A Randomised Placebo-Controlled Study Evaluating the Efficacy and Safety of DYSPORT Using 2mL Dilution in Adults With Cervical Dystonia (CD).

Inclusion Criteria:

- Primary diagnosis of Cervical Dystonia at least 9 months since onset and either
previously untreated with botulinum toxin or currently treated with Botox at a total
dosing range of 100-200 U and ≤60 U in the sternocleidomastoid muscle at the last
injection cycle, and having had a satisfactory treatment response in the principal
investigator'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 Botox
treatments

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