Commonly referred to by the names potassium antimonyl tartrate, potassium antimontarterate, and emetic tartar, antimony potassium tartrate is a double salt of potassium and the antimony of tartaric acid. Known since ancient times as a powerful emetic (substance used to induce vomiting), it was instrumental in the treatment of schistosomiasis (disease caused by parasitic flatworms) and leishmaniasis (parasites spread by sandfly bites). The ancient method for producing this compound was to pour wine into a cup made of pure antimony and let it set for 24 hours before it was consumed to induce vomiting. In the modern era, it is produced by refluxing a potassium hydrogen tartrate solution and antimony trioxide for 15 minutes. This hot mixture is then filtered to precipitate the potassium tartrate crystals. Due to the adverse side effects of ingesting or injecting antimony potassium tartrate in humans and numerous less toxic alternatives, antimony potassium tartrate is typically reserved for use with animals only to induce vomiting for the purpose of diet analysis.