A nurse is preparing to administer aspirin 650 mg PO every 12 hours. The amount available is aspirin 325 mg tablets. How many tablets should the nurse administer? —

Step 1 is: Determine the number of milligrams needed per dose. 650 mg per dose. Step 2 is: Determine the number of milligrams available per tablet. 325 mg per tablet. Step 3 is: Calculate the number of tablets to administer. 650 mg ÷ (325 mg/tablet) = 2 tablets. The nurse should administer 2 tablets.