Press Releases
April 25, 2006

Alexion To Present At Investor Conferences

Alexion To Present At Investor Conferences

Cheshire, CT, April 25, 2006 -- Alexion Pharmaceuticals, Inc. (Nasdaq: ALXN) today announced that Dr. Leonard Bell, Chief Executive Officer of Alexion Pharmaceuticals, will present at two upcoming investor conferences; one sponsored by Deutsche Bank Securities and the other by Morgan Stanley.

Dr. Bell will present at the Deutsche Bank 2006 Health Care Conference in Boston at 2:30 p.m., eastern, on Tuesday, May 2, 2006. Dr. Bell will also present at the Morgan Stanley Global Healthcare Unplugged Conference in Miami at 11:00 a.m., eastern, on Friday, May 5, 2006.

Dr. Bell's remarks will be webcast live at both conferences. You can access the audio webcasts at: www.alexionpharm.com. Archived versions of the remarks will also be available through the Company's web site for a limited time following the conferences.