority stockholders of any corporation or the
      principals of any other entity proposed as the potential purchaser. The
      Right of First Refusal shall entitle Interneuron to purchase Royalty
      Shares on the same terms as the proposed Transfer described in the notice.
      The Right of First Refusal shall be exercisable by notice given to the
      Fund at any time within twenty (20) days of the receipt by Interneuron of
      the notice given by the Fund (the "Option Period").

      If Interneuron does not exercise its Right of First Refusal prior to the
      expiration of the Option Period, the Fund may, at any time within ten (10)
      days (the "Sale Period") following the expiration of the Option Period,
      sell for cash all, but not less than all, of the offered Royalty Shares on
      the terms proposed in the notice at a cash price per share not less than
      the minimum price proposed in the notice, provided that prior to any sale,
      counsel for the Fund shall have delivered to Interneuron its opinion, in
      form and substance acceptable to Interneuron, that the sale will not
      violate any applicable federal or state securities law. If the offered
      Royalty Shares remain unsold at the end of the Sale Period, such Royalty
      Shares may not thereafter be Transferred by the Fund unless the Fund again
      complies with this SECTION 5.2. The failure by Interneuron to exercise its
      Right of First Refusal in any particular instance shall not affect in any
      way such right with respect to any other proposed Transfer of Royalty
      Shares.

5.3   RULE 144 RESTRICTIONS ON TRANSFER. The Fund agrees that any Royalty Shares
      Transferred by the Fund shall be Transferred in accordance with the volume
      restrictions contained in paragraph (e) of Rule 144 of the Securities Act,
      or any successor rule.


<PAGE>   11
5.4   VOTING RESTRICTIONS.

      (a)   So long as the Fund owns any Royalty Shares, with respect to all
            actions to be taken by Interneuron or its stockholders (whether by
            proxy or consent) on which holders of Common Stock have the right,
            by statute or otherwise, to vote, whether as a separate class or
            together with other classes of Interneuron capital stock (a
            "Stockholder Action"), the Fund hereby agrees and hereby irrevocably
            (i) makes, constitutes and appoints the Trustee (the "Fund Voting
            Designee") to act as the Fund's true and lawful proxy and
            attorney-in-fact in the name and on behalf of the Fund, with full
            power to appoint a substitute or substitutes with respect to any
            Royalty Shares owned by the Fund, and (ii) directs the Fund Voting
            Designee to vote the Royalty Shares owned by it, at the time and
            from time to time, with respect to all Stockholder Actions, in the
            place and stead of the Fund, in the same manner and proportion as
            the holders of outstanding shares of Common Stock, other than the
            Fund, and other securities of Interneuron entitled to vote on a
            Stockholder Action, voting as one class ("Voting Securities") and
            represented in person or by proxy, vote their shares in connection
            with a Stockholder Action. For example, if a particular Stockholder
            Action receives the affirmative vote of holders of sixty percent
            (60%) of the Voting Securities represented in person or by proxy,
            then sixty percent (60%) of the Royalty Shares shall be voted in
            favor of the Stockholder Action. By giving this proxy the Fund
            hereby revokes any other proxy granted by the Fund to vote any of
            the Royalty Shares owned by it. The proxy granted herein shall
            expire when all of the Royalty Shares owned by the Fund have been
            sold.

      (b)   All power and authority hereby conferred is coupled with an interest
            and is irrevocable, shall not be terminated by any act of the Fund
            or by operation of law, by lack of appropriate power or authority,
            or by the occurrence of any other event or events and shall be
            binding upon all beneficiaries, heirs at law, legatees,
            distributees, successors, assigns and legal representatives of the
            Fund. If after the execution of this Royalty Agreement the Fund
            shall cease to have appropriate power or authority, or if any other
            such event or events shall occur, the Fund Voting Designee is
            nevertheless authorized and directed to vote any Royalty Shares
            owned by the Fund in accordance with the terms of this Royalty
            Agreement as if such lack of appropriate power or authority or other
            event or events had not occurred and regardless of notice thereof.

      (c)   The Fund shall perform such further acts and execute such further
            documents as may be required to vest in the Fund Voting Designee the
            sole power to vote any Royalty Shares owned by the Fund as required
            herein.

      (d)   Notwithstanding the terms and conditions set forth in this SECTION
            5.4, the Fund shall not, by virtue hereof, be entitled to any voting
            or other rights as a stockholder of Interneuron unless and until
            such time, if ever, as Interneuron shall issue Royalty Shares to the
            Fund.


<PAGE>   12
                                   ARTICLE VI

             ADJUSTMENT PROVISIONS; MERGER, CONSOLIDATION OR SALE

6.1   ADJUSTMENT TO ROYALTY CONVERSION PRICE. The Royalty Conversion Price in
      effect at any time shall be subject to adjustment from time to time upon
      the happening of certain events as follows:

      In case Interneuron shall (i) declare a dividend or make a distribution on
      its outstanding shares of Common Stock in shares of Common Stock, (ii)
      subdivide or reclassify its outstanding shares of Common Stock into a
      greater number of shares, or (iii) combine or reclassify its outstanding
      shares of Common Stock into a smaller number of shares, the Royalty
      Conversion Price in effect at the time of the record date for such
      dividend or distribution or of the effective date of such subdivision,
      combination or reclassification shall be adjusted so that it shall equal
      the price determined by multiplying the Royalty Conversion Price by a
      fraction, the denominator of which shall be the number of shares of Common
      Stock outstanding after giving effect to such action, and the numerator of
      which shall be the number of shares of Common Stock outstanding
      immediately prior to such action. Such adjustment shall be made
      successively whenever any event listed above shall occur.

6.2   OFFICER'S CERTIFICATE. Whenever the Royalty Conversion Price shall be
      adjusted as required by the provisions of the SECTION 6.1, Interneuron
      shall file in the custody of its Treasurer or an Assistant Treasurer at
      its principal office an officer's certificate showing the adjusted Royalty
      Conversion Price determined as herein provided, setting forth in
      reasonable detail such facts as shall be necessary to show the reason for
      and the manner of computing such adjustment. Each such officer's
      certificate shall be made available at all reasonable times for inspection
      by the Fund, and Interneuron shall, forthwith after each such adjustment,
      mail a copy by certified mail of such certificate to the Fund.

6.3   MERGER, CONSOLIDATION OR SALE. In case Interneuron shall at any time prior
      to the earlier of (a) the Termination Date or (b) the date on which
      Interneuron has made payments to the Fund equal to the Royalty Amount, (i)
      consolidate or merge with or into another corporation (other than a merger
      in which Interneuron is the continuing or surviving corporation); or (ii)
      sell or transfer to another corporation all or substantially all of the
      assets of Interneuron (a "Corporate Transaction") in which holders of
      Common Stock are entitled to receive stock, other securities or property
      in exchange for Common Stock held by them then, in lieu of any further
      Royalty Payments or right to receive Royalty Shares under this Royalty
      Agreement, the Fund shall be entitled to receive upon the later of (a) the
      effectiveness of the Corporate Transaction, or (b) the Final Settlement
      Date, if such date is subsequent to the effectiveness of the Corporate
      Transaction, the kind and amount of shares of stock or other securities or
      property to which a holder of the number of shares of Common Stock which
      the Fund would have been entitled as Royalty Shares pursuant to the terms
      of SECTION 2.3 herein as if the provisions of SECTION 2.3 had been


<PAGE>   13
      applicable at such time, based on the Royalty Balance outstanding
      immediately prior to the effectiveness of such Corporate Transaction or,
      if subsequent to such time, on the Final Settlement Date. If (i) at the
      time of any Corporate Transaction, Interneuron has made payments to the
      Fund equal to the Royalty Amount such that there is no Royalty Balance, or
      (ii) as a result of any Corporate Transaction this SECTION 6.3 becomes
      applicable, then any further obligations of Interneuron pursuant to
      ARTICLE 2 hereunder shall immediately expire and this Royalty Agreement
      shall terminate.


                                  ARTICLE VII

                              TERM AND TERMINATION


7.1   TERM AND TERMINATION. This Royalty Agreement shall be effective as of the
      Effective Date and shall continue in effect for the Royalty Term, unless
      (i) this Royalty Agreement is terminated earlier pursuant to SECTION 2.2
      OR 6.3 above, or (ii) the Settlement Agreement terminates in accordance
      with its terms. In addition, if a Party is in breach of any of the
      material terms or conditions of this Royalty Agreement or the Settlement
      Agreement and such breach is not cured within the period set forth in
      SECTION 8.2 hereof, the non-breaching Party shall have the right to
      terminate this Royalty Agreement. The date on which this Royalty Agreement
      is terminated is the "Termination Date".

7.2   EFFECT OF TERMINATION. Termination of this Royalty Agreement shall not
      relieve the Parties of any obligation accruing prior to such termination.
      In addition to any other provisions of this Royalty Agreement which by
      their terms continue after the Termination Date, (i) the provisions of
      ARTICLE 3 shall survive the termination of this Royalty Agreement and
      shall continue in effect for five (5) years from the Termination Date and
      (ii) the provisions of ARTICLE 5 shall survive the termination of this
      Royalty Agreement (except a termination under SECTION 6.3 hereof) and
      shall continue in effect until all of the Royalty Shares are sold pursuant
      to SECTION 5.2 herein. The termination of this Royalty Agreement shall be
      without prejudice to the rights of any Party against the other accrued or
      accruing under this Royalty Agreement prior to the Termination Date.


                                  ARTICLE VIII

                                  MISCELLANEOUS

8.1   FORCE MAJEURE. Neither Party shall be held liable or responsible to the
      other Party nor be deemed to have defaulted under or breached the Royalty
      Agreement for failure or delay in fulfilling or performing any term of the
      Royalty Agreement during the period of time when such failure or delay is
      caused by or results from causes beyond the reasonable control of the
      affected Party including, but not limited to, fire, flood, embargo, war,
      acts


<PAGE>   14
      of war (whether war be declared or not), insurrection, riot, civil
      commotion, strike, lockout or other labor disturbance, act of God or act,
      omission or delay in acting by the other Party. The affected Party shall
      notify the other Party of such force majeure circumstances as soon as
      reasonably practicable.

8.2   CURE PERIOD FOR BREACH. If a Party is in breach of any material obligation
      hereunder or, to the extent applicable, the Settlement Agreement, it shall
      have thirty (30) days after receipt of notice from the other Party
      requesting cure of the breach, to cure such breach; provided however, that
      if the breach is not capable of being cured within thirty (30) days of
      receipt of such written notice for causes or reasons beyond such Party's
      control, such Party may remain in breach of such obligation so long as it
      has commenced and is taking commercially reasonable actions to cure such
      breach as promptly as practicable.

8.3   SEVERABILITY. In the event that any of the provisions contained in this
      Royalty Agreement are held invalid, illegal or unenforceable in any
      respect, the validity, legality and enforceability of the remaining
      provisions contained herein shall not in any way be affected or impaired
      thereby, unless the absence of the invalidated provision(s) adversely
      affect the substantive rights of the Parties. The Parties shall replace
      the invalid, illegal or unenforceable provision(s) with valid, legal and
      enforceable provision(s) which, insofar as practical, implement the
      purposes of this Royalty Agreement.

8.4   NOTICES. All notices or other communications which are required or
      permitted hereunder shall be in writing and sufficient if delivered
      personally, sent by facsimile (and promptly confirmed by personal
      delivery, registered or certified mail or overnight courier), sent by
      nationally-recognized overnight courier or sent by registered or certified
      mail, postage prepaid, return receipt requested, addressed as follows:

            if to Interneuron to: Interneuron Pharmaceuticals, Inc.
                                  One Ledgemont Center
                                  99 Hayden Avenue, Suite 340
                                  Lexington, MA 02421
                                  Attention:  President
                                  Fax No.:  781-862-3859

            with copies to:       Bachner, Tally, Polevoy  Misher LLP
                                  380 Madison Avenue
                                  18th Floor
                                  New York, NY 10017
                                  Attention:  Jill M. Cohen, Esq.
                                  Fax No.:  212-682-5729

                                       and


<PAGE>   15
                                  Skadden, Arps, Slate, Meagher & Flom LLP
                                  919 Third Avenue, 30-36
                                  New York, NY 10022
                                  Attention: Barbara Wrubel, Esq.
                                  Fax No.: 212-735-3748

            if to the Fund, to:   Plaintiffs' Management Committee
                                  510 Walnut Street, Suite 500
                                  Philadelphia, PA  19106
                                  Attention:  Arnold Levin, Esq.
                                  Fax No.:  215-592-4663

            with a copy to the Trustee, at such address as is provided in
            writing to each Party within thirty (30) days of the Effective Date

      or to such other address as the Party to whom notice is to be given may
      have furnished to the other Parties in writing in accordance herewith. Any
      such communication shall be deemed to have been given when delivered if
      personally delivered or sent by facsimile on a business day, on the
      business day after patch if sent by nationally-recognized overnight
      courier and on the third business day following the date of mailing if
      sent by mail.

8.5   APPLICABLE LAW. The Royalty Agreement shall be governed by and construed
      in accordance with the laws of the State of Delaware and the United States
      without reference to any rules of conflict of laws.

8.6   WAIVER. The waiver by a Party hereto of any right hereunder or the failure
      to perform or of a breach by another Party shall not be deemed a waiver of
      any other right hereunder or of any other breach or failure by said other
      Party whether of a similar nature or other:
      wise.

8.7   COUNTERPARTS. The Royalty Agreement may be executed in two or more
      counterparts, each of which shall be deemed an original, but all of which
      together shall constitute one and the same instrument.


<PAGE>   16
      IN WITNESS WHEREOF, the Parties have executed this Royalty Agreement as of
the date first set forth above.


                                       INTERNEURON PHARMACEUTICALS, INC.


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


                                       PLAINTIFFS' MANAGEMENT COMMITTEE
                                       ON BEHALF OF CLASS REPRESENTATIVE
                                       SHARON WISH AND THE INTERNEURON
                                       CLASS ACTION SETTLEMENT FUND


                                       By:/S/ Arnold Levin
                                          ------------------------------------
                                          Name:

                                       By:/S/ John Cummings
                                          ------------------------------------
                                          Name:

                                       By:/S/ Stanley Chesley
                                          ------------------------------------
                                          Name:


<PAGE>   17


                                   APPENDIX A


                Royalty Agreement (filed as Exhibit 99.3 hereto)
<PAGE>   18
                                   APPENDIX B


           SCHEDULE OF INTERNEURON PHARMACEUTICALS, INC.'S INSURANCE

        Columbia Casualty Co. (CNA)                                
                 Policy No. ADT 1028639694
                 (efeective May 15, 1997 to May 15, 1998)
                 $20 million per occurrence and in the aggregate
        
        Reliance Insurance Co. of Illinois
                 Policy No. NPD 0137779
                 (effective May 15, 1997 to May 15, 1998)
                 $5 million per occurrence and in the aggregate
        
        New Hampshire Insurance Co./ AIG Europe (UK) Ltd.
                 Policy No. 3200810697
                 (effective May 15, 1997 to May 15, 1998)
                 $15 million per occurance and in the aggregate


                                      -1-
<PAGE>   19
                                   APPENDIX C

                       IN THE UNITED STATES DISTRICT COURT
                    FOR THE EASTERN DISTRICT OF PENNSYLVANIA

IN RE: DIET DRUGS (PHENTERMINE,                        :
FENFLURAMINE, DEXFENFLURAMINE)                         :        MDL DOCKET NO.
PRODUCTS LIABILITY LITIGATION                          :        1203
                                                       :
THIS DOCUMENT RELATES TO ALL                           :
CASES                                                  :
SHARON WISH v. INTERNEURON                             :        CIVIL ACTION NO.
PHARMACEUTICALS, INC.                                  :        98-CV-20594
                                                       :

                ORDER CONDITIONALLY CERTIFYING A MANDATORY CLASS,
                PRELIMINARILY APPROVING THE SETTLEMENT AGREEMENT,
                 INSTRUCTING THE PARTIES TO PREPARE NOTICE, AND
              TEMPORARILY STAYING AND ENJOINING PENDING AND FUTURE
              LITIGATION AGAINST INTERNEURON PHARMACEUTICALS, INC.

         The Plaintiffs' Management Committee ("PMC"), on behalf of Plaintiff
Sharon Wish, and Interneuron Pharmaceuticals, Inc. ("Interneuron") have made
application for an Order preliminarily approving the settlement of this action
in accordance with the Agreement of Compromise and Settlement (with attached
Royalty Agreement) dated September __, 1998 (the "Settlement Agreement"), a copy
of which is attached hereto. Having read and considered the Settlement Agreement
and the Memoranda submitted by the parties in support of class certification,
and being satisfied that the proposed Settlement Agreement meets the applicable
criteria for preliminary approval, the Court hereby preliminarily approves the
proposed class action settlement on the terms set forth in the Settlement
Agreement and further orders as follows:

         1. The capitalized terms used in this Order shall have the same meaning
as those in the Settlement Agreement.

         2. The Settlement Class is conditionally certified, and is defined as
follows:


                                       -1-
<PAGE>   20
         The "Class" is a mandatory, non-opt out class under Fed. R. Civ. P.
         23(b)(1)(B) that includes:

         (a)      All persons who obtained Redux(TM) in the United States or its
                  territories and used the product prior to the Notice Date;

         (b)      All persons (except the United States Government) asserting or
                  who may in the future assert standing to sue Interneuron or
                  any Released Party as a result of another person's obtaining
                  Redux(TM) in the United States or its territories and using 
                  the product prior to the Notice Date (including spouses, 
                  children, other family members, heirs, beneficiaries, 
                  executors, administrators, legal representatives, successors, 
                  subrogees or assigns of any person who used Redux(TM));

         (c)      All persons in the United States and its territories who used
                  a Diet Drug other than Redux(TM) prior to the Notice Date and
                  who seek or may in the future seek to hold Interneuron or any
                  Released Party liable on a theory of conspiracy, concert of
                  action, aiding and abetting, negligent undertaking, "Good
                  Samaritan" liability, deceptive trade practices, consumer
                  fraud, unfair business practices or any similar legal theory;

         (d)      All persons in the United States and its territories (except
                  the United States Government) asserting or who may in the
                  future assert standing to sue Interneuron or any Released
                  Party based upon a theory of conspiracy, concert of action,
                  aiding and abetting, negligent undertaking, "Good Samaritan"
                  liability, deceptive trade practices, consumer fraud, unfair
                  business practices or any similar legal theory as a result of
                  another person's use of a Diet Drug other than Redux(TM) prior
                  to the Notice Date, including spouses, children, other family
                  members, heirs, beneficiaries, executors, administrators,
                  legal representatives, successors, subrogees or assigns of any
                  person who used a Diet Drug other than Redux(TM).

         3. Plaintiff Sharon Wish is appointed as the Representative Plaintiff
to represent the Settlement Class. The Plaintiffs' Management Committee is
appointed as Class Counsel.

         4. In light of the foregoing, and after having considered the arguments
and evidence submitted by both parties on Plaintiff's motion for class
certification, the Court finds that:

         (a) The Class is so numerous that joinder of all members is
         impracticable;


                                       -2-
<PAGE>   21
         (b) There are questions of law and fact common to the Class;

         (c) The claims of Plaintiff Sharon Wish are typical of the claims of
         the Class;

         (d) Plaintiff Sharon wish will fairly and adequately protect the
         interests of the Class, and her counsel, the PMC, are free from
         intraclass conflicts and will fairly and adequately represent the
         class;

         (e) The continued prosecution of separate actions by individual Class
         Members would create a risk of adjudications with respect to individual
         Class Members that would, as a practical matter, be dispositive of the
         interests of other Class Members not parties to the adjudications and
         substantially impair their ability to protect their interests.
         Interneuron's financial condition presents a substantial risk that the
         continued defense of Diet Drug Litigation nationwide would deplete the
         company's resources and leave no fund from which plaintiffs could
         recover.

These findings are without prejudice to Interneuron's rights under Federal Rule
of Civil Procedure 23 and the Settlement Agreement if the Settlement is not
finally approved. In particular, these findings in no way suggest that this
action could be certified under Rule 23(1,)(2) or Rule 23(1,)(3).

         5. The Court will hold a formal fairness hearing (the "Fairness
Hearing") to determine whether the Agreement is fair, adequate, and reasonable
and should be finally approved and any other matters deemed appropriate by the
Court. The Fairness Hearing will be held on ________________________, at 10:00
a.m., in Courtroom 17B of the United States District Court for the Eastern
District of Pennsylvania, to determine: (a) whether the Class should be
certified as a class action under Federal Rule of Civil Procedure 23(a) and
23(b)(1)(B); (b) whether the Agreement is fair, reasonable, and adequate and
whether final judgment should be entered dismissing the action on the merits,
with prejudice and without costs; (c) whether


                                       -3-
<PAGE>   22
the Court should enter an order barring and enjoining all claims for
contribution and/or indemnity against Interneuron and/or the Released Parties
arising out of Released Claims; and (d) to consider any other matters deemed
appropriate by the Court.

         6. To maintain orderly proceedings and to afford a reasonable
opportunity to be heard to those who wish it, any Class Member or other
interested party wishing to appear at the Fairness Hearing in person or through
his or her attorney must submit a written request, including a summary of the
issue(s) to be presented at the hearing, postmarked no later than
_________________, and mailed to the address provided in the Notice of
Settlement. This requirement ensures that the parties will have adequate notice
of the issues and arguments to be addressed at the hearing.

         7. Any Class Member or other interested party wishing to submit
comments to support or oppose any aspect of the Agreement may do so in writing,
without the necessity of retaining counsel or making any formal appearance. All
written comments must be postmarked no later than _____________________ and
mailed to the address provided in the Notice of Settlement. Any Class Member or
other interested party who does not make an objection in the manner provided
shall be deemed to have waived such objection and shall be forever foreclosed
from making any objection to the certification of the Class, the fairness,
adequacy or reasonableness of the proposed Settlement Agreement, the entry of
the Final Order and Judgment, and the issuance of a permanent injunction and bar
against all claims for contribution and/or indemnity against Interneuron and/or
the Released Parties arising out of Released Claims.

         8. The parties shall jointly propose a long form and short form of
notice within two weeks of the date of this Order. The Court will then evaluate
the content of the notice to ensure that it comports with the requirements of
due process. Notice of the settlement shall be given in the manner set forth
below. The Court finds that such manner


                                       -4-
<PAGE>   23
of notice meets the requirements of due process and is the best notice
practicable under the circumstances and shall constitute due and sufficient
notice to all persons entitled thereto.

         (a)      As soon as practicable after this Court's approval of the
                  forms of notice, but no later than ________________________,
                  the long form notice shall be sent by First Class mail to all
                  Class Members with currently pending litigation against
                  Interneuron, all parties to such litigation, and all attorneys
                  of record in such litigation. Class Counsel also shall cause
                  the long form notice to be posted by computer on the World
                  Wide Web.

         (b)      As soon as practicable after the Court approves the short form
                  notice and no later than _____________________, Class Counsel
                  shall cause the short form notice to be published on two
                  consecutive Fridays in USA Today, once in Parade Magazine
                  (national edition), and once in TV Guide.

         (c)      The costs of notice shall be paid by the Interneuron Class
                  Action Settlement Fund, as stipulated in section 10.3 of the
                  Settlement Agreement.

         9. Counsel for Interneuron is directed to cooperate with Class Counsel
by providing Class Counsel a list of all parties involved in pending state and
or federal products liability or health-related claims against the company, and
their counsel, together with a computer disk formatted for mailing labels as
soon as practical, but no later than 21 days after this Order.

         10. No later than one month after the Notice Date (as defined in the
Settlement Agreement), Class Counsel shall file with the Court a report
describing their notification efforts, with copies of published notices and
lists of the persons notified by mail attached.

         11. The Settlement Agreement, with appendices thereto, will be made
available for public inspection in the Clerk's office during regular business
hours.


                                       -5-
<PAGE>   24
         12. In necessary aid of the Court's jurisdiction over this limited fund
and to assure the fair and orderly conduct and completion of the settlement
consideration process, the Court is contemplating entry of an Order staying and
enjoining all Class Members, defendants in Diet Drug Litigation, and any other
interested parties from initiating, asserting, prosecuting, or otherwise
litigating any Released Claims, including claims for contribution and indemnity,
against Interneuron or the Released Parties until such time as the Court holds a
fairness hearing and determines whether or not to finally approve the Settlement
Agreement.

         13. The Court will hold a hearing to permit Class Members and any other
interested parties to appear and show cause why the Court should not enter the
stay and injunction contemplated in paragraph 12 of this Order. This hearing
shall be held on ________________________, at 10:00 a.m., in Courtroom 17B of
the United States District Court for the Eastern District of Pennsylvania.

         14. The stay entered by Pretrial Order No. 270 (which related to
federal cases only) shall continue and remain in effect until further Order of
the Court. ORDERED this ____ day of September, 1998.

                                       __________________________________
                                       United States District Court Judge


                                       -6-
<PAGE>   25
                                   APPENDIX D

                       IN THE UNITED STATES DISTRICT COURT
                    FOR THE EASTERN DISTRICT OF PENNSYLVANIA

IN RE: DIET DRUGS (PHENTERMINE,                        :
FENFLURAMINE, DEXFENFLURAMINE)                         :        MDL DOCKET NO.
PRODUCTS LIABILITY LITIGATION                          :        1203
                                                       :
THIS DOCUMENT RELATES TO ALL                           :
CASES                                                  :
                                                       :
SHARON WISH v. INTERNEURON                             :        CIVIL ACTION NO.
PHARMACEUTICALS, INC.                                  :        98-CV-20594
                                                       :

                  CLASS MEMBER RELEASE AND INDEMNITY AGREEMENT


STATE OF ___________________________________________   )
                                                       )  ss.
COUNTY OF __________________________________________   )


         This Release and Indemnity Agreement is being executed in light of the
settlement of class action litigation involving the diet drug Redux(TM), which 
was memorialized in an Agreement of Compromise and Settlement executed September
___, 1998 (the "Settlement Agreement") on behalf of a Class as defined in that
Settlement Agreement. The undersigned Class Member submits to the personal
jurisdiction of the Court in the above-captioned action and hereby ratifies the
acts of the Plaintiffs' Management Committee ("PMC") in entering into the
Settlement Agreement on his or her behalf. The undersigned Class Member also
ratifies the Settlement Agreement as executed by the PMC and agrees to be bound
by its terms and conditions and to perform every requirement necessary to
satisfy the conditions and obligations set forth in the Settlement Agreement and
ordered by the Court supervising the settlement of Diet Drug Litigation against
the Released Parties.

         I,_____________, individually [and as personal


                                       -1-
<PAGE>   26
representative/administrator/executor of the estate of ______________] [and as
the surviving spouse and/or child and/or heir of ___________________][and as the
parent/guardian/next friend of ____________], hereinafter [collectively]
referred to as "Class Member," in consideration of the amounts already
deposited and amounts to be deposited in the future by Interneuron
Pharmaceuticals, Inc. ("Interneuron") into the Interneuron Class Action
Settlement Fund (the "Fund") established in the above-captioned action and
pursuant to the Settlement Agreement, and for other good and valuable
consideration, receipt and sufficiency of which is hereby acknowledged and
confessed, hereby RELEASE, ACQUIT, AND FOREVER DISCHARGE the Released Parties,
as defined below and in the Agreement, from any and all claims that the Class
Member may presently have or in the future may have against the Released
Parties arising out of "Released Claims" as defined below and in the Agreement.

         These "Released Claims" include all claims that have, might have been,
or in the future could be asserted by the Class Member against Interneuron or
any Released Parties arising out of the Class Member's use of Redux(TM), 
including without limitation all claims for damages or remedies of whatever kind
or character, known or unknown, that are now recognized by law or that may be
created or recognized in the future by statute, regulation, judicial decision,
or in any other manner, for actual damages, exemplary and punitive damages,
penalties of any kind, personal injuries or death, mental or physical pain or
suffering, loss of wages, income, earnings, and earning capacity, doctor,
hospital, nursing and drug bills, medical expenses, Derivative Claims, loss of
consortium, companionship, society or affection, damage to familial relations,
loss of enjoyment of life, economic or business losses, disgorgement of profits,
prejudgment and postjudgment interest, medical monitoring or screening,
injunctive or declaratory relief, and any other loss or detriment of any kind.

         These "Released Claims" also include all claims based upon a theory of
conspiracy, concert of action, aiding and abetting, negligent undertaking, "Good
Samaritan"


                                       -2-
<PAGE>   27
liability, deceptive trade practices, consumer fraud, unfair business practices
or any similar legal theory that have, might have been, or in the future could
be asserted by any Class Member against Interneuron or any Released Parties
arising out of the Class Member's use of a Diet Drug other than Redux(TM);
including without limitation all claims for damages or remedies of whatever kind
or character, known or unknown, that are now recognized by law or that may be
created or recognized in the future by statute, regulation, judicial decision,
or in any other manner, for actual damages, exemplary and punitive damages,
penalties of any kind, personal injuries or death, mental or physical pain or
suffering, loss of wages, income, earnings, and earning capacity, doctor,
hospital, nursing and drug bills, medical expenses, Derivative Claims, loss of
consortium, companionship, society or affection, damage to familial relations,
loss of enjoyment of life, economic or business losses, disgorgement of profits,
prejudgment and postjudgment interest, medical monitoring, injunctive or
declaratory relief, and any other loss or detriment of any kind.

         The "Released Parties" include Interneuron, Boehringer Ingelheim
Pharmaceuticals, Inc., their respective parents, subsidiaries, affiliates,
divisions, current and former officers, directors, employees, attorneys, and
agents; and each of their insurers (including Columbia Casualty Co., Reliance
Insurance Company of Illinois, and New Hampshire Insurance Company), but only to
the extent of the insurance set forth in Appendix B to the Settlement Agreement
dated September __, 1998, and only to the extent that the insurer has tendered
its unimpaired policy limits without reservation of rights; provided, however,
that Boehringer Ingelheim Pharmaceuticals, Inc. shall not be a Released Party
for any claim arising from defects in the manufacture or packaging of Redux(TM).

         The "Released Parties" also shall include any and all predecessors
and/or shareholders of Interneuron and/or Boehringer Ingelheim Pharmaceuticals,
Inc.; provided, however, that (i) any predecessor and/or shareholder of
Interneuron and/or Boehringer 

                                       -3-
<PAGE>   28
Pharmaceuticals, Inc. who is or becomes a defendant in Diet Drug Litigation
shall be considered a Released Party pursuant to this paragraph only to the
extent that such entity is sued in its capacity as a predecessor and/or
shareholder of Interneuron and/or Boehringer Pharmaceuticals, Inc. and (ii) no
person or entity described in this paragraph shall be released from any claims
based upon its own independent negligence or culpable conduct.

         The "Released Parties" also include all distributors of Redux(TM),
including wholesale distributors, private label distributors, pharmacists,
retail distributors, physicians, hospitals and clinics, and their respective
predecessors, successors, parents, subsidiaries, affiliates and divisions, and
their respective current and former shareholders, officers, directors,
employees, attorneys, agents, and insurers; provided that (i) such persons and
entities described in this paragraph shall be released only as to Released
Claims as to which such persons would have a contractual, common law, or
statutory right of indemnity against Interneuron, and (ii) no person or entity
described in this paragraph shall be released from claims based, in whole or in
part, upon its own independent negligence or culpable conduct (including without
limitation negligence claims or claims for professional malpractice asserted
against physicians, health care providers, and diet centers).

         The "Released Parties" also shall include any and all successors to
Interneuron and/or Boehringer Ingelheim Pharmaceuticals, Inc.; provided,
however, that (i) any current or future defendant in Diet Drug Litigation who
becomes a successor to Interneuron and/or Boehringer Ingelheim Pharmaceuticals,
Inc. by reason of a merger, acquisition, consolidation or otherwise shall be
considered a Released Party pursuant to this paragraph only to the extent that
such entity is sued in its capacity as a successor of Interneuron and/or
Boehringer Pharmaceuticals, Inc. and (ii) no person or entity described in this
paragraph shall be released from any claims based upon its own independent
negligence or culpable conduct.

         It is explicitly acknowledged that the Released Parties under this
Release and


                                       -4-
<PAGE>   29
Indemnity Agreement do not include American Home Products Corporation, Les
Laboratoires Servier, S.A., or either company's subsidiaries, divisions,
affiliates, and other related entities.

         As part of the consideration for Interneuron's payment of sums into the
Fund, the Class Member expressly warrants and represents to each and all of the
Released Parties that: (1) the Class Member is legally competent to execute this
Release; and (2) the Class Member has not assigned, pledged, sold or otherwise
transferred in any manner whatsoever, either by instrument in writing or
otherwise, any right, title, interest or claim that the Class Member may
currently have or may have in the future (except to counsel, if counsel is
executing this instrument).

         To the extent that the Class Member receives a judgment against any
person in an action arising out of a Released Claim, the Class Member will
reduce and satisfy that judgment by an amount equal to the total amount, if any
that the Class Member has received pursuant to the Settlement Agreement (before
deductions of any amounts for costs and legal fees). The Class Member has agreed
and does hereby INDEMNIFY, DEFEND and HOLD HARMLESS each and all of the Released
Parties -- but only up to the amount the Class Member has received from the Fund
pursuant to the Settlement Agreement (before deductions of any amounts for costs
and legal fees) -- from any and all claims, demands, actions, and causes of
action of whatever nature or character that arise out of or are related to
Released Claims, including all costs, expenses and legal fees in defending same,
that have been or hereafter may be asserted by any person, firm or corporation
claiming by, through or under the Class Member, and from any and all legal
actions, including third-party actions and cross-actions, asserted or brought
against any of the Released Parties by any firm, person or corporation against
whom the Class Member has asserted or brought, or may hereafter assert or bring,
any action, arising out of or in any manner connected with the Released Claims.

         The Class Member acknowledges and understands that attorneys' fees and


                                       -5-
<PAGE>   30
expenses shall be paid from any disbursement the Class Member receives from the
Interneuron Class Action Settlement Fund, and the Class Member authorizes and
agrees to payment of that disbursement. The Class Member also acknowledges and
understands that certain costs and expenses associated with the administration
of the Fund will be paid from the Fund and therefore may reduce the amount of
money available to compensate the Class Member.

         It is intended by the undersigned that this Release shall be complete
and shall not be subject to the claim of mistake of fact or law by the
undersigned, and that it expresses a full and complete settlement of liability
claimed and denied as against each and all of the Released Parties for Released
Claims, and regardless of the adequacy or inadequacies of the consideration,
this Release is intended to avoid litigation and to be final and complete.

         This Release is the result of a compromise of a disputed claim and
shall never at any time for any purpose be considered as an admission of
liability or responsibility of the Released Parties, who continue to deny such
liability and to disclaim such responsibility.

         The Class Member fully understands that the execution of this Release
and Indemnity Agreement does not automatically or immediately entitle the Class
Member to any monies that have been deposited by Interneuron into the Fund. The
Class Member may receive a share of the settlement proceeds deposited into the
Fund by Interneuron. The amount will be paid to the Class Member only upon
approval by the Fund's Claims Administrator. The procedures for registering a
claim with the Claims Administrator and receiving a disbursement from the Fund
will be set by order of the Court. The Class Member expressly acknowledges that
his or her total damages and claims may amount to more than what the Claims
Administrator determines is the Class Member's proportionate share of the Fund.
Also, the Class Member acknowledges that the Released Parties may not ultimately
be paying the total of the Class Member's damages arising out of the Released
Claims.

         The Class Member also expressly agrees and understands that if
subrogation


                                       -6-
<PAGE>   31
claims have been asserted by insurers, employers, health care providers, or the
government against the proportionate share allocated by the Claims Administrator
to the Class Member, the Class Member's proportionate share may be reduced
because of the Class Member's indemnity obligation. In the event this occurs,
the Class Member understands and intends that this Release and Indemnity
Agreement is still valid. The Class Member is also aware of section 6.7 of the
Settlement Agreement, which limits the amount of time in which a subrogation
claim may be asserted.

         The Class Member expressly warrants and represents to the Released
Parties, as part of the consideration for the money paid and to be paid by
Interneuron into the Fund, that before executing this instrument, the
undersigned has conferred with counsel, or declined the opportunity to do so,
and agrees that, in light of the Court's recognition of Interneuron as a limited
fund, the payment of money and other consideration given in exchange for this
Release and Indemnity constitutes a fair and reasonable compromise and
settlement of the Class Member's Released Claims.

         The Class Member hereby declares and represents that the injuries the
Class Member sustained as a result of the use of a Diet Drug and/or the Released
Parties' alleged conduct may be permanent and progressive, and that the Class
Member's damages and losses may not now be fully known and may be more numerous
or more serious than the Class Member now expects. The Class Member represents
that he or she has not been influenced to any extent in making this Release and
Indemnity Agreement by any representations or statements made by the Released
Parties regarding the Class Member's injuries or the legal liability therefor.

         The Class Member acknowledges and states that if this Release and
Indemnity Agreement becomes ineffective as to any Released Party or if the
Settlement Agreement identified above becomes ineffective for any reason
whatsoever, this Release and Indemnity Agreement shall not be affected thereby,
and shall remain in effect as to all other Released


                                       -7-
<PAGE>   32
Parties.

         A copy of the Settlement Agreement identified above has been provided
to the Class Member's counsel and was made available to the Class Member to
review and read, if so requested, before the Class Member signed this Release
and Indemnity Agreement.

            [Where required by state statute, additional disclosures
                         or language may be added here.]

                                      -8-
<PAGE>   33
                       CAUTION: READ BEFORE SIGNING BELOW

I HAVE READ THE FOREGOING RELEASE AND HAD THE OPPORTUNITY TO READ THE SETTLEMENT
AGREEMENT IDENTIFIED ABOVE. I FULLY UNDERSTAND THIS RELEASE. I REALIZE AND
UNDERSTAND THAT THIS RELEASE HAS IMPORTANT LEGAL CONSEQUENCES. I HAVE HAD THE
OPPORTUNITY TO GET A LAWYER'S ADVICE. I UNDERSTAND THAT MY INJURIES MAY BE
PROGRESSIVE AND THAT I MAY BE PRESENTLY UNAWARE OF CLAIMS THAT I MIGHT BE ABLE
TO ASSERT AGAINST THE RELEASED PARTIES IN THE FUTURE. EVEN SO, I INTEND THIS TO
BE A COMPLETE AND UNEQUIVOCAL RELEASE OF ALL CLAIMS THAT I MAY EVER HAVE AGAINST
THE RELEASED PARTIES ARISING OUT OF THE USE OF DIET DRUGS, EVEN THOSE CLAIMS
ABOUT WHICH I PRESENTLY AM UNAWARE.


         EXECUTED in multiple originals on __________________________________.
                                           (date)

                                       ______________________________________
                                       CLASS MEMBER

                                       ______________________________________
                                       Date signed

         BEFORE ME, the undersigned authority, on this day personally appeared
_____________________, known to me to be the person whose name is subscribed to
the foregoing instrument, and acknowledged to me that he/she executed the same
for the purposes and consideration therein expressed.

         GIVEN UNDER MY HAND AND SEAL OF OFFICE on __________________________.
                                                   (date)

                                       ______________________________________
                                       Notary Public in and for
                                       the State of _________________________

                                       ______________________________________
                                       Printed Name of Notary

                                       My Commission Expires:________________


                                       -9-
<PAGE>   34
                                   APPENDIX E

                       IN THE UNITED STATES DISTRICT COURT
                    FOR THE EASTERN DISTRICT OF PENNSYLVANIA

IN RE: DIET DRUGS (PHENTERMINE,                        :
FENFLURAMINE, DEXFENFLURAMINE)                         :        MDL DOCKET NO.
PRODUCTS LIABILITY LITIGATION                          :        1203
                                                       :
THIS DOCUMENT RELATES TO ALL                           :
CASES                                                  :
                                                       :
SHARON WISH v. INTERNEURON                             :        CIVIL ACTION NO.
PHARMACEUTICALS, INC.                                  :        98-CV-20594
                                                       :

                      ORDER ENJOINING DEFENDANT INTERNEURON
                   PHARMACEUTICALS, INC. AND ITS SUBSIDIARIES
                   AND AFFILIATES FROM PARTICIPATING IN FORMAL
                  OR INFORMAL DISCOVERY IN DIET DRUG LITIGATION

         The PMC and Interneuron Pharmaceuticals, Inc. ("Interneuron") have
entered into a Settlement Agreement, dated September __, 1998, to bring about an
end to Interneuron's involvement in Diet Drug Litigation. The Court has
conditionally certified the above-captioned action as a mandatory, limited fund
class action under Federal Rule of Civil Procedure 23(b)(1)(B), preliminarily
approved the settlement, and stayed and enjoined Diet Drug Litigation against
Interneuron. The Court specifically finds that the costs and burdens of
Interneuron's continuing participation in discovery related to Diet Drug
litigation on a nationwide basis present a substantial risk of impairing
Interneuron's ability to meet its financial obligations under the Settlement
Agreement and of thereby significantly prejudicing the recovery rights of all
parties with Redux-related claims against the company.

         Accordingly, this Court hereby preliminarily enjoins and bars
Interneuron, its subsidiaries and affiliates from participating in any
discovery, formal or informal, related to Diet Drug Litigation (as that term is
defined in the Settlement Agreement) in any court, state, federal or foreign,
without the express approval of this Court. Interneuron has acknowledged


                                       -1-
<PAGE>   35
that certain additional discovery, including document discovery and some limited
depositions, may be warranted for the benefit of the parties involved in
continuing Diet Drug Litigation. Conducting such discovery, however, threatens
to seriously deplete the limited available resources from which the class
members must draw any recovery. Therefore, this Court will closely supervise any
additional discovery from Interneuron and allow it only on a tightly coordinated
basis.

         This preliminary injunction is necessary in aid of the Court's
jurisdiction over the limited fund and to assure the fair and orderly conduct
and completion of the settlement consideration process. Accordingly, this
injunction shall remain in effect until the Court has rendered a final decision
on the fairness and adequacy of the settlement, which will occur after the
Fairness Hearing.

         Interneuron is directed to provide a copy of this Order to any parties
and/or courts that should seek to compel its participation in formal or informal
discovery in Diet Drug Litigation. 

SO ORDERED this ____ day of September, 1998.

                                       __________________________________
                                       United States District Court Judge


                                       -2-

<PAGE>   1
                                                                    EXHIBIT 99.4


Contact:
Intercardia:
W. Bennett Love
919-558-1907

Astra Pharmaceuticals:
Gary M. Bruell
610-695-1554

For Immediate Release:

               INTERCARDIA AND ASTRA PHARMACEUTICALS END AGREEMENT
                         FOR COLLABORATION ON BEXTRA(R)

     COMPETING PRODUCT ARISES FROM CORPORATE RESTRUCTURING OF ASTRA MERCK

      Research Triangle Park, N.C., USA, and Wayne, PA. September 30, 1998 --
Intercardia, Inc. (Nasdaq:ITRC) and Astra Pharmaceuticals, L.P. (formerly Astra
Merck, Inc.) announced today termination of an agreement for the U.S.
development and commercialization of BEXTRA(R) (bucindolol HCl), a
cardiovascular drug presently under investigation for the treatment of
congestive heart failure. Due to a non- compete clause in the original agreement
between the two companies, Intercardia will now assume responsibility for the
U.S. development and commercialization for BEXTRA.

      On July 1, 1998, Astra AB and Merck & Co., Inc. signed an agreement to
restructure Astra Merck's business and combine it with Astra's wholly-owned
subsidiary, Astra USA, Inc., in a new limited partnership in which Astra has
management control as the general partner. The new company, Astra
Pharmaceuticals, L.P. now has an expanded product line which includes the
once-daily beta blocker Toprol-XL(R) (metoprolol succinate) which is indicated
for treating hypertension and angina and is also being investigated for
treatment of heart failure. Since metoprolol and bucindolol are both beta
blockers being investigated for heart failure, Astra Pharmaceuticals and
Intercardia agreed to terminate the collaboration in light of a non-compete
clause in their original agreement. Astra will be returning to Intercardia all
rights, material and information relating to bucindolol as well as a termination
fee.
<PAGE>   2
      "Astra Merck has been a good partner and very professional throughout our
relationship. Nevertheless, we believe termination of the BEXTRA Collaboration
presents an unexpected opportunity for Intercardia," stated Clayton I. Duncan,
President and CEO of Intercardia. "We regain the U.S. rights for the product and
also receive a payment to help fund development. BEXTRA is in late-stage Phase
III clinical trials for heart failure, the most common reason for
hospitalization in patients over the age of 65, and as a result has attracted
the interest of other pharmaceutical companies. Regaining the rights to BEXTRA
opens new partnering possibilities."

      BEXTRA (bucindolol HCl) is a non-selective beta-blocker with vasodilating
properties in Phase III clinical development for the treatment of congestive
heart failure. The product is currently being evaluated in the Beta-blocker
Evaluation of Survival Trial (BEST), a NIH/VA sponsored Phase III mortality
study initiated in June 1995. The BEST Study is designed to test the hypothesis
that the addition of the beta-adrenergic blocking agent bucindolol to standard
therapy will reduce mortality in patients with moderate to severe congestive
heart failure. To date, the BEST study has enrolled over 2,500 patients in 90
medical centers throughout the U.S. and Canada.

      Congestive heart failure is a condition in which the heart progressively
loses the ability to pump sufficient quantities of blood to meet the metabolic
needs of the body. It is estimated that 5.0 million people in Europe and 4.7
million people in the United States are afflicted. CHF is the most common reason
for hospitalization in patients over the age of 65 in the U.S. and Europe.

      Intercardia, a majority-owned subsidiary of Interneuron Pharmaceuticals,
Inc. (Nasdaq:IPIC), focuses on drug discovery and clinical drug development. The
Company's strategy is to develop and add value to in-licensed products and
research programs and to enter into collaborations and licensing agreements with
corporate partners for final product development, manufacturing and marketing.
Intercardia and BASF Pharma/Knoll AG of Ludwigshafen, Germany, have an agreement
that provides for sharing development expenses and operating profits for the
commercialization of BEXTRA outside the United States and Japan.


                                       -2-
<PAGE>   3
      Astra Pharmaceuticals, L.P. is responsible for marketing all Astra
prescription products, including gastrointestinal, cardiovascular, respiratory,
pain control medications and several other hospital products. In addition to
Toprol-XL(R), other major products include the anti-secretory agent Prilosec(R)
(omeprazole), the cardiovascular agents Atacand(R) (candesartan cilexetil),
Plendil(R) (felodipine) and Lexxel(R) (enalapril maleate-felodipine ER), the
respiratory agents Pulmicort Turbuhaler(R) (budesonide inhilation powder) and
Rhinocort(R) Nasal Inhaler (budesonide) and the topical anesthetic Xlylocaine(R)
(lidocaine HCl).

      The statements in this press release that are not purely statements of
historical fact are forward-looking statements, and actual results may differ
materially from those anticipated. With respect to Intercardia, important
factors that could cause results to differ include risks associated with funding
of operations, results of the BEST study, product development activities and
regulatory decisions which are described in Intercardia's reports on Form 10-K,
Form 10-Q and Form 8-K filed with the Securities and Exchange Commission.
Readers are cautioned not to place undue reliance on these forward-looking
statements, which speak only as of the date hereof. Intercardia assumes no
obligation to update the information in this release.


                                       -3-


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