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Mr. Doran is prescribed methotrexate. The dosage range of the medication for his condition is 0.625-2.5 mg/kg/day. If he weighs 165 lb, what is the range, in mg, that Mr. Doran can safely take?

A. 23 - 93 mg
B. 47 - 187 mg
C. 94 - 374 mg
D. 103 - 412 mg

Answer :

Final answer:

After converting Mr. Doran's weight from pounds to kilograms, the calculation shows he can safely take a daily methotrexate dosage ranging from 47 to 187 mg, which corresponds to option B of the provided choices.

Explanation:

Mr. Doran's prescribed dosage range of methotrexate for his condition is 0.625-2.5 mg/kg/day. Given that he weighs 165 pounds, we will first need to convert his weight into kilograms. There are approximately 0.453592 kilograms in a pound. Therefore, Mr. Doran's weight in kilograms is:

165 lb × 0.453592 kg/lb = 74.84308 kg

Now, using the lower end of the dosage range:

0.625 mg/kg/day × 74.84308 kg = 46.7773 mg/day

And using the higher end of the dosage range:

2.5 mg/kg/day × 74.84308 kg = 187.1077 mg/day

Therefore, rounding to the nearest whole number, Mr. Doran can safely take a range of 47 - 187 mg of methotrexate per day, which corresponds to option B.

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