Originally posted 2012-08-24 03:41:59. Republished by Blog Post Promoter Diphenhydramine is a common antihistamine used by the general public to treat allergies. Generic Name: Diphenhydramine hydrochloride Brand Name: Benadryl Classification: Antihistamine, second generation, ethanolamine Uses: Treatment of hypersensitivity reactions Treatment of motion sickness Treatment of Parkinsonism Nighttime sleep aid Antitussive Actions: Has high sedative, anticholinergic...