Which abbreviation denotes four times a day?

• A. BID
• B. TID
• C. QID
• D. PRN

Answer: (C)

Understanding prescription dosing abbreviations helps ensure medications are taken at intervals that maintain steady levels in the body. QID denotes four times a day, coming from the Latin quater in die, meaning four doses within one day. This schedule is typically spaced about six hours apart, though exact times may vary based on the prescription and patient routine.

Twice daily is indicated by BID, and three times daily by TID, while PRN means the medication is taken as needed rather than on a fixed schedule. Therefore, QID is the abbreviation that specifically represents taking the dose four times in one day.