A member asked:

How long will benadryl (diphenhydramine) make you sleepy for?

A doctor has provided 1 answer
Dr. Al Hegab answered

Specializes in Allergy and Immunology

Depends: on the metabolism of the drug in your system and other factors, can be few to several hours, or may not make you sleepy at all,

Answered 5/7/2018

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