What does the abbreviation "PRN" stand for?

The abbreviation "PRN" stands for "as needed," which signifies that a medication or treatment should be administered only when necessary rather than on a fixed schedule. This approach is commonly used in medical settings where a patient's condition may vary, allowing healthcare providers to provide care based on individual circumstances. Understanding this term is crucial as it ensures patients receive appropriate treatment without unnecessary dosing, ultimately promoting safety and effective medication management. The other options refer to specific dosing schedules, which do not capture the flexibility inherent in "PRN" usage.