A patient is prescribed 2.5 mg of an oral medicine. The liquid contains 5 mg in 2 mL. What volume should the nurse administer?
Correct answer: B. 1 mL
- A. 0.5 mL
- B. 1 mL
- C. 1.5 mL
- D. 2 mL
Explanation
Use the formula: volume = prescribed dose divided by available dose, multiplied by available volume. Thus, 2.5 mg ÷ 5 mg × 2 mL = 1 mL. The 2 mL option would provide the full 5 mg 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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