BIOTECHNOLOGY VALUE FUND L P ET AL
SC 13D, 1998-09-09
INVESTMENT ADVICE
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                          SECURITIES AND EXCHANGE COMMISSION
                                WASHINGTON, DC  20549

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

                                     SCHEDULE 13D
                                    (RULE 13d-101)

               INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
              TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO
                                    RULE 13d-2(a)

                               (AMENDMENT NO. _____)(1)
                              SIBIA NEUROSCIENCES, INC.
                              -------------------------
                                   (Name of Issuer)

                                     COMMON STOCK
                             ---------------------------
                            (Title of Class of Securities)

                                     825732 10 0
                                    --------------
                                    (CUSIP Number)

                                   Marc Schneidman
                                  BVF Partners L.P.
                          333 West Wacker Drive, Suite 1600
                               Chicago, Illinois  60606
                                    (415) 288-2396               
                     --------------------------------------------
                    (Name, Address and Telephone Number of Person
                  Authorized to Receive Notices and Communications)

                                  SEPTEMBER 8, 1998
                                ----------------------
               (Date of Event which Requires Filing of this Statement)

     If the filing person has previously filed a statement on Schedule 13G to
report the acquisition which is the subject of this Schedule 13D, and is filing
this schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the
following box / /.

          NOTE: Six copies of this statement, including all exhibits, should be
     filed with the Commission.  SEE Rule 13d-1(a) for other parties to whom
     copies are to be sent.

                            (Continued on following pages)

                                 (Page 1 of 8 Pages)



(1)  The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter disclosures provided in a prior cover page.

     The information required on the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, SEE the
NOTES).


<PAGE>

- --------------------------                   --------------------------
CUSIP NO. 825732 10 0              13D          Page 2 OF 8 Pages 
- --------------------------                   --------------------------

- -------------------------------------------------------------------------------
    1    NAME OF REPORTING PERSONS
         S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS
              BIOTECHNOLOGY VALUE FUND, L.P.
- -------------------------------------------------------------------------------
    2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                               (a) /X/  (b) / /
- -------------------------------------------------------------------------------
    3    SEC USE ONLY

- -------------------------------------------------------------------------------
    4    SOURCE OF FUNDS*
              WC
- -------------------------------------------------------------------------------
    5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS
         REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)                            / /
- -------------------------------------------------------------------------------
    6    CITIZENSHIP OR PLACE OF ORGANIZATION
              DELAWARE
- -------------------------------------------------------------------------------
              NUMBER                7   SOLE VOTING POWER
                OF                           -0-
              SHARES                -------------------------------------------
           BENEFICIALLY             8   SHARED VOTING POWER
             OWNED BY                        495,500
            REPORTING               -------------------------------------------
              PERSON                9   SOLE DISPOSITIVE POWER
               WITH                          -0-
                                    -------------------------------------------
                                   10   SHARED DISPOSITIVE POWER
                                             495,500
- -------------------------------------------------------------------------------
   11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
         REPORTING PERSON
              495,500
- -------------------------------------------------------------------------------
   12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES
         CERTAIN SHARES*                                                    / /
- -------------------------------------------------------------------------------
   13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
              5.2%
- -------------------------------------------------------------------------------
   14    TYPE OF REPORTING PERSON*
              PN
- -------------------------------------------------------------------------------

                     * SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>

- --------------------------                   --------------------------
CUSIP NO. 825732 10 0              13D          Page 3 of 8 Pages 
- --------------------------                   --------------------------

- -------------------------------------------------------------------------------
    1    NAME OF REPORTING PERSONS
         S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS
              BVF PARTNERS L.P.
- -------------------------------------------------------------------------------
    2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                              (a) /X/  (b)  / /
- -------------------------------------------------------------------------------
    3    SEC USE ONLY

- -------------------------------------------------------------------------------
    4    SOURCE OF FUNDS*
              OO
- -------------------------------------------------------------------------------
    5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS
         REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)                            / /
- -------------------------------------------------------------------------------
    6    CITIZENSHIP OR PLACE OF ORGANIZATION
              DELAWARE
- -------------------------------------------------------------------------------
              NUMBER                7   SOLE VOTING POWER
                OF                           -0-
              SHARES                -------------------------------------------
           BENEFICIALLY             8   SHARED VOTING POWER
             OWNED BY                        1,042,600
            REPORTING               -------------------------------------------
              PERSON                9   SOLE DISPOSITIVE POWER
               WITH                          -0-
                                    -------------------------------------------
                                   10   SHARED DISPOSITIVE POWER
                                             1,042,600
- -------------------------------------------------------------------------------
   11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
         REPORTING PERSON
              1,042,600
- -------------------------------------------------------------------------------
   12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES
         CERTAIN SHARES*                                                       
- -------------------------------------------------------------------------------
   13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
              11.0%
- -------------------------------------------------------------------------------
   14    TYPE OF REPORTING PERSON*
              PN
- -------------------------------------------------------------------------------

                     * SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>

- --------------------------                   --------------------------
CUSIP NO. 825732 10 0              13D          Page 4 of 8 Pages 
- --------------------------                   --------------------------

- -------------------------------------------------------------------------------
    1    NAME OF REPORTING PERSONS
         S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS
              BVF INC.
- -------------------------------------------------------------------------------
    2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                              (a) / /  (b)  / /
- -------------------------------------------------------------------------------
    3    SEC USE ONLY

- -------------------------------------------------------------------------------
    4    SOURCE OF FUNDS*
              WC, OO
- -------------------------------------------------------------------------------
    5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS
         REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)                            / /

- -------------------------------------------------------------------------------
    6    CITIZENSHIP OR PLACE OF ORGANIZATION
              DELAWARE
- -------------------------------------------------------------------------------
              NUMBER                7   SOLE VOTING POWER
                OF                           -0-
              SHARES                -------------------------------------------
           BENEFICIALLY             8   SHARED VOTING POWER
             OWNED BY                        1,042,600
            REPORTING               -------------------------------------------
              PERSON                9   SOLE DISPOSITIVE POWER
               WITH                          -0-
                                    -------------------------------------------
                                   10   SHARED DISPOSITIVE POWER
                                             1,042,600
- -------------------------------------------------------------------------------
   11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
         REPORTING PERSON
              1,042,600
- -------------------------------------------------------------------------------
   12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES
         CERTAIN SHARES*                                                    / /
- -------------------------------------------------------------------------------
   13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
              11.0%
- -------------------------------------------------------------------------------
   14    TYPE OF REPORTING PERSON*
              IA, CO
- -------------------------------------------------------------------------------

                        * SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>

- --------------------------                   --------------------------
CUSIP NO. 825732 10 0              13D          Page 5 of 8 Pages 
- --------------------------                   --------------------------

ITEM 1.   SECURITY AND ISSUER.

     This Statement on Schedule 13D (this "Statement") relates to the Common
Stock, par value $.001 per share (the "Stock"), of Sibia Neurosciences, Inc., a
Delaware corporation ("Sibia").  The principal executive office of Sibia is
located at 505 Coast Boulevard South, Suite 300, La Jolla, California 92037.

ITEM 2.   IDENTITY AND BACKGROUND.

     The persons filing this Statement, the persons enumerated in Instruction C
of Schedule 13D and, where applicable, their respective places of organization,
general partners, directors, executive officers and controlling persons, and
certain information regarding each of them, are as follows:

     (a)  Biotechnology Value Fund, L.P., a Delaware limited partnership
("BVF"), BVF Partners L.P., a Delaware limited partnership ("Partners"), BVF
Inc., a Delaware corporation ("BVF Inc."), and Mark N. Lampert, an individual
("Lampert") (collectively, the "Reporting Persons").

     (b)  The business address of BVF and Partners is 333 West Wacker Drive,
Suite 1600, Chicago, Illinois 60606.  The business address of BVF Inc. and
Lampert is One Sansome Street, 39th Floor, San Francisco, California 94104.

     (c)  Partners is the general partner of BVF, which is an investment limited
partnership.  BVF Inc. is an investment adviser to and general partner of
Partners.  Lampert is the sole shareholder, sole director and an officer of BVF
Inc.

     (d)  During the last five years, none of such persons has been convicted in
a criminal proceeding (excluding traffic violations and similar misdemeanors).

     (e)  During the last five years, none of such persons was a party to a
civil proceeding of a judicial or administrative body of competent jurisdiction
and as a result of such proceeding was or is subject to a judgment, decree or
final order enjoining future violations of, or prohibiting or mandating
activities subject to, federal or state securities laws or finding any violation
with respect to such laws.

     (f)  Lampert is a citizen of the United States of America.


<PAGE>

- --------------------------                   --------------------------
CUSIP NO. 825732 10 0              13D          Page 6 of 8 Pages 
- --------------------------                   --------------------------

ITEM 3.   SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

     Since July 6, 1998, Partners, in its capacity as general partner of BVF,
has purchased on behalf of such limited partnership an aggregate number of
20,000 shares of the Stock for an aggregate consideration of $63,178.00,
utilizing funds provided by BVF from its working capital pursuant to the terms
of its limited partnership agreement with Partners.  In addition, Partners, in
its capacity as investment manager with respect to certain managed accounts, has
purchased on behalf of such managed accounts an aggregate number of 26,600
shares of the Stock for an aggregate consideration of $83,504.50, utilizing
funds under management by Partners pursuant to investment manager agreements
between Partners and such managed accounts.
     
ITEM 4.   PURPOSE OF TRANSACTIONS.

     The external environment for small, quality biotechnology companies is
undergoing a period of rapid and profound change.  The convergence of a
depressed equity market, the possible slowing pace of a corporate partnering
activity, and escalating cash burn rates could produce an industry shake-out in
which financially conservative companies prosper and financially weak companies
falter.  This changing environment may call for managements and Boards to
husband capital by significantly reducing cash burn rates and to otherwise alter
preconceived business plans.  If managed pro-actively and intelligently, this
period could yield attractive returns for shareholders.  However, the
consequences of complacency and the potential for irreparable missteps are
great.  BVF may seek to work with company managements, Boards and shareholders
to maximize shareholder value and, specifically, to protect the substantial
value of funded, partnered programs from unnecessary dilution.  BVF IS AMENDING
ALL ITS 13-D FILINGS WITH THIS NOTICE.  

ITEM 5.   INTEREST IN SECURITIES OF THE ISSUER.

     (a)  BVF beneficially owns 495,500 shares of the Stock, Partners
beneficially owns 1,042,600 shares of the Stock, and BVF Inc. beneficially owns
1,042,600 shares of the Stock, approximately 5.2%, 11.0% and 11.0%,
respectively, of the aggregate number of shares outstanding as of July 31, 1998
(as reported in Sibia's most recent quarterly statement).

     (b)   BVF shares voting and dispositive power over the 495,500 shares of
the Stock it beneficially owns with Partners.  Partners and BVF Inc. share
voting and dispositive power over the 1,042,600 shares of the Stock they
beneficially own with, in addition to BVF, the managed accounts on whose behalf
Partners, as investment manager, purchased such shares.  The managed accounts on
whose behalf Partners owns shares of the Stock are Investment 10 L.L.C., an
Illinois limited liability company ("ILL10") and Biotechnology Value Fund, Ltd.,
a Cayman Islands Corporation ("BVF Ltd.").  ILL10 and BVF Ltd. are collectively
referred to herein as the "Accounts."  The Accounts specialize in holding
biotechnology stocks for 


<PAGE>

- --------------------------                   --------------------------
CUSIP NO. 825732 10 0              13D          Page 7 of 8 Pages 
- --------------------------                   --------------------------

investment purposes and the business address of each is c/o BVF Partners L.P., 
333 West Wacker Drive, Suite 1600, Chicago, Illinois 60606.

     (c)  Exhibit B attached hereto contains information as to all transactions
in the Stock by the Reporting Persons during the past 60 days.  All such
transactions were made for cash in open market, over-the-counter transactions. 
No other transactions in the Stock have been effected by the Reporting Persons
during the past 60 days.

     (d)  The Accounts are entitled to receive dividends and any sale proceeds
with respect to the Stock in proportion to their respective ownership interests
therein.

ITEM 6.   CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT
          TO SECURITIES OF THE ISSUER.

     Partners is the general partner of BVF pursuant to a limited partnership
agreement which authorizes Partners, among other things, to invest the funds of
BVF in the Stock and to vote and dispose of the Stock.  Pursuant to such limited
partnership agreement, Partners is entitled to allocations based on assets under
management and realized and unrealized gains thereon.  Pursuant to investment
management agreements with the Accounts, Partners and BVF Inc. have the
authority, among other things, to invest funds of the Accounts in the Stock and
to vote and dispose of the Stock.  Pursuant to such agreements, Partners and BVF
Inc. receive fees based on assets under management and realized and unrealized
gains thereon.  BVF Inc. is the general partner of Partners and may be deemed to
own beneficially securities over which Partners exercises voting and dispositive
power.

ITEM 7.   MATERIAL TO BE FILED AS EXHIBITS.

     Exhibit A - Agreement Regarding Joint Filing

     Exhibit B - Transactions in the Stock by the Reporting Persons during the
past 60 days.


<PAGE>

- --------------------------                   --------------------------
CUSIP NO. 825732 10 0              13D          Page 8 of 8 Pages 
- --------------------------                   --------------------------

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

Dated:  September 8, 1998

     BIOTECHNOLOGY VALUE FUND, L.P.

     By:  BVF Partners L.P., its general partner

          By:  BVF Inc., its general partner


               By:    /s/ Mark N. Lampert  
                    -----------------------
                    Mark N. Lampert
                    President

     BVF PARTNERS L.P.

     By:  BVF Inc., its general partner


          By:    /s/ Mark N. Lampert            
               ----------------------------
               Mark N. Lampert
               President

     BVF INC.


     By:    /s/ Mark N. Lampert                      
          ---------------------------
          Mark N. Lampert
          President


<PAGE>

                                                       EXHIBIT A

                           AGREEMENT REGARDING JOINT FILING


     The undersigned, Biotechnology Value Fund, L.P., a Delaware limited
partnership, and BVF Partners L.P., a Delaware limited partnership, and BVF
Inc., a Delaware corporation, hereby agree and acknowledge that the statement
containing the information required by Schedule 13D, to which this Agreement is
attached as an exhibit, is filed on behalf of each of them.  The undersigned
further agree that any amendments or supplements thereto shall also be filed on
behalf of each of them.

Dated:  September 8, 1998

     BIOTECHNOLOGY VALUE FUND, L.P.

     By:  BVF Partners L.P., its general partner

          By:  BVF Inc., its general partner


               By:    /s/ Mark N. Lampert  
                    ----------------------------
                    Mark N. Lampert
                    President

     BVF PARTNERS L.P.

     By:  BVF Inc., its general partner


          By:    /s/ Mark N. Lampert            
               ----------------------------
               Mark N. Lampert
               President

     BVF INC.


     By:    /s/ Mark N. Lampert                      
          ---------------------------------
          Mark N. Lampert
          President


<PAGE>

                                      EXHIBIT B

                 TRANSACTIONS IN THE STOCK BY THE REPORTING PERSONS 
                               DURING THE PAST 60 DAYS

<TABLE>
<CAPTION>
 

- --------------------------------------------------------------------------------------------
 Settlement                For the 
   Date         By        Account of    Quantity    Price per Share  Type of Trade    Broker
- --------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------
<S>          <C>          <C>           <C>         <C>              <C>              <C>
 08/27/98    Partners       BVF           20,000       $3.1389         Purchase        INET
- --------------------------------------------------------------------------------------------
 08/27/98    Partners       BVF Ltd.      25,000       $3.1389         Purchase        INET
- --------------------------------------------------------------------------------------------
 08/31/98    Partners       BVF Ltd.       1,600       $2.8125         Purchase        INET
- --------------------------------------------------------------------------------------------
INET      =    Instinet
 

</TABLE>




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