Dosage By Weight CalculatorBenadryl®

Benadryl® Dosage by Weight Calculator

Reviewed by expert pediatric providers

Infant Benadryl® Dosage Calculator
Child's weight
Recommended dose:0.00

If your child is under 3 years of age, consult your local physician.

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Benadryl® dosage for children


​​Benadryl® (diphenhydramine) is an antihistamine used to relieve symptoms of allergy, hay fever, and the common cold.


Repeat every 6 hours as needed.

Age Limit

Do not give to children under 1 year of age without checking with your child's health care provider first

About this toolThis dosage calculator is not a substitute for professional medical advice, diagnosis or treatment. If you think your child may have a life threatening emergency, immediately call your doctor or dial 911.  If you think your child has taken too much medicine, call the poison control center at 1-800-222-1222 immediately. Signs of poisoning include nausea, vomiting, fatigue, and abdominal pain. These medication dosages are calculated by expert pediatric professionals. These dosages are based on your child's weight and may be different than the fixed dosages found in the medication packaging. Medication packaging dosages often underestimate what is acceptable for children.