Iohexol is a type of contrast agent used in medical imaging procedures such as X-rays, computed tomography (CT) scans, and angiography. It is injected into the body to help visualize internal structures or organs more clearly on imaging scans. Iohexol works by temporarily altering the way X-rays or other imaging techniques interact with body tissues, enhancing the contrast between different structures and aiding in the diagnosis of various medical conditions.