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Title An International Observational Prospective Study on Long-term Response to Botulinum Toxin Type A (BoNT-A) Injections in Subjects Suffering from Idiopathic Cervical Dystonia- Pharmaco- Economic Impact
Therapeutic Area Dystonia
Principal Investigator Bryan Ho, MD
Min Age 18 Years
Gender none
Contact Haley Huggins
More Information


This is a registry study to examine the long-term response to Botulinum toxin type A (BoNT-A) injections in subjects with idiopathic cervical dystonia. Focal dystonias are abnormal muscular contractions leading to twisting of body parts and abnormal postures. Cervical dystonia is the most common of the focal dystonias leading to the twisting of the head and neck. Botulinum toxin type A is a medication that has been shown to be effective in treating cervical dystonia. The effect of the treatment is not permanent and usually wears off after about 3 months, but sometimes the benefits may last longer. This is an observational study that involves subject’s medical data to be recorded, stored, and analyzed.

Study Details

Inclusion Criteria

  1. Suffering from idiopathic cervical dystonia
  2. Never been treated with BoNT injection or previously been treated with BoNT injection that had at least a 12-week interval between the last injection and inclusion

Exclusion Criteria

  1. Contraindications to any BoNT-A preparations

Study Requirements

Number of research visits: 5 visits including baseline visit, 3 follow-up visits, and end of study visit.

Length of participation: 36 months

Number of injections: 5 injections