computed tomography
"I drank Readi-Cat (barium sulfate) for an abdominal CT scan. I gave it a nine only because of the taste. It was thick, and had the consistency of vegetable oil with a citrus flavor. I experienced some very mild heartburn and nausea while drinking it, but that went away very quickly. The following morning, I had one bout of diarrhea, which was listed as a side effect. Other than that, I didn't experience any of the listed possible side effects. Overall a much better experience than I was anticipating!"