A physician writes a prescription for amoxicillin PO 50 mg/kg/day in three divided doses for a 2-year old patient weighing 25 lb. Amoxicillin is available in a 125 mg/5 mL suspension. A single dose dispensed in an oral syringe would contain:

Rationale

Each single dose dispensed in an oral syringe would contain 150 mg/6 mL.

To determine the correct dosage, we first convert the child's weight from pounds to kilograms (25 lb is approximately 11.34 kg). The total daily dose of amoxicillin is calculated as 50 mg/kg/day, resulting in 567 mg per day, which is divided into three doses of 189 mg each. Knowing that the suspension is 125 mg/5 mL, we can find that 189 mg corresponds to 6 mL of the suspension.

A (140 mg/5 mL) YOUR ANSWER

This choice miscalculates the amount of amoxicillin in the prescribed dose. The concentration of the suspension indicates that 5 mL contains 125 mg, and thus, 140 mg would require a greater volume than 5 mL, making this answer incorrect.

B (150 mg/6 mL) CORRECT

This choice accurately reflects the calculated single dose of 189 mg, which converts to approximately 6 mL of the amoxicillin suspension. This is the correct answer as it aligns with the calculated total daily dose divided into three doses.

C (190 mg/7.6 mL) YOUR ANSWER

While this option is close to the required dose, it overestimates the amount of amoxicillin needed in a single dose. The calculation should yield approximately 6 mL, not 7.6 mL, making this choice incorrect.

D (417 mg/3.4 mL) YOUR ANSWER

This choice presents an unrealistic dosage based on the concentration of the suspension, as 3.4 mL would only provide around 85 mg of amoxicillin. This option does not match the prescription requirements and is therefore incorrect.

Conclusion

The correct dosage of amoxicillin for the 2-year-old patient, based on weight and the available suspension concentration, is 150 mg in a 6 mL dose. Understanding how to calculate dosages accurately is crucial in pediatric medicine to ensure safe and effective treatment. The other choices fail to provide the correct quantity or volume needed for the prescribed medication.

A physician writes a prescription for amoxicillin PO 50 mg/kg/day in three divided doses for a 2-year old patient weighing 25 lb. Amoxicillin is available in a 125 mg/5 mL suspension. A single dose dispensed in an oral syringe would contain:

Each single dose dispensed in an oral syringe would contain 150 mg/6 mL.

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