Long-Term Safety and Efficacy of Repeat Treatments of DaxibotulinumtoxinA for Injection in Adults With Isolated Cervical Dystonia (ASPEN-OLS)

Approximately 350 adult subjects will be recruited from approximately 80 study centers in the United States, Canada, and Europe who were enrolled in the ASPEN-1 Study Protocol 1720302 and de novo subjects (not previously enrolled in ASPEN-1 Study Protocol 1720302) will be treated with up to 4 different doses of daxibotulinumtoxinA for injection.