An infant who weighs 22 lbs. receives a prescription for amoxicillin 20 mg/kg/day PO in divided doses every 8 hours. The bottle is labeled, "Amoxicillin for Oral Suspension, USP 250 mg per 5 mL." How many mL should the nurse administer with each dose? (Enter numerical value only. If rounding is necessary, round to the nearest tenth.)

Convert the infant's weight from pounds (lb) to kilograms (kg). Given weight = 22 lb Conversion factor = 1 kg = 2.2 lb Weight (kg) = (Weight in lb / 2.2 lb/kg) = (22 / 2.2) = 10 kg. Calculate the total daily dose in milligrams (mg/day). Prescribed dose = 20 mg/kg/day Total Daily Dose (mg/day) = Weight (kg) x Dose (mg/kg/day) = 10 kg x 20 mg/kg/day = 200 mg/day. Calculate the single dose in milligrams (mg/dose). Frequency = every 8 hours (3 doses per day) Single Dose (mg/dose) = (Total Daily Dose / Number of doses per day) = (200 mg / 3) = 66.67 mg. Calculate the volume in milliliters (mL) to administer per dose. Available concentration = 250 mg per 5 mL Volume (mL/dose) = (Single Dose (mg) / Available concentration (mg)) x Available volume (mL) = (66.67 mg / 250 mg) x 5 mL = 1.333... mL. Round the answer to the nearest tenth. = 1.3 mL.