From my initial studies, CCC mainly contains Dextrometorphan as its active ingredient, a well known cough supressant and occasional drug of abuse. It is quite low toxicity compared to many other abused medicines, but the main side effects are hallucinations and euphoria. The effects can also be dangerously potentiated by simultaneous ingestion of alcohol and/or other psychotropic drugs. Like most opioid-based compounds, it can cause variable amounts of nausea, vomiting, and respiratory depression (i.e. you could stop breathing). This is more of a problem with morphine, but can't be ruled out for this compound. Hypotension (low blood pressure) and rapid-heart beat (tachycardia), are unlikely, but potentially serious complications.
If you fancy reading an article on this subject, there is a fairly decent journal report on Dextrometorphan at
http://www.dextroverse.org/Archives/...buse_Study.pdf - it goes into some depth, so be prepared to skim a little to get to the info you are interested in...