Exhibit 99.1

May 9, 2024	1500 Robert-Bourassa Blvd., 7th Floor Montreal QC, H3A 3S8 www.computershare.com
To: NASDAQ
Subject: Aeterna Zentaris Inc.

Dear Sir/Madam:

We advise of the following with respect to the upcoming Meeting of Security Holders for the subject Issuer:

Meeting Type : Record Date for Notice of Meeting : Record Date for Voting (if applicable) : Beneficial Ownership Determination Date : Meeting Date : Meeting Location (if available) : Issuer sending proxy related materials directly to NOBO: Issuer paying for delivery to OBO: No	Annual General and Special Meeting June 3, 2024 June 3, 2024 June 3, 2024 July 2, 2024 Virtual Meeting No Yes
Notice and Access (NAA) Requirements:
NAA for Beneficial Holders	No
NAA for Registered Holders	No
Voting Security Details:

Description	CUSIP Number	ISIN
COMMON SHARES	007975600	CA0079756007

Sincerely,

Computershare

Agent for Aeterna Zentaris Inc.