For many years, diphenhydramine (Benadryl) was the “go-to” medication for allergies and hives. However, pediatricians and allergists are no longer recommending diphenhydramine for simple allergic reactions because of concerns over side effects, lack of efficacy compared to newer over-the-counter antihistamines like cetirizine (Zyrtec), and potential risks from chronic use. Zyrtec is approved for use from ages 6 months and up.
Benadryl is a first-generation antihistamine, which means it crosses into the brain and commonly causes:
• Drowsiness and sedation
• Difficulty concentrating
• Hyperactivity in some children
• Dry mouth and other anticholinergic side effects
In contrast, newer antihistamines such as Zyrtec:
✔️ Last longer (24-hour relief)
✔️ Cause much less sedation
✔️ Allow children to function better at school and activities
✔️ Have a better overall safety profile
Important reminder: Benadryl may still have a role in certain emergency allergic reactions when specifically recommended by your physician. Epinephrine remains the first-line treatment for anaphylaxis.
For more information:
- CNN article: https://www.cnn.com/2025/08/01/health/allergy-drug-diphenhydramine
- World Allergy Organization review: https://www.worldallergyorganizationjournal.org/article/S1939-4551(25)00002-X/fulltext
- Dosing link can be found here: Cetirizine Dosing Chart | Boston Children’s Health Physicians
Pediatric Antihistamine Dosing Chart
Cetirizine (Zyrtec®)
| Age | Dose | Max Daily Dose |
| 6-23 months | 2.5 mg once daily | 2.5 mg |
| 2-5 years | 2.5 mg once daily (may increase to 5 mg/day) | 5 mg |
| 6-11 years | 5-10 mg once daily | 10 mg |
| ≥12 years | 10 mg once daily | 10 mg |
As always, please call us with any questions and before starting or changing any medication for your child.
