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NCI Dictionary of Cancer Terms


diphenhydramine  listen  (dy-fen-HY-druh-meen)

  A drug used to treat allergies and relieve cough and itching caused by insect bites, sunburn, and poison oak or ivy. It is also used to treat mild Parkinson disease, to prevent and treat motion sickness, to relieve cough and cold symptoms, and as a sleep aid. It is a type of antihistamine.