Diphenhydramine Dosage

Diphenhydramine (e.g. Benadryl™) is a medication that is used to treat allergic reactions. As in the case of any medication, the right dosage must be used to ensure the optimum effect with a minimum of side effects. The table below will help you to evaluate the dosage to be given to a child, based on his/her weight. Usually, diphenhydramine is given in doses of 1.25 mg per kilo of weight, every 6 hours.

You will note that the dosages are given in millilitres (mL) rather than in teaspoons. This is because teaspoons are not accurate enought for measuring medication. Ask your pharmacist to give you a dosing syringe or another measurement device that will enable you to obtain accurate dosages at all times.

(lb)(kg) oral liquid
6.25 mg/5 mL
12.5 mg/5 mL
tablet 12.5 mg
22-2710-1212.5 mg10 mL5 mL
28-3213-1416.25 mg13 mL6 mL
33-3815-1718.75 mg15 mL7.5 mL1 ½
39-4318-1922.5 mg18 mL9 mL
1 ½
44 et plus20 et plus25 mg20 mL10 mL2

This dosage is given every 6 hours, only as needed.
Do not give more than 4 doses in a 24 hour-period.
Consult your pharmacist before giving diphenhydramine to a child under 2 years old.

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