What is the meaning of the abbreviation "PR" in a medical context?

In a medical context, the abbreviation "PR" stands for "per rectum," which refers to the route of administration for medications or treatments inserted into the rectum. This method is commonly utilized when other routes may be inappropriate or ineffective, such as when a patient is vomiting, unconscious, or unable to take oral medication.

Using "per rectum" allows for the medication to be absorbed through the rectal mucosa, providing an alternative means of delivering medication while also catering to certain patient needs. This understanding is crucial for medical professionals when determining the most effective administration route based on a patient's condition or the specific medication being used.