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What is Phenoxybenzamine used for?

Phenoxybenzamine is used to treat high blood pressure and sweating caused by a disease called pheochromocytoma (a type of tumor of the adrenal glands). Phenoxybenzamine belongs to a class of medications known as alpha blockers. It works by relaxing and widening blood vessels, which lets the blood to flow more easily, thereby lowering the high blood pressure. This medicine may also be used to treat other conditions as determined by your doctor.

What is the recommended dosage of Phenoxybenzamine?

The dosage of Phenoxybenzamine prescribed to each patient will vary. Always follow your physician’s instructions and/or the directions on the prescription drug label.

Phenoxybenzamine can be taken with or without food. Take Phenoxybenzamine by mouth with a full glass of water.

What if you miss a dose of Phenoxybenzamine?

If your physician has instructed or directed you to take Phenoxybenzamine medication in a regular schedule and you have missed a dose of this medicine, take it as soon as you remember. However, if it is almost time for your next dose, then skip the missed dose and go back to your regular dosing schedule. Do not double the doses unless otherwise directed.

What if you overdose on Phenoxybenzamine?

Any medication taken in excess can have serious consequences. If you suspect an overdose of Phenoxybenzamine, seek medical attention immediately. Overdose symptoms of Phenoxybenzamine may include fainting, fast heart rate, severe weakness and dizziness.

What other drugs could interact with Phenoxybenzamine?

It may be noted that drugs other than those listed above may also interact with Phenoxybenzamine.

Usually drug interactions occur when it is taken with another drug or with food. Before you take a medication for a particular ailment, you should inform the health expert about intake of any other medications including non-prescription medications (over-the-counter products) and dietary supplements like vitamins, minerals and herbal, which may increase the effect of Phenoxybenzamine, so that the doctor can warn you of any possible drug interactions.

Phenoxybenzamine can interact with other high blood pressure medications, erectile dysfunction medications, muscle relaxants, antiseizure drugs and psychiatric medicines.

Do let your doctor know if you smoke, consume alcohol or caffeinated drinks, or use illegal drugs as these may interfere with the action of your medication. Make sure to inform your doctor of any medical conditions you may have, or any family history of medical problems. Do not start or stop using any medicine without consulting your doctor.

What are the side effects of Phenoxybenzamine?

Like other medicines, Phenoxybenzamine can cause some side effects. If they do occur, the side effects of Phenoxybenzamine are most likely to be minor and temporary. However, some may be serious and may require the individual to inform the doctor or visit the nearest hospital immediately.

It is pertinent to note that side effects of Phenoxybenzamine cannot be anticipated. If any side effects of Phenoxybenzamine develop or change in intensity, the doctor should be informed as soon as possible.

Phenoxybenzamine can cause side effects such as dizziness, tiredness, drowsiness, stuffy nose, stomach upset and sexual dysfunction. This is not a complete list of all side effects. Do concur with your doctor and follow his directions completely when you are taking Phenoxybenzamine.

What are the questions to ask your doctor before taking Phenoxybenzamine?

Is it possible for me to take Phenoxybenzamine with other drugs?
Should certain beverages, foods and other products be avoided when I take Phenoxybenzamine?
What are the possible drug interactions of Phenoxybenzamine?
How will Phenoxybenzamine work in my body?
How should Phenoxybenzamine be taken?
How to reduce the risk of Phenoxybenzamine drug interactions and side effects?


The health and medical information provided here is intended to supplement and not substitute for the expertise and judgment of your physician, pharmacists or other health care professional. It should not be understood to indicate that the use of Phenoxybenzamine is safe, appropriate or effective for you. Always consult your health care professional before using this, or any other, drug.

Before taking Phenoxybenzamine, inform your doctor if you are pregnant, planning to become pregnant, or are breast-feeding. Also tell your doctor if you have kidney problems, heart problems, blood vessel disease and a lung or respiratory tract infection. Before having dental surgery, tell the dentist that you are using Phenoxybenzamine.


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