Bisacodyl
"Reading the reviews on people's experience with pain I feel they are missing the point that the pain is all the crap moving its way down. I experienced the same sort of pain this morning but it's the same pain I get when I haven't been for days and it all finally starts moving. It doubles me over and takes my breath away. So I think the pain is a sign that there's a lot of crap inside that needs to move."