The antihypertensive drugs for low heart rate include dihydropyridine calcium antagonists, angiotensin-converting enzyme inhibitors and angiotensin II receptor antagonists. Dihydropyridine calcium antagonists are nifedipine; it can selectively inhibit the transmembrane transport of calcium ions into cardiomyocytes and smooth muscle cells, and inhibit the release of calcium ions from the cells, so that the vascular smooth muscle diastole, thus lowering the blood pressure, and at the same time, it can be a reflex sympathetic activity enhancement, causing an increase in the heart rate. Adverse effects include hypotension, peripheral edema, and occasionally chest pain, dizziness, and flushing. Angiotensin-converting enzyme inhibitors are captopril and benazepril; the main effect is to lower blood pressure with no effect on heart rate. The angiotensin II receptor antagonists are chlorosartan and valsartan; again the effect is to lower blood pressure and has no effect on heart rate. Therefore, the preferred antihypertensive drugs for low heart rate are dihydropyridine calcium antagonists. If blood pressure control is not satisfactory, angiotensin-converting enzyme inhibitors and angiotensin II receptor antagonists can be used in combination. However, the use of beta-blockers is prohibited because beta-blockers can slow the heart rate by blocking the beta1 receptor in the heart, which can lead to an even slower heart rate, which is detrimental to the condition. All of the above medications have adverse effects and are recommended to be used strictly under medical supervision.