( PALO ALTO Calif. May 31 2007 /PRNew...)Alexza Pharmaceuticals to Present AZ-001 Phase IIb Clinical Data at,the American Headache Society Meeting,Health

PALO ALTO, Calif., May 31, 2007 /PRNewswire-FirstCall/ -- Alexza Pharmaceuticals, Inc. announced today that it will present at the 49th Annual American Headache Society Meeting the results of a Phase IIb clinical trial of Staccato(R) prochlorperazine (AZ-001) for the acute treatment of migraine headache. The poster presentation, "Efficacy and tolerability profile of AZ-001 (Staccato prochlorperazine) in patients with migraine headache" (Poster S-72), will be available for viewing at the meeting at the Hyatt Regency Chicago Hotel in Chicago, Illinois on Saturday, June 9, 2007 from 12:15 to 1:00 pm.

Alexza Pharmaceuticals is an emerging pharmaceutical company focused on the development and commercialization of novel, proprietary products for the treatment of acute and intermittent conditions. The Company's technology, the Staccato system, vaporizes unformulated drug to form a condensation aerosol that allows rapid systemic drug delivery through deep lung inhalation. The drug is quickly absorbed through the lungs into the bloodstream, providing speed of therapeutic onset that is comparable to intravenous administration, but with greater ease, patient comfort and convenience. The Company has five product candidates in clinical development; AZ-001 (Staccato prochlorperazine) for the acute treatment of migraine headaches, AZ-004 (Staccato loxapine) for the treatment of acute agitation in patients with schizophrenia, AZ-002 (Staccato alprazolam) for the acute treatment of panic attacks associated with panic disorder, AZ-003 (Staccato fentanyl) for the treatment of patients with acute pain and AZ-007 (Staccato zaleplon) for the treatment of sleep disorder in patients who have difficulty falling asleep.

CONTACT: Thomas B. King, President & CEO of Alexza Pharmaceuticals, Inc.,+1-650-687-3900, tking@alexza.com

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