Question

physician ordered: keflex 145 mg p.o. q.6h for a child who weighs 37 lb. recommendation: the recommended pediatric dosage of keflex (cephalexin) is 20 to 45 mg/kg/day in q.6h equally divided doses. step 3 of 6: what is the recommended minimum single dosage? ______ mg/dose

Explanation:

Step1: Convert weight to kg

1 lb = 0.453592 kg, so 37 lb = 37×0.453592 kg $\approx$ 16.7839 kg.

Step2: Calculate daily minimum dosage

The minimum recommended dosage is 20 mg/kg/day. So the daily minimum dosage for this child is 20×16.7839 mg $\approx$ 335.678 mg.

Step3: Calculate single - dose minimum

Since the doses are q.6h (4 times a day), the minimum single - dose is $\frac{335.678}{4}$ mg $\approx$ 83.92 mg.

Answer:

83.92