Evaluate Onset of Effect in Patients With Chronic Obstructive Pulmonary Disease (COPD) Treated With Formoterol Turbuhaler®

Inclusion Criteria: * A clinical diagnosis of COPD according to GOLD guidelines, and current COPD symptoms * A current or previous smoking history equivalent to 10 or more packs per year (1 pack year = 20 cigarettes smoked per day for one year). * Documented use of a short-acting inhaled bronchodilator (β2-agonist or anticholinergics) as reliever medication. Exclusion Criteria: * A history and/or current diagnosis of asthma. * Patients who have experienced COPD exacerbation requiring hospitalisation and/or a course of antibiotics and/or a course of systemic steroid within 30 days (from end of exacerbation treatment) prior to Visit 1 and/or during the run-in period. * A history and/or current diagnosis of atopic diseases such as allergic rhinitis or eczema before the age of 40.