Exhibit 15.1
| PricewaterhouseCoopers |
| LLP/s.r.l./s.e.n.c.r.l. |
| Chartered Accountants |
| Place de la Cité, Tour Cominar |
| 2640 Laurier Boulevard, Suite 1700 |
| Québec, Quebec |
| Canada G1V 5C2 |
| Telephone +1 (418) 522 7001 |
| Facsimile +1 (418) 522 5663 |
Consent of Independent Auditors
We hereby consent to the incorporation by reference in the Registration Statement on Form F-3/A (No. 333-165037) of our report dated March 23, 2010 relating to the consolidated financial statements, financial statement schedules, Valuation and Qualifying Accounts and Export Sales, and the effectiveness of internal control over financial reporting, which appears in Æterna Zentaris Inc.’s Annual Report on Form 20-F for the year ended December 31, 2009. We also consent to the reference to us under the heading “Experts” in such Registration Statement.
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Chartered Accountants
Quebec City, Province of Quebec, Canada
March 30, 2010
“PricewaterhouseCoopers” refers to PricewaterhouseCoopers LLP/s.r.l./s.e.n.c.r.l., an Ontario limited liability partnership, or, as the context requires, the PricewaterhouseCoopers global network or other member firms of the network, each of which is a separate legal entity.