The purpose of this study is to learn about the safety and efficacy of pexacerfont in outpatients diagnosed with Generalized Anxiety Disorder

Inclusion Criteria:

• Outpatient women ages 18-65 meeting Diagnostic and Statistical Manual of Mental Disorders Manual, Fourth Edition, Text Revision (DSM-IV TR) criteria for Generalized Anxiety Disorder (GAD), either moderate or severe (300.02)

Exclusion Criteria:

• Males
• Patients who report a history of inadequate response to three or more adequate trials of any selective Serotonin reuptake inhibitors (SSRIs) for GAD within the last three years