Calculating pediatric dosages using Clark's Rule

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Q1. An infant, 15 months old and weighing 20 pounds, needs
Streptomycin Sulfate, which is usually administered to adults as
1 g (1000 mg), as a daily IM injection. What is the appropriate
dosage for the infant?

What you'll need:

Clark's rule formula: (Child's dose=(Child^′ s weight (in pounds))/150×Adult dose)

This formula is based on a child's weight and is more accurate than Young's rule and Fried's rule. It uses the average adult weight (150 lb.) as its basis for calculation.

Q2. A child, weighing 70 pounds, is prescribed quinine sulfate, and the normal adult dose is 325 mg TID. What is the appropriate dosage for the child?