A nurse is preparing to administer phenytoin 15 mg/kg PO to a school-age child who weighs 55 lb. Available is phenytoin suspension 125 mg/5 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 ["15"]
Step-by-step calculation:
The child's weight is 55 lb.
The medication dosage is 15 mg/kg.
The available medication concentration is 125 mg/5 mL.
Calculating the total dose in mg:
Convert the child's weight to kg: 55 lb ÷ 2.2 lb/kg = 25 kg
Calculate the total dose: 25 kg × 15 mg/kg = 375 mg
Calculating the volume to administer:
Use the concentration of the medication: 375 mg ÷ (125 mg/5 mL) = 375 mg ÷ 25 mg/mL = 15 mL
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Related Questions
Correct Answer is ["35"]
Explanation
Step by step calculation:
Calculating the total dose in mg:
Convert the child's weight to kg: 77 lb ÷ 2.2 lb/kg = 35 kg
Calculate the total dose: 35 kg × 40 mg/kg = 1400 mg
Calculating the volume to administer:
Use the concentration of the medication: 1400 mg ÷ 40 mg/mL = 35 mL
Correct Answer is ["3.5"]
Explanation
Convert the child’s weight from pounds to kilograms:
52 lb÷2.2=23.6 kg.
Calculate the total daily dose in micrograms (mcg):
7.5 mcg/kg/day×23.6 kg=177 mcg/day.
Determine the volume in mL to administer:
The elixir concentration is 50 mcg/mL
177 mcg÷50 mcg/mL=3.54 mL.
Round to the nearest tenth:
3.54 rounds to 3.5 mL.
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