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A member asked:
How long does it take for benadryl (diphenhydramine) to make you drowsy?
A doctor has provided 1 answer
About 45 minutes: Benadryl (diphenhydramine) can make some people drowsy. The maximum effect occurs in about 45 minutes or so. However, it can result in hyperalertness in some people.
Answered 6/16/2020
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