A nurse is preparing to administer phenobarbital 5 mg/kg/day PO divided in equal doses every 12 hr to a client who weighs 54 lb. Available is phenobarbital elixir 20 mg/5 mL. The nurse should administer how many mL per dose? (Round answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
The Correct Answer is ["15.3"]
Step-by-step solution:
1. Convert pounds to kilograms:
1 lb = 0.453592 kg
54 lb x 0.453592 kg/lb = 24.49 kg
2. Calculate the total daily dose of phenobarbital:
Total daily dose = dose per kg/day x weight in kg = 5 mg/kg/day x 24.49 kg = 122.45 mg/day
3. Calculate the dose per administration:
Since the medication is divided into 2 doses per day,
Dose per administration = Total daily dose / number of doses = 122.45 mg/day / 2 doses = 61.225 mg/dose
4. Calculate the volume to administer:
The medication concentration is 20 mg/5 mL, which simplifies to 4 mg/mL.
Volume = Dose per administration / Concentration = 61.225 mg / 4 mg/mL = 15.30625 mL
5. Round to the nearest tenth:
Volume = 15.3 mL
Therefore, the nurse should administer 15.3 mL of phenobarbital per dose.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["3"]
No explanation
Correct Answer is ["4"]
Explanation
The nurse should administer 4 mL of levothyroxine.
Calculations:
Convert 0.4 mg to mcg: 0.4 mg x 1000 mcg/mg = 400 mcg
Desired dose = 400 mcg
Concentration = 100 mcg/mL
Volume = Desired dose / Concentration = 400 mcg / 100 mcg/mL = 4 mL
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