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Difficulty: MediumPharmacological Therapies

A practical nurse is caring for a toddler who weighs 1414 kg and is diagnosed with acute otitis media. The healthcare provider prescribes cefdinir 77 mg/kg PO every 1212 hours. The pharmacy dispenses cefdinir oral suspension labeled 125125 mg / 55 mL. How many mL should the nurse administer for one dose? (Record answer to the nearest tenth. Do not include units in answer.)

Answer: 3.9 mL

Answer

3.9
To determine the correct administration volume, first calculate the total desired dose for the child: 1414 kg ×7\times 7 mg/kg = 9898 mg. Next, calculate the volume using the medication concentration provided by the pharmacy. Divide the desired dose (9898 mg) by the available dose (125125 mg), and multiply by the available volume (55 mL): (98/125)×5=3.92(98 / 125) \times 5 = 3.92 mL. Rounding this value to the nearest tenth provides the final answer of 3.93.9.

Step-by-Step Solution

1
Calculate the total milligrams required for a single dose.
14 kg×7 mg/kg=98 mg14 \text{ kg} \times 7 \text{ mg/kg} = 98 \text{ mg}
The prescription is weight-based, requiring the child's weight in kilograms to be multiplied by the ordered amount per kilogram.
2
Determine the volume of suspension needed to provide the desired dose.
98 mg125 mg×5 mL=3.92 mL\frac{98 \text{ mg}}{125 \text{ mg}} \times 5 \text{ mL} = 3.92 \text{ mL}
Applying the dimensional analysis or desired-over-have formula to calculate the liquid volume to administer.
3
Round the final answer to the nearest tenth.
3.93.9
The question explicitly requires rounding to the nearest tenth for administration.

Key Concept

Weight-based pediatric dosage calculation for oral liquid medications
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Topics

Pharmacological Therapies

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