1. A medication that blocks alpha-adrenergic receptors, used to treat high blood pressure caused by excess adrenaline or in the diagnosis and management of pheochromocytoma.
Usage: medical/pharmaceutical term; also called phentolamine mesylate in its salt form

Examples

• The doctor prescribed phentolamine to manage the patient's dangerously elevated blood pressure.
• Phentolamine is often used as a diagnostic agent to confirm pheochromocytoma in patients with hypertension.
• The medication works by blocking the effects of norepinephrine on blood vessels.
• Phentolamine can be administered intravenously for rapid blood pressure control in emergency situations.