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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.

Dr Altman and 3 doctors agreed

Answered 3/11/2018

4.7k views

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Took 4 Benadryl (diphenhydramine) pills will that help me sleep fast?

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Can you use Benadryl (diphenhydramine) to help you fall asleep before it won't work anymore?

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How does hydrocodone cream works? How can my hubby be alergic to benadryl (diphenhydramine) but not hydrocodone? Aren't they the same thing?

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I seem to have developed an allergy to our new dogs. Tried several antihistamines but Benadryl (diphenhydramine) works best. Can i take on a regular basis?

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A member asked:

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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