i have expierenced Dextromethorphan multiple times, many people end up taking too high of a dose, and the overdose is very unlikeable, being the reason it has a bad repuatation, because kids will overdose on drinking too much cough syrup with acet.(tylenol, forget the whole spelling, "acetemenaphen?"). for those that do not know DXM is a cough supressant in most of your cough and cold medications on the market, in high doses giving more euphoric effects.
So yeah the bad rep comes from people taking too much of it, and most commonly with additives, like antihistamines and shit like that, will fuck you up really bad. pure DXM powder is also available somewhere online... if your reading this and want to try DXM please find a product that contains only DXM and don't kill yourself, THANKS
My expierences have all been very good, aside from throwing up robotussin.