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A member asked:
How long does it take for the symptoms of a benadryl (diphenhydramine) overdose to go away?
A doctor has provided 1 answer
How much?: Depends on how much you took and how you metabolize it. The half life is 3-9 hours. That means that in general it will be out of your system in 15 hours to 2 days unless you took a huge amount or have liver disease. Why did you od?
Answered 9/3/2016
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