Efficacy and safety of two incobotulinumtoxinA injection intervals in cervical dystonia patients with inadequate benefit from standard injection intervals of botulinum toxin: Phase 4, open-label, randomized, noninferiority study

•Botulinum toxin treatment benefit for CD can wane before typical reinjection cycle.•Shorter injection cycles of incobotulinumtoxinA are effective for treating CD.•Shorter injection intervals have no unexpected AEs or loss of treatment effect.