The day before, I was on Jell-o and liquid (only), drank 5 oz of magnesium citrate at 9 a.m. and then again 5 oz at 3 p.m. In terms of aggravation, it was no worse than many a "bug" I've contracted over the years. I got a good night's sleep and was done by 9 a.m. the following morning. I don't remember much of that morning other than some mild discomfort from the distension (read: inflation :-) that's a part of the procedure. Once that ... escaped ... I was fine again. And hungry!