The past ten years have brought radical advances in the pharmacology of serotonin and benzodiazepine. Brings together comparative data on three important classes of anxiety-reducing drugs: benzodiazepine, 5-HT1A agonists, and 5-HT3 receptor antagonists. Highlighting behavioral similarities and differences, the editors provide an authoritative account of the major developments in our understanding of the behavioral pharmacology of benzodiazepine and serotonin receptor ligands.