The abbreviation QID indicates dosing frequency how many times per day?

• A. Four times a day
• B. Two times a day
• C. Once a day
• D. Three times a day

Answer: (A)

Dosing frequency abbreviations tell you how many times a day to take a medication. QID comes from quater in die, meaning four times in a day. So when a prescription lists QID, the dose is taken four separate times within a 24-hour period, typically spaced across waking hours (for example morning, midday, late afternoon, and evening). This differs from other common schedules such as twice daily or three times daily or once daily, which use different abbreviations.