Blood pressure can be measured half an hour to an hour after taking an antihypertensive drug.
If you are taking a short-acting antihypertensive drug, it will take about half an hour to work. If it is a long-acting drug, it usually takes one to two hours to work. During the period when the blood pressure does not return to the normal range, try to stay calm and reduce activity.
Also if the patient has been taking the drug for some time and has good blood pressure control, a spot check can be done at any time of the day to check that it is within the normal blood pressure range. Measuring blood pressure should be avoided after emotional stress, excitement, or strenuous exercise. If necessary, 24-hour ambulatory blood pressure monitoring, blood pressure fluctuations in a timely manner to seek medical attention, help better selection of oral antihypertensive drugs.