dxm is stupid same with all other pills youcan get off the shelf. The stupidest is most likely Drammamine... its so dumb, it seriously causes brain damage or just fucking is not good for your brain or your liver (same with dextromorph blah blah bal DXM sucks.
ive done dxm and sdrammamine so many times.
if your going to do it though do it right
get the VIcks 44 Cough Relief, it only has one active ingredient Dextromethorphan HBr 30 mg (cough suppressant) thats what fucks you up. i woudl drink about half of it and then finish the other half later..

it says on the back


* Use does cup, teaspoon (tsp), or tablespoon (TBSP)
* Do not exceed 4 doses per day
or maybe take 4 or five doses to get an effect... after ia while i think you develop a tolerance or somthing i used to be able to dirnk the whole bottle.

if you must do it then do it... its not even a trip thoutgh more of a sleepy groggy buzz ... there arent extreme visuals...just do mushrooms or acid or x, the buzzes are better