Blood pressure is the force of blood against the walls of arteries. Blood pressure is recorded as two numbers—the systolic pressure (as the heart beats) over the diastolic pressure (as the heart relaxes between beats). The measurement is written one above or before the other, with the systolic number on top and the diastolic number on the bottom. For example, a blood pressure measurement of 120/80 mmHg (millimeters of mercury) is expressed verbally as "120 over 80."

According to recent estimates, one in four U.S. adults has high blood pressure, but because there are no symptoms, nearly one-third of these people don't know they have it. In fact, many people have high blood pressure for years without knowing it. Uncontrolled high blood pressure can lead to stroke, heart attack, heart failure or kidney failure. This is why high blood pressure is often called the "silent killer." The only way to tell if you have high blood pressure is to have your blood pressure checked.

Get the facts on high blood pressure and how to live a more heart-healthy life. Find out how you can reduce your risks for heart attack and stroke with proper monitoring by a healthcare provider and simple lifestyle changes, even if you have high blood pressure.

Normal blood pressure is less than 120 mmHg systolic and less than 80 mmHg diastolic.

High blood pressure increases your chance (or risk) for getting heart disease and/or kidney disease, and for having a stroke. It is especially dangerous because it often has no warning signs or symptoms. Regardless of race, age, or gender, anyone can develop high blood pressure. It is estimated that one in every four American adults has high blood pressure. Once high blood pressure develops, it usually lasts a lifetime. You can prevent and control high blood pressure by taking action.

In this section you will learn more about what high blood pressure is and what it does inside the body.

Blood pressure is the force of blood against the walls of arteries. Blood pressure rises and falls during the day. When blood pressure stays elevated over time, it is called high blood pressure.

The medical term for high blood pressure is hypertension. High blood pressure is dangerous because it makes the heart work too hard and contributes to atherosclerosis (hardening of the arteries). It increases the risk of heart disease and stroke, which are the first- and third-leading causes of death among Americans. High blood pressure also can result in other conditions, such as congestive heart failure, kidney disease, and blindness.

A blood pressure level of 140/90 mmHg or higher is considered high. About two-thirds of people over age 65 have high blood pressure. If your blood pressure is between 120/80 mmHg and 139/89 mmHg, then you have prehypertension. This means that you don't have high blood pressure now but are likely to develop it in the future. You can take steps to prevent high blood pressure by adopting a healthy lifestyle.

Those who do not have high blood pressure at age 55 face a 90 percent chance of developing it during their lifetimes. So high blood pressure is a condition that most people have at some point in their lives.

Blood Pressure Drugs: >>   Atenolol   Furosemide ( Lasix )   Metoprolol   Norvasc   Tenoretic   Zestril

Both numbers in a blood pressure test are important, but for people who are 50 or older, systolic pressure gives the most accurate diagnosis of high blood pressure. Systolic pressure is the top number in a blood pressure reading. It is high if it is 140 mmHg or above.

You can take steps to prevent high blood pressure by adopting a healthy lifestyle. These steps include maintaining a healthy weight; being physically active; following a healthy eating plan, that emphasizes fruits, vegetables, and lowfat dairy foods; choosing and preparing foods with less salt and sodium; and, if you drink alcoholic beverages, drinking in moderation. In this section you will learn more about healthy lifestyle habits for preventing and controlling high blood pressure.

It is important to take steps to keep your blood pressure under control. The treatment goal is blood pressure below 140/90 and lower for people with other conditions, such as diabetes and kidney disease. Adopting healthy lifestyle habits is an effective first step in both preventing and controlling high blood pressure. If lifestyle changes alone are not effective in keeping your pressure controlled, it may be necessary to add blood pressure medications. In this section you will learn about blood pressure-lowering lifestyle habits and blood pressure medications.

High blood pressure is a lifelong disease. It can usually be controlled but not cured. Once you begin to manage it and start a treatment program, maintaining a lower blood pressure is easier. By controlling your high blood pressure, you'll lower your risk of diseases like stroke, heart attack, heart failure and kidney disease. You can do it!

The first thing to do is to have your blood pressure checked. If you have high blood pressure, you can do a lot to reduce it. Work with your doctor to determine the best treatment for you.

It may include a reducing the fat (particularly saturated fat) in your diet, eating less salt, and changing your lifestyle by losing weight and getting regular physical activity.

Quitting smoking is also important to reduce your overall risk for heart attack and stroke.

Your doctor may recommend reducing how much alcohol you drink.

Many medicines also can help reduce and control high blood pressure. Your doctor will decide whether you need medicine in addition to dietary and lifestyle changes.

Be sure to look at our patient education sheets on high blood pressure. These can be printed out and taken to your physician. There are spaces for you to ask questions and for your physician to write special instructions for you.

Possible Side Effects of Drugs That Lower Blood Pressure

Some of the drugs listed below can affect certain functions of the body, resulting in bad side effects. However, drugs that lower blood pressure have proven effective over the years. The benefits of using them far outweigh the risk of side effects. Most people who’ve taken these drugs haven’t had any problems.

Diuretics — Some of these drugs may decrease your body's supply of a mineral called potassium. Symptoms such as weakness, leg cramps or being tired may result. Eating foods containing potassium may help prevent significant potassium loss. You can prevent potassium loss by taking a liquid or tablet that has potassium along with the diuretic, if your doctor recommends it. Diuretics such as amiloride (Midamar), spironolactone (Aldactone) or triamterene (Dyrenium) are called "potassium sparing" agents. They don’t cause the body to lose potassium. They might be prescribed alone but are usually used with another diuretic. Some of these combinations are Aldactazide, Dyazide, Maxzide or Moduretic.

Some people suffer from attacks of gout after prolonged treatment with diuretics. This side effect isn't common and can be managed by other treatment.

In people with diabetes, diuretic drugs may increase the blood sugar level. A change in drug, diet, insulin or oral antidiabetic dosage corrects this in most cases. Your doctor can change your treatment. Most of the time the degree of increase in blood sugar isn't much. Impotence may also occur in a small percentage of people.

Beta-blockers — Acebutolol (Sectral), atenolol (Tenormin), metoprolol (Lopressor), nadolol (Corgard), pindolol (Visken), propranolol (Inderal) or timolol (Blocadren) may cause insomnia, cold hands and feet, tiredness or depression, a slow heartbeat or symptoms of asthma. Impotence may occur. If you have diabetes and you’re taking insulin, have your responses to therapy monitored closely.

ACE inhibitors — These drugs, such as captopril (Capoten), enalapril (Vasotec), lisinopril (Zestril or Prinivil), may cause a skin rash; loss of taste; a chronic dry, hacking cough; and in rare instances, kidney damage.

Angiotensin II receptor blockers — These drugs may cause occasional dizziness.

Calcium channel blockers — Diltiazem (Cardizem), nicardipine (Cardene), Nifedipine (Procardia) and verapamil (Calan or Isoptin) may cause palpitations, swollen ankles, constipation, headache or dizziness. Side effects with each of these drugs differ a great deal.

Alpha blockers — These drugs may cause fast heart rate, dizziness or a drop in blood pressure when you stand up.

Combined alpha and beta blockers — People taking these drugs may experience a drop in blood pressure when they stand up.

Central agonists — Alpha methyldopa (Aldomet) may produce a greater drop in blood pressure when you're in an upright position (standing or walking) and may make you feel weak or faint if the pressure has been lowered too far. This drug may also cause drowsiness or sluggishness, dryness of the mouth, fever or anemia. Male patients may experience impotence. If this side effect persists, your doctor may have to change the drug dosage or use another medication.

Clonidine (Catapres), guanabenz (Wytensin) or guanfacine (Tenex) may produce severe dryness of the mouth, constipation or drowsiness. If you're taking any of these drugs, don’t stop suddenly, because your blood pressure may rise quickly to dangerously high levels.

Peripheral adrenergic inhibitors — Reserpine may cause a stuffy nose, diarrhea or heartburn. These effects aren't severe and no treatment is required other than to change the amount of drugs taken. If you have nightmares or insomnia or get depressed, tell your doctor. You should stop using the drugs.

Guanadrel (Hylorel) or guanethidine (Ismelin) may cause some diarrhea, which may persist in some people. This side effect usually becomes less of a problem if you continue treatment.

These drugs reduce blood pressure more when you stand. Consequently, you may get dizzy and lightheaded and feel weak when you get out of bed in the morning or stand up suddenly. If you notice any of these reactions — and if they persist for more than a minute or two — sit or lie down and either reduce or omit the next dose of the drug. If symptoms continue, contact your doctor.

When you're taking guanethidine, don't keep standing in the hot sun or at a social gathering if you begin to feel faint or weak. These activities cause low blood pressure. Male patients may experience impotence. Contact your doctor if this occurs. These drugs are rarely used unless other medications don’t help.

Blood vessel dilators — Hydralzine (Apresoline) may cause headaches, swelling around the eyes, heart palpitations or aches and pains in the joints. Usually none of these symptoms are severe, and most will go away after a few weeks of treatment. This drug isn't usually used by itself. Minoxidil (Loniten) is a potent drug that's usually used only in resistant cases of severe high blood pressure. It may cause fluid retention (marked weight gain) or excessive hair growth.

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