Basically, the cough suppressing ingredient in many of these medications is DXM. Taken in high dosages it is a dissociative, or hallucinogen. The drink and candy are added to make it taste great. On top of the health risks of taking hallucinogens, these medications also contain acetaminophen, which is the pain killer in Tylenol, which causes liver damage when taken in high doses.
Interesting.
I'm amazed, truly I am. People seem to go to all sorts of lengths to get a rush when all they have to do is go out and fire some automatic weapons for the greatest high EVER.