I had two thirty years ago. I had an alergic reaction to the "new " dye with the first...the results was, I couldn't stand the smell of food...lost 16 pounds in two weeks..(wonder if I could get some of that dye now ) The second went ok, just after the injection, they put me face down on a small "table" and tilted it up for the screening of the dye. The table had a small ledge and it was very painful to my back to stand on the ledge with just the front part of my feet. Having said that, my back pain was sooo severe beforehand , I would not hesitate to do the procedure again if I had disc problems again.