This Saturday I have the immense pleasure ( ) of experiencing a colonoscopy. The procedure itself I basically know what to expect. Friday however, is my "cleansing" day and I'll be at work. I have to take 2 Dulcolax in the morning and I'm just wondering if anyone else has taken this stuff. (The REALLY fun stuff I don't have to take till I get home) I told my boss what was going on and warned him that I didn't know how useful I would be on Friday. Is this stuff pretty fast acting and how long does it "last"?