A nurse is preparing to administer acetaminophen 10 mg/kg PO every 4 to 6 hr PRN pain to a toddler who weighs 26.4 lb. Available is acetaminophen liquid 160 mg/5 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.)

To calculate the dosage of acetaminophen for the toddler, first convert the weight from pounds to kilograms, knowing that 1 kg equals 2.2 lbs. The toddler weighs 26.4 lbs, which is approximately 12 kg (26.4 lbs ÷ 2.2 lbs/kg). The prescribed dose is 10 mg/kg, so the toddler's dose is 120 mg (12 kg x 10 mg/kg). Since the available medication is 160 mg/5 mL, divide the dose needed by the concentration to find the volume: 120 mg ÷ (160 mg/5 mL) = 3.75 mL. Therefore, the nurse should administer 3.8 mL per dose, rounding to the nearest tenth.