['tardive dyskinesia']
['sd-809', 'placebo']

        Inclusion Criteria:

          -  History of using a dopamine receptor antagonist for at least 3 months

          -  Clinical diagnosis of tardive dyskinesia and has had symptoms for at least 3 months
             prior to screening

          -  Subjects with underlying psychiatric diagnosis are stable and have no change in
             psychoactive medications

          -  Have a mental health provider and does not anticipate any changes to treatment regimen
             in the next 3 months

          -  History of being compliant with prescribed medications

          -  Able to swallow study drug whole

          -  Be in good general health and is expected to attend all study visits and complete
             study assessments

          -  Female subjects must not be pregnant and must agree to an acceptable method of
             contraception throughout the study

        Exclusion Criteria:

          -  Currently receiving medication for the treatment of tardive dyskinesia

          -  Have a neurological condition other than tardive dyskinesia that may interfere with
             assessing the severity of dyskinesias

          -  Have a serious untreated or undertreated psychiatric illness

          -  Have recent history or presence of violent behavior

          -  Have unstable or serious medical illness

          -  Have evidence of hepatic impairment

          -  Have evidence of renal impairment

          -  Have known allergy to any component of SD-809 or tetrabenazine

          -  Has participated in an investigational drug or device trial and received study drug or
             device within 30 days

          -  Have acknowledged use of illicit drugs

          -  Have a history of alcohol or substance abuse in the previous 12 months
      