Final answer:
The patient will need a total of 21 tablets of captopril 25 mg to comply with the doctor's order of three tablets per day for seven days.
Step-by-step explanation:
The doctor's order states: captopril 25 mg PO (by mouth) t.i.d. (three times a day) for 7 days. If each tablet is 25 milligrams, we can calculate the total number of tablets needed by multiplying the number of doses per day by the number of days.
Number of tablets needed per day = 3 (since t.i.d. means three times a day)
Number of days = 7
Therefore, the total number of tablets needed for 7 days is:
Total tablets = Number of tablets per day * Number of days
Total tablets = 3 tablets/day * 7 days
Total tablets = 21 tablets