Felodipine extended-release tablets are long-acting antihypertensive drugs because they are extended-release tablets. Extended-release tablets are made by adding a structure or drug skeleton that allows for the gradual release of the drug, so that the effect of gradual release of the drug can be achieved and the blood concentration can be kept relatively stable to achieve a smooth 24-hour blood pressure reduction. Felodipine is a dihydropyridine calcium channel blocker, which reduces the entry of extracellular calcium ions into vascular smooth muscle cells by blocking L-type calcium channels, thereby reducing the contraction of resistance vessels and lowering blood pressure. In the clinical selection of antihypertensive drugs, it is necessary to give preference to long-acting antihypertensive drugs, which can achieve the purpose of smoothly lowering blood pressure and preventing blood pressure fluctuations.