Inclusion Criteria:  Male or female patients ≥ 40 years of age Documented diagnosis of IPF  Exclusion Criteria:  History of clinically significant cardiovascular disease, including myocardial infarction, unstable ischemic heart disease, congestive heart failure, or angina during the 6 months before screening Sinoatrial or atrioventricular block, uncontrolled hypertension Active bleeding or current clinically significant coagulopathy