Inclusion Criteria:  Male or female ≥18 years of age. Capable of providing informed consent. Confirmed physician diagnosis of spasmodic dysphonia. Receives onabotulinumtoxinA for treatment of their spasmodic dysphonia. Experiences significant breathiness ± 5 days following their injection.  Exclusion Criteria:  History of epilepsy and on medication/treatment for the same. Women who are pregnant, expecting to get pregnant, or breastfeeding. Any condition that, in the view of the Principal Investigator, places the subject at risk, or subjects with poor treatment compliance.