It has been several years since I had my last colonoscopy, that one went OK, but I used Phospho-soda at that time and I didn't have any troubles with the prep at all. This time tho I am using 4 bisacodyl tablets and drinking the magnesium citrate. Hoping it goes well. I know from past experience that I'm not always able to get all of the prep down, it usually makes me too ill (nauseated). I was diagnosed with IBS-D many years ago, but over the past year and a half my symptoms have become much more severe, and because of a few members of my immediate family having colitis, we need to get this colonoscopy done to see what I am dealing with, my doctor thinks I may have colitis. I applied for social security disability in June of 2009, so another reason I need to get the colonoscopy done. Anyone ever had the magnesium citrate before? Is it a lot like the Phospho-soda prep?