A medication vial contains a powdered drug labeled 'Add 2.0 mL of sterile water for injection to yield 500 mg/mL. How many milliliters should you administer to provide a dose of 250 mg?
1.0 mL
0.5 mL
1.5 mL
2.0 mL
The Correct Answer is B
Available Concentration: 500 mg/mL
Ordered Dose: 250 mg
- Calculate the volume to administer
Volume to administer = Ordered Dose ÷ Concentration
Volume to administer = 250 ÷ 500
Volume to administer = 0.5 mL
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. 20 mL: Twenty milliliters is equivalent to 4 teaspoons. Administering this amount would double the prescribed dose and could lead to medication overdose and adverse effects.
B. 10 mL: One teaspoon equals 5 mL, so 2 teaspoons equal 10 mL. This conversion is standard in clinical practice and ensures accurate and safe medication dosing.
C. 15 mL: Fifteen milliliters is equivalent to 3 teaspoons. Using this amount would exceed the prescribed dose and increase the risk of medication-related harm.
D. 5 mL: Five milliliters equals 1 teaspoon. Administering this amount would provide only half of the prescribed dose, leading to underdosing and reduced therapeutic effect.
Correct Answer is B
Explanation
Calculation:
Ordered Dose: 0.25 mg
Available Tablet Strength: 0.125 mg
- Calculate the number of tablets
Number of Tablets = Dose ÷ Tablet Strength
Number of Tablets = 0.25 ÷ 0.125
Number of Tablets = 2 tablets
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