Alexion Pharmaceuticals, Inc. (Nasdaq: ALXN) today announced that the Company will report its financial results for the fourth quarter and year ended December 31, 2011 on Thursday, February 9, 2012 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 9, 2012, at 10:00 a.m. Eastern Time (ET).

To participate in this conference call, dial 866-730-5770 (USA) or 857-350-1594 (International), passcode 36208284 shortly before 10:00 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 888-286-8010 (USA) or 617-801-6888 (International), passcode 69128488. The audio web cast can be accessed at: www.alexionpharma.com.

[ALXN-G]

Alexion Pharmaceuticals, Inc.
Irving Adler, 203-271-8210
Sr. Director Corporate Communications
or
Makovksy + Company (Media)
Mark Marmur, 212-508-9670
or
Rx Communications (Investors)
Rhonda Chiger, 917-322-2569