Kids Antihistamines: What Parents Need to Know

If your child sneezes, itches, or gets a runny nose at the first sign of pollen, you’re probably looking for an antihistamine that’s safe and effective. Not all allergy meds are made equal – some are too strong for little bodies, others can cause drowsiness that messes up school or bedtime. Below is a quick rundown of the top options, how to dose them, and what red‑flags to watch out for.

Top Over‑the‑Counter Picks for Children

Loratidine (Claritin) – 5 mg: This non‑sedating option works well for kids age 2 and up. It won’t make them sleepy, so it’s good for school days. Give one tablet or the appropriate liquid dose once daily.

Cetirizine (Zyrtec) – 5 mg: Another non‑sedating choice that starts at age 2. Some kids feel a mild drowsy effect, but many handle it fine. Same once‑daily dosing.

Fexofenadine (Allegra) – 30 mg: Best for ages 6 and older. It’s completely non‑sedating and works fast. Split the tablet if needed for exact weight‑based dosing.

If your child is under two years old, most OTC antihistamines aren’t recommended. In those cases, a doctor may prescribe a low‑dose prescription formula like diphenhydramine (Benadryl) but only under close supervision because it can cause strong drowsiness and irritability.

How to Dose Safely

Weight matters more than age when you calculate the right dose. A simple rule is 0.25 mg per kilogram of body weight for loratadine or cetirizine, but always follow the package instructions or your pediatrician’s advice.

Measure liquid forms with the dosing cup that comes with the product – kitchen spoons are inaccurate and can lead to over‑dosing. If you miss a dose, give it as soon as you remember unless it’s almost time for the next one; then skip the missed dose.

Watch your child for side effects within the first 24 hours: excessive sleepiness, dry mouth, or trouble urinating can signal the dose is too high. If any of these happen, cut back or switch to a different antihistamine.

Finally, remember that antihistamines treat symptoms, not the cause. Keep windows closed during high pollen days, wash your child's hands after being outdoors, and use a humidifier if indoor air is dry.

Choosing the right kids antihistamine doesn’t have to be stressful. Stick with non‑sedating options for school, double‑check doses based on weight, and keep an eye on how your child feels. When in doubt, give your pediatrician a quick call – it’s better to confirm than guess.