Bisacodyl
"Decided to take Dulcolax Pink, as it said it was gentle on sensitive stomachs (which I definitely have). I took 2, and then did the worst thing I could possibly do.... went online and read reviews. Needless to say I was completely freaked out by what I read and I prepared myself for an awful night. I have to say now, it was really not that bad. Exactly 6 hours after taking it, I had some cramping, very mild nausea, and diarrhea (but what do you really expect from a laxative?). I drank about 1.5 liters of water while taking this, so maybe that was part of it not being so bad. It's been about 16 hours now since I've taken it and I've eaten and feel completely normal. I don't like to rely on laxatives, but would take this one again if need be!"