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

CHESHIRE, Conn., July 12 /PRNewswire-FirstCall/ — Alexion Pharmaceuticals (Nasdaq: ALXN - News), today announced that the Company will conduct a conference call and audio web cast on Wednesday, July 25, 2007, at 9:00 a.m. Eastern Time (ET), in conjunction with the release of its financial results for the second quarter ended June 30, 2007. Alexion anticipates releasing its financial results at 6:30 a.m. ET on Wednesday, July 25, 2007.

To participate in this conference call, dial (719) 457-2734 confirmation code 1272485, shortly before 9:00 a.m. ET. A replay of the call will be available from 12:00 p.m. ET through a limited time thereafter. The replay number is 719-457-0820, confirmation code 1272485. The audio web cast can be accessed at: www.alexionpharm.com.