A nurse is preparing to administer nafcillin 25 mg/kg/day IM divided in equal doses every 12 hr to a school-age child who weighs 83 lb. Available is nafcillin injection 250 mg/ml. How many mL should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
The Correct Answer is ["1.9"]
Identify the given information:
Dose of nafcillin: 25 mg/kg/day
Weight of the child: 83 lb
Concentration of nafcillin injection: 250 mg/mL
Convert the child's weight from pounds to kilograms:
1 lb ≈ 0.453592 kg
Calculate the total daily dose of nafcillin in mg:
Total daily dose = Dose/kg/day x Weight (kg)
Substitute the values:
Total daily dose = 25 mg/kg/day x 83 lb x (0.453592 kg/1 lb)
Total daily dose ≈ 936.82 mg
Calculate the dose per dose (every 12 hours):
Dose per dose = Total daily dose / 2
Substitute the values:
Dose per dose = 936.82 mg / 2
Dose per dose ≈ 468.41 mg
Calculate the volume of nafcillin injection to be administered:
Volume = Dose per dose (mg) / Concentration (mg/mL)
Substitute the values:
Volume = 468.41 mg / 250 mg/mL
Volume ≈ 1.87 mL
Round the answer to the nearest tenth:
Volume ≈ 1.9 mL
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Related Questions
Correct Answer is ["3"]
Explanation
Identify the given information:
Dose of azithromycin: 10 mg/kg
Weight of the toddler: 27 lb
Concentration of azithromycin suspension: 200 mg/5 mL
Convert the toddler's weight from pounds to kilograms:
1 lb ≈ 0.453592 kg
Calculate the total dose of azithromycin in mg:
Total dose = Dose/kg x Weight (kg)
Substitute the values:
Total dose = 10 mg/kg x 27 lb x (0.453592 kg/1 lb)
Calculate the result:
Total dose ≈ 122.47 mg
Calculate the volume of azithromycin suspension to be administered:
Volume = Total dose (mg) / Concentration (mg/mL)
Substitute the values:
Volume = 122.47 mg / (200 mg/5 mL)
Calculate the result:
Volume ≈ 3.06 mL
Round the answer to the nearest whole number:
Volume ≈ 3 mL
Correct Answer is ["1.5"]
Explanation
Identify the given information:
Dose of iron dextran: 75 mg
Concentration of iron dextran: 50 mg/mL
Calculate the volume of iron dextran to be administered:
Volume = Dose (mg) / Concentration (mg/mL)
Substitute the values:
Volume = 75 mg / 50 mg/mL
Volume = 1.5 mL
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