A Study to Assess the Efficacy and Safety of Pagoclone for Adults With Stuttering

Inclusion Criteria: * Male and females age 18 to 80 years presenting with a history of stuttering with onset prior to age 8 years old. * Stuttering severity must be notable for \> 3 syllables stuttered on a reading and cenversational task at scereening and with at least 2% contributed individually from conversational and reading tasks. Exclusion Criteria: * Patients with unstable hematological, autoimmune, endocrine, neurological, renal, hepatic, retinal, gastrointestinal, or cardiovascular disease.