Usually, the goal is to keep your blood pressure below 140/90 mmHg (130/80 mmHg if you have diabetes or chronic kidney disease). Ask your doctor what your blood pressure goal should be.

Some people can prevent or control high blood pressure by changing to healthier habits, such as:

• Following the DASH (Dietary Approaches to Stop Hypertension) Eating Plan, which includes cutting down on salt and sodium and eating healthy foods such as fruits, vegetables, and low-fat dairy products
• Losing excess weight and staying at a healthy weight
• Being physically active (for example, walking 30 minutes every day)
• Quitting smoking
• Limiting alcohol intake

Sometimes blood pressure stays too high even when a person makes these kinds of healthy changes. In that case, it is necessary to add medicine to help lower blood pressure. Medicines will control your blood pressure, but they cannot cure it. You will need to take blood pressure medicine for a long time.

Blood pressure medicines work in different ways to lower blood pressure. Often, two or more medicines work better than one. Some medicines lower blood pressure by removing extra fluid and salt from your body. Others affect blood pressure by slowing down the heartbeat or by relaxing and widening blood vessels.

Src: http://www.nhlbi.nih.gov/