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 August 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.

                           Form 20-F [X]               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 [ ]                            No [X]

     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 post-effectively amended and declared effective on May 13, 2004
by the United States Securities Exchange Commission, and the related prospectus,
dated April 9, 2004, and the  prospectus  supplement,  dated May 27, 2004,  each
filed 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to the extent not  superseded  by  documents  or reports  subsequently  filed or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.




                                                         Paris, August 20, 2004.



                            BIRTH OF SANOFI-AVENTIS,
                     THE WORLD'S 3rd LARGEST PHARMACEUTICAL
                       COMPANY, RANKING NUMBER 1 IN EUROPE



Sanofi-Synthelabo   (PARIS:  SAN,  NYSE:  SNY)  announced  today  the  birth  of
SANOFI-AVENTIS, the world's 3rd largest pharmaceutical company, ranking number 1
in Europe.

Further to the broad success of  Sanofi-Synthelabo's  offer for Aventis,  and as
announced on August 12,  2004,  the  settlement  of the offers  occurred  today,
August 20, 2004.

Hence, Sanofi-Synthelabo controls Aventis with 95.47% of the share capital.

As previously disclosed, Sanofi-Synthelabo hereby officially changes its name to
SANOFI-AVENTIS.


In accordance with article 7 of the COB rule no. 2002-04, this press release 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 and a prospectus  supplement  relating to the revised offer, and will
file  additional  documents  with  the  SEC.  Investors  are  urged  to read the
registration  statement,  including the prospectus and the prospectus supplement
relating to the revised offer,  and any other relevant  documents filed with the
SEC,  including all amendments and supplements,  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  and the  prospectus  supplement  relating  to the
revised  offer  and other  transaction-related  documents  are  being  mailed to
Aventis  security  holders  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 France,  holders of Aventis  securities  are  requested,  with respect to the
offer,   to   refer   to   the   prospectus   supplement   (note   d'information
complementaire),  which has been granted visa number 04-384 by the AMF and 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 the  recommendation  statement
(note d'information en reponse) which has been granted visa number 04-510.

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  subsequent  offering  periods in the
three offers will expire at the same time.

This press  release does not  constitute an offer to purchase or exchange or the
solicitation  of an offer to sell or exchange  any  securities  of Aventis or an
offer to sell or exchange or the solicitation of an offer to buy or exchange any
securities  of  Sanofi-Synthelabo,  nor shall  there be any sale or  exchange of
securities in any jurisdiction  (including the United States, Germany, Italy and
Japan) in which such offer,  solicitation  or sale or exchange would be unlawful
prior to the registration or qualification  under the laws of such jurisdiction.
The distribution of this communication may, in some countries,  be restricted by
law or  regulation.  Accordingly,  persons  who  come  into  possession  of this
document  should  inform  themselves  of and  observe  these  restrictions.  The
solicitation  of  offers to buy  Sanofi-Synthelabo  ordinary  shares  (including
Sanofi-Synthelabo  ordinary shares represented by Sanofi-Synthelabo ADSs) in the
United  States will only be made  pursuant  to a  prospectus  and related  offer
materials  that  Sanofi-Synthelabo   expects  to  send  to  holders  of  Aventis
securities. The Sanofi-Synthelabo  ordinary shares (including  Sanofi-Synthelabo
ordinary shares represented by Sanofi-Synthelabo  ADSs) may not be sold, nor may
offers  to  buy be  accepted,  in the  United  States  prior  to  the  time  the
registration  statement  becomes  effective.  No offering of securities shall be
made  in  the  United  States  except  by  means  of a  prospectus  meeting  the
requirements  of Section  10 of the United  States  Securities  Act of 1933,  as
amended.

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 and may obtain the Reference Document filed with the
AMF on April 2, 2004 (No.  04-0391)  and other  documents  filed with the AMF at
www.amf-france.org.   Free   copies   may  also  be   obtained   directly   from
Sanofi-Synthelabo on our web site at: www.sanofi-synthelabo.com.





                                   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: August 20, 2004                    SANOFI-SYNTHELABO


                                          By:       /s/ Marie-Helene Laimay
                                              ----------------------------------
                                              Name:    Marie-Helene Laimay
                                              Title:   Senior Vice President and
                                                       Chief Financial Officer