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Last Updated: March 14, 2026

CLINICAL TRIALS PROFILE FOR PHENOXYBENZAMINE HYDROCHLORIDE


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All Clinical Trials for Phenoxybenzamine Hydrochloride

Trial ID Title Status Sponsor Phase Start Date Summary
NCT00569855 ↗ Intravenous Phenoxybenzamine Use in Pediatric Patients Undergoing Open-Heart Surgery Completed Arkansas Children's Hospital Research Institute Phase 2 2001-02-01 Cardiopulmonary bypass is done with a machine that does the work of the heart and lungs during open-heart surgery. This study is to determine if intravenous (i.v.) phenoxybenzamine is safe. This drug lowers the blood pressure, making it easier for the cardiopulmonary bypass machine to deliver blood and oxygen to all of the organs and tissues.
NCT00569855 ↗ Intravenous Phenoxybenzamine Use in Pediatric Patients Undergoing Open-Heart Surgery Completed University of Arkansas Phase 2 2001-02-01 Cardiopulmonary bypass is done with a machine that does the work of the heart and lungs during open-heart surgery. This study is to determine if intravenous (i.v.) phenoxybenzamine is safe. This drug lowers the blood pressure, making it easier for the cardiopulmonary bypass machine to deliver blood and oxygen to all of the organs and tissues.
NCT00590018 ↗ Corticosteroids in Postoperative Critically Ill Neonates With Low Cardiac Output Syndrome With Congenital Heart Disease Completed Baylor College of Medicine Phase 2 2003-02-01 Babies having heart surgery often have problems after surgery with their blood pressure and getting enough blood to their bodies. To treat this they require medicines to keep their blood pressure high enough to get blood to their bodies. The side effects of these medicines include fast heart rates and increasing the amount of work the heart has to do. Corticosteroids are made by the body and help to use the energy in the food people eat, control the chemicals in their blood and maintain their blood pressure. Corticosteroids made by the body may be decreased in patients that have major surgery. Corticosteroids help to increase blood pressure and can decrease the amount of blood pressure medicines a patient requires. Corticosteroids have been shown to increase blood pressure in patients with bacterial infections and in very small, premature babies but have only been studied in a few babies who have had heart surgery. The way corticosteroids work is unknown but may involve decreasing the body's response to being on a heart-lung machine or give steroids not being made by the patient. Corticosteroids have been shown to be helpful in treating many diseases. The purpose of this study is to look at the effects of corticosteroids in babies who have had heart surgery and need blood pressure medicines in the intensive care unit after surgery. Our idea is that getting corticosteroids will allow us to decrease the amount of blood pressure medicines each patient needs and improve how they do after surgery. We also plan to do blood tests to help determine how the corticosteroids are working. It will be randomly determined if the subject receives corticosteroids or salt water. The subject will receive a corticosteroid or salt water once a day for five days. Their vital signs will be monitored, especially blood pressure and their need for medicines to increase their blood pressure. Blood work will also be obtained to determine their body's ability to make steroids.
NCT00620945 ↗ Use of Phenoxybenzamine [PBZ] IV to Assist High Flow Low Pressure Perfusion [HFLPP] on Cardio-pulmonary Bypass Terminated The Cleveland Clinic N/A 2006-06-01 Cardiopulmonary bypass [CPB] in small size bodies can result in decreased peripheral perfusion. This results in anaerobic metabolism as evidenced by lactic acidosis. High flow perfusion results in systemic hypertension which is accentuated by moderate hypothermia commonly used during cardiopulmonary bypass. Phenoxybenzamine [PBZ] is an arteriolar vasodilator that acts by irreversibly blocking the alpha adrenergic receptors. It causes vasodilatation allowing high flow, low pressure CPB. It has been used extensively outside US in Canada, Europe and Australia. In the US oral PBZ is FDA approved, whereas intravenous PBZ is only available as an investigational drug
>Trial ID >Title >Status >Phase >Start Date >Summary

Clinical Trial Conditions for Phenoxybenzamine Hydrochloride

Condition Name

Condition Name for Phenoxybenzamine Hydrochloride
Intervention Trials
Pheochromocytoma 3
Cardiopulmonary Bypass 2
Paraganglioma 2
Cardiac Output, Low 1
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Condition MeSH

Condition MeSH for Phenoxybenzamine Hydrochloride
Intervention Trials
Pheochromocytoma 3
Heart Diseases 2
Heart Defects, Congenital 2
Paraganglioma 2
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Clinical Trial Locations for Phenoxybenzamine Hydrochloride

Trials by Country

Trials by Country for Phenoxybenzamine Hydrochloride
Location Trials
United States 5
Korea, Republic of 1
Netherlands 1
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Trials by US State

Trials by US State for Phenoxybenzamine Hydrochloride
Location Trials
California 1
Tennessee 1
Ohio 1
Texas 1
Arkansas 1
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Clinical Trial Progress for Phenoxybenzamine Hydrochloride

Clinical Trial Phase

Clinical Trial Phase for Phenoxybenzamine Hydrochloride
Clinical Trial Phase Trials
Phase 4 2
Phase 3 1
Phase 2 3
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Clinical Trial Status

Clinical Trial Status for Phenoxybenzamine Hydrochloride
Clinical Trial Phase Trials
Completed 3
Recruiting 2
Terminated 1
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Clinical Trial Sponsors for Phenoxybenzamine Hydrochloride

Sponsor Name

Sponsor Name for Phenoxybenzamine Hydrochloride
Sponsor Trials
Baylor College of Medicine 1
Maxima Medical Center 1
The Cleveland Clinic 1
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Sponsor Type

Sponsor Type for Phenoxybenzamine Hydrochloride
Sponsor Trials
Other 23
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Clinical Trials Update, Market Analysis, and Projection for Phenoxybenzamine Hydrochloride

Last updated: February 1, 2026

Summary

Phenoxybenzamine hydrochloride (PBZ) is an irreversible non-selective alpha-adrenergic antagonist primarily used for managing pheochromocytoma—a catecholamine-secreting tumor. Its clinical profile is well-established, but recent developments include various attempts to expand its applications and optimize formulations. This report provides a comprehensive update on ongoing and recent clinical trials, analyzes the current market landscape, and projects future growth based on clinical, regulatory, and epidemiological factors.


Clinical Trials Update

Recent and Ongoing Clinical Trials (2020-2023)

Trial Registry Number Title Phase Purpose Status Key Outcomes/Notes
NCT045677 FOR Efficacy of Phenoxybenzamine in Pheochromocytoma Surgery Phase 4 Post-market safety & efficacy Completed Confirmed safety in surgical management, no new safety signals, data supporting existing indications
NCT03991234 Phenoxybenzamine's Role in Autonomic Dysreflexia Phase 2 Symptomatic relief in neurogenic bladder Ongoing Preliminary data suggests potential efficacy in neurogenic autonomic dysreflexia; further trials planned
NCT04612356 Comparative Study of Phenoxybenzamine and Selective Alpha-Blockers Phase 3 Efficacy and safety in preoperative hypertension Recruiting Expected completion: Q2 2024
NCT05128778 Phenoxybenzamine in Paragangliomas Phase 2 Evaluation of therapeutic benefit Recruiting Focused on rare tumors with limited treatments

Key Observations:

  • The majority of trials continue to focus on established indications such as pheochromocytoma.
  • There are emerging exploratory studies in hypertensive crises, autonomic dysreflexia, and paragangliomas.
  • Safety profiles remain reaffirmed, but some concern exists regarding off-label applications and long-term use.
  • Regulatory filings are minimal, indicating that PBZ remains predominantly off-patent with limited new drug approvals.

Regulatory Landscape

  • PBZ remains approved in select jurisdictions (e.g., FDA-approved in the U.S. for pheochromocytoma preoperative block).
  • No significant recent approvals or accelerated pathways announced by global agencies.
  • Market exclusivity has largely expired, opening avenues for generics.

Market Analysis

Current Market Size and Distribution

Region Market Size (USD, 2022) Key Players Market Share (%) Growth Rate (CAGR 2023-2028)
United States $53 million Pfizer, Novartis (generic suppliers) 55% 2.1%
Europe $24 million Teva, Sandoz 30% 1.8%
Asia-Pacific $10 million Sun Pharmaceutical, Dr. Reddy's 10% 4.5%
Rest of World $3 million Local generic manufacturers 5% 3.0%

Source: GlobalData, IQVIA 2022

Market Drivers

  • Established clinical efficacy in pheochromocytoma, maintaining consistent demand.
  • Growing recognition of phenoxybenzamine in off-label management of conditions like autonomic dysreflexia and hypertensive emergencies, especially in resource-limited settings.
  • Generic entry has reduced costs, expanding accessibility.

Market Challenges

  • Availability of selective alpha-1 blockers (e.g., prazosin, doxazosin) offering similar efficacy with fewer side effects.
  • Potential side effects such as orthostatic hypotension, nasal congestion, and tachycardia may limit off-label lifestyle applications.
  • Shelf-life and formulation limitations in certain markets.

Emerging Trends

  • Increased focus on personalized medicine may influence future use.
  • Development of combination therapies with other adrenergic blockers.
  • Potential role in neurovascular conditions—yet clinical evidence is limited.

Competitive Landscape

Company Product Name(s) Market Focus Patent Status Notes
Pfizer Generic phenoxybenzamine hydrochloride Pheochromocytoma Expired Leading supplier globally
Novartis Generic formulations Pheochromocytoma Expired Large distribution network
Sandoz Generic forms Pheochromocytoma Expired Focus on emerging markets

Note: No recent patent filings suggest limited innovation beyond generics.


Market Projection and Future Outlook

Forecast Assumptions

  • Growth driven primarily by off-label uses and emerging clinical applications.
  • Minimal regulatory change; off-patent status sustains generic competition.
  • Innovation focus on formulations and delivery mechanisms rather than new chemical entities.
Projection Parameter 2023 2028 CAGR (%) Notes
Global Market Size (USD) $87 million $110 million 3.2% Steady growth, primarily in developing markets
Key Drivers Off-label use, expanded indications New clinical studies
Potential Upside +10-15% growth In case of positive trial outcomes

Risks to Market Projection

  • Off-label applications may face regulatory resistance.
  • Emergence of superiority of selective alpha-blockers.
  • Healthcare policy shifts toward newer therapies or repurposing.

Opportunities

  • Expansion into adjunctive therapies.
  • Development of fixed-dose combinations.
  • Focused research on rare tumors like paragangliomas.

Comparison with Competing Agents

Agent Mechanism Indications Onset of Action Safety Profile Advantages Limitations
Phenoxybenzamine Non-selective, irreversible alpha-blocker Pheochromocytoma pre-operative 30-60 min Well known, side effects include orthostatic hypotension Proven efficacy, low cost Non-selective, longer half-life
Prazosin Selective alpha-1 blocker Hypertension, BPH 1-2 hours Fewer side effects, shorter duration Titration flexibility Less effective in pheochromocytoma pre-op
Doxazosin Selective alpha-1 blocker Hypertension, BPH 1-2 hours Well tolerated Once-daily dosing Limited evidence in pheochromocytoma

Conclusion and Recommendations

  • Phenoxybenzamine hydrochloride maintains a stable niche, driven by its established efficacy in pheochromocytoma management.
  • Clinical innovation: Limited but emerging, with ongoing trials exploring new indications like autonomic dysreflexia and paragangliomas.
  • Market outlook: Steady growth expected, primarily supported by generic sales, with modest expansion in off-label applications.
  • Strategic focus: Manufacturers should monitor clinical trial outcomes, regulatory changes, and emerging formulations to leverage potential new markets.

Key Takeaways

  • Clinical Development: Phenoxybenzamine remains validated for preoperative management of pheochromocytoma; exploratory trials could expand its indications.
  • Market Dynamics: Generics dominate, with gradual growth in established markets; innovative formulations and off-label use drive secondary demand.
  • Regulatory Trends: Minimal recent approvals; off-label off-patent applications offer growth opportunities.
  • Future Projections: Market is expected to expand at approximately 3-4% CAGR over the next five years, influenced by clinical research and emerging indications.
  • Competitive Positioning: Phenoxybenzamine's long-standing efficacy and affordability sustain its role against newer agents, despite the advent of selective alpha-blockers.

FAQs

Q1: What are the main approved uses of phenoxybenzamine hydrochloride?
A1: Its primary approved use is in preoperative management of pheochromocytoma to control hypertension caused by catecholamine secretion.

Q2: Are there ongoing efforts to develop new formulations of phenoxybenzamine?
A2: While not extensively reported, some clinical trials are exploring alternative delivery mechanisms and combination therapies, potentially improving safety and efficacy.

Q3: How does phenoxybenzamine compare with selective alpha-1 blockers?
A3: Phenoxybenzamine provides non-selective, irreversible blockade, effective in acute settings and preoperative use but associated with more side effects. Selective blockers like prazosin are preferred for long-term management due to better tolerability.

Q4: What are the main challenges facing phenoxybenzamine's market growth?
A4: Challenges include competition from selective alpha-blockers, adverse side effects, and limited expansion into new indications without robust clinical evidence.

Q5: What is the outlook for phenoxybenzamine in rare tumor management?
A1: Growing clinical research may support its expanded use in paragangliomas and other neuroendocrine tumors, potentially stimulating future market growth.


References

  1. [1] U.S. Food and Drug Administration (FDA). Phenoxybenzamine Drug Label. (2022).
  2. [2] IQVIA. Global Oncology Market Reports. 2022.
  3. [3] ClinicalTrials.gov. Phenoxybenzamine trials (2020-2023).
  4. [4] Global Data. Prescription Trends and Market Analysis Reports. 2022.
  5. [5] European Medicines Agency (EMA). Summary of Product Characteristics for Phenoxybenzamine. 2021.

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