Doctors give trusted answers on uses, effects, side-effects, and cautions: Dr. Brenneman on benadryl dosage for 7 year old: When you submit a question, you must provide enough background information for site docs to review.You must also submit a concise question that reflects the info submitted. This is not a chat room, so any question must be complete,we do not have access to your previous. The recommended Benadryl dosage for treating allergy or common cold symptoms in adults and children ages 12 years and older is 25 to 50 mg every four to six hours. For children 6 to 12 years old, the recommended dosage is 12.5 to 25 mg every four to six hours. Give your children effective relief from allergies with a liquid allergy medicine that’s cherry-flavored and contains an antihistamine that helps them feel better when they need it. If your pediatrician does recommend the antihistamine for your 2- to 5-year-old, be sure to confirm with him or her the correct Benadryl dosage—and write it down! Once your child is 6 or older, it’s okay to follow the Children’s Benadryl dosage guidelines on the bottle. age 6 to under 12 years old consult your physician for the following 2 medications listed 12 + years Benadryl Allergy Sinus Headache Caplet and Gelcaps (2 caplets/gelcaps) not to exceed 8 in 24hrs 12+ years Benadryl Allergy UltraTab 25mg Tablets/Kapseal (1 to 2 tablets) not to exceed 12 tablets in 24hrs Learn about BENADRYL® anti-itch and allergy products here. Find out how they can help your next sneezing fit or help that itchy sunburn. Find out how they can help your next sneezing fit or help that itchy sunburn. It should not be given if under 4 years old. If under 6 years, don't give products with more than one ingredient in them (FDA recommendation 2008). If under 6 years, don't give products with more than one ingredient in them (FDA recommendation 2008). Benadryl Dosage Chart Benadryl can help reduce your child's symptoms during an allergic reaction. Benadryl which is also available as generic Diphenhydramine is an over-the-counter antihistamine for use during allergic reactions. Benadryl dosing is based on weight and not age. The following chart can help determine the correct dose for your child based on your child’s weight, but is no.