KCN is formed because of the treatment of hydrogen cyanide with aqueous potassium hydroxide solution, followed by the vacuum evaporation of the solution: HCN + KOH KCN + H2O. It makes about 50,000 a lot of potassium cyanide yearly.You can also discover cyanide in selected nitrile compounds used in medications like citalopram (Celexa) and cimetidine