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ALEXION PHARMACEUTICALS PRICES OFFERING OF 2,500,000 SHARES OF COMMON STOCK

August 12, 2005

Alexion Pharmaceuticals, Inc. (Nasdaq: ALXN) announced today that it priced an offering of 2,500,000 shares of its common stock at a price to the public of $26.75 per share. All of the shares are being offered by Alexion. Alexion intends to use the net proceeds from this offering for general corporate purposes.

PR Newswire (http://www.prnewswire.com/cgi-bin/stories.pl?ACCT=104&STORY=/www/story/08-12-2005/0004087388&EDATE=)