Magnesium citrate
"After fruits and veggies, strong coffee, flax, big meals (those usually facilitate things quickly), glycerin suppositories, bisacodyl sodium suppositories, I was convinced that magnesium citrate would not have a major effect on me. I downed the whole bottle and patiently waited for about 5-6 hours. And then the fireworks began. Some people are lucky to be relieved from the first round. I've been running back and forth to the bathroom for about 12 hours now.  This 98 cent bottle from Walmart has cleaned me out better than anything else I've tried. Read these following words slowly: you. Are. Not. Immune. To magnesium citrate. It doesn't matter who you are or how constipated you are. It WILL work."