A patient who weighs 154 lb has a medication order for amphotericin B. The dosage of 0.25 mg/kg is to be added to 500 mL of D5W. How much amphotericin B in mg is needed to fill the order?

Rationale

17.5 mg of amphotericin B is needed to fill the order.

To calculate the required dose of amphotericin B, first convert the patient's weight from pounds to kilograms (154 lb ÷ 2.2 = 70 kg). Then, multiply the weight by the dosage (0.25 mg/kg × 70 kg = 17.5 mg).

A (7.5) YOUR ANSWER

This choice represents a miscalculation of the required dosage. It may stem from an incorrect conversion of weight or dosage calculation; however, the correct calculation based on the patient's weight and prescribed dosage clearly yields a higher amount.

B (17.5) CORRECT

This is the correct choice, as it accurately reflects the required dosage. By converting the patient’s weight to kilograms and applying the prescribed dosage of 0.25 mg/kg, the calculation results in 17.5 mg, fulfilling the medication order.

C (75) YOUR ANSWER

This option is significantly higher than the calculated requirement. It may arise from erroneously multiplying the patient's weight in kilograms by a larger factor than the prescribed dosage, leading to an excessive and incorrect dosage calculation.

D (175) YOUR ANSWER

This choice is also incorrect as it greatly exceeds the required amount. It likely results from a misunderstanding of the dosage per kilogram, possibly multiplying the weight by the dosage incorrectly or misinterpreting the units entirely.

Conclusion

Accurate medication dosing is critical for patient safety and efficacy. In this case, the calculation of 17.5 mg of amphotericin B is based on the patient's weight converted into kilograms and the specific dosage prescribed. Recognizing the correct application of dosage calculations prevents potential dosing errors, ensuring the patient receives the correct treatment.

A patient who weighs 154 lb has a medication order for amphotericin B. The dosage of 0.25 mg/kg is to be added to 500 mL of D5W. How much amphotericin B in mg is needed to fill the order?

17.5 mg of amphotericin B is needed to fill the order.

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