I've read some interesting things about this combination. The biggest problem would be the magnification of the terrible DXM body load by the LSD. Other than that (!) it should be quite ridiculous http://www.erowid.org/experiences/e...rch=&A1=-1&Lang=&Group=-1&Str=&Intensity=&I2=
Yeah but I'm usually able to handle the body load from DXM quite well, I've taken up to 1000 mgs. Although sumtimes I have a hard time breathing I think I should be fine though if I have my inhaler with me...