Which of the following abbreviations indicates a daily dosage?

The abbreviation that indicates a daily dosage is "QD," which stands for "quaque die" in Latin, meaning "once a day." This term is commonly used in medical prescriptions to specify that a medication should be taken once every day. Understanding this abbreviation is crucial for ensuring proper medication administration and adherence to prescribed treatment plans.

The other terms refer to different dosing schedules: "QH" indicates every hour and is used when a medication needs to be taken very frequently; "QID" means four times a day, used for medications that require more frequent dosing; and "PRN" signifies "as needed," which does not specify a regular dosage schedule but instead indicates that medication should be taken only when required.