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Firstly you need to modify your diet and exercise as well. Stop eating junk food, fatty food, pastries, colas, pizzas. Eat more of fresh fruits and vegetables everyday like banana, orange, chikoos etc. Eat pulses, cereal like oats. Add fresh green leafy vegetables in the diet for antioxidant effect and proper fitness. Drink enough water. Do brisk walking for 40 minutes a day. Try this for 1-2 months and check your blood pressure when you are at rest for 15 minutes and have not smoked, drunk alcohol or coffee within the previous 1 hour. Contact your Doctor regarding this and you may be put on an anti-hypertensive depending on other risk factors like obesity, diabetes
, renal function tests etc.