Exhibit 99.6
| 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 use in this amended Annual Report on Form 40-F/A of Æterna Zentaris Inc. for the year ended December 31, 2006 of our auditors’ report dated March 2, 2007, except as to Note 24(g) and (h) which is as of September 17, 2007, on the consolidated balance sheets of Æterna Zentaris Inc. as at December 31, 2006 and 2005 and the consolidated statements of operations, deficit, other capital and cash flows for each of the years in the three-year period ended December 31, 2006.
Chartered Accountants
Quebec, Quebec, Canada
September 17, 2007
PricewaterhouseCoopers refers to the Canadian firm of PricewaterhouseCoopers LLP/s.r.l./s.e.n.c.r.l. and the other member firms of PricewaterhouseCoopers International Limited, each of which is a separate and independent legal entity.