Is Thimerosal halal?
Thimerosal is classified halal for halal use with High confidence. An ethylmercury-containing preservative used in some multi-dose vaccines and a few biological products. Synthetic; halal in itself. Single-dose pre-filled syringes are generally thimerosal-free.
Excipient (preservative) · Confidence: High
Also known as: thiomersal, ethylmercury
An ethylmercury-containing preservative used in some multi-dose vaccines and a few biological products.
Source:FDA — Thimerosal and vaccinesCDC — Thimerosal in vaccines
Prevents bacterial contamination of multi-dose vials.
See:FDA — Thimerosal and vaccinesCDC — Thimerosal in vaccines
Synthetic; halal in itself. Single-dose pre-filled syringes are generally thimerosal-free.
Source:FDA — Thimerosal and vaccinesCDC — Thimerosal in vaccines
- Synthetic
Questions to ask
- Is a thimerosal-free, single-dose version available?
Reason codes
Evidence & citations2
AuditCommon questions
- Is Thimerosal halal?
- RxHalal currently classifies Thimerosal as HALAL (High confidence). Synthetic; halal in itself. Single-dose pre-filled syringes are generally thimerosal-free. This is information only — not a fatwa or medical advice.
- What is Thimerosal used for in medicines?
- An ethylmercury-containing preservative used in some multi-dose vaccines and a few biological products. Prevents bacterial contamination of multi-dose vials.
- What are common sources of Thimerosal?
- Common sources include: Synthetic. Manufacturers often do not disclose which source is used.
- Is a thimerosal-free, single-dose version available?
- Ask your pharmacist or prescriber. RxHalal lists this because Thimerosal is halal in our cited database.