This study evaluated the safety and efficacy of four doses of TD-4208 and a placebo product when administered once daily for 28 days using a jet nebulizer to patients with moderate to severe chronic obstructive pulmonary disease.

Inclusion Criteria:

• Subject is a male or female subject 40 years of age or older
• Subject must have a negative pregnancy test, and must be prepared to use effective contraception if of child-bearing potential
• Subject is capable of performing reproducible spirometry maneuvers
• Subject has post-bronchodilator FEV1/FVC ratio <0.7
• Subject has moderate-to-severe stable COPD (Stage 2 or 3 according to the GOLD Guidelines)
• Subject has a post-bronchodilator FEV1 greater than or equal to 30% and less than 80% of predicted normal
• Subject has a current or past smoking history of at least 10 pack-years.

Exclusion Criteria:

• Subject has a significant respiratory disease or disorder other than COPD that would affect the interpretation of data from this study
• Subject has a history of reactions or hypersensitivity to inhaled or nebulized anticholinergic or beta-agonist agents
• Subject suffers from any medical condition that would preclude the use of inhaled anticholinergic agents
• Subject has been hospitalized for COPD or pneumonia within 12 weeks
• Subject requires long-term oxygen therapy (>15 hours a day)

One subject who received placebo was excluded from the efficacy analysis. The reason for this is that the subject was found to be participating in a GSK study with another investigational agent at the same time as their participation in this study.