Promethazine belongs to the first generation of phenothiazine antihistamine, which is the first generation of anti-allergy drugs. It is mainly used to treat various allergic diseases, such as allergic urticaria, rash, itchy skin, etc. It can also be used to treat various motion sickness, such as seasickness, motion sickness, etc. It can also be used to treat nausea, vomiting, etc. When using promethazine, be sure to use the drug under the guidance of a doctor. During the use of promethazine, it may cause adverse reactions such as dizziness, weakness, and drowsiness, so it is best not to drive, work at height, or engage in delicate work, etc. when using promethazine. In addition, do not use drugs with sedative-hypnotic effects, such as diazepam, clonazepam, alprazolam, etc. at the same time when using promethazine.