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Some commonly used brand names are:
In the U.S.—
Guanabenz (GWAHN-a-benz) belongs to the general class of medicines called antihypertensives. It is used to treat high blood pressure (hypertension).
High blood pressure adds to the work load of the heart and arteries. If it continues for a long time, the heart and arteries may not function properly. This can damage the blood vessels of the brain, heart, and kidneys, resulting in a stroke, heart failure, or kidney failure. High blood pressure may also increase the risk of heart attacks. These problems may be less likely to occur if blood pressure is controlled.
Guanabenz works by controlling nerve impulses along certain nerve pathways. As a result, it relaxes blood vessels so that blood passes through them more easily. This helps to lower blood pressure.
Guanabenz is available only with your doctor"s prescription, in the following dosage form:
Before Using This Medicine
In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For guanabenz, the following should be considered:
Allergies—Tell your doctor if you have ever had any unusual or allergic reaction to guanabenz. Also tell your health care professional if you are allergic to any other substance, such as foods, preservatives, or dyes.
Pregnancy—Guanabenz has not been studied in pregnant women. However, studies in rats have shown that guanabenz given in doses 9 to 10 times the maximum human dose caused a decrease in fertility. In addition, 3 to 6 times the maximum human dose caused birth defects (in the skeleton) in mice, and 6 to 9 times the maximum human dose caused death of the fetus in rats. Before taking this medicine, make sure your doctor knows if you are pregnant or if you may become pregnant.
Breast-feeding—It is not known whether guanabenz passes into the breast milk. However, this medicine has not been reported to cause problems in nursing babies.
Children—Studies on this medicine have been done only in adult patients, and there is no specific information comparing use of guanabenz in children with use in other age groups.
Older adults—Many medicines have not been studied specifically in older people. Therefore, it may not be known whether they work exactly the same way they do in younger adults or if they cause different side effects or problems in older people. There is no specific information comparing use of guanabenz in the elderly with use in other age groups. However, dizziness, faintness, or drowsiness may be more likely to occur in the elderly, who are usually more sensitive to the effects of guanabenz.
Other medicines—Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are taking guanabenz, it is especially important that your health care professional know if you are taking any of the following:
Other medical problems—The presence of other medical problems may affect the use of guanabenz. Make sure you tell your doctor if you have any other medical problems, especially:
Proper Use of This Medicine
In addition to the use of the medicine your doctor has prescribed, treatment for your high blood pressure may include weight control and care in the types of foods you eat, especially foods high in sodium. Your doctor will tell you which of these are most important for you. You should check with your doctor before changing your diet.
Many patients who have high blood pressure will not notice any signs of the problem. In fact, many may feel normal. It is very important that you take your medicine exactly as directed and that you keep your appointments with your doctor even if you feel well.
Remember that this medicine will not cure your high blood pressure but it does help control it. Therefore, you must continue to take it as directed if you expect to lower your blood pressure and keep it down. You may have to take high blood pressure medicine for the rest of your life . If high blood pressure is not treated, it can cause serious problems such as heart failure, blood vessel disease, stroke, or kidney disease.
To help you remember to take your medicine, try to get into the habit of taking it at the same time each day.
Dosing—The dose of guanabenz will be different for different patients. Follow your doctor"s orders or the directions on the label . The following information includes only the average doses of guanabenz. If your dose is different, do not change it unless your doctor tells you to do so.
The number of tablets that you take depends on the strength of the medicine.
Storage—To store this medicine:
Precautions While Using This Medicine
It is important that your doctor check your progress at regular visits to make sure that this medicine is working properly.
Check with your doctor before you stop taking guanabenz. Your doctor may want you to reduce gradually the amount you are taking before stopping completely.
Before having any kind of surgery (including dental surgery) or emergency treatment, tell the medical doctor or dentist in charge that you are using this medicine.
Do not take other medicines unless they have been discussed with your doctor . This especially includes over-the-counter (nonprescription) medicines for appetite control, asthma, colds, cough, hay fever, or sinus problems, since they may tend to increase your blood pressure.
Guanabenz will add to the effects of alcohol and other CNS depressants (medicines that slow down the nervous system, possibly causing drowsiness). Some examples of CNS depressants are antihistamines or medicine for hay fever, other allergies, or colds; sedatives, tranquilizers, or sleeping medicine; prescription pain medicine or narcotics; barbiturates; medicine for seizures; muscle relaxants; or anesthetics, including some dental anesthetics. Check with your doctor before taking any of the above while you are using this medicine .
Guanabenz may cause some people to become dizzy, drowsy, or less alert than they are normally. Make sure you know how you react to this medicine before you drive, use machines, or do anything else that could be dangerous if you are dizzy or are not alert .
Guanabenz may cause dryness of the mouth, nose, and throat. For temporary relief of mouth dryness, use sugarless candy or gum, melt bits of ice in your mouth, or use a saliva substitute. However, if your mouth continues to feel dry for more than 2 weeks, check with your medical doctor or dentist. Continuing dryness of the mouth may increase the chance of dental disease, including tooth decay, gum disease, and fungus infections.
Side Effects of This Medicine
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor as soon as possible if any of the following side effects occur:
Signs and symptoms of overdose
Dizziness (severe); irritability; nervousness; pinpoint pupils; slow heartbeat; unusual tiredness or weakness
Other side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. However, check with your doctor if any of the following side effects continue or are bothersome:
Dizziness; drowsiness; dryness of mouth; weakness
Less common or rare
Decreased sexual ability; headache; nausea
After you have been using this medicine for a while, unpleasant effects may occur if you stop taking it too suddenly. After you stop taking this medicine, check with your doctor if any of the following effects occur:
Anxiety or tenseness; chest pain; fast or irregular heartbeat; headache; increased salivation; increase in sweating; nausea or vomiting; nervousness or restlessness; shaking or trembling of hands or fingers; stomach cramps; trouble in sleeping
Other side effects not listed above may also occur in some patients. If you notice any other effects, check with your doctor.
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