Bisacodyl
"Never again. Ever. This is probably the 10th time I've taken dulcolax and each time is worse than the last. This time I took 2 tablets at 130 AM and got woken up at 730 AM. feeling extremely sick. Usually I would lay in bed and wait for it to pass, but not this time. I began to have violent vomiting while my stomach turned upside down! At this point I was vomiting while trying to not soil myself (which is a very unpleasant experience especially after first thing waking up). After BARELY having a bowel movement I crawled back into bed into the fetal position hoping it would be over soon. This is when the cramps began. The cramps from this medicine were the worst I've EVER experienced in my life. STAY AWAY FROM DULCOLAX! Stick with miralax!"