How long does diphenhydramine stay in your system?

took drug test - this is in tylenol pm
Answers:    I'm not sure why you'd be concerned about diphenhydramine showing up on a drug test, but I believe it's metabolized by the body pretty quickly. I'd be more concerned about your acetaminophen levels than the diphenhydramine.

Diphenhydramine is simply an antihistamine that causes drowsiness. It's not a narcotic of any type, so it shouldn't cause you any problems if it shows up, and I would be very surprised if anyone even tested for it. If you're concerned about an employer discovering that your "using drugs" don't worry. If you had hay fever, this is a good drug to take. It's not addictive, it doesn't impair you at all (with the exception of the sleepiness).

Why are you concerned about it showing up?
This is benadryl and tylenol. They don't really test for this. It is a legal over the counter medication. Relax.
2-8 hours
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