A nurse is preparing to administer nafcillin 500 mg IM to a client.
The amount available is nafcillin 1 g powder.
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.). mL.
The Correct Answer is ["2 mL"]
Step 1 is to find out how many mg are in 1 mL after reconstitution. This is done by dividing the total amount of mg available (1000 mg) by the total volume in mL after reconstitution (3.4 mL). So, 1000 mg ÷ 3.4 mL = 294.12 mg/mL. Step 2 is to find out how many mL are needed to get 500 mg. This is done by dividing the required amount in mg (500 mg) by the concentration in mg/mL (294.12 mg/mL). So, 500 mg ÷ 294.12 mg/mL = 1.7 mL. So the correct answer is 2 mL (rounded to the nearest whole number).
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale:
Meloxicam 15 mg PO daily is a standard dose for treating osteoarthritis and rheumatoid arthritis.
Choice B rationale:
Regular insulin 8 units subcutaneous before meals is a typical dose for managing blood glucose levels in diabetes.
Choice C rationale:
Docusate sodium 200 mg PO at bedtime is a common dose for preventing constipation.
Choice D rationale:
Fentanyl 25 mcg/hr transdermal patch is a potent opioid, and the dose should be carefully monitored. If the client has not been on opioid therapy, this dose might be too high.
Correct Answer is ["1.5 mL"]
Explanation
Step 1 is to determine the amount of medication needed. The order is for 30 mg and the available medication is 20 mg/mL. So, we calculate 30 mg ÷ 20 mg/mL = 1.5 mL. Rounded to the nearest tenth, this is 1.5 mL. So the correct answer is 1.5 mL.
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