Filed by Sanofi-Synthelabo
                                  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: June 24, 2004


         On June 24, 2004, Sanofi-Synthelabo issued the following press release.

         In   connection    with   the   proposed    acquisition   of   Aventis,
Sanofi-Synthelabo  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-Synthelabo
ordinary shares  (including  Sanofi-Synthelabo  ordinary  shares  represented by
Sanofi-Synthelabo  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-SYNTHELABO LOGO]

[GRAPHIC] INVESTOR RELATIONS

                                                            Paris, June 24, 2004


                             ANNUAL GENERAL MEETING


The Combined General Meeting of Sanofi-Synthelabo  shareholders was held on June
23, 2004.

The  General  Meeting  approved  the  financial  statements  for the year  ended
December  31,  2003.  Net profit  attributable  to the Group  increased by 17.7%
before exceptional items and goodwill amortization,  to 2,069 million euros, and
earnings per share before exceptional items and goodwill amortization  increased
by 21.5% to 2.94 euros.  Net profit  attributable to the Group increased by 18%,
to 2,076 million euros.

Also approved was the  distribution  of a net dividend of 1.02 euro per share, a
21% increase over the previous year. Due to the current public offer for Aventis
and taking into account the payment of the interim  dividend of 0.97 euro on May
5,  2004,  the  balance  of 0.05  euro  will be paid in the days  following  the
settlement  of the  offers  (or,  if the offers are  reopened  for a  subsequent
offering period, on settlement of the reopened offers).

The  General  Meeting has  resolved,  subject to the  successful  outcome of the
public offer for Aventis, to increase the company's share capital by issuing the
new shares to be allotted to Aventis shareholders who have tendered their shares
in the offers for  Aventis  shares in  France,  Germany or the United  States of
America.  The shares thereby  issued will have identical  rights to the existing
shares  and will  entitle  the  holder to the  annual  dividend  of 1.02 euro in
respect  of  Sanofi-Synthelabo's  2003  results,  which will be paid in the days
following  the  settlement  of the offers (or, if the offers are  reopened for a
subsequent offering period, on settlement of the reopened offers).

The  General   Meeting   has   resolved  to  change  the  name  of  the  company
Sanofi-Synthelabo to "Sanofi-Aventis", subject to the condition precedent of the
completion  of the  settlement  of the offers for Aventis,  and with effect from
that date.

The General Meeting has reappointed Mrs Jean-Francois Dehecq, Rene Barbier de la
Serre,  Robert  Castaigne,  Thierry  Desmarest,  Lindsay  Owen-Jones  and  Bruno
Weymuller,  as members of the Board of  Directors  to serve for a period of four
years  expiring at the end of the General  Meeting held to approve the financial
statements for the year ending December 31, 2007.

The  General  Meeting  has  confirmed  Lord  Douro as a member  of the  Board of
Directors. His term of office will expire at the end of the General Meeting held
to approve the financial statements for the year ending December 31, 2005.




The General Meeting has confirmed  Gerard Van Kemmel as a member of the Board of
Directors. His term of office will expire at the end of the General Meeting held
to approve the financial statements for the year ending December 31, 2006.

The General Meeting has appointed Mr Christian  Mulliez as a member of the Board
of  Directors  to serve for a period of four  years  expiring  at the end of the
General  Meeting held to approve the  financial  statements  for the year ending
December 31, 2007.

The General Meeting has appointed Mrs Jean-Marc Bruel, Jurgen Dormann, Jean-Rene
Fourtou, Serge Kampf, Igor Landau, Hubert Markl, Klaus Pohle, Hermann Scholl, as
members of the Board of  Directors,  subject to the  condition  precedent of the
completion  of the  settlement  of the offers for Aventis,  and with effect from
that  date,  to serve  for a period  of four  years  expiring  at the end of the
General  Meeting held to approve the  financial  statements  for the year ending
December 31, 2007.

The Board of  Directors  of  Sanofi-Synthelabo  in its  meeting  held  after the
General Meeting has reappointed Mr Jean-Francois Dehecq as Chairman and CEO, and
Mr Gerard Le Fur as Senior Executive Vice-President.

During the General Meeting, Marie-Helene Laimay, Senior Vice-President and Chief
Financial Officer, declared:

"Sanofi-Synthelabo's  performance  in the first quarter allows us to confirm our
2004  forecasts:  barring  major  adverse  events and based on the current group
structure, excluding the combination with aventis, Sanofi-Synthelabo expects:

   o     a similar level of consolidated sales growth, on a comparable basis, to
         that achieved in 2003;

   o     at an exchange rate of 1 euro per 1.25 dollar,  an increase in earnings
         per share of around 15%, before  exceptional items and goodwill
         amortization. The sensitivity of this growth rate is 1.2% for a 3 cents
         change in the euro/dollar exchange rate."

In addition, Chairman and CEO Jean-Francois Dehecq declared :

"The  proposed  combination  with  Aventis is an ambitious  project,  which will
position  your  group  as  one  of the  top 3 in  the  pharmaceuticals  industry
worldwide.

Sanofi-Synthelabo and Aventis will combine their strengths, talents and heritage
in Sanofi-Aventis,  which will become the no. 1  pharmaceuticals  group in
Europe and the no. 3 in the world.

Sanofi-Aventis  will have one of the best portfolios of products in research and
development in the pharmaceuticals  industry,  in major therapeutic areas. These
areas include disorders of the central nervous system,  cancer,  thrombo-embolic
diseases,  management of diabetes and  metabolic  disorders,  and vaccines.  The
annual budget that will be devoted to research and development  will allow us to
accelerate the development of the most promising drugs from both groups.

The  existing  presence  of the  two  groups  throughout  the  world  will  give
Sanofi-Aventis a strong base in all major markets  especially in Europe,  in the
United  States and in Japan.  It will allow  sustaining  a robust  growth of the
activity.

This  project  is based on a  strategy  of strong,  sustainable  and  profitable
growth.  It should be  earnings-accretive  from year one after  eliminating  the
accounting  adjustments associated with the deal. It should create value for all
shareholders".



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.

This  press  release  contains  projections  and other  statements  that are not
historical facts, which are subject to various risks and uncertainties  (many of
which  are   difficult   to  predict  and   generally   beyond  the  control  of
Sanofi-Synthelabo)  that could cause actual results and  developments  to differ
materially  from  those  expressed,  or implied or  projected.  These  risks and
uncertainties  include  those  discussed in our filings  with the United  States
Securities and Exchange  Commission (SEC) and the AMF. Other than as required by
applicable  law,  Sanofi-Synthelabo  does not undertake any obligation to update
any statement that is not a historical fact.

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 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 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.


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 40 18
Fax:  + 33 1 53 77 42 96     Fax:    + 1 646 487 40 18