Final answer:
The total daily dose of Aspirin the patient will receive is 243 mg, which is calculated by multiplying 1.5 (the number of 81 mg tablets needed for one dose of 120 mg) by 2 for the BID dosing frequency.
Step-by-step explanation:
The prescribed dosage is Aspirin 120 mg PO BID, which means twice a day. The pharmacy provides Aspirin 81 mg tablets. To find the total daily dose in milligrams, you multiply the number of doses per day by the amount of each dose.
To achieve a 120 mg dose from 81 mg tablets, a patient would need 1.5 tablets (120 / 81 = 1.4815, rounded to the nearest 10th gives you 1.5 tablets). Since the prescribed dose is BID (twice daily), the patient needs to take this amount twice.
Therefore, the patient would take a total of 3 tablets daily (1.5 tablets per dose × 2 doses per day). The total daily dose is 3 tablets × 81 mg per tablet, which is 243 mg.