A child weighs 18 kg and is prescribed a medicine at 30 mg/kg/day in three equal doses. The liquid contains 90 mg in 5 mL. How many millilitres should the nurse give per dose?
Correct answer: C. 10 mL
- A. 5 mL
- B. 8 mL
- C. 10 mL
- D. 12 mL
Explanation
The daily dose is 18 × 30 = 540 mg, so each of three doses is 180 mg. Since 90 mg is in 5 mL, 180 mg requires 10 mL.
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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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