Using the Canary Breathing System for Panic Disorder Patients

Inclusion Criteria: * Primary diagnosis of Panic Disorder * Subjects between 18 and 60 years of age (inclusive on day of enrollment) * Subjects with a Clinician's Global Impression of \> or = to 4. * If on psychotropic medication, on a stable dose for a minimum of 3 months prior to enrollment * If on psychotropic medication, an agreement to stay on their stable dose from study entry until the 2-month follow-up. Exclusion Criteria: * Pregnancy * Current enrollment in another drug or device study * Current enrollment in another drug or device study that is not at least 30 days past the final follow-up * Currently undergoing cognitive behavioral therapy (or equivalent) * Refractory to either a breathing training program or cognitive behavioral therapy (or equivalent) in the 3 months prior to enrollment * Evidence of organic mental disorder * Severe suicidality * Presence of any psychotic disorder * Bipolar disorder that is present for \< 5 years; a major depressive, manic or hypomanic episode in the last 12 months; failure to take and maintain a stable dose of medication in treatment of bipolar disorder in the last 12 months * Current alcohol or drug dependence * Cardiovascular or pulmonary disease * Epilepsy or seizures * Undergoing additional psychologic treatment at any point from study enrollment to 2-month follow-up to treat panic disorder