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Difficulty: EasyPharmacological Therapies

A practical nurse is preparing to administer phenytoin oral suspension to a client with a seizure disorder. The provider's prescription is for phenytoin 150 mg150\text{ mg} PO every 12 hours. The medication label indicates a concentration of 125 mg/5 mL125\text{ mg}/5\text{ mL}.

How many mL\text{mL} should the nurse administer for one dose? (Record the answer as a whole number. Do not include units in your answer.)

Answer: 6 mL

Answer

6
To calculate the correct volume of medication to administer, the nurse uses the formula: Desired DoseDose on Hand×Quantity\frac{\text{Desired Dose}}{\text{Dose on Hand}} \times \text{Quantity}. Substituting the known values, the calculation is 150 mg125 mg×5 mL=1.2×5 mL=6 mL\frac{150\text{ mg}}{125\text{ mg}} \times 5\text{ mL} = 1.2 \times 5\text{ mL} = 6\text{ mL}. Therefore, the nurse should administer 6 mL6\text{ mL} per dose.

Step-by-Step Solution

1
Identify the known variables for the dosage calculation.
Desired (D) = 150 mg150\text{ mg}, Have (H) = 125 mg125\text{ mg}, Quantity (Q) = 5 mL5\text{ mL}.
Correctly identifying the prescription and medication label information is essential before performing any math.
2
Set up the dosage calculation formula.
150 mg125 mg×5 mL\frac{150\text{ mg}}{125\text{ mg}} \times 5\text{ mL}
Using the standard dimensional analysis or desired-over-have method ensures accurate dose calculation.
3
Perform the mathematical calculation.
1.2×5 mL=6 mL1.2 \times 5\text{ mL} = 6\text{ mL}
Solving the equation provides the final volume to be administered.

Key Concept

Oral Dosage Calculation
Estimated Time:1m 0s
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Topics

Pharmacological Therapies

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