Question

using clarks rule, calculate the pediatric daily dose for a patient who weighs 34 kg (75 lb) and is 8 years old. the adult dose is 500 mg bid.
500 mg
640 mg
400 mg
1,000 mg

Explanation:

Step1: Recall Clark's rule formula

Clark's rule is $\text{Pediatric dose}=\frac{\text{Child's weight (lb)}}{150}\times\text{Adult dose}$. The child's weight is 75 lb and the adult dose is 500 mg bid (twice - a - day), so the total adult daily dose is $500\times2 = 1000$ mg.

Step2: Calculate the pediatric dose

Substitute the values into the formula: $\text{Pediatric dose}=\frac{75}{150}\times1000$. First, $\frac{75}{150}=\frac{1}{2}$. Then, $\frac{1}{2}\times1000 = 500$ mg.

Answer:

500 mg