I would love some advice about colonoscopy prep. having the procedure on Monday 24 June and from Sunday morning I will have to fast - for over 25 Hours and also use 2 doses of laxatives - Moviprep. I understand the suggested routines of low Fod diet in preceding day - ie Saturday, but how to survive the long fast without going into hypos. Furthermore I am on a cancer trial I at the Royal Marsden, and this has caused an adverse reaction for the past 6 months I have had ulcerative colitis - which I am suppressing with steroids. The steroids have forced me to increase the basal. as I have loose bowels already, I am not looking forward to using the Moviprep as it will evacuate my bowels very quickly, and then the second dose will probably just cause distressing levels of cramping in my guts. I do not want to have any hypos as this could jeopardise safety of the procedure on Monday morning and do not want to repeat all this again.!! thanks for advice