Dextromethorphan
cough
"I wish I had read the reviews before taking this product!  Forty five minutes after taking Delsym I had lots of belly gurgling then painful cramps and then immediate violent diarrhea! I got so dizzy & lightheaded while sitting on the toilet I almost passed out. I will never take this product again & will advise all friends & family to avoid it as well.  As far as suppressing my cough, I was too afraid to cough for some time after the diarrhea started!!"