The most common and common adverse effect of all hypertensive drugs is that they can cause hypotension, there are several kinds of antihypertensive drugs, and for patients with poor control of a drug, the principle of combination drugs is often used clinically, different types of adverse reactions. 1, ACEI, ARB class, these drugs are commonly used in hypertensive patients, the most common adverse reaction is that they can cause irritating dry cough. 2, CCB class also The most common adverse reaction is irritation and dry cough. 2, CCB class is also calcium antagonists, which can also cause some side effects such as facial flushing, dizziness, nausea, ankle edema and other vasodilatation. 3, beta-blockers, which often have a slow heart rate after taking. 4, diuretics, all potassium diuretics can lead to electrolyte disorders, causing hypokalemia, hyponatremia, etc., which can cause serious kidney damage, so they should be taken together with potassium-protective diuretics. 5, some Some central antihypertensive drugs can cause obvious hypotensive reactions, and reflex hypertension will appear after stopping the drug, which has been used sparingly.