Benzpheniramine Hydrochloride includes Benzpheniramine Hydrochloride Tablets and Benzpheniramine Hydrochloride Injection, Benzpheniramine Hydrochloride Tablets have sedative, hypnotic, anti-sickness movement, anti-emetic and anti-cholinergic effects; Benzpheniramine Hydrochloride Injection has the effects of local anesthesia, antiemetic, antihistamine and anti-tremor paralysis. Benzylhydramine Hydrochloride Tablet has a significant central inhibitory effect, sedative, anti-motion sickness and antiemetic effect, also has an anticholinergic effect, can alleviate the spasm of bronchial smooth muscle, used for a variety of allergic skin diseases, such as urticaria, insect bites; also used for motion sickness, nausea, vomiting. Diphenhydramine Hydrochloride Injection is mainly used for the treatment of acute severe allergic reactions, which can reduce the allergic reactions caused by blood or plasma transfusion; post-surgical drug-induced nausea and vomiting, Parkinson’s disease and extrapyramidal symptoms, dental local anesthesia, and so on. Common adverse reactions of taking phenylephrine hydrochloride tablets include drowsiness, dizziness, headache, dry mouth, nausea, vomiting, etc. The elderly are prone to prolonged drowsiness or dizziness after using the drug. Common adverse reactions of using Diphenhydramine Hydrochloride Injection include drowsiness, dizziness, headache, dry mouth, nausea, and epigastric discomfort. The contraindications of phenylephrine hydrochloride tablets are caution for pregnant and lactating women, neonates and preterm infants are prohibited, myasthenia gravis, angle-closure glaucoma, prostate hypertrophy, and those who are allergic to the product are prohibited. Contraindications for Benzylamine Hydrochloride Injection are myasthenia gravis, closed-angle glaucoma, prostate hypertrophy and those who are allergic to the product are prohibited. Patients need to take the drug under the supervision of a medical professional.