99% Levamisole HCl, 16595-80-5, 240-654-6, Manufacturer Stock. Levamisole HCl, also known simply as Levamisole hydrochloride, is a medication and anthelmintic (anti-worm) drug that is used to treat various medical conditions in humans and animals. It is the hydrochloride salt form of Levamisole, which is the active ingredient. This compound is primarily recognized for its antiparasitic properties and immune system-boosting effects.