Which abbreviation indicates medication should be taken once daily?

The abbreviation that indicates medication should be taken once daily is "QD," which stands for "quaque die" in Latin, meaning "once a day." This term is used in medical prescriptions to clearly convey to patients and healthcare providers that the medication should only be administered one time during the entire day. It is crucial for ensuring proper dosing schedules and medication adherence.

In contrast, other abbreviations signify different dosing frequencies. "BID" stands for "bis in die," which means "twice a day," indicating that the medication should be taken two times a day. "TID," which means "three times a day," suggests more frequent administration. Finally, "QID," or "quater in die," indicates that a medication should be taken four times a day. Understanding these abbreviations helps in the proper administration of medications and ensures that patients follow the prescribed dosing regimen as intended.