A child weighing 10 kg is prescribed 1 mg/kg every 8 hours. How many mg are given in one day?

• A. 30 mg
• B. 20 mg
• C. 10 mg
• D. 40 mg

Answer: (A)

For mg/kg dosing, figure out the amount per administration first, then multiply by how many administrations occur in a day.

A 10 kg child receiving 1 mg per kg gets 10 mg per dose (10 kg × 1 mg/kg = 10 mg). With a dose every 8 hours, there are three doses in 24 hours (24 ÷ 8 = 3). So the daily total is 10 mg × 3 = 30 mg per day.

Thus, 30 mg in one day is the correct total. The other options would require fewer or more doses per day or a single dose, which doesn’t match the 8-hour interval.