Salmeterol xinafoate/Tiotropium Bromide Hydrate

The primary objective of this trial is to establish superiority of the once-daily Tiotropium plus Salmeterol Inhalation Powder in daytime lung function response and non-inferiority in night-time lung function response over the comparator treatments inhaled in their established dose regimens when administered for 6-week periods to patients with chronic obstructive pulmonary disease (COPD). The main secondary objective is to evaluate the safety of the Tiotropium plus Salmeterol Inhalation Powder versus the comparator treatments.

The primary objectives of this study are to assess bronchodilator efficacy as determined by FEV1, the effect on dyspnoea as determined by the BDI/TDI, the effect on health status as determined bt the SGRQ and the effect on COPD exacerbations