Achillion to Present at Three Upcoming Investor Conferences

Achillion Pharmaceuticals, Inc.

(Nasdaq:ACHN) announced today that members of the senior management team will present a corporate overview at three upcoming investor conferences:

• Deutsche Bank Securities 39th Annual Health Care Conference on Wednesday, May 7, 2014 at 4:10 p.m. ET at the InterContinental Hotel in Boston, MA;
• Bank of America Merrill Lynch 2014 Health Care Conference on Wednesday, May 14, 2014 at 8:40 a.m. PT at the Encore at the Wynn Hotel in Las Vegas, NV; and
• UBS 2014 Global Healthcare Conference on Monday, May 19, 2014 at 8:30 a.m. ET at the Sheraton New York Times Square Hotel in New York, NY.

The live audio and subsequent archived webcasts of the Company's presentations will be accessible from the Company's investor relations website, http://ir.achillion.com. The audio recording will be archived for 30 days following the live presentation. Please connect to Achillion's website several minutes prior to the start of the presentation to ensure adequate time for any software downloads that may be necessary.

About Achillion Pharmaceuticals

Achillion is an innovative pharmaceutical company dedicated to bringing important new treatments to patients with infectious disease. Achillion's discovery, clinical development, and commercial teams have advanced multiple novel product candidates with proven mechanisms of action into studies and toward the market. Achillion is focused on solutions for the most challenging problems in infectious disease including HCV and resistant bacterial infections. For more information on Achillion Pharmaceuticals, please visit www.achillion.com or call 1-203-624-7000.

CONTACT: Company Contact:
         Glenn Schulman
         Achillion Pharmaceuticals, Inc.
         Tel. [phone]
         [e-mail]
         
         Investors:
         Mary Kay Fenton
         Achillion Pharmaceuticals, Inc.
         Tel. [phone]
         [e-mail]