Alexion Pharmaceuticals to Report Fourth Quarter and Full Year 2010 Results on Thursday, February 10, 2011

Alexion Pharmaceuticals, Inc. (Nasdaq: ALXN), today announced that the Company will report its financial results for the fourth quarter and full year ended December 31, 2010 on Thursday, February 10, 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, February 10, 2011, at 10:00 a.m. Eastern Time (ET).

To participate in this conference call, dial 719-457-2735, confirmation code 6342085 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 719-457-0820, confirmation code 6342085. The audio web cast can be accessed at: www.alexionpharma.com.

[ALXN-G]