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Difficulty: EasyPharmacological and Parenteral Therapies

A client diagnosed with community-acquired pneumonia is scheduled to receive a 0.5-gram0.5\text{-gram} dose of oral amoxicillin. The unit medication supply contains a liquid suspension with a concentration of 250 mg/5 mL250\text{ mg}/5\text{ mL}. How many milliliters must the nurse administer to provide the required dose?

  1. A
    2 mL2\text{ mL}
  2. B
    5 mL5\text{ mL}
  3. 10 mL10\text{ mL}Answer
  4. D
    1 mL1\text{ mL}

Answer

The nurse should administer 10 mL10\text{ mL} of the oral suspension.
The correct volume is 10 mL10\text{ mL}. To find this, the prescribed dose of 0.5 g0.5\text{ g} is first converted to 500 mg500\text{ mg}. Using the dosage formula (Desired/Have)×Quantity(Desired / Have) \times Quantity, the calculation is (500 mg/250 mg)×5 mL(500\text{ mg} / 250\text{ mg}) \times 5\text{ mL}, which equals 10 mL10\text{ mL}.

Step-by-Step Solution

1
Convert the prescribed dose from grams to milligrams.
0.5 g=500 mg0.5\text{ g} = 500\text{ mg}
The available medication concentration is measured in milligrams, so the units must match before performing the calculation.
2
Apply the standard dosage formula: (Desired/Have)×Quantity(Desired / Have) \times Quantity.
(500 mg/250 mg)×5 mL=10 mL(500\text{ mg} / 250\text{ mg}) \times 5\text{ mL} = 10\text{ mL}
This determines the exact fluid volume needed to deliver the required mass of the medication.

Key Concept

Basic Dosage Calculation and Metric Conversions
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Topics

Pharmacological and Parenteral Therapies

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