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30/10/2025, 18:21 Pharmaceutical Dosage Calculations

Drug Dosage Based on Age

Before the physiologic differences between adult and pediatric patients were
clarified, the latter were treated with drugs as if they were merely miniature
adults.
Various rules of dosage in which the pediatric dose was a fraction of the adult
dose, based on relative age, were created (e.g., Young's rule).
Today these rules are not in general use because age alone is no longer
considered a singularly valid criterion in the determination of accurate dosage for
a child, especially when calculated from the usual adult dose, which itself
provides wide clinical variations in response.
4 weeks = 1 month

Drug Dosage Based on Age

Example Calculations of Dose Based on Age

An over-the-counter cough remedy contains 120 mg of dextromethorphan in a 60-mL
bottle of product. The label states the dose as 1.5 teaspoonfuls for a child 6 years of
age. How many milligrams of dextromethorphan are contained in the child's dose?

So, 15 mg drug is the calculated dose. 69/

Drug Dosage Based on Body Weight
Dosing in this manner makes the quantity of drug administered specific to the
weight of the patient being treated.
Patient's dose (mg) = Patient's weight (kg) × Drug dose (mg/kg)
Example Calculations of Dose Based on Body Weight

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