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phenoxybenzamine

Pronunciation: fen OX ee BENZ a meen

Brand: Dibenzyline

Dibenzyline 10 mg

red, capsule, imprinted with SKF E33

Image of Dibenzyline 10 mg
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What is the most important information I should know about phenoxybenzamine?

Multum donot

You should not use this medication if you are allergic to phenoxybenzamine.

Before taking phenoxybenzamine, tell your doctor if you have coronary artery disease, a lung infection, or kidney disease.

Avoid getting up too fast from a sitting or lying position, or you may feel dizzy. Get up slowly and steady yourself to prevent a fall.

Multum noalcohol

Avoid drinking alcohol. It can increase drowsiness caused by phenoxybenzamine.

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This medication can cause side effects that may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be awake and alert.

What is phenoxybenzamine?

Phenoxybenzamine lowers blood pressure.

Phenoxybenzamine is used control blood pressure and reduce sweating in people with pheochromocytoma.

Phenoxybenzamine may also be used for other purposes not listed in this medication guide.

What should I discuss with my healthcare provider before taking phenoxybenzamine?

Multum donot

You should not use this medication if you are allergic to phenoxybenzamine.

If you have any of these other conditions, you may need a dose adjustment or special tests to safely use this medication:

  • coronary artery disease (hardened arteries);
  • a lung infection; or
  • kidney disease.
Multum nopreg

FDA pregnancy category C. It is not known whether phenoxybenzamine is harmful to an unborn baby. Before taking this medication, tell your doctor if you are pregnant or plan to become pregnant during treatment.

Multum nobrfeed

It is not known whether phenoxybenzamine passes into breast milk or if it could harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.

How should I take phenoxybenzamine?

Take this medication exactly as prescribed by your doctor. Do not take it in larger amounts or for longer than recommended. Follow the directions on your prescription label.

Your doctor may occasionally change your dose to make sure you get the best results from this medication.

Multum water

Take this medicine with a full glass of water.

Multum rt

Store phenoxybenzamine at room temperature away from moisture and heat.

What happens if I miss a dose?

Take the missed dose as soon as you remember. If it is almost time for your next dose, wait until then to take the medicine and skip the missed dose. Do not take extra medicine to make up the missed dose.

What happens if I overdose?

Multum emt

Seek emergency medical attention if you think you have used too much of this medicine.

Overdose symptoms may include fast heart rate, vomiting, dizziness, or fainting.

What should I avoid while taking phenoxybenzamine?

Multum dizzy

This medication can cause side effects that may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be awake and alert.

Avoid getting up too fast from a sitting or lying position, or you may feel dizzy. Get up slowly and steady yourself to prevent a fall.

Multum noalcohol

Avoid drinking alcohol. It can increase drowsiness caused by phenoxybenzamine.

What are the possible side effects of phenoxybenzamine?

Multum emt

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Multum donot

Stop using phenoxybenzamine and call your doctor at once if you severe dizziness or if you feel like you might pass out.

Less serious side effects may include:

  • stuffy nose;
  • mild dizziness or drowsiness;
  • blurred vision;
  • trouble having an orgasm;
  • upset stomach; or
  • tired feeling.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What other drugs will affect phenoxybenzamine?

Tell your doctor about all other medications you use, especially:

  • reserpine;
  • tizanidine (Zanaflex);
  • epinephrine (Epi-Pen), norepinephrine; or
  • blood pressure medications.

This list is not complete and there may be other drugs that can interact with phenoxybenzamine. Tell your doctor about all your prescription and over-the-counter medications, vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start a new medication without telling your doctor.

Where can I get more information?

Your pharmacist can provide more information about phenoxybenzamine.


Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

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