How many total doses is a patient required to take in a 10-day period if instructed to take a medication "1 tab tid?"

To determine the total doses a patient is required to take in a 10-day period when instructed to take a medication "1 tab tid," we break down the instruction given. "Tid" stands for "ter in die," which is Latin for three times a day. Therefore, if the patient is instructed to take one tablet three times a day, we can calculate the total doses as follows:

1. Calculate the daily doses: 1 tablet x 3 (times a day) = 3 tablets per day.

2. Multiply the daily tablets by the number of days: 3 tablets/day x 10 days = 30 tablets.

Thus, the patient will take a total of 30 doses over the 10-day period, making the correct answer C.