Verapamil administered intravenously is recommended as a first-line therapy in patients with supraventricular tachycardia. However, these patients may suffer from tachycardia-induced heart failure and particular caution is needed before prescription of verapamil in these cases. We present a case of fulminant acute heart failure following intravenous bolus administration of verapamil in a previously healthy young man. This case stresses the potential deleterious effects of this commonly prescribed drug.