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Generic name: Phenoxybenzamine [fen-OX-ee-BENZ-a-meen]
Drug class: Miscellaneous cardiovascular agents

What is Dibenzyline?

Dibenzyline can be used to manage blood pressure and reduce sweating in patients suffering from pheochromocytoma (a tumor in the adrenal gland). Dibenzyline is also used for reasons not mentioned in this guideline.

Side effects of Dibenzyline

See a doctor immediately. If you are experiencing symptoms or warning signs of an allergic response, like hives, trouble breathing, or swelling of your lips, face, and tongue,

Stop taking Dibenzyline and consult your physician immediately if you notice excessive dizziness or are concerned that you could be able to pass out.

Common negative side effects of dibenzyline include:

  • Stuffy nose;
  • Slight dizziness, or dizziness;
  • Blurred vision
  • Trouble with orgasms
  • Upset stomach; or

This is not a comprehensive list of possible side effects, and other effects may also be present. Contact your doctor for advice regarding medical adverse effects. You can report any symptoms to the FDA at 1-800-FDA-1088.


Follow the directions on your prescription label and on the label of your package. Inform your healthcare professionals about your medical issues, allergies, and any medications you take.

Before you take this drug

Dibenzyline is not a good choice if you have an allergy to it.

Inform your doctor if you have ever suffered from:

  • Coronary arterial disorder (hardened arteries);
  • A lung infection; or
  • Kidney disease.

How to take Dibenzyline?

Follow the directions on your prescription label, and review all medication guides and instructions sheets. Your doctor may alter the dosage. Follow the medication exactly as prescribed. Consult your physician if you have heartbeats that are fast. You might need another medication. Keep dibenzyline in a cool, dry place, away from heat and humidity

What happens if I miss the dose?

You should take the medication as quickly as you can. However, avoid your missed dosage if it's nearing the time to take the next dose. Don't take two doses at a time

What happens if I overdose?

For medical emergencies, seek emergency medical attention or contact the Poison Help Line toll-free at 1-800-222-1222.

The symptoms of an overdose can include a high heartbeat, vomiting, dizziness, nausea, or fainting.

What should be avoided?

Avoid driving or engaging in hazardous activities until you are aware of how dibenzyline affects your body. The way you react could be impaired. Do not get up too quickly from a lying or seated position. You could get dizzy. Alcohol consumption with this medication may cause unwanted side effects.

Interaction with other drugs

Inform your doctor about any other medications you take, including:

  • Reserpine;
  • Tizanidine;
  • Epinephrine (epi-pen), norepinephrine,
  • Blood pressure medication.

This list isn't exhaustive. Other medications can affect Dibenzyline as well, such as prescription and over-the-counter medicines, vitamins, and herbal products. Some interactions with dibenzyline are not listed here. are listed here.