A often represents ACEI or ARB antihypertensive drugs, the representative drugs are fosinopril, benazepril, colesartan, valsartan, etc. B represents beta-blockers, the representative drugs are bisoprolol, propranolol, metoprolol, etc. C represents calcium channel blockers, the representative drugs are nifedipine, felodipine, amlodipine, D represents diuretics, the representative drugs are hydrochlorothiazide. These drugs are the first-line antihypertensive drugs, which are also widely used in clinical practice and have relatively few side effects. At present, in addition to these major types of antihypertensive drugs, there are also less commonly used antihypertensive drugs, such as colistin and reserpine. There are also compound preparations, such as compound rooibos, these drugs are currently used less in the clinic.