Press Releases
January 25, 2007

Alexion Pharmaceuticals Invites You to Participate in its Fourth Quarter Results Conference Call and Web Cast

Alexion Pharmaceuticals Invites You to Participate in its Fourth Quarter Results Conference Call and Web Cast

Cheshire, CT, January 25, 2007 -- Alexion Pharmaceuticals (Nasdaq: ALXN), today announced that the Company will conduct a conference call and audio web cast on Thursday, February 15, 2007, at 9:00a.m. Eastern Time (ET), in conjunction with the release of its financial results for the fourth quarter and year ended December 31, 2006. Alexion anticipates releasing its financial results at 6:30a.m. ET on Thursday, February 15, 2007.

To participate in this conference call, dial (719) 457-2629, confirmation code 4897495, shortly before 9:00a.m. ET. A replay of the call will be available from 12:00p.m. ET through a limited time thereafter. The replay number is 719-457-0820, confirmation code 4897495. The audio web cast can be accessed at: www.alexionpharm.com.