Communication on Vaccines Containing Thiomersal as Preservative

Communication on Vaccines Containing Thiomersal as Preservative

Thiomersal (also referred to as thimerosal or ethyl mercury) has been included as a preservative in some vaccines, notably those intended for multi-dose use.

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Document Number: PEM-BMU01- 2025/26
Version: 1
Date Updated: 18/12/2025
File Type: www
Category: Communication to industry
Unit: Biological Medicines