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What Is Diphenhydramine HCl 50 Mg?

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Diphenhydramine HCL 50 mg is a non-prescription antihistamine used for the relief of allergy symptoms and as a sleep aid, according to DailyMed. Also manufactured under the brand name Benadryl, it is sometimes used to prevent or treat motion sickness.

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Because diphenhydramine is a sedative and a central nervous system depressant, the drug may cause drowsiness, so it may have a negative impact on people who take it before engaging in activities requiring mental alertness, such as driving a car, states Daily Med. The National Highway Traffic Safety Administration cites research showing that diphenhydramine significantly impairs psychomotor performance and may have a greater impact on driving performance than alcohol.

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