Which of the following medications is typically administered on a PRN basis?

The answer is based on the nature of how the listed medications are typically administered and the conditions they are intended to treat. Acetaminophen for fever is often given on a PRN (as needed) basis because it is used to manage temporary symptoms such as fever or pain. Patients may take it when they experience discomfort, but it is not required to be taken at scheduled intervals unless symptoms persist or the healthcare provider advises otherwise.

In contrast, antibiotics are usually prescribed for a specific course to treat infections and must be taken consistently for effectiveness. Blood pressure medication is generally taken regularly, as prescribed, to maintain stable blood pressure levels, and insulin, while it can sometimes be adjusted based on blood sugar readings, often follows a regular scheduled regimen alongside PRN adjustments as necessary for certain scenarios, such as correcting high blood sugar levels. Therefore, acetaminophen's primary role in symptom management aligns it with PRN administration.