UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                               ------------------
                                    FORM 6-K

                        REPORT OF FOREIGN PRIVATE ISSUER
                        PURSUANT TO RULE 13a-16 OR 15d-16
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               ------------------
                            For the month of May 2004

                        Commission File Number: 001-31368

                                SANOFI-SYNTHELABO
                 (Translation of registrant's name into English)

                   174, avenue de France, 75013 Paris, FRANCE
                    (Address of principal executive offices)

         Indicate by check mark whether the registrant files or will file annual
reports under cover Form 20-F or Form 40-F.

                   [X]    Form 20-F            [ ]   Form 40-F

         Indicate by check mark if the registrant is submitting the Form 6-K in
paper as permitted by Regulation S-T Rule 101(b)(1):_______

         Indicate by check mark if the registrant is submitting the Form 6-K in
paper as permitted by Regulation S-T Rule 101(b)(7):_______

         Indicate by check mark whether the registrant by furnishing the
information contained in this Form is also thereby furnishing the information to
the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of
1934.

                   [ ]   Yes                   [X]   No

         If "Yes" marked, indicate below the file number assigned to the
registrant in connection with Rule 12g3-2(b):  82-________


         This Report on Form 6-K shall be deemed to be incorporated by reference
into Sanofi-Synthelabo's Registration Statement on Form F-4 (Registration No.
333-112314), as declared effective on April 9, 2004 by the United States
Securities Exchange Commission, and the related prospectus filed on April 12,
2004 pursuant to Rule 424(b) under the United States Securities Act of 1933, as
amended, and shall be part thereof from the date on which this Report is filed,
to the extent not superseded by documents or reports subsequently filed or
furnished.







                                                        [SANOFI-SYNTHELABO LOGO]


[GRAPHIC] INVESTOR RELATIONS                                Paris, May 5th, 2004





                      SANOFI-SYNTHELABO'S OFFER FOR AVENTIS

      REQUEST FOR ADDITIONAL INFORMATION FROM THE FEDERAL TRADE COMMISSION


As previously  disclosed,  Sanofi-Synthelabo  has engaged in a dialogue with the
FTC on its offer for Aventis since  December 2003.  Sanofi-Synthelabo  has fully
cooperated  with  the  FTC's  investigation.  As has been  previously  reported,
Sanofi-Synthelabo   has   agreed   to  divest   Arixtra   and   Fraxiparine   to
GlaxoSmithKline with the condition of the success of the offer to resolve an FTC
concern.

On April 26, 2004,  Sanofi-Synthelabo  announced an increased  offer,  which has
been  recommended by Aventis  Supervisory  Board.  This  increased  offer is not
subject to the  condition  precedent of the  expiration  or  termination  of the
applicable waiting period under the US Hart-Scott-Rodino  Antitrust Improvements
Act.

Sanofi-Synthelabo's  Hart-Scott-Rodino  notification form was filed with the FTC
on April 5, 2004 and the  initial  30-day HSR waiting  period  expires on May 5,
2004. As is standard practice when investigating a friendly  transaction of this
significance,  the FTC has today issued a "second  request" for  information  to
enable it to complete its ongoing investigation of Sanofi-Synthelabo's offer.

Sanofi-Synthelabo  and Aventis will fully cooperate with the FTC's investigation
to resolve all remaining issues as promptly as possible.

Sanofi-Synthelabo does not expect that resolution of the issues being discussed
with the FTC will have any material impact on the business of the future group.

Sanofi-Synthelabo  does not expect the FTC's  issuance of the second  request to
delay or otherwise  affect the  completion  of its  exchange  offer for Aventis,
which is expected to occur on or before the end of the second quarter of 2004.


In  accordance  with article 7 of the COB rule no.  2002-04,  this  document was
transmitted to the Autorite des marches financiers (AMF) before its publication.





IMPORTANT  INFORMATION:  In connection with the proposed acquisition of Aventis,
Sanofi-Synthelabo  has  filed a  registration  statement  on Form F-4  (File no.
333-112314) , including a prospectus/offer to exchange, and will file additional
documents  with the United  States  Securities  and  Exchange  Commission  (SEC)
INVESTORS  ARE  URGED  TO  READ  THE  REGISTRATION   STATEMENT,   INCLUDING  THE
PROSPECTUS/OFFER  TO EXCHANGE,  AND ANY OTHER RELEVANT  DOCUMENTS FILED WITH THE
SEC, INCLUDING ALL AMENDMENTS AND SUPPLEMENTS (INCLUDING ANY SUPPLEMENT RELATING
TO ITS REVISED OFFERS), BECAUSE THEY CONTAIN IMPORTANT INFORMATION.  Free copies
of the registration  statement,  as well as other relevant  documents filed with
the  SEC,  may  be  obtained  at  the  SEC's  web  site  at   www.sec.gov.   The
prospectus/offer to exchange and other  transaction-related  documents are being
mailed to Aventis securityholders  eligible to participate in the U.S. offer and
additional  copies may be obtained for free from MacKenzie  Partners,  Inc., the
information  agent for the U.S. offer, at the following  address:  105,  Madison
Avenue,  New York, New York 10016;  telephone 1-(212) 929-5500 (call collect) or
1-(800)  322-2885  (toll-free  call);  e-mail  proxy@mackenziepartners.com.   In
connection  with its revised  offer,  Sanofi-Synthelabo  intends to distribute a
supplement to the prospectus/offer to exchange as soon as practicable.

In France,  holders of Aventis  securities  are  requested,  with respect to the
offer, to refer to the prospectus (note  d'information),  which has been granted
visa number  04-0090 by the AMFand  which is available on the website of the AMF
(WWW.AMF-FRANCE.ORG)  and without cost from:  BNP Paribas  Securities  Services,
GIS-Emetteurs,  Service Logistique, Les Collines de l'Arche, 75450 Paris Cedex 9
and to all other appropriate  documents  relating to the French offer filed with
the AMF.

The public offer to holders of Aventis  ordinary  shares located in Germany (the
"German  Offer")  is being made in  accordance  with  applicable  German law and
pursuant  to an offer  document/sales  prospectus,  which is  available  free of
charge at BNP Paribas Securities Services, Gruneburgweg 14, D-60322 Frankfurt am
Main   (Fax:   069  -  152  05  277)  and  on  the   website   of  the   Company
(WWW.SANOFI-SYNTHELABO.COM).  Any decision to tender Aventis  ordinary shares in
exchange for  Sanofi-Synthelabo  ordinary  shares under the German Offer must be
taken  exclusively  with regard to the terms and conditions of the German Offer,
as well as with regard to the information  included in the offer  document/sales
prospectus, including any amendments thereto, issued in Germany.

The  French  Offer,  the U.S.  Offer and the  German  Offer  are  being  made on
substantially  the same terms and  completion  of these offers is subject to the
same  conditions.  It is intended  that the three offers will expire at the same
time.

Investors  and  security  holders  may obtain a free copy of the Form 20-F filed
with the SEC on April 2, 2004 and any other documents filed by Sanofi-Synthelabo
with the SEC at WWW.SEC.GOV as well as of the Reference  Document filed with the
AMF on April 2, 2004 (No. 04-0391) at  WWW.AMF-FRANCE.ORG or directly from
Sanofi-Synthelabo on our web site at: WWW.SANOFI-SYNTHELABO.COM.




INVESTOR RELATIONS DEPARTMENT
Philippe Goupit         Director of Investor Relations
Arnaud Delepine         Investor Relations Europe
Sanjay Gupta            Investor Relations US
Anne d'Halluin-Sulzer   Investor Relations


CONTACTS:
E-mail:  investor-relations@sanofi-synthelabo.com
Europe                              US
Tel:      + 33 1 53 77 45 45        Tel:      +1 212 551 42 93
Fax:      + 33 1 53 77 42 96        Fax:      +1 212 551 49 92





                                   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, thereunto duly authorized.


Dated: May 5, 2004                       SANOFI-SYNTHELABO


                                         By:         /S/ MARIE-HELENE LAIMAY
                                            ------------------------------------
                                            Name:    Marie-Helene Laimay
                                            Title:   Senior Vice President and
                                                     Chief Financial Officer