Betaloc® ZOK 50 mg prolonged release tablet is a beta-blocker. Therapeutic indications: Adults Hypertension. Angina pectoris. Stable symptomatic chronic heart failure with impaired systolic left ventricular function. Prevention of cardiac death and reinfarction after the acute phase of myocardial infarction. Cardiac arrhythmias especially including supraventricular tachycardia reduction of ventricular rate in atrial fibrillation and in ventricular extrasystoles. Functional heart disorders with palpitations. Migraine prophylaxis. Children and adolescents aged 6-18 years: Treatment of hypertension.