This study is to confirm the safety of Symbicort® Turbuhaler® 160/4.5 µg 1, 2 or 4 inhalation b.i.d. over a 52 week treatment period in asthmatic patients who are being treated with IGCS and long acting β2-agonist (LABA) and/or other anti-asthmatic drugs.

Inclusion Criteria:

• Diagnosis of asthma with a documented history of at least 6 months duration prior to Visit 1
• Prescribed daily use of an IGCS for ≥12 weeks prior to Visit 1
• Prescribed daily use of at least one of the following:

Theophylline, long acting β2-agonist (LABA), other anti-asthmatic drugs (leucotrine antagonists, inhaled anti-cholinergics, Th2 cytokine inhibitor) for at least 4 weeks prior to Visit 1 at a constant dose

Exclusion Criteria:

• Any significant disease or disorder that may jeopardize the safety of the patient
• Respiratory infection, judged by the investigator(s) as an infection affecting the asthma, within 4 weeks prior to Visit 1
• Treatment with oral, parenteral or rectal GCS within 4 weeks prior to Visit 1