Phentolamine

Phentolamine is a reversible, non-selective alpha-adrenergic antagonist. It is used to treat high blood pressure, Raynaud's phenomenon, and pheochromocytoma. It works by blocking the action of certain chemicals in the body that constrict blood vessels and cause an increase in blood pressure. It also helps to reduce the amount of urine produced. Side effects may include nausea, vomiting, dizziness, and headache.

Phentolamine, sold under brand names like Regitine and OraVerse, is a medication used for several purposes . It works by blocking the effects of certain hormones, including epinephrine and norepinephrine, which are involved in the "fight-or-flight" response.

Here's a summary of its main uses:

• Controlling hypertensive emergencies: Phentolamine is most commonly used to treat severe high blood pressure (hypertension), particularly those caused by a tumor of the adrenal gland (pheochromocytoma).
• Diagnosis of pheochromocytoma: This medication can help diagnose pheochromocytoma by observing blood pressure changes after phentolamine administration.
• Treatment of complications from local anesthetics: Phentolamine can help reverse the numbing effects of certain local anesthetics used in dentistry (OraVerse).
• Other uses: Phentolamine has various other uses, including treating high blood pressure caused by cocaine use and certain types of pain syndromes.