Exhibit 99.11

René RICOL	Dominique LEDOUBLE
2 avenue Hoche 75008 Paris	99 boulevard Haussmann 75008 Paris

CONSENT OF MERGER AUDITORS

      We hereby consent to (a) the inclusion of (1) our joint Report on the Merger Consideration and our joint Report on the Value of the Assets Transferred, attached as Annex B and Annex C, respectively, to the Prospectus that forms part of the Registration Statement on Form F-4 of Sanofi-Aventis (formerly known as Sanofi-Synthelabo) (SEC File No. 333-112314), as post-effectively amended (the “Registration Statement”), relating to the Sanofi-Aventis ordinary shares to be issued in connection with the proposed merger of Aventis with and into Sanofi-Aventis and (2) the summaries of such reports under the caption “REPORTS OF THE MERGER AUDITORS” in such Prospectus, and (b) references to ourselves and to the “merger auditors” as they appear throughout such Prospectus.

      By providing our consent, we do not admit that we come within the category of persons whose consent is required under, and we do not admit that we are an “expert” for purposes of, the United States Securities Act of 1933, as amended, or the rules and regulations of the United States Securities and Exchange Commission promulgated thereunder

/s/ RENÉ RICOL	/s/ DOMINIQUE LEDOUBLE
René RICOL	Dominique LEDOUBLE

Paris, France

November 9, 2004