ATI Dosage Calculation & Safe Medication
Administration MCQs
Name: _________________________ Score: _________________________
1. A nurse is preparing to administer phenytoin 100 mg IV bolus every 8 hours. Available is
phenytoin injection 50 mg/mL. How many mL should the nurse administer per dose?
3 A. 2 mL
B. 3 mL
3 C. 2 mL
D. 1 mL
Explanation: Use the formula: Desired ÷ Have × Quantity. 100 mg ÷ 50 mg × 1 mL = 2 mL.
2. A nurse is preparing to administer cefotaxime 1 g IV bolus every 12 hours. Available is
cefotaxime injection 1 g/50 mL. How many mL should the nurse administer per dose?
A. 2 mL
B. 2 mL
3 C. 50 mL
D. 3 mL
Explanation: The available concentration already provides 1 g in 50 mL, therefore administer 50 mL.
3. A nurse is preparing to administer chlorpromazine 40 mg IM to a client. Available is
chlorpromazine 25 mg/mL. How many mL should the nurse administer?
3 A. 1.6 mL
B. 0.6 mL
C. 0.3 mL
D. 0.5 mL
Explanation: 40 mg ÷ 25 mg × 1 mL = 1.6 mL.
4. A nurse is preparing to administer vasopressin 5 units IM to a client. Available is
vasopressin 20 units/mL. How many mL should the nurse administer?
3 A. 0.25 mL
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B. 0.3 mL
C. 0.5 mL
D. 0.5 mL
Explanation: 5 units ÷ 20 units × 1 mL = 0.25 mL.
