constipation
"It is effective alright, but at what cost.  I have taken polyethelene glycol off and on for two years.  After several weeks not taking the drug, I did so for two days and had a severe reaction:  my lips are swollen and itchy, very uncomfortable.  What is distressing is that the pharmacist insisted there was no down side to this drug whatsoever and I could take it indefinitely.  Since then I have done more research and realize the danger of taking this drug, it is not benign and potentially destructive.  I think that "side effects" are greatly minimized by doctors who spend little time even learning about the side effects of various drugs.  Once prescribed we become guinea pigs."