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A member asked:
How long does it take benedryl to go out of your system?
A doctor has provided 1 answer
About 3 days: The metabolism of Benadryl (diphenhydramine) or Diphenhydramine to decrease by half (called the half-life) is about 8 hours (except for children and elderly). With this in mind, it is typically out of the system in about 3 days (at least for allergy testing purposes).
Answered 6/25/2014
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