A nurse is preparing to administer phenytoin 2.5 mg/kg IV bolus to a school-age child who weighs 66 lb. Available is phenytoin injection 50 mg/mL. How many mL should the nurse administer? (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 (lbs) to kilograms (kg): Formula: Weight in kg = Weight in lbs / 2.2 lbs/kg = 66 lbs / 2.2 lbs/kg = 30 kg Calculate the total dose of phenytoin needed in milligrams: Ordered dose: 2.5 mg/kg Child's weight in kg: 30 kg Formula: Total dose (mg) = Ordered dose (mg/kg) × Child's weight (kg) = 2.5 mg/kg × 30 kg = 75 mg Determine the concentration of the available phenytoin injection: Available concentration: 50 mg/mL Calculate the volume of phenytoin to administer: Formula: Volume to administer (mL) = Desired dose (mg) / Concentration (mg/mL) = 75 mg / 50 mg/mL = 1.5 mL