2 doctors weighed in:

How long does Benadryl (diphenhydramine) side effects last?

2 doctors weighed in
Dr. John Chiu
Internal Medicine - Allergy & Immunology
1 doctor agrees

In brief: Less than 12 hrs

Likely from 6 to 12 hrs.

In brief: Less than 12 hrs

Likely from 6 to 12 hrs.
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