PHENOXYBENZAMINE

COMMON BRAND NAME(S): Dibenzyline

GENERIC NAME(S): PHENOXYBENZAMINE HCL

 

Description: Phenoxybenzamine is an alpha blocker.  It works by relaxing the blood vessels, causing the blood pressure to decrease.

Onset: Gradual over several hr (oral).

Duration: 3-4 days (oral/IV).

Pharmacokinetics:

Absorption: Incompletely and variably absorbed from the GI tract (oral).

Metabolism: Hepatic.

Excretion: Via urine and bile. Plasma half-life: 24 hr (IV).

This medication is used to treat high blood pressure and heavy sweating due to a certain tumor of the adrenal glands (pheochromocytoma).

 

OTHER USES:

This drug may also be used with other medications to treat certain blood circulation problems (e.g., Raynaud’s syndrome).

 

It is also used to treat certain conditions which involve difficulty urinating (e.g., neurogenic bladder, partial prostatic obstruction).

 

How to use phenoxybenzamine:

Take 10 mg of this medication by mouth with or without food, usually 2 to 3 times daily or as directed by your doctor.

 

Dosage is based on your medical condition and response to therapy.

 

Use this medication regularly in order to get the most benefit from it. To help you remember, take it at the same times each day. It is important to continue taking this medication even if you feel well. Most people with high blood pressure do not feel sick.

 

Do not suddenly stop taking this medication without consulting your doctor. Your condition may become worse when the drug is suddenly stopped. Your dose may need to be gradually decreased.

 

Inform your doctor if your condition worsens (e.g., your routine blood pressure readings increase).

Pregnancy Risk: Category C (Risk cannot be ruled out)

Some phenoxybenzamine side effects may not need any medical attention:

More common

  • Dizziness or lightheadedness, especially when getting up from a lying or sitting position
  • fast heartbeat
  • pinpoint pupils
  • stuffy nose

Less common

  • Confusion
  • drowsiness
  • dryness of mouth
  • headache
  • lack of energy
  • sexual problems in males
  • unusual tiredness or weakness

 

To lower your risk of dizziness and lightheadedness, get up slowly when rising from a sitting or lying position.

 

Tell your doctor immediately if any of these unlikely but serious side effects occur: fast heartbeat, fainting, sexual problems in males (e.g., trouble ejaculating), weakness.

 

For males, in the very unlikely event that you have a painful or prolonged erection lasting 4 or more hours, stop using this drug and seek immediate medical attention, or permanent problems could occur.

 

A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any of the following symptoms of a serious allergic reaction: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.

 

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

Precautions:

 

Before taking phenoxybenzamine, tell your doctor or pharmacist if you are allergic to it; or to other alpha blockers (e.g., phentolamine); or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

 

Before using this medication, tell your doctor or pharmacist your medical history, especially of: blood vessel disease (e.g., cerebral arteriosclerosis, coronary artery disease), heart disease (e.g., congestive heart failure), kidney disease, lung infections, certain eye problems (cataracts, glaucoma).

 

This drug may make you dizzy or drowsy. Do not drive, use machinery, or do any activity that requires alertness until you are sure you can perform such activities safely. Limit alcoholic beverages.

 

Before having surgery (including cataract/glaucoma eye surgery), tell your doctor or dentist if you are taking or have ever taken this medication, and about all the other products you use (including prescription drugs, nonprescription drugs, and herbal products).

 

Caution is advised when using this drug in the elderly because they may be more sensitive to its effects, especially dizziness.

 

During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor.

 

It is unknown if this drug passes into breast milk. Consult your doctor before breast-feeding.

 

Interactions:

 

Your doctor or pharmacist may already be aware of any possible drug interactions and may be monitoring you for them. Do not start, stop, or change the dosage of any medicine before checking with them first.

 

Before using this medication, tell your doctor or pharmacist of all prescription and nonprescription/herbal products you may use, especially of: drugs to treat erectile dysfunction-ED or pulmonary hypertension (e.g., sildenafil, tadalafil), epinephrine, other alpha blockers (e.g., prazosin), other drugs for high blood pressure (e.g., diuretics, ACE inhibitors, beta blockers).

 

Tell your doctor or pharmacist if you also take drugs that cause drowsiness such as: certain antihistamines (e.g., diphenhydramine), anti-seizure drugs (e.g., carbamazepine), medicine for sleep or anxiety (e.g., alprazolam, diazepam, zolpidem), muscle relaxants, narcotic pain relievers (e.g., codeine), psychiatric medicines (e.g., chlorpromazine, risperidone, amitriptyline, trazodone).

 

Check the labels on all your medicines (e.g., cough-and-cold products, diet aids, nonsteroidal anti-inflammatory drugs-NSAIDs such as ibuprofen for pain/fever reduction) because they may contain ingredients that could increase your blood pressure or contain drowsiness-causing ingredients. Ask your pharmacist about using those products safely.

 

This document does not contain all possible interactions. Therefore, before using this product, tell your doctor or pharmacist of all the products you use. Keep a list of all your medications with you, and share the list with your doctor and pharmacist.

Overdose:

 

If overdose is suspected, contact a poison control center or emergency room immediately.

 

Notes

Do not share this medication with others.

 

Have your blood pressure checked regularly while taking this medication. Learn how to monitor your own blood pressure at home, and share the results with your doctor.

 

Missed Dose

If you miss a dose, take it as soon as you remember. If it is near the time of the next dose, skip the missed dose and resume your usual dosing schedule. Do not double the dose to catch up.

 

Storage

Store at room temperature between 59-86 degrees F (15-30 degrees C) away from light and moisture. Do not store in the bathroom. Keep all medicines away from children and pets.

 

Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard this product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company for more details about how to safely discard your product.

 

Brands:

 

Available Brands:

Dibenzyline

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