A member asked:

How long does it take for benadryl (diphenhydramine) to leave the body?

A doctor has provided 1 answer
Dr. Andrew Oswari answered

Specializes in Family Medicine

Half life is 8 hours: Its effectiveness only lasts 6-8 hours usually. It's half life is 8 hours, so it may take up to 72 hours to leave your system completely.

Answered 5/14/2018

5.8k views

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