It is usually better to take antihypertensive medication at 6 to 10 a.m. The reason for this is that there are diurnal fluctuations and rhythms in blood pressure, and most people’s blood pressure peaks once in the morning, at 6 to 10 a.m. Generally older people with age, blood vessel hardening, blood pressure will be higher than the young and middle-aged people, if the blood pressure in more than one day time measurements of 140/90mmHg or more, then you need to take antihypertensive drug treatment, usually once a day in the early morning when taken. The normal value of blood pressure in normal adults is less than 120mmHg systolic blood pressure, diastolic blood pressure is less than 80mmHg, there are differences in different ages, physiological conditions and gender of the population, it is best to go to a regular medical institution, after diagnosis of hypertension, under the guidance of the doctor to use medication.