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Question:
Dosing instructions for a prescription oral pain medicine call for 0.4 milligrams per kilogram of body weight 2 times per day. If a patient is taking a total dosage of 44.8 mg/day, what is the patient’s weight in kilograms? Round to the nearest kilogram.
A
56 kg.
explanation
121244.8 mg/day means they are taking:
\(\frac{\mathrm{4.48 mg/day} }{\mathrm{2 doses/day}} = 22.4 \frac{\mathrm{mg} }{\mathrm{dose}}\) (22.4 mg twice each day)
\((0.4 mg/kg)(x kg) = 22.4 mg\)
\(0.4x=22.4\)
\(x=\frac{\mathrm{22.4} }{\mathrm{0.4}}\)
\(x=56\)
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