Efficacy and Safety of Tiotropium Compared to Salmeterol and Placebo in Patients With Chronic Obstructive Bronchitis (COPD)
Conditions
- Pulmonary Disease, Chronic Obstructive
Interventions
- DRUG: Tiotropium inhalation powder capsules
- DRUG: Salmeterol inhalation aerosol
- DRUG: Placebo inhalation aerosol
- DRUG: Placebo inhalation powder capsules
Sponsor
Boehringer Ingelheim