Calcium antagonist is a general term for a class of drugs whose mechanism of action is to affect calcium ion channels on the heart and large blood vessels. Calcium ion antagonists are most often used in the treatment of diseases such as hypertension and arrhythmia. Ion channels exist on the heart and blood vessels themselves, and perform their physiological functions by regulating the levels of ions inside and outside the cell. By calcium ion antagonists can reduce the flow of extracellular calcium, to the intracellular, thus inhibiting the contraction of cardiomyocytes, and at the same time inhibit the concentration of calcium ions in the blood vessels. Lowering the patient’s blood pressure by this type of method can have the effect of lowering blood pressure by dilating the blood vessels and inhibiting the myocardium to a certain extent. It can also reduce, or inhibit to a certain extent, the cardiac electrical conduction and function of the sinus node and AV node, and play a corresponding therapeutic role. All drugs should be used under the guidance of a specialist.