Hello, I m a 52 yr old male. Prepping for my first colonoscopy scheduled for 10:30 am today. As per doctors orders, I took the recommended 4 Ducolax laxative pills at 5pm yesterday, then started drinking the first part of Mialax. I weighed the content 3rd exactly, split the 238 grams in half. Had my first 8oz. cup of the mixture(in water, I m diabetic so no Gatorade) and data k the remaining 3 doses in exactly 15 minute intervals. It is now 3:40am and I m to resume drinking the other half of the mixture at 4:30am. The problem is, is that nothing at all has happened in regard to my bowels moving. The last I ate was around midnight yesterday, as per instructions and I even took some prescription Senna laxative pills, figuring that I d loosen up and start passing some stools, but it didn t really work. I managed to grunt out a few nuggets yesterday afternoon, and passed more of the same around 11:00. That s it. Any idea what s going on? Do you see me canceling the procedure today? Thanx for your input. And BTW, my pharmacist gave me a 238 gram bottle of Gavilax in lieu of the Miralax, and after researching them, apparently they re both the same-polyethylene-glycol.