dxm is a mind-altering which is also used to help cough. it is in most robitussin formulas. but if you decide to trip off of dxm, make sure that that is the ONLY active ingredient, as too much of the active ingredient guaifesiein can make you throw up and any other active ingredient could have bad effects on you, for more info check out
http://www.erowid.org/chemicals/dxm/dxm_info2.shtml

oh, and dont get scared by the reports, dxm is safe, as long as thats all thats in the product