The purpose of the study is to document long-term response in real-life practice after injection cycles with BoNT-A in subjects suffering from idiopathic cervical dystonia (Long-term clinical and pharmaco-economic data).

Inclusion Criteria:

• Subject for whom there is an intention to treat with BoNT-A.
• BoNT treatment naïve or previously treated with BoNT.
• If previously treated with BoNT, at least a 12-week interval between the last injection (BoNT-A or BoNT-B) and inclusion.
• Subject able to comply with the protocol.
• Provision of written informed consent prior to collect the data.

Exclusion Criteria:

• Contraindications to any BoNT-A preparations.
• The subject has already been included in the study.

Adult subjects from Hospitals, Private Practices suffering idiopathic cervical dystonia.