Safety and Efficacy Study of NBI-98854 in Adults With Tourette Syndrome

Inclusion Criteria: 1. Have a clinical diagnosis of Tourette Syndrome (TS) 2. Have at least moderate tic severity 3. Have TS symptoms that impair school, occupational, and/or social function 4. If using maintenance medication(s) for TS or TS spectrum diagnoses (e.g. obsessive-compulsive disorder \[OCD\], Attention-Deficit Hyperactivity Disorder \[ADHD\]), be on stable doses 5. Be in good general health 6. Have a negative urine drug screen for amphetamines, barbiturates, benzodiazepine, phencyclidine, cocaine, or opiates, and a negative alcohol screen 7. Subjects of childbearing potential who do not practice total abstinence must agree to use hormonal or two forms of nonhormonal contraception (dual contraception) consistently during the screening, treatment and follow-up periods of the study Exclusion Criteria: 1. Have an active, clinically significant unstable medical condition within 1 month prior to screening 2. Have a known history of long QT syndrome or cardiac tachy-arrhythmia 3. Have a known history of neuroleptic malignant syndrome 4. Have a cancer diagnosis within 3 years prior to screening (some exceptions allowed) 5. Have an allergy, hypersensitivity, or intolerance to VMAT2 inhibitors 6. Have a known history of substance dependence, substance (drug) or alcohol abuse 7. Have a significant risk of suicidal or violent behavior 8. Are currently pregnant or breastfeeding 9. Have initiated Comprehensive Behavioral Intervention for Tics (CBIT) during the screening period or at baseline or plan to initiate CBIT during the study 10. Have received an investigational drug within 30 days before screening or plan to use an investigational drug (other than NBI-98854) during the study 11. Have a blood loss ≥550 mL or donated blood within 30 days prior to screening