Suprep Bowel Prep Kit
"Suprep prescribed in preparation for colonoscopy.  As a laxative it's highly effective.  I threw up most of it, but what ever got left starts working within 15 minutes.  On recommendation I did chill it.  The taste is vile and gag reflex kicks in.  Then massive headache and chills.  Spoke to the doctor.  He recommended drinking second dose slowly.  That helped to keep it down, but headache/chills is worse and nausea kicked it.

I envy those who do not have these side-effects. "