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A member asked:
Strange side effects of benadryl (diphenhydramine)?
A doctor has provided 1 answer
Several: The most common side effect of taking too much Benadryl (diphenhydramine) would be excessive drowsiness. Other possible side effects include dizziness, headache, constipation, urinary retention, and heart palpitations.
Answered 2/24/2018
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