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Potassium Sodium Tartrate

Last updated on November 22nd, 2021

Drug Nomenclature

Synonyms: E337; Kálium-nátrium-tartarát; Kalii Natrii Tartras; Kalio-natrio tartratas; Kalium Natrium Tartaricum; Kaliumnatriumtartraatti; Kaliumnatriumtartrat; Potassium Sodium Tartrate; Rochelle Salt; Seignette Salt; Sodii et Potassii Tartras; Sodium Potassium Tartrate; Tartarus Natronatus; Tartrato de potasio y de sodio; Vinan draselno-sodný
Molecular formula: C4H4KNaO6,4H2O =282.2
CAS: 304-59-6 (anhydrous sodium potassium tartrate); 6381-59-5 (sodium potassium tartrate tetrahydrate); 6100-16-9 (sodium potassium tartrate tetrahydrate)

Pharmacopoeias. In Europe and US.

Potassium Sodium Tartrate

European Pharmacopoeia, 6th ed. (Potassium Sodium Tartrate Tetrahydrate). A white or almost white, crystalline powder or colourless transparent crystals. Very soluble in water practically insoluble in alcohol.

The United States Pharmacopeia 31, 2008 (Potassium Sodium Tartrate). Colourless crystals or a white, crystalline powder, with a cooling, saline taste. It effloresces slightly in warm dry air, the crystals often being coated with a white powder. Soluble 1 in 1 of water practically insoluble in alcohol. Store in airtight containers.


Potassium sodium tartrate has been used as an osmotic laxative. It is also used as a food additive.

For the general properties of potassium salts, and of sodium salts.


BPC 1973: Compound Effervescent Powder

Proprietary Preparations

Greece: Trigolax.


Austria: Laxalpin

France: Romarene

Philippines: Castoria

UK: Jaaps Health Salt.

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