Hypersensitivity. Severe coronary heart disease or unstable angina. MI w/in the last 6 mth. Decompensated cardiac failure if not under close medical supervision. Severe arrhythmias. Cerebrovascular events (eg, transient ischaemic attack, stroke) w/in the last 3 mth. Congenital or acquired valvular defects w/ clinically relevant myocardial function disorders not related to pulmonary HTN. Concomitant use of strong CYP2C8 inhibitors (eg, gemfibrozil). Severe hepatic impairment (Child-Pugh class C).