title: Alteration of brain dopamine and serotonin levels in cocaine users: a preliminary report.
abstract: OBJECTIVE
  This study tested the hypothesis that cocaine depletes dopamine levels in the brain.
  
  
  METHODS
  Levels of dopamine, serotonin, and their metabolites in the frontal cortex and striatum of nine cocaine users and nine matched control subjects who had never used cocaine were determined from postmortem autopsy material.
  
  
  RESULTS
  The cocaine users had significantly lower dopamine levels and higher serotonin levels in the frontal cortex than the control subjects. Levels in other brain areas did not differ between the two groups.
  
  
  CONCLUSIONS
  Alterations of dopamine and serotonin levels might contribute to symptoms of cocaine withdrawal and craving.
authors.affiliation: Department of Psychiatry, University of Michigan, Ann Arbor, USA.
authors.forename: K Y
authors.initials: KY
authors.lastname: Little
authors.forename: U N
authors.initials: UN
authors.lastname: Patel
authors.forename: T B
authors.initials: TB
authors.lastname: Clark
authors.forename: J D
authors.initials: JD
authors.lastname: Butts
mesh_terms: D000328:Adult; D002851:Chromatography, High Pressure Liquid; D003042:Cocaine; D003342:Corpus Striatum / Q000737:chemistry*; D004298:Dopamine / Q000032:analysis* / Q000378:metabolism; D005625:Frontal Lobe / Q000737:chemistry*; D006801:Humans; D012701:Serotonin / Q000032:analysis* / Q000378:metabolism; D013375:Substance Withdrawal Syndrome / Q000209:etiology; D019966:Substance-Related Disorders / Q000378:metabolism*
chemical_list: D012701:Serotonin; D003042:Cocaine; D004298:Dopamine