Antihypertensive drugs are more varied, the effect time can be a few minutes to 3 hours, need to be based on specific drugs, specific analysis. 1. short-acting antihypertensive drugs: generally take a few minutes can play the effect of lowering blood pressure, the effect of the drug is generally maintained for a shorter period of time, generally for a few hours, this kind of drug is generally not recommended for long-term use, generally only in the case of emergency to follow the instructions of the doctor to take, the common drugs are nifedipine tablets, and so on. 2. Medium-acting antihypertensive drugs: generally this kind of drug effect time is slower than the short-acting antihypertensive drugs, generally in half an hour to 1 hour effect, the effect of the drug to maintain a longer, common drugs are enalapril, nifedipine extended-release tablets and so on. 3. Long-acting antihypertensive drugs: these antihypertensive drugs have a slower effect, generally by changing the body’s body fluids and nerve factors to regulate blood pressure, the effect of time is generally in 2 to 3 hours, blood pressure control is relatively stable. Common drugs are valsartan, candesartan ester and so on. Antihypertensive drugs, it is recommended that under the guidance of a doctor to carry out a reasonable use of medication, medication to follow the principle of individualization, part of the drug effect is slower, do not arbitrarily increase the amount of advice, it is recommended to follow the doctor’s instructions.