Bisacodyl
"I didn't have a BM in three days so I took one pill around 6 pm. I went to bed that night feeling sick and cramping. I woke up at 1 am thinking I was about to have a BM. I didn't so I took two more pills. I went to bed and I woke up around 6:30am. By 7 o'clock came I had a BM and I literally sat on the toilet for three hours. I finally felt so much better. I didn't stop having diarrhea till midnight."