A patient is prescribed 140 mg of an oral medicine. The liquid contains 80 mg in 2 mL. What volume should the nurse administer?
Correct answer: C. 3.5 mL
- A. 2.8 mL
- B. 3.0 mL
- C. 3.5 mL
- D. 4.0 mL
Explanation
First calculate the concentration: 80 mg ÷ 2 mL = 40 mg/mL. Then calculate 140 mg ÷ 40 mg/mL = 3.5 mL. A volume of 2.8 mL would provide only 112 mg.
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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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