I'm supposed to have a colonoscopy at 6 a.m. tomorrow morning. I've had nothing to eat since about 5 p.m. yesterday and have been drinking water all day. I started Trilyte at 3 p.m., drinking an 8-oz glass every 10 minutes until half container was gone. Nothing has happened and it is now almost 5:30. I'm supposed to drink the other half starting at 7 p.m. I've had several colonoscopies in the past and this has never happened.