ATI LPN
ATI LPN Pharmacology Exam Questions
Extract:
Question 1 of 5
A nurse is preparing to administer phenobarbital 6 mg/kg/day PO divided in equal doses every 12 hr to a client who weighs 44 lbs. Available is phenobarbital elixir 20 mg/5ml. The nurse should administer how many mL per dose? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use trailing zeros.
Correct Answer: B
Rationale:
To calculate the dose, first convert the client's weight from lbs to kg: 44 lbs / 2.2 = 20 kg.
Then, multiply the weight by the dose: 20 kg x 6 mg/kg/day = 120 mg/day. Since the dose is divided every 12 hours, the nurse should administer 60 mg every 12 hours. Now, determine how many mL of the elixir contain 60 mg: 20 mg/5 mL = 60 mg/x mL. Cross multiply to find x: 20x = 300. Solve for x: x = 300/20 = 15 mL.
Therefore, the correct answer is B: 15 mL. Other choices are incorrect as they do not align with the calculated dose based on the client's weight and the concentration of the elixir.
Question 2 of 5
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Question 3 of 5
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Question 4 of 5
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Question 5 of 5
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