Cocaine
How it works:
Blocks dopamine uptake in brain's neurotransmitters, stimulating "pleasure nerves".
How it feels:
Rush of euphoria, energy, confidence, talkativeness, followed by a "low".
Suppressed pain and appetite.
How it hurts:
Increase heartbeat, respiration, depression, paranoia.
Can induce heart attack, stroke, psychosis, coma.
How to get help:
Psychiatric Institutes of America, 1-800-COCAINE