Alum has no antihypertensive effect on hypertensive patients. Alum is used for detoxifying, clearing heat, killing insects, stopping itching, and stopping diarrhea, and is used for snake and insect bites, itching skin, pain relief, and diarrhea. Alum has no antihypertensive effect on hypertension, and the antihypertensive effect depends on antihypertensive drugs to complete. There are generally many types of antihypertensive drugs selected, in clinical practice there are roughly five major classes of antihypertensive drugs, diuretics such as hydrochlorothiazide, indapamide, etc., calcium antagonists such as amlodipine, nifedipine controlled-release tablets, felodipine extended-release tablets, beta-blockers such as metoprolol, bisoprolol, etc., angiotensin-converting enzyme inhibitors such as benazepril, fosinopril, enalapril, etc., angiotensin II receptor antagonists such as er angiotensin II receptor antagonists such as irbesartan, candesartan, valsartan, etc.