A Pilot Study Of SD-809 (Deutetrabenazine) In Moderate To Severe Tourette Syndrome (TS)

Inclusion Criteria: * 12 to 18 years of age, inclusive, at Screening. * Patient has a Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-V) diagnosis of Tourette Syndrome and has manifested motor and phonic tics within 3 months before the Screening visit * Patient has total tic score of ≥19 on the YGTSS * Tic severity and frequency has been stable for at least 2 weeks before the Screening visit * Willing to adhere to medication regimen and to comply with all procedures * Patient is in good general health, as indicated by medical and psychiatric history and physical examination * Patient and parent/guardian have provided written, informed consent (and written assent, as appropriate) * Female patients of childbearing potential agree to use an acceptable method of contraception * Additional criteria apply, please contact the investigator for more information Exclusion Criteria: * Patient has a serious untreated or undertreated psychiatric illness * Patient has a history of suicidal ideation or behavior * Patient has received tetrabenazine, neuroleptics, benzodiazepines, topiramate, dopamine receptor antagonists within 14 days of Screening or Baseline; or botulinum toxin within 3 months of Screening or Baseline * Patient is being treated with deep brain stimulation for control of tics * Patient has a progressive or degenerative neurological disorder or a structural disorder of the brain * Patient has participated in an investigational drug or device trial within 30 days of Screening * Patient is pregnant or breastfeeding at Screening or Baseline * Patient has a history of alcohol or substance abuse in the previous 12 months, as defined in the DSM-V * Additional criteria apply, please contact the investigator for more information