How to calculate pediatric drug doses?

Calculation of pediatric dosages are many a times cumbersome job for medical practitioners of non-pediatric branches. So, here is a simple way of calculation of pediatric drug doses.

Generally you need to know 2 things before prescribing a medicine – the dosage and the preparation in which it is available in the market.

Let’s try to explore the issue with an example.

Suppose we want to prescribe a paracetamol syrup.

First we have to calculate the dosage. So if we want to give at the dose of 15 mg/kg/dose for a 20 kg weight child the dosage will be 300 mg per dose.

Next we have to see at what strength in the market paracetamol is available. Suppose there is a preparation of paracetamol in which 120 mg paracetamol per 5 ml syrup.

So we have to calculate the amount of dosage of syrup we have to give.

A easy way to count dosage is as following-
Dose calculated/dose available x volume = 300/120 x 5 = 12.5 ml

So, 12.5 ml paracetamol is to be given per dosage to the above mentioned example.

By using the formula above almost any drugs dosage can be derived.


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