Dose in millilitres
Dose in milligrams
For ages 1 month to 18 years only.

This calculator uses 12.5mg/kg per dose

General Dosing:
1 month - 18 years 12.5–25 mg/kg (usually up to 500 mg; maximum 1 g) 4 times daily (see note below)
Note High doses (25 mg/kg, maximum 1 g) should be used in severe infection (e.g. step-down therapy from intravenous to oral dosing, or deep site infection). High oral doses may be poorly tolerated due to gastrointestinal adverse effects.
Calculator written by Dr Jeremy Steinberg, GP. Contact for suggestions