Diphenhydramine. Definition

Medical Definition: Diphenhydramine

A drug used to treat allergies and relieve cough and itching caused by insect bites, sunburn and poison oak or poison ivy. It is also used to treat Parkinson's disease when it is severe, preventing and treating motion sickness (motion sickness in vehicles), relieve cough and cold symptoms, and as a sleep aid. It is a type of antihistamine.

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