Arecoline hydrochloride is a chemical used primarily in the medical field. It is used in the treatment of glaucoma because it acts as a cholinergic agent that causes constriction of the pupil and a drop in intraocular pressure. In addition, it can paralyze tapeworms, so it is also used as a tapeworm repellent. Medically, arecoline hydrochloride eye drops may be used to relieve symptoms of acute glaucoma