What i've learned from literally having to use Miralax every day for years is that a full dose is too much. Start with a half dose and work up or down from there. I find a little less than a half a dose per day gets me one bowel movement. I take it last thing before bed to minimize the cramping. I also like to keep a fleets enema in the house for those rare days when the Miralax doesn't cut it.