Amlodipine belongs to the calcium antagonist, usually for the vascular smooth muscle has a strong selective effect, can directly relax the vascular smooth muscle, reduce peripheral vascular resistance, is a clinically used antihypertensive drugs, the side effects are as follows: 1, can cause dyspepsia, will make the gastrointestinal tract has obvious burning sensation, especially for the previous gastroduodenal ulcer patients should be cautious to take. 2, there will be skin allergic reactions, such as severe skin allergic urticaria. 3, patients will have drowsiness when taking large amounts for a long time. 4, patients will have, for example, facial flushing, palpitations, sinus heart rate. Allergic reactions to the skin, such as skin allergic urticaria in severe cases. 3, patients who take a large amount of long-term side effects of drowsiness. 4, patients will appear, such as facial flushing, palpitations, sinus tachycardia side effects. 5, rare side effects, can cause some patients to appear increased alkaline phosphatase.