A nurse is preparing to administer phenytoin 5 mg/kg/day IV bolus divided in equal doses every 12 hr to a school-age child who weighs 53 lb. Available is phenytoin injection 50 mg/mL. How many mL should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

Calculation: Convert the child's weight from pounds (lb) to kilograms (kg) using the conversion factor of 2.2 lb/kg. Patient's weight in kg = 53 lb / 2.2 lb/kg = 24.0909 kg. Calculate the total daily dose in milligrams (mg) for the child. Total daily dose = Ordered dose (mg/kg/day) × Patient's weight (kg) = 5 mg/kg/day × 24.0909 kg = 120.4545 mg/day. Calculate the dose per administration (every 12 hr, which is 2 doses per day). Dose per administration = Total daily dose (mg/day) / 2 doses/day = 120.4545 mg / 2 = 60.2272 mg/dose. Available concentration = 50 mg/mL. Calculate the volume in milliliters (mL) to administer per dose. Volume (mL) = Dose per administration (mg) / Available concentration (mg/mL) = 60.2272 mg / 50 mg/mL = 1.2045 mL. Round the answer to the nearest tenth. = 1.2 mL.