A Multicenter, Randomized, Double-blind, Placebo-controlled 3-period Complete Cross-over Study to Assess the Bronchodilator Effects and Safety of Glycopyrronium Bromide (NVA237) (25 ug and 50 ug o.d.) in Asthma Patients.

This study uses a randomized, double-blind, placebo controlled, 3-period cross-over clinical trial design. During a screening epoch patient eligibility will be assessed. The screening epoch will be followed by a 21-day Run-in epoch during which patients will continue their inhaled corticosteroids use but be withdrawn from LABA-treatment and switched to short-acting bronchodilator-rescue medication. After the Run-in period patients will be randomized to one of the 6 treatment sequences and enter the first 7-day study treatment period. Treatment period one is followed by a 10 to 14 days washout period after which patients begin the second 7-day treatment period which is then followed by a second 10 to 14 days washout period followed by the third 7-day treatment period. At the end of each treatment period spirometry will be performed to assess the primary endpoint in terms of trough FEV1. The study population will consist of approximately 144 patients with asthma who have been treated in a stable regimen of ICS/LABA for at least 4 weeks prior to screening.