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Calculating Drug Dosages: A Patient-
Safe Approach Test Bank 2nd Edition |
Advanced/Hard Difficulty | 100% Pass
Guaranteed | Graded A+
1. The prescriber orders 500 mg of amoxicillin. The available stock is 250 mg/5 mL. How many
milliliters will the nurse administer?
A. 5 mL
B. 10 mL
C. 15 mL
D. 20 mL
Correct Answer: B
Explanation: Desired dose (500 mg) ÷ Available concentration (250 mg/5 mL) = 2. Then multiply
by the quantity (5 mL): 2 × 5 mL = 10 mL. Formula: (Desired ÷ Available) × Quantity = (500 ÷ 250)
× 5 = 2 × 5 = 10 mL.
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2. A patient is prescribed 0.25 mg of digoxin. The available tablets are 0.125 mg each. How
many tablets should the nurse administer?
A. 0.5 tablet
B. 1 tablet
C. 1.5 tablets
D. 2 tablets
Correct Answer: D
Explanation: Desired dose (0.25 mg) ÷ Available per tablet (0.125 mg) = 2 tablets. Formula:
Desired ÷ Available = 0.25 ÷ 0.125 = 2 tablets.
3. The nurse is preparing to administer 40 mg of furosemide IV push. The medication is
available in a vial with a concentration of 10 mg/mL. How many mL will the nurse draw up?
A. 2 mL
B. 4 mL
C. 6 mL
D. 8 mL
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Correct Answer: B
Explanation: Desired dose (40 mg) ÷ Available concentration (10 mg/mL) = 4 mL. Formula: 40
mg ÷ 10 mg/mL = 4 mL.
4. A patient is prescribed 75 mg of meperidine IM. The vial is labeled 50 mg/mL. How many
milliliters will the nurse administer?
A. 0.5 mL
B. 1 mL
C. 1.5 mL
D. 2 mL
Correct Answer: C
Explanation: Desired dose (75 mg) ÷ Available concentration (50 mg/mL) = 1.5 mL. Formula: 75
÷ 50 = 1.5 mL.
5. The order reads: cefazolin 250 mg IM. The reconstituted medication has a concentration of
330 mg/mL. How many mL should the nurse administer?
A. 0.5 mL
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B. 0.75 mL
C. 1 mL
D. 1.5 mL
Correct Answer: B
Explanation: Desired dose (250 mg) ÷ Available concentration (330 mg/mL) = 0.757 mL, rounded
to 0.75 mL. Formula: 250 ÷ 330 = 0.757 ≈ 0.75 mL.
6. A patient is receiving heparin at 1,200 units/hour. The available concentration is 25,000
units in 500 mL of D5W. What is the infusion rate in mL/hour?
A. 20 mL/hour
B. 24 mL/hour
C. 30 mL/hour
D. 40 mL/hour
Correct Answer: B
Explanation: First, determine concentration: 25,000 units ÷ 500 mL = 50 units/mL. Then, divide
desired rate by concentration: 1,200 units/hour ÷ 50 units/mL = 24 mL/hour.
Calculating Drug Dosages: A Patient-
Safe Approach Test Bank 2nd Edition |
Advanced/Hard Difficulty | 100% Pass
Guaranteed | Graded A+
1. The prescriber orders 500 mg of amoxicillin. The available stock is 250 mg/5 mL. How many
milliliters will the nurse administer?
A. 5 mL
B. 10 mL
C. 15 mL
D. 20 mL
Correct Answer: B
Explanation: Desired dose (500 mg) ÷ Available concentration (250 mg/5 mL) = 2. Then multiply
by the quantity (5 mL): 2 × 5 mL = 10 mL. Formula: (Desired ÷ Available) × Quantity = (500 ÷ 250)
× 5 = 2 × 5 = 10 mL.
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2. A patient is prescribed 0.25 mg of digoxin. The available tablets are 0.125 mg each. How
many tablets should the nurse administer?
A. 0.5 tablet
B. 1 tablet
C. 1.5 tablets
D. 2 tablets
Correct Answer: D
Explanation: Desired dose (0.25 mg) ÷ Available per tablet (0.125 mg) = 2 tablets. Formula:
Desired ÷ Available = 0.25 ÷ 0.125 = 2 tablets.
3. The nurse is preparing to administer 40 mg of furosemide IV push. The medication is
available in a vial with a concentration of 10 mg/mL. How many mL will the nurse draw up?
A. 2 mL
B. 4 mL
C. 6 mL
D. 8 mL
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Correct Answer: B
Explanation: Desired dose (40 mg) ÷ Available concentration (10 mg/mL) = 4 mL. Formula: 40
mg ÷ 10 mg/mL = 4 mL.
4. A patient is prescribed 75 mg of meperidine IM. The vial is labeled 50 mg/mL. How many
milliliters will the nurse administer?
A. 0.5 mL
B. 1 mL
C. 1.5 mL
D. 2 mL
Correct Answer: C
Explanation: Desired dose (75 mg) ÷ Available concentration (50 mg/mL) = 1.5 mL. Formula: 75
÷ 50 = 1.5 mL.
5. The order reads: cefazolin 250 mg IM. The reconstituted medication has a concentration of
330 mg/mL. How many mL should the nurse administer?
A. 0.5 mL
, 4
B. 0.75 mL
C. 1 mL
D. 1.5 mL
Correct Answer: B
Explanation: Desired dose (250 mg) ÷ Available concentration (330 mg/mL) = 0.757 mL, rounded
to 0.75 mL. Formula: 250 ÷ 330 = 0.757 ≈ 0.75 mL.
6. A patient is receiving heparin at 1,200 units/hour. The available concentration is 25,000
units in 500 mL of D5W. What is the infusion rate in mL/hour?
A. 20 mL/hour
B. 24 mL/hour
C. 30 mL/hour
D. 40 mL/hour
Correct Answer: B
Explanation: First, determine concentration: 25,000 units ÷ 500 mL = 50 units/mL. Then, divide
desired rate by concentration: 1,200 units/hour ÷ 50 units/mL = 24 mL/hour.
