The initial dosage of a drug is 5 mg/kg of body weight. If a patient weighs 185 lb, what is the total initial dose, in mg?

Rationale

Total initial dose is 420 mg.

To calculate the initial dose based on body weight, the patient's weight in kilograms must first be determined. Since the patient weighs 185 lb, converting this to kilograms gives approximately 84 kg. Multiplying this by the dosage of 5 mg/kg results in a total initial dose of 420 mg.

A (81.4) YOUR ANSWER

This choice reflects an incorrectly calculated value. It appears to be derived from an incorrect conversion or dosage calculation. The appropriate conversion from pounds to kilograms does not support this dosage for a patient weighing 185 lb.

B (185) YOUR ANSWER

This option suggests using the weight in pounds directly as the dose, which is incorrect. The dosage of 5 mg/kg requires the patient's weight to be converted into kilograms before the dosage can be calculated, rendering this choice invalid.

C (420) CORRECT

This is the correct choice, as it results from the proper calculations. First, converting 185 lb to kilograms gives approximately 84 kg. Multiplying this by the prescribed dosage of 5 mg/kg yields 420 mg, which is the total initial dose.

D (925) YOUR ANSWER

This choice likely results from a calculation error, possibly multiplying the weight in pounds by the dosage incorrectly. The correct approach involves converting the weight to kilograms and applying the dosage per kilogram, which does not support this higher total.

Conclusion

The total initial dose of the drug for a patient weighing 185 lb is accurately calculated as 420 mg. By converting the patient's weight to kilograms and utilizing the dosage of 5 mg per kilogram, we achieve the correct dosage needed for effective treatment. Incorrect choices stem from misunderstandings in weight conversion or dosage application, underscoring the importance of accurate calculations in pharmacology.

The initial dosage of a drug is 5 mg/kg of body weight. If a patient weighs 185 lb, what is the total initial dose, in mg?

Total initial dose is 420 mg.

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