To Compare the Pharmacokinetics of Tiotropium in Subjects With Chronic Obstructive Pulmonary Disease (COPD)

This multicenter study consists of a Screening Visit (3 to 14 days prior to randomization); 4 multiple-dose (7-day) Treatment Periods, each consisting of a 2-night/3-day inpatient stay (Day 6 to Day 8); and a Final Visit. A washout period of at least 21 days will occur between each Treatment Period. The Final/ Early Termination Visit will occur 6-8 days following the last Treatment Period or upon early discharge from the study.