A nurse is preparing to administer amoxicillin 320 mg PO every 12 hr to an infant. The amount available is amoxicillin suspension 400 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.)

Formula: Volume to administer (mL) = (Desired dose (mg) / Available concentration (mg/mL)) Desired dose = 320 mg Available concentration = 400 mg / 5 mL Calculate the concentration per mL: 400mg / 5mL = 80 mg/mL Apply the formula: Volume to administer = 320 mg / 80 mg/mL =4ml The nurse should administer 4 mL per dose.