See if you fall into the high BP category or low BP. The normal blood pressure of a person should be 120/80 mmHg. If it goes above this by 10 -15, some doctors may prescribe medicines but if it is as high as 230/135 mmHg, medication is a must to prevent heart attack and stroke.
Also it shouldn't go as low as 50/35 mmHg, where too the medication is a must.