A child weighs 15 kg and is prescribed a medicine at 10 mg/kg per dose. The available liquid contains 100 mg in 5 mL. How many millilitres should the nurse administer per dose?
Correct answer: B. 7.5 mL
- A. 5.5 mL
- B. 7.5 mL
- C. 10 mL
- D. 15 mL
Explanation
Calculate the dose first: 15 kg × 10 mg/kg = 150 mg. Then calculate the volume: 150 mg × 5 mL ÷ 100 mg = 7.5 mL. The weight-based dose must be calculated before using the available concentration.
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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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