Which of the following is an example of a symptom that may require a PRN medication?

A fever is an example of a symptom that may require a PRN (pro re nata, or "as needed") medication because it indicates a temporary condition that can fluctuate in intensity. Patients often take medications such as antipyretics (e.g., acetaminophen or ibuprofen) on an as-needed basis to manage fever symptoms and improve comfort. This type of medication is not taken on a regular schedule but rather in response to the presence of the fever.

In contrast, an infection typically requires a consistent course of antibiotics or antiviral medications rather than PRN treatment, as the treatment must address the underlying cause and eliminate the pathogens. A drug interaction is a potential issue that is managed by adjusting prescribed medications rather than using PRN medication. A chronic condition is usually managed with long-term medications rather than as-needed doses, as these conditions typically require consistent treatment to maintain stability.