Which frequency is indicated by the abbreviation QID?

The abbreviation QID stands for "quater in die," which is Latin for "four times a day." This indicates that a medication should be administered four times throughout a 24-hour period, typically spaced out evenly to maintain consistent levels of the drug in the body. This frequency is important for medications that require regular dosing to achieve therapeutic effects or to manage symptoms effectively.

In contrast, the other options represent different dosing frequencies: "once a day" is indicated by the abbreviation QD, "twice a day" corresponds to BID, and "three times a day" is represented by TID. Understanding these abbreviations is crucial for proper medication administration and ensuring patient safety.