Nifedipine extended-release tablets, a calcium antagonist, are made from nifedipine regular tablets through extended-release technology, which allows nifedipine to be slowly released into the bloodstream after taking the drug to achieve a stable blood concentration, which continues to lower blood pressure in patients with hypertension. Nifedipine extended-release tablets generally take effect in about 1-2 hours after consumption, resulting in a drop in blood pressure. Nifedipine extended-release tablets are an excellent treatment for middle-aged and elderly patients with predominantly sclerotic blood vessels, especially those with hypertension who have elevated systolic blood pressure alone. It will lower systolic blood pressure and reduce peripheral resistance, which will have a good effect on blood pressure. Generally nifedipine extended-release tablets, the effect can last for about 12 hours, need to take twice a day.