Levamisole (marketed as the hydrochloride salt under the trade name Ergamisol) is an antibiotic belonging to a class of synthetic imidazothiazole derivatives. It was discovered at Janssen Pharmaceutica in 1966. Ergamisol was withdrawn from the U.S. and Canadian markets, in 2000 and 2003 respectively, due to occurence of serious side effects in some people in the face of availability of replacement pharmaceuticals . Clinical use It was originally used as an antihelminthic to treat worm infestati… (More on Levamisole)