Blood pressure can be reduced to normal after taking antihypertensive drugs for about 30-120 minutes. Antihypertensive drugs are divided into fast-acting, medium- and long-acting and long-acting drugs. Generally, fast-acting antihypertensive drugs lower blood pressure relatively quickly, and can lower blood pressure rapidly in about 30 minutes, but the maintenance time is relatively short, and may lose its antihypertensive effect in about 4 hours, such as nifedipine tablets, etc. They are suitable for patients whose blood pressure is particularly high at present and need to lower blood pressure rapidly. And if the blood pressure is usually at a medium to high risk level, take medium to long-acting antihypertensive drugs, such as enalapril maleate, compound reserpine, aminopterin tablets, valsartan capsules, felodipine extended-release tablets, benazepril tablets, amlodipine benzoate and other drugs, which can lower blood pressure relatively smoothly.