A case history of treatment with verapamil for verapamil-sensitive ventricular tachycardia with a left bundle branch block pattern is reported. Verapamil suppresses and prevents supraventricular tachycardias. Idiopathic ventricular tachycardias of the left ventricular outflow tract origin are verapamil sensitive. In this case sustained ventricular tachycardia was developed suddenly a year later after ablation, despite the treatment with low dosage verapamil (80 mg/tid). The restoration of Sinus rhythm was not obtained by electrical cardioversion, but was achieved with high dosage verapamil (360 mg/daily). This case proves pharmacological therapy with verapamil is still the treatment of choice for idiopathic left ventricular tachycardia because of a good long term prognosis. Radiofrequency ablation is effective and safe with no complication recorded.