Alexion Pharmaceuticals Inc. Invites You to Participate in its Fourth Quarter and Full Year 2007 Results Conference Call and Web Cast

CHESHIRE, Conn., Jan. 28 /PRNewswire-FirstCall/ -- Alexion Pharmaceuticals, Inc. , today announced that the Company will conduct a conference call and audio web cast on Thursday, February 14, 2008, at 10:00 a.m. Eastern Time (ET), in conjunction with the release of its financial results for the fourth quarter and full year ended December 31, 2007. Alexion anticipates releasing its financial results at 6:30 a.m. ET on Thursday, February 14, 2008.

To participate in this conference call, dial (719) 325-4802 confirmation code 4232989, shortly before 10:00 a.m. ET. A replay of the call will be available from 1:00 p.m. ET through a limited time thereafter. The replay number is 719-457-0820, confirmation code 4232989. The audio web cast can be accessed at: www.alexionpharm.com.

[ALXN-G]

CONTACT: Irving Adler, Sr. Director, Corporate Communications of Alexion
Pharmaceuticals, Inc., +1-203-271-8210; Media, Mark Marmur of Makovksy +
Company, +1-212-508-9670, Investors, Rhonda Chiger of Rx Communications,
+1-917-322-2569, both for Alexion Pharmaceuticals, Inc.

Web site: http://www.alexionpharm.com/

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