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NUR 3145 – Pharmacology: Drug Calculations Practice Exam Questions and Correct Answers (V, Exams of Nursing

Western Carolina University (WCU)Nursing

NUR 3145 – Pharmacology: Drug Calculations Practice Exam Questions and Correct Answers (Verified Answers) Plus Rationales 2025

Typology: Exams

2024/2025

Available from 06/23/2025

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NUR 3145 – Pharmacology: Drug Calculations
Practice Exam Questions and Correct Answers
(Verified Answers) Plus Rationales 2025
1. A provider orders ampicillin 500 mg IM every 6 hours. Available: ampicillin 1
g/2 mL. How many mL will you administer?
1 mL
1 g = 1000 mg, so 500 mg = 0.5 g. If 1 g is in 2 mL, then 0.5 g = 1
mL.
2. Order: Heparin 7500 units SC. Available: Heparin 10,000 units/mL. How many
mL should be administered?
0.75 mL
7500 ÷ 10,000 = 0.75 mL.
3. Doctor orders 1000 mL of IV fluids to infuse over 8 hours. Drop factor is 20
gtt/mL. What is the flow rate in gtt/min?
42 gtt/min
(1000 mL × 20) ÷ (8 × 60) = 42 gtt/min.
4. Administer lorazepam 2 mg IV. Available: 4 mg/mL. How many mL will you
give?
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NUR 3145 – Pharmacology: Drug Calculations

Practice Exam Questions and Correct Answers

(Verified Answers) Plus Rationales 2025

  1. A provider orders ampicillin 500 mg IM every 6 hours. Available: ampicillin 1 g/2 mL. How many mL will you administer? 1 mL

1 g = 1000 mg, so 500 mg = 0.5 g. If 1 g is in 2 mL, then 0.5 g = 1

mL.

  1. Order: Heparin 7500 units SC. Available: Heparin 10,000 units/mL. How many mL should be administered? 0.75 mL

7500 ÷ 10,000 = 0.75 mL.

  1. Doctor orders 1000 mL of IV fluids to infuse over 8 hours. Drop factor is 20 gtt/mL. What is the flow rate in gtt/min? 42 gtt/min

(1000 mL × 20) ÷ (8 × 60) = 42 gtt/min.

  1. Administer lorazepam 2 mg IV. Available: 4 mg/mL. How many mL will you give?

0.5 mL

2 ÷ 4 = 0.5 mL.

  1. Order: 0.25 mg digoxin PO daily. Available: 0.125 mg tablets. How many tablets will you give? 2 tablets

0.25 ÷ 0.125 = 2 tablets.

  1. A child weighs 44 lbs. Ordered dose: 10 mg/kg/day. What is the total daily dose? 200 mg/day

44 lbs = 20 kg. 20 kg × 10 mg = 200 mg.

  1. Give acetaminophen 650 mg. Available: 325 mg/tablet. How many tablets will you administer? 2 tablets

650 ÷ 325 = 2 tablets.

  1. IV order: 1500 mL over 12 hours. What is the hourly rate on an infusion pump? 125 mL/hr

1500 ÷ 12 = 125 mL/hr.

  1. Doctor orders 2 mg morphine IV every 4 hours PRN. Available: 10 mg/mL. How many mL per dose? 0.2 mL

2 ÷ 10 = 0.2 mL.

3 tablets

0.3 ÷ 0.1 = 3 tablets.

  1. Patient weighs 10 kg. Ordered: 15 mg/kg/day in 3 divided doses. What is the dose per dose? 50 mg

15 × 10 = 150; 150 ÷ 3 = 50 mg.

  1. The order is 30 mEq potassium chloride. Available: 20 mEq/15 mL. How many mL? 22.5 mL

(30 ÷ 20) × 15 = 22.5 mL.

  1. The label reads 250 mg/5 mL. The provider orders 500 mg. How many mL will you give? 10 mL

500 ÷ 250 = 2; 2 × 5 = 10 mL.

  1. Administer 60 mg prednisone. Available: 20 mg tablets. How many tablets? 3 tablets

60 ÷ 20 = 3 tablets.

  1. Doctor orders 0.4 g of a medication. Available: 200 mg tablets. How many tablets? 2 tablets

0.4 g = 400 mg; 400 ÷ 200 = 2 tablets.

  1. You have a vial labeled 50 mg/mL. Administer 75 mg. How many mL? 1.5 mL

75 ÷ 50 = 1.5 mL.

  1. Administer 1.5 g ampicillin. Available: 500 mg/mL. How many mL? 3 mL

1.5 g = 1500 mg; 1500 ÷ 500 = 3 mL.

  1. A 20 kg child needs 4 mg/kg/day in divided doses every 6 hours. Dose per dose? 20 mg

20 × 4 = 80 mg/day; 80 ÷ 4 = 20 mg/dose.

  1. Infuse 250 mL over 2 hours. What is the rate on the pump? 125 mL/hr

250 ÷ 2 = 125 mL/hr.

  1. Order: 0.6 mg of med. Available: 0.3 mg/tablet. How many tablets? 2 tablets

0.6 ÷ 0.3 = 2 tablets.

  1. Doctor orders 1.2 g of a med. Available: 600 mg tablets. How many tablets? 2 tablets

1.2 g = 1200 mg; 1200 ÷ 600 = 2 tablets.

  1. Administer 0.45 g medication. Available: 150 mg/mL. How many mL? 3 mL

0.45 g = 450 mg; 450 ÷ 150 = 3 mL.

  1. Ordered 100 mg. Supplied: 50 mg/2 mL. How many mL? 4 mL

100 ÷ 50 = 2 doses; 2 × 2 = 4 mL.

  1. You have 0.25 mg tablets. Order: 0.75 mg. How many tablets? 3 tablets

0.75 ÷ 0.25 = 3 tablets.

  1. Patient weighs 132 lbs. Dose: 8 mg/kg/day in 2 doses. Dose per dose? 240 mg

132 lbs = 60 kg; 60 × 8 = 480; 480 ÷ 2 = 240 mg.

  1. Doctor orders 2 g ceftriaxone IV. Available: 1 g/10 mL. How many mL? 20 mL

2 ÷ 1 = 2; 2 × 10 = 20 mL.

  1. IV med: 100 mg in 50 mL over 30 min. What is pump rate? 100 mL/hr

50 ÷ 0.5 hr = 100 mL/hr.

  1. Order: 1.5 L over 10 hrs. How many mL/hr? 150 mL/hr

1500 ÷ 10 = 150 mL/hr.

  1. You have 0.5 mg/mL. Order: 0.25 mg. How many mL? 0.5 mL

0.25 ÷ 0.5 = 0.5 mL.

  1. IV order: 250 mL over 2.5 hrs. Pump setting? 100 mL/hr

250 ÷ 2.5 = 100 mL/hr.

  1. Ordered: 75 mg. Available: 25 mg/mL. How many mL? 3 mL

75 ÷ 25 = 3 mL.

  1. Dose: 1.2 g. Available: 400 mg/2 mL. How many mL? 6 mL

1.2 g = 1200 mg; 1200 ÷ 400 = 3 doses; 3 × 2 = 6 mL.

  1. Doctor orders 250 mg. You have 100 mg/mL. How many mL? 2.5 mL

250 ÷ 100 = 2.5 mL.

  1. Give 40 mEq KCl in 100 mL over 4 hours. Pump rate? 25 mL/hr

100 ÷ 4 = 25 mL/hr.

  1. IV: 500 mL NS over 2 hours. Drop factor 10 gtt/mL. gtt/min? 42 gtt/min

500 × 10 ÷ 120 = 41.6 ≈ 42 gtt/min.

  1. Order: 0.6 mg. Have: 0.2 mg tablets. How many tablets? 3 tablets

0.6 ÷ 0.2 = 3 tablets.

  1. IV order: 2 L over 16 hours. What is the rate in mL/hr? 125 mL/hr

2000 ÷ 16 = 125 mL/hr.

  1. A client is to receive 1000 mL over 8 hours. Drop factor is 10 gtt/mL. gtt/min? 21 gtt/min

1000 × 10 ÷ 480 = 20.8 ≈ 21 gtt/min.

  1. A child weighs 22 kg. Order: 10 mg/kg/day in 2 doses. How many mg per dose? 110 mg

22 × 10 = 220; 220 ÷ 2 = 110 mg.

  1. Ordered: 0.3 g. Available: 100 mg/mL. How many mL? 3 mL

0.3 g = 300 mg; 300 ÷ 100 = 3 mL.

  1. Order: 50 mg. Available: 25 mg/mL. How many mL? 2 mL

50 ÷ 25 = 2 mL.

  1. Ordered: 2 tablets of metformin 500 mg. How many mg will the patient receive? 1000 mg

2 × 500 = 1000 mg.

  1. IV infusion: 1 L over 5 hours. Pump rate? 200 mL/hr

1000 ÷ 5 = 200 mL/hr.

  1. Give 2.5 mg hydromorphone IV. Available: 1 mg/mL. How many mL? 2.5 mL

2.5 ÷ 1 = 2.5 mL.

  1. Order: 0.05 mg. Available: 0.025 mg tablets. How many tablets? 2 tablets

0.05 ÷ 0.025 = 2 tablets.

  1. Order: 3000 units of heparin. Available: 1000 units/mL. How many mL? 3 mL

3000 ÷ 1000 = 3 mL.

  1. Order: 2 g. Available: 250 mg tablets. How many tablets? 8 tablets

2 g = 2000 mg; 2000 ÷ 250 = 8 tablets.

  1. Order: 125 mcg. Available: 0.25 mg tablets. How many tablets? 0.5 tablet

0.25 mg = 250 mcg; 125 ÷ 250 = 0.5 tablet.

  1. Order: 400 mg. Available: 200 mg tablets. How many tablets? 2 tablets

400 ÷ 200 = 2 tablets.

  1. A 60 kg child needs 30 mg/kg/day divided into 3 doses. How many mg per dose? 600 mg

60 × 30 = 1800; 1800 ÷ 3 = 600 mg.

  1. Order: 200 mg. Available: 50 mg tablets. How many tablets? 4 tablets

200 ÷ 50 = 4 tablets.

  1. Infuse 125 mL over 1 hour using 60 gtt/mL set. How many gtt/min? 125 gtt/min

125 × 60 ÷ 60 = 125 gtt/min.

  1. Order: 0.6 g. Available: 300 mg tablets. How many tablets? 2 tablets

0.6 g = 600 mg; 600 ÷ 300 = 2 tablets.

  1. Patient needs 120 mEq. Available: 40 mEq/15 mL. How many mL? 45 mL

120 ÷ 40 = 3; 3 × 15 = 45 mL.

  1. Order: 600 mg ibuprofen. Available: 200 mg tablets. How many tablets? 3 tablets

600 ÷ 200 = 3 tablets.

  1. Ordered: 1.5 g. Available: 750 mg tablets. How many tablets? 2 tablets

1.5 g = 1500 mg; 1500 ÷ 750 = 2 tablets.

  1. Order: 0.25 g. Available: 125 mg tablets. How many tablets? 2 tablets

0.25 g = 250 mg; 250 ÷ 125 = 2 tablets.

  1. Doctor orders 1 g. Available: 500 mg/mL. How many mL? 2 mL

1 g = 1000 mg; 1000 ÷ 500 = 2 mL.

  1. Patient weighs 40 kg. Dose: 5 mg/kg/dose. How many mg per dose? 200 mg

40 × 5 = 200 mg.

  1. Order: 0.5 mL. Available: 1:1000 epinephrine. How many mg? 0.5 mg

1:1000 = 1 mg/mL; 0.5 mL = 0.5 mg.

  1. Infuse 600 mL over 4 hours. Rate? 150 mL/hr

600 ÷ 4 = 150 mL/hr.

  1. Order: 0.9 g. Available: 300 mg/5 mL. How many mL? 15 mL

0.9 g = 900 mg; 900 ÷ 300 = 3; 3 × 5 = 15 mL.

  1. Dose: 1 mg/kg. Weight: 88 lbs. How many mg? 40 mg

88 lbs = 40 kg; 1 × 40 = 40 mg.

  1. Doctor orders 60 mg. Available: 20 mg/mL. How many mL? 3 mL

60 ÷ 20 = 3 mL.

  1. Ordered: 2 L over 10 hours. mL/hr? 200 mL/hr

2000 ÷ 10 = 200 mL/hr.

  1. Order: 1.8 g. Available: 600 mg/5 mL. How many mL? 15 mL

1.8 g = 1800 mg; 1800 ÷ 600 = 3; 3 × 5 = 15 mL.

  1. Order: 325 mg acetaminophen. Available: 160 mg/5 mL. How many mL? 10.2 mL

325 ÷ 160 = 2.03; 2.03 × 5 = 10.2 mL.

  1. A 15 kg child requires 10 mg/kg. How many mg? 150 mg

15 × 10 = 150 mg.

  1. Doctor orders 450 mg. Available: 150 mg tablets. How many tablets? 3 tablets

450 ÷ 150 = 3 tablets.