Felodipine extended-release tablets, is a calcium antagonist class of antihypertensive drugs, side effects are common for headache, palpitations, flushing, edema and so on. Felodipine extended-release tablets, has the effect of vasodilatation, head vasodilatation, causing headache; vasodilatation causes palpitations; facial vasodilatation, causing flushing; capillary dilatation, causing edema, especially ankle edema. Affects the digestive tract, causing nausea, abdominal pain and so on. Affects the skin, causing rash, itching, etc. May also cause arthralgia and myalgia. The use of this drug is contraindicated in patients who are allergic to the components of felodipine, or in patients with decompensated heart failure, acute myocardial infarction, unstable angina pectoris, and also in pregnant women. If side effects occur with oral administration of felodipine extended-release tablets, it is recommended to go to the hospital in time, combined with the condition of the patient, adjust the medication to avoid serious side effects harmful to health.