AEterna Zentaris to Announce Second Quarter 2010 Financial and Operating Results on August 12, 2010

Québec City, Canada, August 4, 2010 – Aeterna Zentaris Inc. (NASDAQ: AEZS, TSX: AEZ) (the ”Company”), a late-stage drug development company specialized in oncology and endocrinology, will announce its second quarter 2010 financial and operating results before market open on Thursday, August 12, 2010. The Company will host a conference call and webcast to discuss these results later that same day at 1:30 p.m., Eastern Time.

Participants may access the live webcast via the Company’s website at www.aezsinc.com in the "Investors" section, or by telephone using the following numbers: in Canada, 514-807-9895 or 647-427-7451, outside Canada, 888-231-8191. A replay of the webcast will also be available on the Company’s website for a period of 30 days.

About Aeterna Zentaris Inc.

Aeterna Zentaris Inc. is a late-stage drug development company specialized in oncology and endocrinology. News releases and additional information are available at www.aezsinc.com.

Investor Relations Ginette Vallières Investor Relations Coordinator (418) 652-8525 ext. 265 gvallieres@aezsinc.com

Media Relations Paul Burroughs Director of Communications (418) 652-8525 ext. 406 pburroughs@aezsinc.com