A nurse is preparing to administer cefazolin 40 mg/kg/day IV bolus divided in equal doses every 12 hr to a neonate who weighs 5 kg. Available is cefazolin injection 330 mg/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.)

Calculate the total daily dose in milligrams (mg). Total daily dose (mg) = Desired dose (mg/kg/day) × Weight (kg) = 40 mg/kg/day × 5 kg = 200 mg/day. Calculate the dose per administration in milligrams (mg). Number of doses per day = 24 hr / 12 hr = 2 doses. Dose per administration (mg) = Total daily dose (mg) / Number of doses per day = 200 mg / 2 doses = 100 mg. Available concentration of the cefazolin injection = 330 mg/mL. Calculate the volume in milliliters (mL) to administer per dose. Volume per dose (mL) = Desired dose per administration (mg) / Available concentration (mg/mL) = 100 mg / 330 mg/mL = 0.303 mL. Round the answer to the nearest tenth. = 0.3 mL.