Promethazine is mainly a phenothiazine drug, the main component is promethazine hydrochloride, the main indications are 5: 1, mainly for skin mucosa allergy, for long-term seasonal allergic rhinitis, vasodilatory rhinitis, allergic conjunctivitis, urticaria, angioneurotic edema caused by contact with allergens or food, allergic reactions to blood and plasma products, skin scratching syndrome, when necessary It can be combined with epinephrine as an adjuvant of this drug.2. It is mainly applied to motion sickness, prevention and control of motion sickness, seasickness and airsickness.3. It is mainly sedative and hypnotic, applicable to preoperative, postoperative and obstetrics; in addition, it can also be used to reduce the fear of adults and children in a state of light sleep.4. It is applied to the treatment of nausea and vomiting after some anesthesia and surgery, and also used for radiation sickness or pharmacogenic 5.It is mainly used for post-operative pain, and can be combined with painkillers as auxiliary medication.