A patient is prescribed 0.25 mg of a drug. The available injection contains 0.5 mg/mL. What volume should the nurse draw up?
Correct answer: B. 0.5 mL
- A. 0.25 mL
- B. 0.5 mL
- C. 1 mL
- D. 2 mL
Explanation
Use: prescribed dose divided by concentration. 0.25 mg ÷ 0.5 mg/mL = 0.5 mL. Drawing up 1 mL would give 0.5 mg, which is twice the prescribed 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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