Phillips' Milk of Magnesia
"I have been constipated for 20 YEARS due to a brain injury/nerve damage. Bottom line is I don't have a bowel movement without "help" EVER. I've usually go around 2-3 weeks without having one. Anyway this stuff is a lifesaver. I've tried everything. It's reliable and it doesn't hurt like other laxatives do. There can be slight cramping but that's to be expected when you haven't pooped in 20 days. Anyway I take it on an empty stomach, followed by a large glass of water (or three). The more water you drink the more violent it will be but I don't care as long as I feel better. I take it during the day, not before bed. This way there are no accidents and it works much faster (in the time it takes to start 'going' AND the time it lasts)"