Drug Dose calculation for Animals

Drug Dose calculation for Animals

How to calculate amount of drug quantity required as a dose?


To calculate quantity of drug required to be taken as dose you should convert them to same Units.

For example, if the available drug is in g and the dose required is in mg then, required dose should be converted to g from mg.  For example:Each 5 ml contains 250 mg Naproxen and is required at 1.5 g so it should be taken as 1500 mg in formula.


Now calculate the required amount of drug to be taken as dose:

Drug dose calculation formula


A goat weighing 38 kg is presented at the clinic with mild bacterial infection. If the prescribed amount of Amoxicillin is 30 mg/kg/day IV.  Amoxicillin is available in the form of 250 mg /5 ml of a vial of 50 ml.

Dose required:

Drug dose calculation example

22.8 ml of fluid should be taken from vial as a required dose.

NOTE:  Nothing in this content is to be used as medical advice. it’s just for educational purpose. None of the drugs are to be used without consulting your veterinarian.