Questions: A nurse is preparing to administer phenytoin 5 mg / kg / day PO divided equally every 12 hr for an infant who weighs 12 lb 4 oz. How many mg 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.) mg

A nurse is preparing to administer phenytoin 5 mg / kg / day PO divided equally every 12 hr for an infant who weighs 12 lb 4 oz. How many mg 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.) mg
Transcript text: https://student.atitesting.com/Assessment Dosage Calculation 4.0 Dosage by Weight Test CLOSE Question: 15 of 25 Time Elapsed: 00:17:12 ■ FLAG A nurse is preparing to administer phenytoin $5 \mathrm{mg} / \mathrm{kg} /$ day PO divided equally every 12 hr for an infant who weighs 12 lb 4 oz . How many mg 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.) $\square$ mg PREVIOUS CONTINUE
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Solution

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Solution Steps

To solve this problem, we need to follow these steps:

  1. Convert the infant's weight from pounds and ounces to kilograms.
  2. Calculate the total daily dosage in milligrams using the given dosage per kilogram.
  3. Divide the total daily dosage by the number of doses per day to find the dosage per administration.
Step 1: Convert Weight to Kilograms

First, we convert the infant's weight from pounds and ounces to kilograms. Given:

  • \( \text{pounds} = 12 \)
  • \( \text{ounces} = 4 \)

We know that:

  • \( 1 \text{ pound} = 16 \text{ ounces} \)
  • \( 1 \text{ ounce} = 0.02835 \text{ kilograms} \)

So, the total weight in ounces is: \[ \text{total\_ounces} = 12 \times 16 + 4 = 196 \text{ ounces} \]

Then, convert the total ounces to kilograms: \[ \text{weight\_kg} = 196 \times 0.02835 = 5.5565 \text{ kg} \]

Step 2: Calculate Total Daily Dosage

The dosage prescribed is \( 5 \text{ mg/kg/day} \). Therefore, the total daily dosage in milligrams is: \[ \text{total\_daily\_dosage\_mg} = 5 \times 5.5565 = 27.7825 \text{ mg} \]

Step 3: Calculate Dosage Per Administration

The medication is to be administered every 12 hours, which means there are 2 doses per day. Thus, the dosage per administration is: \[ \text{dosage\_per\_dose\_mg} = \frac{27.7825}{2} = 13.8913 \text{ mg} \]

Rounding to the nearest tenth: \[ \text{dosage\_per\_dose\_mg} \approx 13.9 \text{ mg} \]

Final Answer

The nurse should administer: \[ \boxed{13.9 \text{ mg}} \] per dose.

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