<<Disclaimer: Verify this information before applying it to your situation.>> Hi All, I underwent a CT scan on Friday, July 26, and was told that 1 in appx 500 react badly to the contrast solution they inject. Because of my alergies, and celiac disease, the Doctor chose to go with a more expensive contrast solution that causes a reaction in fewer people. I reacted, at the time, with difficulty breathing, and a light-headed dizziness. I was given some counteracting drugs, and kept there until the reaction had subsided, and was then released. When the doctor (radiologist I think) released me, he said that he was thinking about "writing this up," as I am the third celiac he has given this contrast solution to, and all three of us have reacted to it. He thinks it might be the iodine. Since that time, 5 days ago, i have felt quite ill, with vomiting, very watery diarrhea, muddle-minded, and lots of pimple-like sores that are very annoying. Something the doctor said indicated that a CT scan could be done without the contrast solution, so that might be an option worth exploring, should the need arise for you to undergo a CT scan. I hope that is helpful. Ron Hoggan Calgary, Alberta, Canada