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: December 23, 2004


         On  December  23,  2004,  Sanofi-Aventis  issued  the  following  press
release.

         In  connection  with  the  proposed  merger  of  Aventis  with and into
Sanofi-Aventis,  Sanofi-Aventis  has  filed a  post-effective  amendment  to its
registration  statement  on Form F-4 (File no.  333-112314),  which  includes  a
definitive  prospectus  relating  to the  Sanofi-Aventis  shares to be issued to
Aventis  shareholders  resident  in the U.S.  in  connection  with the  proposed
merger,  and may file additional  documents with the SEC. Investors are urged to
read the registration  statement,  including the definitive prospectus,  and any
other  relevant  documents  filed with the SEC,  including  all  amendments  and
supplements, because they will 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 relating to
the  Sanofi-Aventis  shares to be issued to Aventis  shareholders  in connection
with the proposed merger has been mailed to Aventis security holders resident in
the U.S. and additional copies may be obtained for free from MacKenzie Partners,
Inc., the U.S. information agent for the merger, 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 LOGO]



         APPROVAL OF THE MERGER OF AVENTIS WITH AND INTO SANOFI-AVENTIS


Sanofi-aventis announces that on December 23, 2004, the extraordinary general
meeting of its shareholders approved all resolutions relating to the proposed
merger of Aventis with and into sanofi-aventis, including the exchange ratio of
27 sanofi-aventis shares for 23 Aventis shares.

The Aventis shareholders having approved all the resolutions relating to this 
merger on December 13, 2004, all of the conditions precedent provided in the 
merger agreement have been satisfied, and the merger will take effect on 
December 31, 2004.

The merger, which is intended to help align the legal structure of the group
with its operating structure, is a logical follow-on to Sanofi-Synthelabo's
public offer for Aventis and represents an important step for the group.


IMPORTANT INFORMATION.
In connection with the merger of Aventis with and into Sanofi-Aventis,
Sanofi-Aventis has filed a post-effective amendment to its registration
statement on Form F-4 (File no. 333-112314), which includes a definitive
prospectus relating to the Sanofi-Aventis shares to be issued to Aventis
shareholders resident in the U.S. in connection with the proposed merger, and
may file additional documents with the SEC. Investors are urged to read the
registration statement, including the definitive prospectus, and any other
relevant documents filed with the SEC, including all amendments and supplements,
because they will 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 relating to the
Sanofi-Aventis shares to be issued to Aventis shareholders in connection with
the proposed merger has been mailed to Aventis security holders resident in the
U.S. and additional copies may be obtained for free from MacKenzie Partners,
Inc., the U.S. information agent for the merger, 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 and Aventis have prepared a prospectus (SCHEMA E) registered with
the French AUTORITE DES MARCHES FINANCIERS (AMF) under reference number E.04-200
on November 9, 2004, which constitutes an annex to the reports of the board of
directors of sanofi-aventis and of the management board of Aventis presented to
the general meetings of the shareholders of sanofi-aventis and Aventis that will
vote on the merger of Aventis with and into sanofi-aventis. This prospectus
contains information on the merger and its consequences and contemplates the
subsequent listing on the Premier marche of Euronext Paris of the shares to be
issued in connection with the merger. It is strongly recommended that
shareholders and investors read this prospectus which is available at the
registered offices of sanofi-aventis and Aventis as well as on the internet
websites of sanofi-aventis (www.sanofi-aventis.com) and the AMF
(www.amf-france.org). A copy of the prospectus may also be obtained free of
charge by mail from BNP Paribas Securities Services, GIS Emetteurs, Service
assemblees, Immeuble Tolbiac, 75450 Paris Cedex 09. Investors and shareholders
may also obtain any other document filed or registered by sanofi-aventis or
Aventis, respectively, free of charge from the AMF at its website
(www.amf-france.org) or directly from sanofi-aventis or Aventis, as the case may
be, at the internet websites of www.sanofi-aventis.com and www.Aventis.com,
respectively


                         Investor Relations Department
          Europe Tel: + 33 1 53 77 45 45       US Tel: + 1 212 551 40 18
                         E-mail : IR@sanofi-aventis.com