Levamisole Hydrochloride: Purposes & Side Effects. Levamisole Hydrochloride, first developed for veterinary purposes, has now become crucial in human treatment. It is identified by its CAS number 16595-80-5 and EINECS number 240-654-6. This drug is a snow-white crystal-like powder, renowned for its powerful anti-worm effects. It is mostly produced in China, adhering to strict USP/BP/EP…