-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 BzoX38zMkMuT+hge42J/HByPiTWzOi9GbzyQqnsWFJ8kiG/+Irie8uI1qPMXALF7
 an9LyxQx3YPtor8QJhJjIw==

<SEC-DOCUMENT>9999999995-09-001668.txt : 20090616
<SEC-HEADER>9999999995-09-001668.hdr.sgml : 20090616
<ACCEPTANCE-DATETIME>20090616001514
ACCESSION NUMBER:		9999999995-09-001668
CONFORMED SUBMISSION TYPE:	EFFECT
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20090615
DATE AS OF CHANGE:		20090616
EFFECTIVENESS DATE:		20090615

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			IDENIX PHARMACEUTICALS INC
		CENTRAL INDEX KEY:			0001093649
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				450478605

	FILING VALUES:
		FORM TYPE:		EFFECT
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-159716
		FILM NUMBER:		09893119

	BUSINESS ADDRESS:	
		STREET 1:		60 HAMPSHIRE STREET
		STREET 2:		.
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02139
		BUSINESS PHONE:		(617) 995-9800

	MAIL ADDRESS:	
		STREET 1:		60 HAMPSHIRE STREET
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02139

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	NOVIRIO PHARMACEUTICALS LTD
		DATE OF NAME CHANGE:	19990820
</SEC-HEADER>
<DOCUMENT>
<TYPE>EFFECT
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0101</schemaVersion>

    <submissionType>EFFECT</submissionType>

    <act>33</act>

    <testOrLive>LIVE</testOrLive>

    <effectiveData>
        <finalEffectivenessDispDate>2009-06-15</finalEffectivenessDispDate>
        <finalEffectivenessDispTime>16:00:00</finalEffectivenessDispTime>
        <form>S-3</form>
        <filer>
            <cik>0001093649</cik>
            <entityName>IDENIX PHARMACEUTICALS INC</entityName>
            <fileNumber>333-159716</fileNumber>
        </filer>
    </effectiveData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----