Achillion to Host Fourth Quarter and Year End Investor Conference Call on March 27, 2007

NEW HAVEN, Conn., March 21 /PRNewswire-FirstCall/ -- Achillion Pharmaceuticals, Inc. expects to release its results for the fourth quarter and year ended December 31, 2006 after the market closes on Tuesday, March 27, 2007.

The company will host a conference call to discuss the results at 4:30 PM ET on March 27. The call may be joined via telephone by dialing [phone] or [phone] (for international participants) at least 5 minutes prior to the start of the call. An audio replay will be available through April 21, 2007 by dialing [phone] or [phone] (international) and using the conference confirmation code 1892814.

A live audio webcast of the call will also be available on the "Investor Relations" section of the company's website, http://www.achillion.com/. An archived audio webcast will be available on the Achillion website approximately two hours after the event and will be archived for three months.

About Achillion

Achillion is a biopharmaceutical company focused on the discovery, development and commercialization of innovative treatments for infectious diseases. Achillion is currently developing treatments for HIV infection, chronic hepatitis C infection and serious hospital-based bacterial infections. For more information on Achillion Pharmaceuticals, please visit the company's web site at http://www.achillion.com/ or call Achillion at 1-203-624-7000. ACHN-G

Contact: Media: Mary Kay Fenton Kari Watson Achillion Pharmaceuticals, Inc. MacDougall Biomedical Communications Tel. [phone] Tel. [phone]