1, skin and mucosa of allergy, such as urticaria, angioneurotic edema, allergic rhinitis, skin itch, pruritus, genital pruritus, or itching jaundice of drug eruption, insect bites and contact dermatitis are also valid;
2, acute allergic reaction, reduces allergic reactions caused by blood transfusion or plasma; often applied before the transfusion antihistamine such as diphenhydramine, usually given to diphenhydramine hydrochloride 40 mg intramuscularly, and pay attention to the screening of blood donors, try not to use with a history of allergy blood donors. To avoid repeating the same blood donors of blood infusion to prevent Antigen-antibody reaction occurs, such as the blood present in the body when there is anti-IgA antibodies, infusion of red blood cells after washing, this method of washing clears donor blood, the IgA in order to prevent the occurrence of allergic reactions.
3, motion sickness-sickness prevention, has strong antiemetic effect can also be used for prevention and treatment of radiation sickness, vomiting after surgery, drug-induced nausea and vomiting;
4, for Parkinson's disease and extrapyramidal symptoms;
5, sedative, hypnotic and preoperative dose;
6, dental anesthesia, when patients allergic to common local anesthetics high 1% diphenhydramine hydrochloride liquid can be used as a local anesthetic for dental;
7, antitussive, as a non-addictive cough medicine is suitable for treating a cold or cough caused by allergies, but its antitussive effects have not been sure.
8, other, Xu Heding, Xue Shijian, Lu Xiaobing and other reports, take diphenhydramine 50mg daily before sleeping, even served 10-14, treat symptoms salivation caused by clozapine, is safe and effective.