Calcium antagonists are clinically used to treat coronary heart disease, angina pectoris, and hypertension, and are a very common class of drugs in clinical practice. The main drugs include nifedipine extended-release tablets, felodipine, lacidipine, amlodipine, nicardipine, diltiazem, verapamil and so on. Drugs such as diphenhydramine are used to control hypertension and lower blood pressure, while diltiazem and verapamil are mainly used to treat cardiac arrhythmias and coronary artery-induced angina. In case of hypertension as well as coronary artery disease and angina pectoris, it is important to regularly quantify the medical history, take calcium antagonists, and adjust the dose of the medication according to the blood pressure and the condition of the disease.