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A member asked:
How fast should benadryl (diphenhydramine) work?
A doctor has provided 1 answer
15 to 60 minutes: It start working within 15 to 60 minutes of ingestion.
Answered 3/11/2018
4.7k views
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I was wondering: if Benadryl (diphenhydramine) only works for 4 hours and it also causes drowsiness, why people use it during the day? That seems dangerous...
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