I've had 6 since 2006 (3 this past December alone). I've never had to drink the barium, but had the IV injected dye each time. It's not good for your body to have them done that often, but if it's necessary, get it done. My GI was not pleased to hear that they gave me 3 of them while I was in the hospital (it was an emergency surgery). But I guess it's ok, I'm not dead yet...lol And I only glow in the dark a little...lol