A nurse is preparing to administer phenytoin 15 mg/kg PO to a school-age child who weighs 55 lb. Available is phenytoin suspension 125 mg/5 mL How many mL should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Step-by-step calculation: The child's weight is 55 lb. The medication dosage is 15 mg/kg. The available medication concentration is 125 mg/5 mL. Calculating the total dose in mg: Convert the child's weight to kg: 55 lb ÷ 2.2 lb/kg = 25 kg Calculate the total dose: 25 kg × 15 mg/kg = 375 mg Calculating the volume to administer: Use the concentration of the medication: 375 mg ÷ (125 mg/5 mL) = 375 mg ÷ 25 mg/mL = 15 mL