Press Releases
April 13, 2006

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

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

Cheshire, CT, April 13, 2006 -Alexion Pharmaceuticals (Nasdaq: ALXN), today announced that the Company will conduct a conference call and audio web cast on Thursday, April 27, 2006, at 9:00a.m. Eastern Time (ET), in conjunction with the release of its financial results for the first quarter ended March 31, 2006. Alexion anticipates releasing its financial results at 6:30a.m. ET on Thursday, April 27, 2006.

To participate in this conference call, dial (719) 457-2629, confirmation code 4602251, 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 4602251. The audio web cast can be accessed at: www.alexionpharm.com.