dude tripple c's are the worst way to trip on dxm....well possibly not the worst but still they are dangerous!
If you want to trip on dxm get some Robotussin, as dxm is the only active ingredient in them....I think it's pretty easy to get aswell!
check this out for doses/effects etc
http://www.erowid.org/chemicals/dxm/dxm.shtml