The reaction you experienced is an adverse reaction to the product, not an allergy. True allergic reactions to iodinated contrast products are rare (2%) and can cause more serious effects such as swelling, red patches on the body, difficulty breathing, and heart problems. If you need to undergo the same exam again, it may be appropriate to mention it to the treatment team, but no other precautions are necessary. It is important to note that having a reaction to an iodine-based contrast material does not mean you are allergic to iodine, as iodine is an essential element for the human body.