Hello. Thank you for your question. I understand your concern. Contrast dye used nowadays for various medical examinations is principally made of iodine. These allergic reactions are expressed by several forms by the human body, ranging from a simple rash to a true anaphylactic shock. Not only people with allergic reactions to dye are at risk for allergic reaction, but also people with prior allergic reactions to various food and drugs. In our clinic, we have an experience with people with prior possible allergic reactions some time in their lives. The proper pre-medication is as follows: - 2 ampulles of Prednisolon 25 mg, intravenously administered 13, 7 and 1 hour before the procedure - Telfast 180 mg, administered orally 13 and 1 hour before the procedure. I am content to say that, when this pre-medication for allergic reaction was administered, we had not have a single episode of allergic reaction to contrast dye. I hope I was helpful with my answer. Take care and good luck with the procedure.