Sodium Thiosulfate – Antidote, Fixer & Reducing Agent

Product name: Sodium Thiosulfate

Synonyms: Sodium hyposulfite

CAS: 7772-98-7 (anhydrous); 10102-17-7 (pentahydrate)

MF: Na2S2O3

MW: 158.11 (anhydrous)


Sodium thiosulfate is an inorganic salt used as a reducing agent, complexing agent, and detoxifying agent.

Medically, injectable forms are used as an antidote in cyanide poisoning and to mitigate toxicity of certain drugs, under strict supervision.

It is also used in photographic fixing solutions, water treatment, and analytical chemistry.

Pharmaceutical grades feature tight control of impurities to ensure safety and performance.