Bisacodyl
"Avoid like the plague, took two yesterday midday and woke up with the most unbelievable stomach ache I have ever had. Screaming in pain, hubby wanted to take me to hospital. Never felt anything like it, it was so bad I can't even put it into words, then came the nausea and then the vomiting. 2 hours later I am a crying mess and then finally got off to sleep. To add further insult there was no 'movement' and I have felt bloated and like I have been gut punched all day. Save yourself the agony and get some prune juice."