Up to 24 hours: However if benadryl is causing this , better avoid and use an alternative , better through your doctor. This side effect of benadryl might not go away with repeated usage, also it can a be a side effect of other antihistamines, may be less with the newer ones as cetirizine or loratadine, so better run it by your doctor, good luck
Answered 9/4/2019
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A doctor has provided 1 answer
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