2024 RN HESI Med Surg Dosage Calculations New Latest
Version with All Questions and 100% Correct Answers
Question 1:
The healthcare provider prescribes amoxicillin 500 mg every 8 hours for a child
who weighs 88 pounds. The recommended maximum safe dose is 50
mg/kg/24 hour. The available suspension is labeled, Amoxicillin Suspension
250 mg/5 mL. Based on this child weight, how many mL should the nurse
administer? (Enter numerical value only. (If rounding is required, round to the
whole number.)
Show correct answer and explanation
Explanation
To answer this question, we need to convert the child's weight from pounds to
kilograms, and then calculate the safe dose range and the amount of
suspension needed.
One pound is equal to 0.454 kg, so 88 pounds is equal to 0.454 x 88 = 39.952 kg.
We can round this to 40 kg for simplicity.
The safe dose range is 50 mg/kg/24 hour, so for a 40 kg child, the safe dose
range is 50 x 40 = 2000 mg/24 hour. This means that the child can receive up to
2000 mg of amoxicillin in a day.
The prescription is for 500 mg every 8 hours, which means that the child will
receive three doses in a day, totaling 500 x 3 = 1500 mg. This is within the safe
dose range.
The suspension is labeled, Amoxicillin Suspension 250 mg/5 mL, which means
that every 5 mL of suspension contains 250 mg of amoxicillin. To find out how
many mL of suspension are needed for one dose of 500 mg, we can use a
proportion:
250 mg / 5 mL = 500 mg / x mL
Cross-multiplying and solving for x, we get:
x = (500 x 5) / 250
x = 10 mL
Therefore, the nurse should administer 10 mL of suspension for one dose of 500
mg
Discussion Section
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