What does the abbreviation q.i.d. indicate in medication instructions?

The abbreviation q.i.d. stands for "quater in die," which is a Latin phrase meaning "four times a day." This indicates that the medication should be taken or administered four times within a 24-hour period, typically at even intervals throughout the day. Understanding this abbreviation is crucial for ensuring that patients take their medications as prescribed, which can significantly impact the effectiveness of the treatment. Proper adherence to dosing schedules helps achieve optimal therapeutic outcomes.