Benadryl Dosage By Weight – Adults & Children [DOSING GUIDE]

If your child is suffering from upper respiratory or allergy symptoms, you may want to consider treating them Benadryl.

This is an over-the-counter drug recommended for nasal congestion, itchy skin, hives, and runny nose.

It is important to familiarize yourself with the Benadryl dosage by weight chart before administering the medication to your child.

Dosage Chart

The liquid form measurements are based on 12.5 milligrams/5 milliliters dosages. Each chewable tablet is 12.5 mg, whereas a capsule is 25 mg, so keep this in mind when administering this medication.

  • Benadryl should not be administered to children less than 1 year of age unless prescribed by a pediatrician.
  • Children less than 50 pounds should not be given the 25 mg capsule, and children less than 25 pounds should not be administered the chewable 12.5 mg tablet.
  • Children 20-24 pounds – 4 milliliters
  • Children 25-37 pounds – 5 milliliters or 1/2 of a 12.5 mg chewable tablet
  • Children 38-49 pounds – 7.5 milliliters or 1 1/2-12.5 mg chewable tablet
  • Children 50-99 pounds – 10 milliliters or 2-12.5 mg chewable tablets or 1-25 mg capsule
  • Children 100 pounds or over – 4-12.5 mg chewable tablets or 2-25 mg capsules
  • Adults – 50 mg every 6 hours as needed

Never administer more than the recommended dosage to young children, because they are at a higher risk for overdose than adults.


Always utilize a syringe when administering the liquid Benadryl to your child. The regular spoon is not reliable, and you definitely want to avoid giving too much of this and any other drug to children.

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David Warren is a pharmaceutical specialist that dispenses prescription medication on a daily basis. He received a Bachelor of Science degree in pharmacy from the University of Tennessee in 1991. With over 50 publications on medication-related and pharmacy topics, David has been able to share his experiences and knowledge with others. David with lots of experience and knowledge in medications that are utilized to treat a wide range of medical conditions. Before David dispenses a medication to a patient, he will go over the side effects, dosage recommendation and contraindications.

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