Clinically, digitalis drugs are often used as cardiotonic agents to treat patients with heart failure, of which oral drugs are mainly digoxin, and the choice of therapeutic drugs should be under the guidance of a doctor. Heart failure refers to the heart at that time can not beat with the venous return and body tissue metabolism of the blood supply commensurate with the need for patients with heart failure need to use positive inotropic drugs treatment, oral drugs to digoxin-based, digoxin can increase myocardial contractility to increase the left ventricular ejection fraction and improve the symptoms of heart failure. 1. Indications: For the treatment of mild to moderate heart failure, control of ventricular rate and supraventricular tachycardia in patients with atrial fibrillation and atrial flutter accompanied by rapid ventricular rate. 2. Contraindications: forbidden to be used in combination with calcium injection; prohibited for those who are poisoned by digitalis preparations; prohibited for patients with ventricular tachycardia and ventricular fibrillation; prohibited for patients with hypertrophic obstructive cardiomyopathy and pre-excitation syndrome with atrial fibrillation or flutter. 3. Precautions: digoxin treatment of preexcitation syndrome patients have the risk of ventricular fibrillation; digoxin can cause severe sinus bradycardia or atrioventricular block; signs and symptoms of digoxin intoxication include gastrointestinal reactions, visual changes and arrhythmias; atrial fibrillation electrical resuscitation should be reduced or discontinued within 1 to 2 days before digoxin; acute myocardial infarction patients, renal insufficiency, patients with caution with digoxin. Patients should combine the characteristics of their own condition and choose the appropriate treatment plan under the guidance of the doctor, please use the drug under the guidance of the doctor.