A prescription calls for 30 mg/kg/day divided every 12 hours for a child weighing 28 kg. What is the per-dose amount in mg?

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Study for the Archer Pharmacology Test to master dosage calculations and medication administration. Use flashcards and multiple choice questions with detailed explanations. Get ready for your exam!

Multiple Choice

A prescription calls for 30 mg/kg/day divided every 12 hours for a child weighing 28 kg. What is the per-dose amount in mg?

Explanation:
When a dose is given as a mg/kg/day divided into multiple administrations, calculate the total daily amount first, then split it by the number of doses per day. Weight times the daily mg per kg: 28 kg × 30 mg/kg/day = 840 mg per day. Since the dosing interval is every 12 hours, there are two doses in a day. So per dose = 840 mg ÷ 2 = 420 mg. This matches the correct per-dose amount. (The other numbers correspond to common missteps: 840 mg is the daily total, not per dose; 210 mg would come from dividing by four doses in a day; 28 mg omits the mg/kg and the daily calculation.)

When a dose is given as a mg/kg/day divided into multiple administrations, calculate the total daily amount first, then split it by the number of doses per day.

Weight times the daily mg per kg: 28 kg × 30 mg/kg/day = 840 mg per day. Since the dosing interval is every 12 hours, there are two doses in a day. So per dose = 840 mg ÷ 2 = 420 mg.

This matches the correct per-dose amount. (The other numbers correspond to common missteps: 840 mg is the daily total, not per dose; 210 mg would come from dividing by four doses in a day; 28 mg omits the mg/kg and the daily calculation.)

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