Dataset from Randomised, Double-Blind, Parallel Group Study to Assess the Efficacy and Safety of 4 Weeks of Once Daily Treatment of 3 Doses of Orally Inhaled BI 1744 CL, Each in Fixed Dose Combination With 5 Microgram Tiotropium Bromide (Delivered by the Respimat Inhaler) Compared With 5 Microgram Tiotropium Bromide Monoproduct (Delivered by the Respimat Inhaler) in Patients With COPD

The primary objective of this study is to determine the optimum dose(s) of BI 1744 CL administered with 5 micrograms tiotropium bromide solution for inhalation, delivered by the Respimat inhaler, once daily for four weeks in patients with chronic obstructive pulmonary disease (COPD).