Certified Paraoptometric (CPO) Practice Exam 2025

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What does "Tid" indicate regarding medication frequency?

Once a day
Twice a day
Three times daily
Four times a day

The correct answer is: Three times daily

The term "Tid," derived from the Latin "ter in die," means "three times a day." This is a common abbreviation used in medical prescriptions to indicate the frequency with which a medication should be taken. It helps ensure that patients dose their medications consistently and correctly throughout the day, typically evenly spaced to maintain therapeutic levels in the body. The other choices refer to different dosing frequencies, which are represented by different terms; for instance, "once a day" is often denoted as "QD" or simply "daily," "twice a day" is represented as "BID," and "four times a day" is labeled as "QID." Recognizing these abbreviations is important for proper medication management.