Allergic reactions to oral iodinated contrast agents: reactions to oral contrast.

Allergic reactions can occur with virtually all substances used in medicine. Recently there has been increasing recognition that iodinated oral contrast agents (oral contrast) used in radiology are also capable of inducing an allergic response. Fortunately these are rarely life-threatening. This paper discusses three cases of mild reactions to oral iodinated contrast (all for computed tomography (CT) scans). The Australian experience of these agents is also reviewed.