Cervical dystonia – Diagnosis and treatment – Mayo Clinic

Most people with cervical dystonia see an improvement with these injections, which usually must be repeated every three to four months. To improve results or to help reduce the dosage and frequency of botulinum toxin injections, your doctor might also suggest oral medications that have a muscle-relaxing effect.

https://www.mayoclinic.org/diseases-conditions/cervical-dystonia/diagnosis-treatment/drc-20354128