Safety And Efficacy Of GSK233705 Plus Salmeterol Compared With 2 Active Comparators And Placebo In Subjects With Chronic Obstructive Pulmonary Disease (COPD)

A multi-centre, randomised, partially blinded, placebo-controlled, three-way crossover, incomplete block design study to investigate the, safety, tolerability, pharmacodynamics/efficacy and pharmacokinetics of dual bronchodilator therapy with salmeterol 50 mcg twice daily plus two different doses of GSK233705 (20 and 50 mcg twice daily), compared with placebo, salmeterol 50 mcg twice daily alone, and tiotropium 18 mcg once daily alone, in subjects with chronic obstructive pulmonary disease