A nurse is preparing to administer ampicillin 50 mg/kg/day divided equally every 6 hr to a child who weighs 30 kg (66 lb). Available is ampicillin oral suspension 125 mg/5 mL. How many mL should the nurse administer per dose? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Calculate the total daily dose based on weight Total Daily Dose = 50 mg/kg × 30 kg = 1,500 mg/day Divide the total daily dose by the number of doses per day Doses per day = every 6 hours → 24 ÷ 6 = 4 doses/day Dose per administration = 1,500 ÷ 4 = 375 mg per dose Calculate the volume to administer per dose Available Concentration: 125 mg/5 mL → 125 mg in 5 mL Volume to administer = (Dose per Administration ÷ Available Dose) × Volume = (375 ÷ 125) × 5 = 3 × 5 = 15 mL