Isoboldine should be known as isobarbital, and the generic name is verapamil hydrochloride, which is a calcium channel blocker. Isoboldine is an antihypertensive and antiarrhythmic drug. Oral Isoboldine is generally used for the treatment of atrial premature beats or for the prevention of supraventricular tachycardia, hypertrophic cardiomyopathy, mild-to-moderate hypertension, and esophageal cardia relaxation. Intravenous injections are used to terminate tip-twisting ventricular tachycardia, as well as to convert fast atrial fibrillation and paroxysmal supraventricular tachycardia. The rational use of isobarbital must follow the doctor’s advice, not to adjust the dose, in addition, during the use of the drug, pay attention to monitor the blood pressure and heart rate, in order to avoid arrhythmia, dizziness, mild headache, nausea, hypotension and other adverse reactions, if there are uncomfortable symptoms during the use of the drug, stop the drug in time, and consult a doctor for examination. Contraindications: Severe left ventricular insufficiency. Hypotension (systolic blood pressure less than 90mmHg) or cardiogenic shock. Sick sinus syndrome (except in patients with installed and functioning pacemakers). Degree II or III atrioventricular block (except in patients with an installed and functioning pacemaker). Patients with atrial flutter or atrial fibrillation with combined atrioventricular bypass access. Patients with known hypersensitivity to verapamil hydrochloride. It is recommended to seek prompt medical attention for relevant examinations and, depending on the circumstances, symptomatic treatment under the guidance of a doctor.