A nurse is preparing to administer erythromycin 2 g PO daily in equally divided doses every 6 hr. How many mg 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.)

Convert the total daily dose from grams to milligrams. There are 1000 milligrams (mg) in a gram (g), so 2 grams is equal to 2000 milligrams. Since the medication is to be given in equally divided doses every 6 hours, and there are 24 hours in a day, you would divide the total daily dose by 4 (because 24/6 = 4). Therefore, 2000 mg divided by 4 is 500 mg. The nurse should administer 500 mg of erythromycin per dose.