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 1 of 3
- A. 1 tablet
- B. 2 tablets
- C. 3 tablets
- D. 4 tablets
Explanation: Use the formula: prescribed dose divided by dose per tablet. 500 mg ÷ 250 mg = 2 tablets.
Correct answer: 2 tablets- A. 10 mL
- B. 12 mL
- C. 15 mL
- D. 20 mL
Explanation: First calculate the volume per milligram: 375 mg × 5 mL ÷ 125 mg = 15 mL.
Correct answer: 15 mL- A. 75 mg
- B. 250 mg
- C. 750 mg
- D. 7,500 mg
Explanation: One gram equals 1,000 milligrams. Therefore, 0.75 g × 1,000 = 750 mg. The decimal must be moved three places to the right when converting…
Correct answer: 750 mg- A. 5.5 mL
- B. 7.5 mL
- C. 10 mL
- D. 15 mL
Explanation: Calculate the dose first: 15 kg × 10 mg/kg = 150 mg. Then calculate the volume: 150 mg × 5 mL ÷ 100 mg = 7.5 mL.
Correct answer: 7.5 mL- A. 24 drops/min
- B. 31 drops/min
- C. 38 drops/min
- D. 45 drops/min
Explanation: Use: volume × drop factor ÷ time in minutes. 1,000 × 15 ÷ 480 minutes = 31.25 drops/minute, which is rounded to 31 drops/minute.
Correct answer: 31 drops/min- A. 100 mL/hour
- B. 125 mL/hour
- C. 150 mL/hour
- D. 200 mL/hour
Explanation: Use the formula: total volume divided by infusion time. 500 mL ÷ 4 hours = 125 mL/hour.
Correct answer: 125 mL/hour- A. 2 mg/mL
- B. 10 mg/mL
- C. 20 mg/mL
- D. 200 mg/mL
Explanation: A 2% w/v solution contains 2 g in 100 mL. Converting 2 g to 2,000 mg and dividing by 100 mL gives 20 mg/mL.
Correct answer: 20 mg/mL- A. 0.5 mg
- B. 5 mg
- C. 50 mg
- D. 500 mg
Explanation: One gram equals 1,000 mg, so 1 g in 1,000 mL equals 1 mg/mL. In 5 mL, the amount is 5 mL × 1 mg/mL = 5 mg.
Correct answer: 5 mg- 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.
Correct answer: 0.5 mL- A. 2 hours
- B. 4 hours
- C. 5 hours
- D. 10 hours
Explanation: Use: total volume divided by infusion rate. 250 mL ÷ 50 mL/hour = 5 hours.
Correct answer: 5 hours- A. 1 tablet
- B. 2 tablets
- C. 3 tablets
- D. 4 tablets
Explanation: First convert 0.4 mg to 400 micrograms. Then divide 400 micrograms by 200 micrograms per tablet, giving 2 tablets.
Correct answer: 2 tablets- A. 4.5 mL
- B. 5 mL
- C. 5.5 mL
- D. 6 mL
Explanation: The daily dose is 24 × 22 = 528 mg. Each dose is 528 ÷ 4 = 132 mg, and 132 × 5 ÷ 120 = 5.5 mL.
Correct answer: 5.5 mL- A. 1 g
- B. 4 g
- C. 8 g
- D. 10 g
Explanation: A 4% w/v solution contains 4 g in every 100 mL. For 250 mL, the amount is 4 × 250 ÷ 100 = 10 g.
Correct answer: 10 g- A. 2 mL
- B. 2.5 mL
- C. 3 mL
- D. 4 mL
Explanation: The concentration is 1,000 mg ÷ 5 mL = 200 mg/mL. The required volume is 600 mg ÷ 200 mg/mL = 3 mL.
Correct answer: 3 mL- A. 0.1 mg/mL
- B. 1 mg/mL
- C. 10 mg/mL
- D. 100 mg/mL
Explanation: A 1:1,000 ratio means 1 g in 1,000 mL. Converting 1 g to 1,000 mg gives 1,000 mg ÷ 1,000 mL = 1 mg/mL.
Correct answer: 1 mg/mL- A. 180 mL/hour
- B. 216 mL/hour
- C. 288 mL/hour
- D. 360 mL/hour
Explanation: Thirty-six drops in 30 seconds equals 72 drops per minute. The rate is 72 ÷ 15 = 4.8 mL/minute, and 4.8 × 60 = 288 mL/hour.
Correct answer: 288 mL/hour- A. 7 hours 40 minutes
- B. 8 hours 20 minutes
- C. 8 hours 40 minutes
- D. 9 hours 20 minutes
Explanation: The remaining volume is 1,000 − 350 = 650 mL. At 75 mL/hour, 650 ÷ 75 = 8.67 hours, which is 8 hours and 40 minutes.
Correct answer: 8 hours 40 minutes- A. 0.68 mL
- B. 1.02 mL
- C. 1.5 mL
- D. 10.2 mL
Explanation: The prescribed dose is 0.15 × 68 = 10.2 mg. At 10 mg/mL, the volume is 10.2 ÷ 10 = 1.02 mL.
Correct answer: 1.02 mL- A. 0.75 mL
- B. 1 mL
- C. 1.5 mL
- D. 2.5 mL
Explanation: The concentration is 25,000 ÷ 5 = 5,000 units/mL. The required volume is 7,500 ÷ 5,000 = 1.5 mL.
Correct answer: 1.5 mL- A. 20 mL
- B. 22 mL
- C. 200 mL
- D. 220 mL
Explanation: The prescribed amount is 220 mL, so the nurse measures to the 220 mL mark.
Correct answer: 220 mLDrug Calculations and Dosage MCQs: common questions
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