Dosage Calculations Mastery Test Bank – 150 Fully
Solved Practice Items Answers And Rationale
Included (2025/2026)
1. A patient is prescribed 500 mg of amoxicillin every 8 hours. The
available supply is 250 mg tablets. How many tablets should the
patient take per dose?
2 tablets
Rationale: Each tablet contains 250 mg. Required dose = 500 mg.
500 ÷ 250 = 2 tablets.
2. An order reads: Give 0.2 g of medication. You have vials labeled
100 mg/mL. How many mL will you administer?
2 mL
Rationale: Convert grams to mg: 0.2 g = 200 mg. Available: 100
mg/mL. Volume = 200 ÷ 100 = 2 mL.
3. A physician orders 1,500 units of heparin subcutaneously. The
label reads 5,000 units/mL. How many mL will you administer?
0.3 mL
Rationale: Dose ÷ concentration = 1,500 ÷ 5,000 = 0.3 mL.
4. You are to administer 250 mg of a drug. The vial contains 100
mg/mL. How many mL will you give?
2.5 mL
Rationale: Volume = Dose ÷ Concentration = 250 ÷ 100 = 2.5 mL.
5. A patient needs 0.5 g of ceftriaxone. The supply is 250 mg per vial.
How many vials are needed?
2 vials
, Rationale: 0.5 g = 500 mg. Each vial = 250 mg. 500 ÷ 250 = 2
vials.
6. The order is for digoxin 0.125 mg. Available: 0.25 mg tablets. How
many tablets should you give?
0.5 tablet
Rationale: Dose ÷ tablet strength = 0.125 ÷ 0.25 = 0.5 tablet.
7. An order is for 1 mg/kg of a drug for a 70 kg patient. The available
concentration is 2 mg/mL. How many mL should you administer?
35 mL
Rationale: Dose = 1 mg × 70 kg = 70 mg. Volume = 70 ÷ 2 = 35
mL.
8. A child weighing 20 kg is prescribed amoxicillin 40 mg/kg/day
divided into 3 doses. How many mg per dose?
266.7 mg per dose
Rationale: Total daily dose = 20 × 40 = 800 mg. Divided by 3
doses: 800 ÷ 3 ≈ 266.7 mg per dose.
9. The physician orders 10 units of insulin. The vial concentration is
100 units/mL. How many mL will you administer?
0.1 mL
Rationale: Volume = 10 ÷ 100 = 0.1 mL.
10. A patient is prescribed 75 mg of medication. Tablets are
available in 25 mg. How many tablets will you give?
3 tablets
Rationale: Dose ÷ tablet strength = 75 ÷ 25 = 3 tablets.
11. You need to administer 0.4 mg of digoxin. Available tablets:
0.25 mg. How many tablets will you give?
1.6 tablets
Rationale: 0.4 ÷ 0.25 = 1.6 tablets.
, 12. A patient requires 1.2 g of a drug. Supply: 600 mg per tablet.
How many tablets should you administer?
2 tablets
Rationale: 1.2 g = 1,200 mg. 1,200 ÷ 600 = 2 tablets.
13. Order: Morphine 2 mg IV. Supply: 4 mg/mL. How many mL
will you give?
0.5 mL
Rationale: Volume = 2 ÷ 4 = 0.5 mL.
14. A prescription reads: Cephalexin 250 mg PO q6h. Available:
125 mg/5 mL. How many mL per dose?
10 mL
Rationale: Each 5 mL = 125 mg. Required 250 mg. 250 ÷ 125 × 5
mL = 10 mL.
15. A patient weighs 55 kg. The order is for 5 mg/kg/day of a
medication divided into 2 doses. How many mg per dose?
137.5 mg
Rationale: Total daily dose = 55 × 5 = 275 mg. Divided by 2 =
137.5 mg per dose.
16. A patient requires 0.75 g of medication. Available: 250 mg
per tablet. How many tablets should you give?
3 tablets
Rationale: 0.75 g = 750 mg. 750 ÷ 250 = 3 tablets.
17. An IV order reads: 500 mL D5W to run over 4 hours.
Calculate the mL/hr.
125 mL/hr
Rationale: Rate = Total volume ÷ Time = 500 ÷ 4 = 125 mL/hr.
18. A physician orders 20 mg of furosemide IV. Supply: 10
mg/mL. How many mL will you give?
Solved Practice Items Answers And Rationale
Included (2025/2026)
1. A patient is prescribed 500 mg of amoxicillin every 8 hours. The
available supply is 250 mg tablets. How many tablets should the
patient take per dose?
2 tablets
Rationale: Each tablet contains 250 mg. Required dose = 500 mg.
500 ÷ 250 = 2 tablets.
2. An order reads: Give 0.2 g of medication. You have vials labeled
100 mg/mL. How many mL will you administer?
2 mL
Rationale: Convert grams to mg: 0.2 g = 200 mg. Available: 100
mg/mL. Volume = 200 ÷ 100 = 2 mL.
3. A physician orders 1,500 units of heparin subcutaneously. The
label reads 5,000 units/mL. How many mL will you administer?
0.3 mL
Rationale: Dose ÷ concentration = 1,500 ÷ 5,000 = 0.3 mL.
4. You are to administer 250 mg of a drug. The vial contains 100
mg/mL. How many mL will you give?
2.5 mL
Rationale: Volume = Dose ÷ Concentration = 250 ÷ 100 = 2.5 mL.
5. A patient needs 0.5 g of ceftriaxone. The supply is 250 mg per vial.
How many vials are needed?
2 vials
, Rationale: 0.5 g = 500 mg. Each vial = 250 mg. 500 ÷ 250 = 2
vials.
6. The order is for digoxin 0.125 mg. Available: 0.25 mg tablets. How
many tablets should you give?
0.5 tablet
Rationale: Dose ÷ tablet strength = 0.125 ÷ 0.25 = 0.5 tablet.
7. An order is for 1 mg/kg of a drug for a 70 kg patient. The available
concentration is 2 mg/mL. How many mL should you administer?
35 mL
Rationale: Dose = 1 mg × 70 kg = 70 mg. Volume = 70 ÷ 2 = 35
mL.
8. A child weighing 20 kg is prescribed amoxicillin 40 mg/kg/day
divided into 3 doses. How many mg per dose?
266.7 mg per dose
Rationale: Total daily dose = 20 × 40 = 800 mg. Divided by 3
doses: 800 ÷ 3 ≈ 266.7 mg per dose.
9. The physician orders 10 units of insulin. The vial concentration is
100 units/mL. How many mL will you administer?
0.1 mL
Rationale: Volume = 10 ÷ 100 = 0.1 mL.
10. A patient is prescribed 75 mg of medication. Tablets are
available in 25 mg. How many tablets will you give?
3 tablets
Rationale: Dose ÷ tablet strength = 75 ÷ 25 = 3 tablets.
11. You need to administer 0.4 mg of digoxin. Available tablets:
0.25 mg. How many tablets will you give?
1.6 tablets
Rationale: 0.4 ÷ 0.25 = 1.6 tablets.
, 12. A patient requires 1.2 g of a drug. Supply: 600 mg per tablet.
How many tablets should you administer?
2 tablets
Rationale: 1.2 g = 1,200 mg. 1,200 ÷ 600 = 2 tablets.
13. Order: Morphine 2 mg IV. Supply: 4 mg/mL. How many mL
will you give?
0.5 mL
Rationale: Volume = 2 ÷ 4 = 0.5 mL.
14. A prescription reads: Cephalexin 250 mg PO q6h. Available:
125 mg/5 mL. How many mL per dose?
10 mL
Rationale: Each 5 mL = 125 mg. Required 250 mg. 250 ÷ 125 × 5
mL = 10 mL.
15. A patient weighs 55 kg. The order is for 5 mg/kg/day of a
medication divided into 2 doses. How many mg per dose?
137.5 mg
Rationale: Total daily dose = 55 × 5 = 275 mg. Divided by 2 =
137.5 mg per dose.
16. A patient requires 0.75 g of medication. Available: 250 mg
per tablet. How many tablets should you give?
3 tablets
Rationale: 0.75 g = 750 mg. 750 ÷ 250 = 3 tablets.
17. An IV order reads: 500 mL D5W to run over 4 hours.
Calculate the mL/hr.
125 mL/hr
Rationale: Rate = Total volume ÷ Time = 500 ÷ 4 = 125 mL/hr.
18. A physician orders 20 mg of furosemide IV. Supply: 10
mg/mL. How many mL will you give?
