The package insert instructs reconstituting with 3.4 mL of sterile water to yield nafcillin 250 mg/mL. How many mL should the nurse administer?
(Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
The Correct Answer is ["2"]
Step 1 is to determine the amount of medication in 1 mL after reconstitution. This is calculated by dividing the total available medication (1000 mg) by the total volume after reconstitution (3.4 mL):
1000 mg ÷ 3.4 mL = 294.12 mg/mL
Step 2 is to determine how many mL are needed to obtain 500 mg. This is done by dividing the required dose (500 mg) by the concentration (294.12 mg/mL):
500 mg ÷ 294.12 mg/mL = 1.7 mL
Rounding to the nearest whole number, the correct amount to administer is 2 mL.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["10"]
Explanation
Step 1 is to calculate the volume to administer. The volume is 775 mg ÷ (400 mg/5 mL) = 9.6875 mL.
So, the correct answer is 10 mL after rounding to the nearest whole number.
Correct Answer is ["3"]
Explanation
Step 1 is to determine the total amount of medication needed. The doctor ordered 300 mg of phenytoin and each capsule contains 100 mg. So, we divide the total amount ordered by the amount per capsule: 300 mg ÷ 100 mg/capsule = 3 capsules.
So, the correct answer is 3 capsules.
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