Diltiazem generally refers to diltiazem hydrochloride tablets, with coronary heart disease is generally can be taken for a long time under the guidance of a doctor. Diltiazem Hydrochloride Tablets belong to calcium channel blockers, with dilation of blood vessels, lower blood pressure, can be used to treat angina pectoris and exertional angina pectoris caused by coronary artery spasm, as well as hypertension, hypertrophic cardiomyopathy and so on. Patients can usually use the drug for a long time to treat coronary heart disease, but it should be noted that prolonged overdose may result in bradycardia, low blood pressure and other phenomena, so it is necessary to pay attention to monitor the changes of blood pressure and heart rate in daily life. Other common adverse reactions include swelling, headache, nausea, dizziness, rash, weakness, etc. Seek medical attention promptly for any discomfort. Allergic to the drug, sick sinus node syndrome, II or III degree atrioventricular block without a pacemaker, patients with systolic blood pressure less than 90 mmHg, acute myocardial infarction or pulmonary congestion should be prohibited from using the drug. Specific use of the drug should be in accordance with medical advice.