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  Systolic blood pressure below 120 mm Hg and diastolic blood pressure below 80 mm Hg are normal blood pressure levels. If the systolic is 140 mm Hg or more or if the diastolic is 90 mm Hg or more or if both systolic and diastolic are above this level then it is called high blood pressure . If blood pressure is found in the middle level, it is called pre-hypertension. How to measure:   Do not drink tea, coffee, or smoke for at least half an hour before measuring blood pressure. Blood pressure should be measured after at least five minutes of rest. The legs should be placed on the floor and the hands should be placed on the front table or chair. The cuff of the blood pressure meter should be tied one inch above the elbow fold. Now automated blood pressure measuring instruments are also available. When to take medicine Regular exercise, changes in eating habits, weight control, and smoking cessation are sufficient for pre-hypertension. Prescription is generally required on the off chan