Free Drug Calculations and Dosage MCQs with Answers
50 Drug Calculations and Dosage MCQs from Nursing Pharmacology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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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50 questions · page 3 of 3
- A. 8.4 mL
- B. 10.2 mL
- C. 11.2 mL
- D. 12.4 mL
Explanation: Convert the weight first: 154 lb ÷ 2.2 = 70 kg. The required dose is 70 × 4 = 280 mg, and 280 mg ÷ 25 mg/mL = 11.2 mL.
Correct answer: 11.2 mL- A. 0.3 g
- B. 3 g
- C. 30 g
- D. 300 g
Explanation: A 5% w/v solution contains 5 g in every 100 mL. Therefore, 5 g × 60 ÷ 100 = 3 g in 60 mL.
Correct answer: 3 g- A. 0.32 mg
- B. 3.2 mg
- C. 32 mg
- D. 320 mg
Explanation: One gram equals 1,000 mg, so the concentration is 1,000 mg ÷ 2,500 mL = 0.4 mg/mL. In 8 mL, the amount is 0.4 × 8 = 3.2 mg.
Correct answer: 3.2 mg- A. 30 drops per minute
- B. 35 drops per minute
- C. 40 drops per minute
- D. 45 drops per minute
Explanation: Use: drops per minute = volume × drop factor ÷ time in minutes. The calculation is 840 × 20 ÷ 420 minutes = 40 drops per minute.
Correct answer: 40 drops per minute- A. 4 hours
- B. 5 hours
- C. 6 hours
- D. 7 hours
Explanation: Infusion time equals total volume divided by the hourly rate: 750 mL ÷ 125 mL/hour = 6 hours.
Correct answer: 6 hours- 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.
Correct answer: 4 mL- A. 1.5 mL
- B. 2 mL
- C. 2.5 mL
- D. 3 mL
Explanation: The concentration after reconstitution is 600 mg ÷ 4 mL = 150 mg/mL. The required volume is 375 mg ÷ 150 mg/mL = 2.5 mL.
Correct answer: 2.5 mL- A. 1 mL
- B. 1.5 mL
- C. 2 mL
- D. 2.5 mL
Explanation: The vial contains 1,200,000 units ÷ 3 mL = 400,000 units/mL. Therefore, 800,000 units ÷ 400,000 units/mL = 2 mL.
Correct answer: 2 mL- A. 0.018 mL
- B. 0.18 mL
- C. 1.8 mL
- D. 18 mL
Explanation: Use the formula: volume = prescribed dose ÷ concentration. Thus, 18 units ÷ 100 units/mL = 0.18 mL.
Correct answer: 0.18 mL- A. 5.63 mL/hour
- B. 11.25 mL/hour
- C. 18.75 mL/hour
- D. 22.50 mL/hour
Explanation: First calculate the dose: 5 micrograms × 60 kg = 300 micrograms/minute, or 18 mg/hour.
Correct answer: 11.25 mL/hour