Bisacodyl
"Took 2 dulcolax at 7.30 on Friday night and was fine woke up yesterday morning and had what felt like severe gas had a bm around 10.30am feeling fine continued with my day then around 4pm I was lying on my bed with severe cramps and had to run to make it to the bathroom I have the worse bout of the runs ever it was so bad it would not stop and the pain in my anus was horrendous. This is now Sunday and I'm still feeling awful will never take this medication again"