How long it takes for felodipine extended-release tablets to lower your blood pressure to normal varies from a few hours to about two weeks. Felodipine extended-release tablets are calcium antagonists, which usually work within 2 hours and last for about 24 hours. So if you have only mild hypertension and are sensitive to the drug, your blood pressure may drop to normal after a few hours. However, it takes longer for felodipine extended-release tablets to reach their maximum therapeutic effect, and it is not recommended to adjust the dosage of the drug too often, usually at intervals of two weeks or more, so the drug needs to be taken for about two weeks before it reaches its maximum effect and the blood pressure falls to normal. Felodipine extended-release tablets can cause adverse reactions such as palpitations, flushing, headaches, etc., and are contraindicated in cases of decompensated heart failure, acute infarction, allergies, as well as in women during pregnancy. It should also be pointed out that people with severe hypertension may not have their blood pressure reduced to normal by simply taking this product, and may need to increase the dosage of felodipine extended-release tablets or combine it with other kinds of antihypertensive drugs for treatment. It is recommended that the product be taken under the supervision of a physician.