Magnesium citrate
"I hadn't had a bowel movement in 10 days. I was plugged up with a large, dry and hard stool that wouldn't budge no matter how hard I pushed. 8 days in, I tried a glycerine suppository to try to soften it up so I could go. That didn't work, so for the rest of the day I took 3 doses of miralax and another dose the next day plus another suppository. Didn't do a thing. I found an unopened bottle of magnesium citrate in the cabinet. I had never tried it before for constipation, but I was out of options. I drank half a bottle at 10pm. At 7:30am the next morning everything was literally flowing out of me. This cleaned me out without causing any cramping or discomfort. Magnesium citrate is the only thing I'll ever use for constipation from now on"