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phenoxybenzamine (Dibenzyline)

Brand Names: Dibenzyline

Generic Name: phenoxybenzamine

What is phenoxybenzamine (Dibenzyline)?

Phenoxybenzamine is used to control blood pressure and reduce sweating in people with pheochromocytoma (tumor of the adrenal gland).

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

What are the possible side effects of phenoxybenzamine (Dibenzyline)?

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

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

Common 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 is the most important information I should know about phenoxybenzamine (Dibenzyline)?

Follow all directions on your medicine label and package. Tell each of your healthcare providers about all your medical conditions, allergies, and all medicines you use.

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

You should not use phenoxybenzamine if you are allergic to it.

Tell your doctor if you have ever had:

Tell your doctor if you are pregnant.

You should not breastfeed while using phenoxybenzamine.

How should I take phenoxybenzamine (Dibenzyline)?

Follow all directions on your prescription label and read all medication guides or instruction sheets. Your doctor may occasionally change your dose. Use the medicine exactly as directed.

Call your doctor if you have fast heartbeats. You may need to be treated with an additional medication.

Store phenoxybenzamine at room temperature away from moisture and heat.

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What happens if I miss a dose (Dibenzyline)?

Take the medicine as soon as you can, but skip the missed dose if it is almost time for your next dose. Do not take two doses at one time.

What happens if I overdose (Dibenzyline)?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

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

What should I avoid while taking phenoxybenzamine (Dibenzyline)?

Avoid driving or hazardous activity until you know how this medicine will affect you. Your reactions could be impaired.

Avoid getting up too fast from a sitting or lying position, or you may feel dizzy.

Drinking alcohol with this medicine can cause side effects.

What other drugs will affect phenoxybenzamine (Dibenzyline)?

Tell your doctor about all your other medicines, especially:

This list is not complete. Other drugs may affect phenoxybenzamine, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.

Where can I get more information (Dibenzyline)?

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.
Every effort has been made to ensure that the information provided by Cerner Multum, Inc. ('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Multum's drug information does not endorse drugs, diagnose patients or recommend therapy. Multum's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Multum does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.

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Reviewed on 2/6/2020

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