Nifedipine extended-release tablets are effective in lowering blood pressure, reducing myocardial oxygen consumption, and so on. The side effects of the drug include headache, flushing, lower limb edema and tachycardia. 1. The efficacy of nifedipine extended-release tablets: nifedipine extended-release tablets are mainly composed of nifedipine, which is a kind of calcium antagonist, the drug has the effect of dilating blood vessels, so it can be used to reduce blood pressure. The drug can increase the blood supply to the coronary arteries and reduce the oxygen consumption of the heart muscle, thus helping to relieve many types of angina. 2. Side effects of nifedipine extended-release tablets: the more common adverse reactions, including headache, dizziness, redness of the face and bilateral lower limb edema, etc. A very small number of people may also experience tachycardia, nausea, diarrhea and itching of the skin and so on. In order to ensure the safety of the drug, the use of nifedipine extended-release tablets in the process of treatment must strictly follow the doctor’s instructions.