Cetirizine dose for children: age and weight guide

The short answer: 2.5 mg once daily for age 2–5, 5–10 mg once daily for age 6+ — preferred over first-generation antihistamines

Cetirizine (Zyrtec) is a second-generation antihistamine that causes significantly less sedation than older drugs like diphenhydramine. It is approved for children from 6 months of age and is the preferred allergy medication for kids with chronic urticaria, allergic rhinitis, and seasonal allergies.

Is cetirizine approved for children?

| Age | FDA/EMA Approval | |---|---| | Under 6 months | Not recommended | | 6–23 months | Approved in many countries (0.25 mg/kg) | | 2–5 years | Approved | | 6–11 years | Approved | | 12+ years | Adult dosing |

Dosing by age

For cetirizine 1 mg/mL oral solution:

| Age | Dose | mL of 1 mg/mL | |---|---|---| | 6–11 months | 2.5 mg once daily | 2.5 mL | | 12–23 months | 2.5 mg once daily (or 2.5 mg twice daily for severe symptoms) | 2.5 mL | | 2–5 years | 2.5 mg once daily (can increase to 5 mg once daily) | 2.5–5 mL | | 6–11 years | 5 mg once daily (can increase to 10 mg once daily) | 5–10 mL | | 12+ years | 5–10 mg once daily | adult dose |

Maximum 10 mg/day regardless of age.

Formulations for children

• Oral solution/syrup (1 mg/mL) — most common for <6 years
• Chewables (2.5 mg, 5 mg, 10 mg) — age 2+
• Tablets (5 mg, 10 mg) — older children/adolescents
• Dissolvable tablets — convenience, same dosing

When and why to choose cetirizine

• Seasonal allergies (pollen, grass)
• Chronic urticaria — ongoing treatment
• — nasal itching, sneezing, runny nose