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A member asked:
What is the average time of onset of action for im diphenhydramine vs regular pills?
A doctor has provided 1 answer
15-30 minutes: 15 to 30 minutes taken orally, generally a little faster for IM. IM should only be used for those unable to swallow a pill though. The pill form is always safer, works identically, and is always preferred otherwise.
Answered 5/3/2016
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