What is the abbreviation for "as needed" in medical prescriptions?

The abbreviation for "as needed" in medical prescriptions is PRN. This term originates from the Latin phrase "pro re nata," which translates to "as the situation arises" or "as needed." In clinical practice, it is commonly used to indicate that a medication or treatment should be administered only when necessary rather than on a fixed schedule. This allows for more flexible patient care, as it accounts for the patient's current state and needs, ensuring that medications are given only when they can provide the most benefit.

The other terms are used for different medical contexts: NPO stands for "nothing by mouth," indicating that a patient should not consume any food or fluids; STAT indicates something that should be done immediately; and TC might refer to "treatment carried out" or something similar, depending on the context but is not related to "as needed." Understanding these distinctions is essential for proper medication administration and patient management in a healthcare setting.