Bisacodyl
"I took one dulcolax last night at about eleven p.m. I have taken it before with out the problems I am having now. By four a.m. I was having severe stomach cramping but, no bowel movement. I experienced horrible cramps, nausea, bloating that would not relieve for hours and now it is almost six p.m. the following day and while the cramping is much less I still have an upset stomach. I considered going to the emergency room last night but, I really could hardly move and knew there was little they could do for me there. I will not ever take this stuff again! The packaging says it is "gentle" Good lord, no it isn't!! I've taken mag citrate before and did not experience the type of cramping and pain I had for hours early this a.m. with dulcolax. Will never take this again, I am still not feeling well almost twenty four hours after I took the one pill."