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

CHESHIRE, Conn., April 13 /PRNewswire-FirstCall/ -- Alexion Pharmaceuticals (NASDAQ: ALXN) , today announced that the Company will conduct a conference call and audio web cast on Tuesday, May 1, 2007, at 9:00a.m. Eastern Time (ET), in conjunction with the release of its financial results for the first quarter ended March 31, 2007. Alexion anticipates releasing its financial results at 6:30a.m. ET on Tuesday, May 1, 2007.

To participate in this conference call, dial (913) 981-5533, confirmation code 2484367, 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 2484367. The audio web cast can be accessed at: http//http://www.alexionpharm.com/.