The time to take the drug must follow the characteristics of rising blood pressure, the Chinese people will mostly have two peaks, generally 6-8 am, 6-8 pm will also have a second peak: 1, morning: the recommended time to take antihypertensive drugs is to take in the morning after waking up, some patients, especially when waking up in the morning, sympathetic excitement, when blood pressure will suddenly rise, especially some of the elderly, such patients get up after Must be less active, should take the drug first; 2, night: there are some drugs, such as alpha blockers, can lead to postural hypotension, such drugs are recommended to be taken before bedtime, mainly to reduce postural hypotension caused by dizziness and other discomfort. In fact, most patients have blood pressure fluctuations, but some have their own characteristics and may also have a sudden rise in blood pressure at noon. In this case, adjusting the time of oral administration of antihypertensive drugs according to the individualized differences of each patient, and taking them before the rise in blood pressure as much as possible, may help to ensure that the blood pressure is relatively stable within 24 hours, in order to effectively protect the target organs.