SALTO - Symbicort Single Inhaler Therapy Use in Adolescent Adults and Adults With Persistent Asthma

Inclusion Criteria: * Minimum of 3 months documented history of asthma, diagnosed according to the American Thoracic Society (ATS) definition. * Prescribed inhaled GCS at a dose of ≥320 µg/day and within the approved label for the relevant drug during the last 3 months prior to Visit 1. Exclusion Criteria: * Use of any b-blocking agent, including eye-drops. * Use of oral GCS as maintenance treatment. * Known or suspected hypersensitivity to study therapy or excipients. * A history of smoking ≥ 10 pack years (1 pack year = 1 pack (20 cigarettes) per day for one year or equivalent).