Filed by Sanofi-Aventis
                                  Pursuant to Rule 165 and Rule 425(a) under the
                                           United States Securities Act of 1933,
                                                                      as amended

                                                        Subject Company: Aventis
                                                   Commission File No. 001-10378
                                                         Date: September 7, 2004


     On September 7, 2004, Sanofi-Aventis issued the following press release.

     In connection with its acquisition of Aventis,  Sanofi-Aventis  (previously
known as  Sanofi-Syhthelabo)  has filed with the United  States  Securities  and
Exchange  Commission  (SEC),  a  registration  statement  on Form F-4  (File no:
333-112314), which includes a prospectus and a prospectus supplement relating to
the revised  offer,  and  related  exchange  offer  materials,  to register  the
Sanofi-Aventis   ordinary  shares  (including   Sanofi-Aventis  ordinary  shares
represented  by  Sanofi-Aventis  ADSs) to be  issued  in  exchange  for  Aventis
ordinary  shares  held by holders  located in the United  States and for Aventis
ADSs  held by  holders  wherever  located  and has  also  filed  with  the SEC a
Statement  on  Schedule  TO.  INVESTORS  AND HOLDERS OF AVENTIS  SECURITIES  ARE
STRONGLY  ADVISED TO READ THE  REGISTRATION  STATEMENT  AND THE  PROSPECTUS  AND
PROSPECTUS  SUPPLEMENT  RELATING TO THE REVISED OFFER, THE STATEMENT ON SCHEDULE
TO,  AND ANY  OTHER  RELEVANT  DOCUMENTS  FILED  WITH  THE  SEC,  AS WELL AS ANY
AMENDMENTS AND SUPPLEMENTS BECAUSE THEY CONTAIN IMPORTANT INFORMATION. Investors
and holders of Aventis  securities  may obtain  free copies of the  registration
statement,  the prospectus,  the prospectus  supplement  relating to the revised
offer and related exchange offer materials, and the Statement on Schedule TO, as
well as other  relevant  documents  filed with the SEC, at the SEC's web site at
www.sec.gov.  The prospectus,  the prospectus supplement relating to the revised
offer 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.


                                     * * * *




                                                        [SANOFI-AVENTIS GRAPHIC]


[GRAPHIC] Investor Relations


                        SANOFI-AVENTIS' OFFER FOR AVENTIS
                     SUBSEQUENT OFFERING PERIOD HAS EXPIRED

PARIS,  FRANCE -- SEPTEMBER 7, 2004 --  Sanofi-Aventis  (PARIS:  SAN, NYSE: SNY)
announces that the  subsequent  offering  period in its French,  German and U.S.
Offers for Aventis expired simultaneously yesterday (September 6, 2004) at 23:00
hr  (Central  European  Summer  Time) and 5:00  p.m.  (Eastern  Daylight  Time).
Accordingly,  holders of Aventis  ordinary  shares and ADSs may no longer tender
into the offers and may not withdraw  Aventis ordinary shares and ADSs that have
already been tendered.

Sanofi-Aventis  expects that the French  Autorite des marches  financiers  (AMF)
will publish the  definitive  final results of the offers on September 16, 2004.
Sanofi-Aventis will issue a press release regarding the definitive final results
of the offers promptly after the announcement by the AMF.


In  accordance   with  the   requirements   of  the  New  York  Stock  Exchange,
Sanofi-Aventis  announces  that as of 5:00 p.m. on  September  6, 2004  (Eastern
Daylight Time), a total of approximately 752,392 Aventis ADSs (including 241,429
Aventis ADSs subject to the guaranteed delivery period) had been tendered in and
not withdrawn from the U.S. offer during the subsequent  offering period.  Based
on data provided by Aventis,  these tenders  represent  approximately 25% of the
approximately  2,991,239  Aventis ADSs issued and  outstanding  as of that date.
These  results  are not  final and will be  combined  with the  overall  results
obtained in the French, German and U.S. offers. Because of French centralization
procedures,  the number of Aventis ordinary shares tendered in and not withdrawn
from the offers during their  respective  subsequent  offering periods cannot be
known at this time and will be announced by the AMF as described above.


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 its acquisition of Aventis, Sanofi-Aventis (formerly known as
Sanofi-Synthelabo)  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  were
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-Aventis 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.  The subsequent  offering  periods in each of the three offers
expired 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-Aventis,  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-Aventis   ordinary  shares  (including
Sanofi-Aventis ordinary shares represented by Sanofi-Aventis ADSs) in the United
States will only be made pursuant to a prospectus  and related  offer  materials
that  Sanofi-Aventis  expects  to send to holders  of  Aventis  securities.  The
Sanofi-Aventis   ordinary  shares  (including   Sanofi-Aventis  ordinary  shares
represented  by  Sanofi-Aventis  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.

FORWARD-LOOKING STATEMENTS
--------------------------

This press release  contains  forward-looking  information and statements  about
Sanofi-Aventis,  Aventis and their combined  businesses  after completion of the
acquisition.  Forward-looking  statements are statements that are not historical
facts.  These statements  include financial  projections and estimates and their
underlying assumptions,  statements regarding plans, objectives and expectations
with  respect  to future  operations,  products  and  services,  and  statements
regarding   future   performance.   Forward-looking   statements  are  generally
identified  by  the  words  "expect,"   "anticipates,"   "believes,"  "intends,"
"estimates"  and  similar  expressions.   Although  Sanofi-Aventis'   management
believes that the expectations reflected in such forward-looking  statements are
reasonable,  investors  and holders of Aventis  securities  are  cautioned  that
forward-looking  information  and  statements  are subject to various  risks and
uncertainties,  many of which are difficult to predict and generally  beyond the
control of  Sanofi-Aventis,  that could cause actual results and developments to
differ  materially  from those  expressed  in, or implied or  projected  by, the
forward-looking  information  and  statements.  These  risks  and  uncertainties
include those discussed or identified in the public filings with the SEC and the
AMF made by Sanofi-Aventis and Aventis, including those listed under "Cautionary
Statement  Concerning  Forward-Looking  Statements"  and "Risk  Factors"  in the
prospectus/offer to exchange included in the registration  statement on Form F-4
that Sanofi-Aventis has filed with the SEC (File no: 333-112314).  Other than as
required by applicable law,  Sanofi-Aventis does not undertake any obligation to
update or revise any forward-looking information or statements.

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-Aventis
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-Aventis 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
Loic Gonnet             Investor Relations

CONTACTS:
E-mail : investor-relations@sanofi-synthelabo.com
Europe                          US
Tel: + 33 1 53 77 45 45         Tel.: + 1 212 551 40 18
Fax: + 33 1 53 77 42 96         Fax:  + 1 646 487 40 18