a diagnosis of thyrotoxicosis (due to the known class side effect profile of ß2-agonists) a diagnosis of paroxysmal tachycardia - Patients with any of the following conditions: a history of myocardial infarction within 1 year of screening visit a diagnosis of clinically relevant cardiac arrhythmia a malignancy for which patient has undergone resection, radiation therapy or chemotherapy within last five years