PT001 MDI Versus Atrovent Study in Moderate to Severe Chronic Obstructive Pulmonary Disease (COPD)

The primary objective of this study is to demonstrate efficacy relative to placebo of PT001 MDI in patients with moderate to severe chronic obstructive pulmonary disease (COPD) within the range of doses evaluated in this protocol. To this end, each dose of PT001 MDI will be compared to placebo with respect to the primary efficacy endpoint, FEV1 AUC0-12 relative to baseline.

Key Inclusion Criteria:

• Signed written informed consent
• 40 - 80 years of age
• Clinical history of COPD with airflow limitation that is not fully reversible
• Females of non-child bearing potential or females of child bearing potential with negative pregnancy test; and acceptable contraceptive methods
• Current/former smokers with at least a 10 pack-year history of cigarette smoking
• A measured post- bronchodilator FEV1/FVC ratio of < or = 0.70
• A measured post- bronchodilator FEV1 > or = 750ml or 30% predicted and < or = 80% of predicted normal values
• Able to change COPD treatment as required by protocol

Key Exclusion Criteria:

• Women who are pregnant or lactating
• Primary diagnosis of asthma
• Alpha-1 antitrypsin deficiency as the cause of COPD
• Active pulmonary diseases
• Prior lung volume reduction surgery
• Abnormal chest X-ray (or CT scan) not due to the presence of COPD
• Hospitalized due to poorly controlled COPD within 3 months of Screening
• Clinically significant medical conditions that preclude participation in the study (e.g. clinically significant abnormal ECG, uncontrolled hypertension, glaucoma, symptomatic prostatic hypertrophy)
• Cancer that has not been in complete remission for at least 5 years
• Treatment with investigational study drug or participation in another clinical trial or study within the last 30 days or 5 half lives

Other inclusion/exclusion criteria as defined in the protocol