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Benadryl Side Effects Center: Detailed Datasheet
Medically reviewed by Min Clinic Staff | Updated: January 2026
- Generic Name: diphenhydramine
- Brand Name: Benadryl
- Drug Class: How Do First Generation Antihistamines Work?, Antihistamines, Alkylamine Derivatives
Benadryl (Diphenhydramine) side effects drug center
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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:
- drowsiness,
- fatigue,
- tiredness,
- sleepiness,
- dizziness,
- disturbed coordination,
- constipation,
- dry mouth/nose/throat,
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