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                UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549

                                     FORM 4

                  STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

    Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934,
       Section 17(a) of the Public Utility Holding Company Act of 1935 or
               Section 30(h) of the Investment Company Act of 1940

|_|  Check this box if no longer subject to Section 16. Form 4 or Form 5
     obligations may continue. See Instruction 1(b).

(Print of Type Responses)
________________________________________________________________________________
1.   Name and Address of Reporting Person*

                            OrbiMed Advisors LLC (1)
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   (Last)                           (First)             (Middle)

                          767 Third Avenue, 30th Floor
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                                    (Street)

                               New York, NY 10017
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   (City)                           (State)              (Zip)


________________________________________________________________________________
2.   Issuer Name and Ticker or Trading Symbol

                      Discovery Laboratories, Inc. (DSCO)
________________________________________________________________________________
3.   I.R.S. Identification Number of Reporting Person, if an entity (voluntary)


________________________________________________________________________________
4.   Statement for Month/Day/Year

                                   9/23/2002
________________________________________________________________________________
5.   If Amendment, Date of Original (Month/Day/Year)


________________________________________________________________________________
6.   Relationship of Reporting Person(s) to Issuer
     (Check all applicable)

     |_|  Director                             |X|  10% Owner
     |_|  Officer (give title below)           |_|  Other (specify below)

     ____________________________________________________________________
________________________________________________________________________________
7.   Individual or Joint/Group Filing (Check Applicable line)

     |_|  Form Filed by One Reporting Person
     |X|  Form Filed by More than One Reporting Person
________________________________________________________________________________

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           Table I -- Non-Derivative Securities Acquired, Disposed of,
                             or Beneficially Owned
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                                                                                                 5.
                                                                                                 Amount of      6.
                                                                 4.                              Securities     Owner-
                                                                 Securities Acquired (A) or      Beneficially   ship
                                       2A.          3.           Disposed of (D)                 Owned          Form:     7.
                            2.         Deemed       Transaction  (Instr. 3, 4 and 5)             Following      Direct    Nature of
                            Trans-     Execution    Code         ------------------------------- Reported       (D) or    Indirect
1.                          action     Date, if     (Instr. 8)                   (A)             Transaction(s) Indirect  Beneficial
Title of Security           Date       any          ------------                 or              (Instr. 3 &    (I)       Ownership
(Instr. 3)                  (mm/dd/yy) (mm/dd/yy)    Code     V      Amount      (D)    Price     Instr.4)      (Instr.4) (Instr.4)
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Common Stock                September                S               162,973     (D)    1.495    3,247,992 (2)  I (2)
                            23, 2002                                     (2)
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FORM 4 (continued) Table II -- Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities) ================================================================================ 9. Number 10. of Owner- deriv- ship ative Form 2. Secur- of Conver- 5. 7. ities Deriv- 11. sion Number of Title and Amount Bene- ative Nature or Derivative 6. of Underlying 8. ficially Secur- of Exer- 3A. 4. Securities Date Securities Price Owned ity: In- cise Deemed Trans- Acquired (A) Exercisable and (Instr. 3 and 4) of Follow- Direct direct Price 3. Execut- action or Disposed Expiration Date ---------------- Deriv- ing (D) or Bene- 1. of Trans- ion Code of(D) (Month/Day/Year) Amount ative Reported In- ficial Title of Deriv- action Date if (Instr. (Instr. 3, ---------------- or Secur- Trans- direct Owner- Derivative ative Date any 8) 4 and 5) Date Expira- Number ity action(s) (I) ship Security Secur- (mm/dd/ (mm/dd/ ------ ------------ Exer- tion of (Instr. (Instr. (Instr. (Instr. (Instr. 3) ity yy) yy) Code V (A) (D) cisable Date Title Shares 5) 4) 4) 4) - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ ==================================================================================================================================== Explanation of Responses: (1) Joint filing of OrbiMed Advisors LLC, OrbiMed Advisors Inc. and Samuel D. Isaly (3) of the same address. (2) OrbiMed Advisors LLC and OrbiMed Advisors Inc. have investment management discretion over a number of collective investment funds investing in Discovery Laboratories, Inc. stock. OrbiMed Advisors LLC is recently registered (effective as of April 22, 2002) as an investment adviser under Section 203 of the Investment Advisers Act of 1940 and therefore for the purpose of Rule 16a-1(a)(1) it may no longer be deemed as beneficial owner of securities it holds in the ordinary course of its business and without the purpose of changing or influencing control. OrbiMed Advisors Inc. is also a registered investment adviser under Section 203 of the Investment Advisers Act of 1940. The reporting persons have no beneficial interest in the securities pursuant to Rule 16a-1(2). (3) OrbiMed Advisors Inc. is 100% owned by Samuel D. Isaly who also has a controlling interest in OrbiMed Advisors LLC. /s/ Samuel D. Isaly 9/25/2002 - --------------------------------------------- ----------------------- **Signature of Reporting Person Date Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. * If the form is filed by more than one reporting person, see Instruction 4(b)(v). ** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a). Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure. Page 2