Alexion Pharmaceuticals to Report Second Quarter 2011 Results on Thursday, July 21, 2011

Alexion Pharmaceuticals, Inc. (Nasdaq: ALXN), today announced that the Company will report its financial results for the second quarter ended June 30, 2011 on Thursday, July 21, 2011 before the financial markets open. Following the release of the financial results, Alexion management will conduct a conference call and audio web cast on Thursday, July 21, 2011, at 10:00 a.m. Eastern Time (ET).

To participate in this conference call, dial 888-437-9357 (USA) or 719-325-2407 (International), confirmation code 9969620 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 888-203-1112 (USA) or 719-457-0820 (International), confirmation code 9969620. The audio web cast can be accessed at: www.alexionpharma.com.

[ALXN-G]