Efficacy and Safety of DYSPORT® Using 2mL Dilution in Adults With Cervical Dystonia.

Inclusion Criteria:

• Primary diagnosis of Cervical Dystonia at least 9 months since onset and eitherpreviously untreated with botulinum toxin or currently treated with Botox at a totaldosing range of 100-200 U and ≤60 U in the sternocleidomastoid muscle at the lastinjection cycle, and having had a satisfactory treatment response in the principalinvestigator's judgment during the last two sequential Botox treatment cycles.

• TWSTRS total score≥ 20; TWSTRS-severity subscale score> 10;

Exclusion Criteria:

• In apparent remission from Cervical Dystonia

• Diagnosis of pure retrocollis or pure anterocollis

• For non-naïve subjects, previous poor response to either of the last two Botoxtreatments

• Known requirement of <100U or >200U of Botox injected into the neck muscles