Buspirone
Buspirone is an anxiolytic agent chemically and pharmacologically unrelated to benzodiazepines, barbiturates, or other sedative/hypnotic drugs.  Although its exact mechanism of action is unknown, buspirone may exert its anti-anxiety effects via serotonin (5-HT1A) and dopamine receptors (D2) and may indirectly affect other neurotransmitter systems. Unlike typical benzodiazepine anxiolytics, this agent does not exert anticonvulsant or muscle relaxant effects and lacks prominent sedative effects.