Bisacodyl
"I have to admit it was kind of hilarious and daunting at the same time when I read the reviews on this site- I had just taken 2 pills, and after reading about all the suffering that everyone (or most people) had endured, I was afraid the same was going to happen to me. But in fact, I had the complete opposite experience- absolutely no change whatsoever! The pills didn't work- took them at 7pm the day before, farted a lot since then, but woke up next morning with no effect and still constipated. God only knows what the issue is... Anyway, I'm giving it a 1 rating because it was ineffective as opposed to too effective, although I may be one in a million"