⚕️ Full Prescribing Information
For complete safety information, warnings, and dosage guidelines:
View FDA Label (PDF) →📋 Overview
Benadryl is a first-generation antihistamine effective for allergies but causes significant drowsiness. Often used as a sleep aid.
How It Works
Benadryl crosses the blood-brain barrier and blocks histamine H1 receptors centrally, causing both allergy relief and sedation.
✓ FDA Approved Uses
- Allergic reactions
- Hay fever
- Common cold symptoms
- Itching
- Hives
- Motion sickness
- Sleep aid
⚡ Common Side Effects
Contact your doctor if these persist or worsen:
- Drowsiness
- Dry mouth
- Dizziness
- Blurred vision
- Constipation
- Urinary retention
🚨 Serious Side Effects
Seek immediate medical attention if you experience:
- Confusion (especially elderly)
- Seizures
- Irregular heartbeat
- Severe allergic reaction
⚠️ Do Not Use If
- Allergic to diphenhydramine
- Narrow-angle glaucoma
- Urinary retention
- Severe asthma
📢 Important Warnings
- Significant drowsiness
- Do not drive or operate machinery
- Elderly more susceptible to confusion
- Anticholinergic effects