Exhibit 21.1

Subsidiaries

	State or Other Jurisdiction of
Name of Subsidiary	Incorporation or Organization
Idenix (Massachusetts) Inc.	Massachusetts
Idenix Pharmaceuticals S.r.l.*	Italy
Idenix (UK) Limited	United Kingdom
Idenix GmbH	Germany
Idenix (Cayman) Limited	Cayman Islands
Idenix SARL**	France
Idenix B.V.**	Netherlands
Idenix Securities Corporation	Massachusetts

* Wholly-owned by Idenix SARL

** Wholly-owned by Idenix (Cayman) Limited