Suprep Bowel Prep Kit
"Do not take this product if you think you have an irritation or ulcer in your colon. It works for about 4 hours (had about 5 to 7 visits to the toilet). In the 5th hour (11PM), I start getting intense pain in my lower right abdomen where the colon is located. The pain was so severe that I was not able to lay down. I could sit to ease the pain somewhat but still could not fall asleep. I stood periodically to ease the pain, but basically had a sleepless night. I decided not to take the second dose at 5AM for fear the pain would be even worse.  I was not able to have the colonoscopy as a result."