NCLEX RN Dosage Calculations
Practice Exam 1 100 Questions Plus
Correct Answers (Verified Answers)
Plus Rationales 2026
1. A nurse is preparing to administer amoxicillin 500 mg PO. The available
capsules contain 250 mg each. How many capsules should the nurse
administer?
A. 0.5 capsule
B. 1 capsule
C. 2 capsules
D. 4 capsules
Answer: 2 capsules
Rationale: Desired dose ÷ dose available = 500 mg ÷ 250 mg = 2 capsules.
2. The provider prescribes acetaminophen 650 mg PO. The medication is
available as 325 mg tablets. How many tablets should the nurse administer?
A. 0.5 tablet
B. 1 tablet
C. 2 tablets
D. 3 tablets
Answer: 2 tablets
Rationale: 650 mg ÷ 325 mg/tablet = 2 tablets.
3. A patient is prescribed furosemide 40 mg PO. The tablets available are 20
mg each. How many tablets should the nurse administer?
A. 1 tablet
B. 2 tablets
C. 3 tablets
,D. 4 tablets
Answer: 2 tablets
Rationale: 40 mg ÷ 20 mg/tablet = 2 tablets.
4. The nurse needs to administer morphine 6 mg IV. The vial contains 10
mg/mL. How many mL should the nurse administer?
A. 0.4 mL
B. 0.5 mL
C. 0.6 mL
D. 1 mL
Answer: 0.6 mL
Rationale: 6 mg ÷ 10 mg/mL = 0.6 mL.
5. A prescription reads potassium chloride 30 mEq PO. The solution contains
20 mEq/15 mL. How many mL should the nurse administer?
A. 15 mL
B. 20 mL
C. 22.5 mL
D. 30 mL
Answer: 22.5 mL
Rationale: (30 mEq ÷ 20 mEq) × 15 mL = 22.5 mL.
6. A patient is prescribed 1,000 mL of 0.9% sodium chloride to infuse over 8
hours. What rate should the IV pump be programmed to deliver?
A. 100 mL/hr
B. 125 mL/hr
C. 150 mL/hr
D. 175 mL/hr
Answer: 125 mL/hr
Rationale: 1,000 mL ÷ 8 hr = 125 mL/hr.
7. An IV infusion contains 500 mL and is prescribed to infuse over 4 hours.
What is the infusion rate?
, A. 100 mL/hr
B. 125 mL/hr
C. 150 mL/hr
D. 200 mL/hr
Answer: 125 mL/hr
Rationale: 500 mL ÷ 4 hr = 125 mL/hr.
8. The provider prescribes cefazolin 750 mg IV. The reconstituted medication
contains 1 g/10 mL. How many mL should the nurse administer?
A. 5 mL
B. 7.5 mL
C. 8 mL
D. 10 mL
Answer: 7.5 mL
Rationale: 750 mg = 0.75 g. (0.75 g ÷ 1 g) × 10 mL = 7.5 mL.
9. A patient weighs 154 lb. What is the patient's weight in kilograms?
A. 60 kg
B. 65 kg
C. 70 kg
D. 75 kg
Answer: 70 kg
Rationale: 154 lb ÷ 2.2 lb/kg = 70 kg.
10. A medication is prescribed at 5 mg/kg for a patient weighing 60 kg. What
dose should the nurse administer?
A. 100 mg
B. 200 mg
C. 300 mg
D. 600 mg
Answer: 300 mg
Rationale: 5 mg/kg × 60 kg = 300 mg.
Practice Exam 1 100 Questions Plus
Correct Answers (Verified Answers)
Plus Rationales 2026
1. A nurse is preparing to administer amoxicillin 500 mg PO. The available
capsules contain 250 mg each. How many capsules should the nurse
administer?
A. 0.5 capsule
B. 1 capsule
C. 2 capsules
D. 4 capsules
Answer: 2 capsules
Rationale: Desired dose ÷ dose available = 500 mg ÷ 250 mg = 2 capsules.
2. The provider prescribes acetaminophen 650 mg PO. The medication is
available as 325 mg tablets. How many tablets should the nurse administer?
A. 0.5 tablet
B. 1 tablet
C. 2 tablets
D. 3 tablets
Answer: 2 tablets
Rationale: 650 mg ÷ 325 mg/tablet = 2 tablets.
3. A patient is prescribed furosemide 40 mg PO. The tablets available are 20
mg each. How many tablets should the nurse administer?
A. 1 tablet
B. 2 tablets
C. 3 tablets
,D. 4 tablets
Answer: 2 tablets
Rationale: 40 mg ÷ 20 mg/tablet = 2 tablets.
4. The nurse needs to administer morphine 6 mg IV. The vial contains 10
mg/mL. How many mL should the nurse administer?
A. 0.4 mL
B. 0.5 mL
C. 0.6 mL
D. 1 mL
Answer: 0.6 mL
Rationale: 6 mg ÷ 10 mg/mL = 0.6 mL.
5. A prescription reads potassium chloride 30 mEq PO. The solution contains
20 mEq/15 mL. How many mL should the nurse administer?
A. 15 mL
B. 20 mL
C. 22.5 mL
D. 30 mL
Answer: 22.5 mL
Rationale: (30 mEq ÷ 20 mEq) × 15 mL = 22.5 mL.
6. A patient is prescribed 1,000 mL of 0.9% sodium chloride to infuse over 8
hours. What rate should the IV pump be programmed to deliver?
A. 100 mL/hr
B. 125 mL/hr
C. 150 mL/hr
D. 175 mL/hr
Answer: 125 mL/hr
Rationale: 1,000 mL ÷ 8 hr = 125 mL/hr.
7. An IV infusion contains 500 mL and is prescribed to infuse over 4 hours.
What is the infusion rate?
, A. 100 mL/hr
B. 125 mL/hr
C. 150 mL/hr
D. 200 mL/hr
Answer: 125 mL/hr
Rationale: 500 mL ÷ 4 hr = 125 mL/hr.
8. The provider prescribes cefazolin 750 mg IV. The reconstituted medication
contains 1 g/10 mL. How many mL should the nurse administer?
A. 5 mL
B. 7.5 mL
C. 8 mL
D. 10 mL
Answer: 7.5 mL
Rationale: 750 mg = 0.75 g. (0.75 g ÷ 1 g) × 10 mL = 7.5 mL.
9. A patient weighs 154 lb. What is the patient's weight in kilograms?
A. 60 kg
B. 65 kg
C. 70 kg
D. 75 kg
Answer: 70 kg
Rationale: 154 lb ÷ 2.2 lb/kg = 70 kg.
10. A medication is prescribed at 5 mg/kg for a patient weighing 60 kg. What
dose should the nurse administer?
A. 100 mg
B. 200 mg
C. 300 mg
D. 600 mg
Answer: 300 mg
Rationale: 5 mg/kg × 60 kg = 300 mg.
