I took MoviPrep made by Salix to clean my bowels for a colonoscopy. As instructed I started at 6 p.m. and was instructed to take the 2nd phase of the treatment at 5:30 the this morning. I did that. I never had a bowel movement until about 8:00 this morning. My appointment for the procedure was for 9:00 this morning. The nurse said that we needed to reschedule the procedure. Why didn't work?