Atropine is a parasympathetic inhibitor, which can be used as pupil dilator and cathartic in ophthalmology; It can reduce hay fever, cold, nasal obstruction and intestinal spasm; It can be used to treat nocturia in children, and sometimes to relieve ureteral and biliary spasm; It can also be used to treat poisoning caused by organic phosphorus. As an anticholinergic drug, atropine has many pharmacological effects, which is not conducive to its clinical application. Some substitutes with specific effects have been synthesized successively, such as houmatopine as a pupil dilator. Atropine is highly toxic. When the dose is too large, it can cause visual blur, secretory arrest, vasodilation, high fever, excitement, excitement and delirium. It is an antagonist of morphine, pilocarpine and physostigmine.