Establishing and Eliminating Cue-drug Associations in Human Cocaine Addiction

Inclusion Criteria: 1. Age 18 - 50 years 2. voluntary, written, informed consent 3. physically healthy by medical history, physical, neurological, ECG, and laboratory examinations 4. DSM-IV criteria for Cocaine Abuse (305.60) or Cocaine Dependence (304.20) 5. recent street cocaine use in excess of that administered in the current study 6. intravenous and/or smoked (crack/freebase) use 7. positive urine toxicology screen for cocaine 8. for females, non-lactating, no longer of child-bearing potential (or agree to practice effective contraception during the study), and a negative serum pregnancy (-HCG) test 9. able to read English and complete study evaluations. Exclusion Criteria: 1. Other drug dependence (except nicotine) 2. a primary major DSM-IV psychiatric diagnosis (schizophrenia, bipolar disorder, etc.), unrelated to cocaine 3. a history of significant medical (cardiovascular) or neurological illness (e.g., prior myocardial infarction, current active symptoms of cardiovascular disease / angina, evidence of cocaine-related cardiovascular symptoms, prior arrythmias of clinical significance, and/or need for cardiovascular resuscitation, neurovascular events such as transient ischemic attacks, stroke, and/or seizures) 4. current use of psychotropic and/or potentially psychoactive prescription medication 5. seeking treatment for drug abuse/dependence 6. those having contraindications to beta-blocker administration, including diagnoses of asthma, bronchitis, emphysema, or a history of adverse reactions to beta-blockers (including propranolol), as well as those with bradycardia and/or first-degree or greater heart block by ECG