A child weighs 16 kg and is prescribed a medicine at 8 mg/kg per dose. The liquid contains 160 mg in 5 mL. How many millilitres should the nurse administer per dose?
Correct answer: C. 4 mL
- A. 2 mL
- B. 3 mL
- C. 4 mL
- D. 5 mL
Explanation
The required dose is 16 kg × 8 mg/kg = 128 mg. The liquid provides 160 mg in 5 mL, so 128 ÷ 160 × 5 = 4 mL. The calculation uses the dose per kilogram for one dose, not a daily dose divided again.
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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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