Bisacodyl
"I've taken Correctol several times in my life and it worked without any horrible side effects. I had back surgery and was on oxycodone for two years. Now, off of oxycodone for over a year, I have taken Correctol. I get VERY "jittery", feel like I have to vomit, and pretty heavy cramps. Using Correctol all while taking oxycodone I had no side effects. Evidently, the oxycodone exchange something in my body chemistry which causes me now to have bad side effects. But, the good outweighs the bad. I'll still use Correctol when I have to, but now with side effects."