CHILDREN'S CLARITIN SYRUP prescription and dosage sizes information for physicians and healthcare professionals. Pharmacology, adverse reactions. Dosage chart based on age & weight for Alavert, Benadryl, Claritin, and Zyrtec. Benadryl Dosage chart Childrens Benadryl Dosage, Baby Health, Kids Health. Loratadine (Claritin). Products labeled “D” or “plus decongestant” are not recommended for children under the age of 6, as they contain additional medications. Experiencing seasonal foe Yes Finally Some Relief Being allergic to so many things and living in the country is hard! Stop use and ask a doctor if an allergic reaction to this product occurs. Keep out of reach of children. Plus, check out allergy relief tips from moms just like you. Look below the correct age for the dose based on the product you have. We comply with the HONcode standard for trustworthy health information - verify here.