As my appointment is after 12pm (12.45pm), I need to start the 5 senna at 2pm, the picolax at 6pm, and moviprep at 7am (to drink over 1-2 hours). I am worried that it will take effect on the way to the hospital or while I am in there. Does the moviprep come out of you within an hour or so. I need to leave at 12pm to get to the hospital so will I be safe to say that I will be "empty". I am also overweight and wondered if the procedure would be more difficult being big? They haven't told me it would but just wondered. Many thanks