Medically reviewed by Drugs.com. Last updated on Feb 6, 2022.
Commonly used brand name(s)
In the U.S.
Pharmacologic Class: Adrenergic Blocker
Uses for guanadrel
Guanadrel 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.
Guanadrel works by controlling nerve impulses along certain nerve pathways. As a result, it relaxes the blood vessels so that blood passes through them more easily. This helps to lower blood pressure.
Guanadrel is available only with your doctor's prescription.
Before using guanadrel
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 guanadrel, the following should be considered:
Tell your doctor if you have ever had any unusual or allergic reaction to guanadrel or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.
Studies on guanadrel have been done only in adult patients, and there is no specific information comparing use of guanadrel in children with use in other age groups.
Dizziness or faintness may be more likely to occur in the elderly, who are usually more sensitive to the effects of guanadrel.
There are no adequate studies in women for determining infant risk when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding.
Interactions with 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 guanadrel, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.
Using guanadrel with any of the following medicines is not recommended. Your doctor may decide not to treat you with this medication or change some of the other medicines you take.
Using guanadrel with any of the following medicines may cause an increased risk of certain side effects, but using both drugs may be the best treatment for you. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.
Interactions with food/tobacco/alcohol
Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Using alcohol or tobacco with certain medicines may also cause interactions to occur. Discuss with your healthcare professional the use of your medicine with food, alcohol, or tobacco.
Other medical problems
The presence of other medical problems may affect the use of guanadrel. Make sure you tell your doctor if you have any other medical problems, especially:
- Asthma (history of) or
- Diarrhea or
- Pheochromocytoma or
- Stomach ulcer (history of)—Guanadrel may worsen these conditions
- Fever—Effects of guanadrel may be increased
- Heart attack or stroke (recent) or
- Heart or blood vessel disease—Lowering blood pressure may make problems resulting from these conditions worse
Proper use of guanadrel
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 guanadrel 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.
The dose of guanadrel 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 guanadrel. If your dose is different, do not change it unless your doctor tells you to do so.
The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.
- For oral dosage form (tablets):
- For high blood pressure:
- Adults—At first, 5 milligrams (mg) two times a day. Then, your doctor may increase your dose to 20 to 75 mg a day, divided into two to four doses.
- Children—Use and dose must be determined by your doctor.
- For high blood pressure:
If you miss a dose of guanadrel, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not double doses.
Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing.
Keep out of the reach of children.
Do not keep outdated medicine or medicine no longer needed.
Precautions while using guanadrel
It is important that your doctor check your progress at regular visits to make sure that guanadrel is working properly.
Dizziness, lightheadedness, or fainting may occur, especially when you get up from a lying or sitting position. This may be more likely to occur in the morning. Getting up slowly may help. If you feel dizzy, sit or lie down. When you get up from lying down, sit on the edge of the bed with your feet dangling for 1 or 2 minutes. Then stand up slowly. If the problem continues or gets worse, check with your doctor.
The dizziness, lightheadedness, or fainting is also more likely to occur if you drink alcohol, stand for long periods of time, exercise, or if the weather is hot. While you are taking guanadrel, be careful to limit the amount of alcohol you drink. Also, use extra care during exercise or hot weather or if you must stand for long periods of time.
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.
Before having any kind of surgery (including dental surgery) or emergency treatment, tell the medical doctor or dentist in charge that you are taking guanadrel.
Tell your doctor if you get a fever since that may change the amount of medicine you have to take.
Guanadrel side effects
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.
Get emergency help immediately if any of the following symptoms of overdose occur:
- Blurred vision
- dizziness or faintness (severe)
Check with your doctor as soon as possible if any of the following side effects occur:
- Swelling of feet or lower legs
Less common or rare
- Chest pain
- shortness of breath
Some 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. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
- Difficulty in ejaculating
- dizziness, lightheadedness, or fainting, especially when getting up from a lying or sitting position
- unusual tiredness or weakness
- weight gain or loss (excessive)
Less common or rare
- Diarrhea or increase in bowel movements
- dryness of mouth
- muscle pain or tremors
- nighttime urination
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.
More about guanadrel
- Side effects
- Drug interactions
- Dosage information
- During pregnancy
- Drug class: antiadrenergic agents, peripherally acting
- Other brands
Related treatment guides
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.