Earlier today there was a post about poop, or the lack of poop. I just downed a huge glass of prune juice....so how long before I know if that works or not? How much prune juice do you need to drink for it to make you poop? Next step is the milk of magnesia. My dr. said that was ok to try. Colace isn't working, drinking lots of water, eating lots of fiber, eating greasy food...nothing is working. No poop here since Wednesday. I'm growing desperate!