Bisacodyl
"About 13 hours after taking the pill, BOOM. The worst cramps and intestinal pains that I've ever experienced. I sat on the toilet for 20 minutes in total agony trying not to wake anyone up. It felt like a rabid raccoon was trying to claw its way out from my bowels. It hurt so bad that I felt like I was going to throw up. At one point I thought "okay, this is my limit, if it gets any worse, I'm going to the ER"

After several waves of this, it finally ended and now, 24 hours later, I'm still having diarrhea and some cramping, but not as bad as last night.

LISTEN TO THE REVIEWS! This stuff is no joke! I took 2 tablets and I drank so much water. At least 7 or 8 glasses of water. It doesn't matter - you will get awful cramps.

Never again."