for people ages 18-75 (full criteria)
at La Jolla, California and other locations
study started
estimated completion



This is a Phase 3, open-label study to evaluate the long-term safety and tolerability of valbenazine, and to provide subjects continued access to valbenazine for the treatment of chorea associated with Huntington disease.

Official Title

Open-Label Rollover Study for Continuing Valbenazine Administration for the Treatment of Chorea Associated With Huntington Disease


Chorea, Huntington Huntington Disease Chorea Valbenazine


You can join if…

Open to people ages 18-75

Either #1 or #2 must be met for inclusion eligibility.

  1. Have participated in Study NBI-98854-HD3005 and
  2. Study drug dosing completion of Study NBI-98854-HD3005, as demonstrated by completed study drug dosing through the follow-up visit OR early terminated Study NBI-98854-HD3005 for administrative reasons due to COVID-19 (eg, site closure related to COVID-19)
  3. Did not participate in Study NBI-98854-HD3005 and
  4. Have a clinical and genetic diagnosis of Huntington Disease (HD) with chorea
  5. Be able to walk, with or without the assistance of a person or device
  6. Be able to read and understand English and capable of providing consent to study participation or have a legally authorized representative providing consent and the subject providing assent
  7. Subjects of childbearing potential must agree to use contraception consistently while participating in the study until 30 days after last dose of the study treatment

You CAN'T join if...

  1. Have difficulty swallowing
  2. Are currently pregnant or breastfeeding
  3. Have a known history of long QT syndrome, cardiac tachyarrhythmia, left bundle-branch block, atrioventricular (AV) block, uncontrolled bradyarrhythmia, or heart failure
  4. Have an unstable or serious medical or psychiatric illness
  5. Have a significant risk of suicidal behavior
  6. Have a history of substance dependence or substance (drug) or alcohol abuse, within 1 year of screening
  7. Have received gene therapy at any time
  8. Have received an investigational drug in a clinical study (other than valbenazine) within 30 days before the baseline visit or plan to use such investigational drug (other than valbenazine) during the study
  9. Have had a blood loss ≥550 mL or donated blood within 30 days before the baseline visit
  10. . Have a history of severe hepatic impairment or history of protocol specified hematologic abnormalities during the course of the NBI-98854-HD3005 study
  11. . Had a medically significant illness within 30 days before baseline, or any history of neuroleptic malignant syndrome
  12. . For subjects who did not participate in NBI-98854-HD3005: have a history of VMAT2 inhibitor use within 30 days of baseline


  • Neurocrine Clinical Site accepting new patients
    La Jolla California 92037 United States
  • Neurocrine Clinical Site accepting new patients
    Vancouver British Columbia V6T 2B5 Canada


accepting new patients
Start Date
Completion Date
Neurocrine Biosciences
Study website Sign up for this study
Phase 3
Study Type
Last Updated