What does phentolamine mean?
Phentolamine is a prescription medicine belonging to the non-selective alpha-adrenergic antagonists, commonly called alpha blockers. By competing with catecholamines at alpha receptors, it relaxes vascular smooth muscle and reverses some of their constricting effects. This action has made it useful in the management of severe hypertensive episodes and in older diagnostic testing for pheochromocytoma, a tumour that can flood the body with catecholamines. Phentolamine also has a different clinical role: an injection into the erectile tissue of the penis can help men with erectile dysfunction achieve an erection. Its name reflects its chemical construction from phenyl and toluidine groups and its relationship to amines. In ordinary language, phentolamine is almost entirely a specialised medical and pharmacological term rather than a general expression. Its importance lies in its powerful effects on sympathetic nervous system pathways, which make it both diagnostically and therapeutically valuable while requiring careful clinical supervision.
nounPhentolamine is a non-selective alpha-adrenergic receptor antagonist, or alpha blocker, that counteracts some effects of catecholamines and promotes vasodilation. It is used in medicine for severe hypertension and in certain diagnostic procedures, and it can also be injected into erectile tissue to treat erectile dysfunction.
- A non-selective alpha-adrenergic receptor antagonist used as a vasodilator in severe hypertension, as a diagnostic agent for some catecholamine-secreting tumours, and as an intracavernosal treatment for erectile dysfunction.
"The clinician administered intravenous phentolamine when the patient's blood pressure remained dangerously elevated."
"During a historical diagnostic test for pheochromocytoma, phentolamine was used to provoke and identify an abnormal catecholamine response."
"A clinician may inject phentolamine into the erectile tissue of the penis when oral treatments for erectile dysfunction are unsuitable."
The plural is uncommon; the name is normally used as a mass noun when referring to the medicine or its formulations.
"The pharmacist ordered two phentolamines for the emergency trolley."
With a name like a chemistry exam, phentolamine has a dramatic dual role: relieving severe hypertension and helping reveal catecholamine-secreting tumours.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of phentolamine
Phentolamine was coined as a chemical name in the modern pharmaceutical naming system, combining elements associated with phenyl and toluidine. Its final element, -amine, reflects the compound's amino functionality. The underlying names phenyl, toluidine, and amine belong to the established vocabulary of organic chemistry.
How phentolamine is actually used
This is specialised medical and pharmacological terminology. In clinical writing it is generally treated as a mass noun, although a plural can refer to multiple doses, formulations, or experimental preparations.
Easily confused with phentolamine
Phenyltoloxamine is an antihistamine used mainly for allergic and cold symptoms, whereas phentolamine is an alpha-adrenergic antagonist used primarily for its effects on blood vessels.