Magnesium citrate
constipation
"I've taken this before surgery and when backed up before.  Right now I'm having increasing lower abdominal pain for a couple days now.  I finally drank 1/2  a bottle about 9pm.  It's 10:42pm and I'm getting some gurgling but nothing more.  I hope this works because I'm in big pain.  I have work at 4am so I'm concerned about my morning experience.  Fingers crossed."