NR 226 DOSAGE CALCULATIONS – High-Yield Notes
& Practice Questions | 2026/2027 Complete Med Math
Mastery Pack with 200+ Step-by-Step Problems & Solutions
1. The order is amoxicillin 1 g PO. The pharmacy sends 500 mg capsules. How many
capsules should be given?
a) 1 capsule
b) 2 capsules
c) 3 capsules
d) 4 capsules
Rationale: 1 g = 1000 mg. 1000 ÷ 500 = 2 capsules.
2. A patient is prescribed 500 mg of liquid medication. The available concentration is 250
mg/5 mL. How many mL should the nurse administer?
a) 5 mL
b) 10 mL
c) 15 mL
d) 20 mL
Rationale: 500 mg ÷ 250 mg = 2 × 5 mL = 10 mL.
3.
4. A patient needs heparin 5,000 units subcutaneously. The vial reads 10,000 units/mL.
How many mL should the nurse draw up?
a) 0.25 mL
b) 0.5 mL
c) 0.75 mL
d) 1 mL
Rationale: 5,000 ÷ 10,000 = 0.5 mL.
,5. The IV bag contains 40 mEq of potassium chloride in 1000 mL of D5W. The patient is to
receive 20 mEq. How many mL should be infused?
a) 250 mL
b) 500 mL
c) 750 mL
d) 1000 mL
Rationale: 20/40 = 0.5 × 1000 mL = 500 mL.
6. An order reads: furosemide 40 mg IV push. The vial is labeled 10 mg/mL. How many mL
should the nurse administer?
a) 2 mL
b) 4 mL
c) 6 mL
d) 8 mL
Rationale: 40 mg ÷ 10 mg/mL = 4 mL.
7. A child weighs 66 lb. Convert weight to kg.
a) 20 kg
b) 30 kg
c) 40 kg
d) 50 kg
Rationale: 66 lb ÷ 2.2 = 30 kg.
8. The order is digoxin 0.125 mg PO. The tablet strength is 0.25 mg. How many tablets
should be given?
a) 0.25 tablet
b) 0.5 tablet
c) 1 tablet
d) 2 tablets
Rationale: 0.125 ÷ 0.25 = 0.5 tablet.
, 9. A patient is to receive 1000 mL of NS over 8 hours. The drop factor is 15 gtt/mL.
Calculate the flow rate in gtt/min.
a) 24 gtt/min
b) 31 gtt/min
c) 42 gtt/min
d) 56 gtt/min
Rationale: 1000 mL ÷ 8 hr = 125 mL/hr. 125 × 15 ÷ 60 = 31.25 ≈ 31 gtt/min.
10. The order is metoprolol 25 mg PO daily. Available: 50 mg scored tablets. How many
tablets?
a) 0.25 tablet
b) 0.5 tablet
c) 1 tablet
d) 1.5 tablets
Rationale: 25 ÷ 50 = 0.5 tablet.
11. IV fluid is infusing at 42 gtt/min. The drop factor is 20 gtt/mL. How many mL/hr is the
patient receiving?
a) 84 mL/hr
b) 126 mL/hr
c) 160 mL/hr
d) 210 mL/hr
Rationale: 42 gtt/min ÷ 20 gtt/mL = 2.1 mL/min × 60 = 126 mL/hr.
12. A patient requires 2 L of oxygen via nasal cannula. How many mL/min is that?
a) 1000 mL/min
b) 2000 mL/min
c) 3000 mL/min
d) 4000 mL/min
Rationale: 2 L × 1000 = 2000 mL/min.
& Practice Questions | 2026/2027 Complete Med Math
Mastery Pack with 200+ Step-by-Step Problems & Solutions
1. The order is amoxicillin 1 g PO. The pharmacy sends 500 mg capsules. How many
capsules should be given?
a) 1 capsule
b) 2 capsules
c) 3 capsules
d) 4 capsules
Rationale: 1 g = 1000 mg. 1000 ÷ 500 = 2 capsules.
2. A patient is prescribed 500 mg of liquid medication. The available concentration is 250
mg/5 mL. How many mL should the nurse administer?
a) 5 mL
b) 10 mL
c) 15 mL
d) 20 mL
Rationale: 500 mg ÷ 250 mg = 2 × 5 mL = 10 mL.
3.
4. A patient needs heparin 5,000 units subcutaneously. The vial reads 10,000 units/mL.
How many mL should the nurse draw up?
a) 0.25 mL
b) 0.5 mL
c) 0.75 mL
d) 1 mL
Rationale: 5,000 ÷ 10,000 = 0.5 mL.
,5. The IV bag contains 40 mEq of potassium chloride in 1000 mL of D5W. The patient is to
receive 20 mEq. How many mL should be infused?
a) 250 mL
b) 500 mL
c) 750 mL
d) 1000 mL
Rationale: 20/40 = 0.5 × 1000 mL = 500 mL.
6. An order reads: furosemide 40 mg IV push. The vial is labeled 10 mg/mL. How many mL
should the nurse administer?
a) 2 mL
b) 4 mL
c) 6 mL
d) 8 mL
Rationale: 40 mg ÷ 10 mg/mL = 4 mL.
7. A child weighs 66 lb. Convert weight to kg.
a) 20 kg
b) 30 kg
c) 40 kg
d) 50 kg
Rationale: 66 lb ÷ 2.2 = 30 kg.
8. The order is digoxin 0.125 mg PO. The tablet strength is 0.25 mg. How many tablets
should be given?
a) 0.25 tablet
b) 0.5 tablet
c) 1 tablet
d) 2 tablets
Rationale: 0.125 ÷ 0.25 = 0.5 tablet.
, 9. A patient is to receive 1000 mL of NS over 8 hours. The drop factor is 15 gtt/mL.
Calculate the flow rate in gtt/min.
a) 24 gtt/min
b) 31 gtt/min
c) 42 gtt/min
d) 56 gtt/min
Rationale: 1000 mL ÷ 8 hr = 125 mL/hr. 125 × 15 ÷ 60 = 31.25 ≈ 31 gtt/min.
10. The order is metoprolol 25 mg PO daily. Available: 50 mg scored tablets. How many
tablets?
a) 0.25 tablet
b) 0.5 tablet
c) 1 tablet
d) 1.5 tablets
Rationale: 25 ÷ 50 = 0.5 tablet.
11. IV fluid is infusing at 42 gtt/min. The drop factor is 20 gtt/mL. How many mL/hr is the
patient receiving?
a) 84 mL/hr
b) 126 mL/hr
c) 160 mL/hr
d) 210 mL/hr
Rationale: 42 gtt/min ÷ 20 gtt/mL = 2.1 mL/min × 60 = 126 mL/hr.
12. A patient requires 2 L of oxygen via nasal cannula. How many mL/min is that?
a) 1000 mL/min
b) 2000 mL/min
c) 3000 mL/min
d) 4000 mL/min
Rationale: 2 L × 1000 = 2000 mL/min.
