A child weighs 12 kg and is prescribed a medicine at 18 mg/kg/day in two equal doses. The liquid contains 60 mg in 5 mL. How many millilitres should the nurse give per dose?
Correct answer: C. 9 mL
- A. 4.5 mL
- B. 6 mL
- C. 9 mL
- D. 18 mL
Explanation
The daily dose is 12 kg × 18 mg = 216 mg. Each of two doses is 108 mg, and the concentration is 60 mg ÷ 5 mL = 12 mg/mL. Therefore, 108 mg ÷ 12 mg/mL = 9 mL per dose.
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About Drug Calculations and Dosage
Drug calculations apply measurement systems, unit conversions, dosage formulas, tablet and liquid doses, percentage and ratio strength, and weight based dosing. Work also includes calculating IV flow rates, infusion times and doses for children, while distinguishing the prescribed dose from the available concentration.
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