A 28 kg child receives 6 mg/kg/day divided into two doses. What is per-dose mg?

A 28 kg child receives 6 mg/kg/day divided into two doses. What is per-dose mg?

• A. 84 mg
• B. 168 mg
• C. 42 mg
• D. 126 mg

Answer: (A)

When dosing by mg/kg per day split into multiple doses, calculate the total daily amount first, then divide by the number of doses. For this child, 28 kg × 6 mg/kg/day = 168 mg per day. Since it’s given in two doses, each dose is 168 ÷ 2 = 84 mg. A quick check helps confirm: 84 mg ÷ 28 kg = 3 mg/kg per dose, and two doses yield 6 mg/kg/day, matching the prescription.

When dosing by mg/kg per day split into multiple doses, calculate the total daily amount first, then divide by the number of doses. For this child, 28 kg × 6 mg/kg/day = 168 mg per day. Since it’s given in two doses, each dose is 168 ÷ 2 = 84 mg. A quick check helps confirm: 84 mg ÷ 28 kg = 3 mg/kg per dose, and two doses yield 6 mg/kg/day, matching the prescription.