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Benadryl Side Effects Center: Detailed Datasheet

Medically reviewed by Min Clinic Staff | Updated: January 2026

Benadryl (Diphenhydramine) side effects drug center

 

PROFESSIONAL

CONSUMER

SIDE EFFECTS

 

Benadryl Side Effects Center

What Is Benadryl?

Benadryl (diphenhydramine) is an antihistamine used to treat allergies, hives, insomnia, motion sickness, and mild cases of Parkinsonism. Benadryl is available in generic form and over-the-counter (OTC).

What Are Side Effects of Benadryl?

Common side effects of Benadryl include: