This resource includes information about depression, diagnosis of depression - DSM-IV, pathophysiology of depression, classes of antidepressants, tricyclics and heterocyclics - clinical pharmacology, tricylics and heterocyclics - pharmacokinetics and toxicity, some commonly used tricylics and heterocyclics, selective serotonin reuptake inhibitors (SSRI?s), some commonly used SSRI?s, bupropion, MAO inhibitors, treatment of depression, sedatives and hypnotics, GABA (?-aminobutyric acid), barbiturates, clinical use of sedatives, tolerance, cross-tolerance, and addiction.