What does the symbol "QD" mean in medication instructions?

The symbol "QD" stands for "quaque die," which is Latin for "once a day." This shorthand is commonly used in medication instructions to indicate that a medication should be taken one time within a 24-hour period. Understanding this abbreviation is crucial for accurate medication administration and ensuring patient safety, as dosing at the correct interval directly impacts the effectiveness of the treatment.

The other choices describe different dosing schedules that are not represented by the abbreviation "QD." For instance, "every week" would suggest a less frequent interval, while "every other day" implies a two-day cycle between doses. "Four times a day" indicates a much more frequent dosage, which is not aligned with the meaning of "QD." Being familiar with these medical abbreviations is essential for healthcare professionals to communicate effectively regarding patient care.