Hypersensitivity. Immunodeficient state. Patients who in the last 6 mth experienced MI, unstable angina, stroke, transient ischaemic attack, decompensated heart failure requiring hospitalization or NYHA class III/IV heart failure. History or presence of 2nd-degree AV block type II or 3rd-degree AV block or sick sinus syndrome unless patient has functioning pacemaker. Severe active infections, active chronic infections (eg, hepatitis & TB). Active malignancies. Concomitant use w/ MAOIs. Severe hepatic impairment (Child-Pugh class C). Women of childbearing potential not using effective contraception. Pregnancy.