bowel preparation
"I had my first colonoscopy yesterday and used the suprep.  Following other suggestions, I mixed with 7 up and cold water, and also refrigerated the two bottles before use.  To warn others who might be like me---it did NOT work within one or two, or even four hours for me.  I drank the first bottle and two cups of water around 6:30 pm (my procedure was at 9), and absolutely nothing happened until about 4:40 am, when it was time to drink bottle #2!  It worked great (and very swiftly at that point) and my procedure was successful, but just be warned it does not always work right after consuming the first dose, especially for those of us with (ahem) slower motility."