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A member asked:

How many minutes does it take for diphenhydramine to kick in? please answer for these categories: itch, sleepiness, empty stomach, with food

A doctor has provided 1 answer
Dr. Troy Ross answered

Specializes in Occupational Medicine

Less than an hour: It all depends on gastric absorption, but should be effective within 45 minutes.

Dr Chuu agreed

Answered 12/12/2019

5.2k views

Thank

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