I had one about 6 months ago, though I think it was an MRI, anyway, no problems. Way different than the stuff you drink to clean you out before a colonoscopy. That stuff is awful and the results are predictable. The barium (berry- flavored) was tolerable with no effects or after effects. I drank it before I went at whatever time they told me to, then when I got there, they had me drink several more ounces before going into the machine. The whole thing was a nonevent for me.