Best Allergy Medicine For Kids. Benadryl apparently works the fastest, but its main ingredient has been linked to increasing. Zyrtec can be given to children as young as 6 months of age, with caution for drowsiness.
Some otc pills may cause drowsiness, leaving you feeling tired throughout the day. Genexa homeopathic allergy medicine for children: Xyzal has the same active ingredient as zyrtec, so save your money.