Tag: pheochromocytoma

November 22, 2025 / Mohammed looti

PHENTOLAMINE

Introduction to Phentolamine: A Non-Selective Alpha-Adrenergic Antagonist Phentolamine, known historically by the American brand name Regitine, is classified pharmacologically as a non-selective alpha-adrenoreceptor blocking agent. This designation indicates its mechanism of action involves competitive antagonism at both the alpha-1 ($alpha_1$) and alpha-2 ($alpha_2$) adrenergic receptor subtypes located throughout the body. Developed primarily for managing acute […]

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November 21, 2025 / Mohammed looti

PHEOCHROMOCYTOMA

Introduction and Definition of Pheochromocytoma Pheochromocytoma is a rare, usually benign neuroendocrine tumor originating from the chromaffin cells of the adrenal medulla, although approximately ten percent of cases manifest in extra-adrenal sympathetic ganglia, where they are specifically termed paragangliomas. This tumor type is defined by its ability to synthesize, store, and excrete excessive amounts of […]

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