Bisacodyl
"WORST MEDICATION EVER!!!! 

The only reason I'm giving this medication a 2 is because it does clear u out. I've suffered with constipation for several years, sometimes I will go 7-11 days without a BM. This time it's been 8 days and I'm miserable so I decided to take dulcolax, I have taken it in the past but the symptoms were not as bad as they have been this time. I took 1 pill around 1:00pm, around 4:00 with no signs of anything I decided to take 1 more, still nothing so decided to eat some Mexican food around 7:30. HUGE MISTAKE. Stomach cramps started around 9:30, got worse as the time went on. 

Here it is 12:00am, I've been sitting on toilet since 9:45 in extreme pain and hot flashes, had my first BM around 11:45 and feeling very sick!"