An infant who weighs 9 pounds has an order for Kantrex (kanamycin sulfate) 30 mg IV every 12 hours. The literature states that the recommended dosage is 15/kg/day in two divided doses. The vial is labeled 75 mg/2 mL. How many milliliters should the nurse administer per dose? Use the proportion (fractions) method to calculate the amount to give.

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Use the equivalent: 1 kg = 2.2 lb. Convert pounds to kilograms by dividing the number of pounds by 2.2: 9/2.2 = 4.09 kg. Round to the nearest hundredths. Determine the safe dosage range. The literature states that the recommended dosage range is 15 mg/kg/day in two equally divided doses: 15 mg * 4.09 kg = 61.35 mg/day or 30.67 mg per dose. Therefore, 30 mg, q12h, is within the safe dosage range. Use proportion (fractions): 2 mL/75 mg * x mL/30 mg; 75x = 60/75 = 0.8 mL.

An Infant Who Weighs 9 Pounds Has an Order for Kantrex