{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Phentolamine",
    "query": {
      "intervention": "Phentolamine"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 27,
    "total_pages": 3,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Phentolamine&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-07T11:55:45.304Z",
  "attribution": "Data derived from public ClinicalTrials.gov records. The official record at https://clinicaltrials.gov/ remains the source of truth for current availability, contacts, and full study details.",
  "notes": [
    "This endpoint exposes only public summary fields — no participant contact emails, phone numbers, or scraped investigator contact details.",
    "For contact information and full protocol detail, follow each trial's `official_url` to the ClinicalTrials.gov record.",
    "This API is a navigational aid. It does not provide medical advice, eligibility determinations, or compensation guarantees."
  ],
  "trials": [
    {
      "nct_id": "NCT04638660",
      "title": "Safety and Efficacy of Nyxol (0.75% Phentolamine Ophthalmic Solution) in Subjects With Dim Light Vision Disturbances",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Dim Light Vision Disturbances"
      ],
      "interventions": [
        {
          "name": "Phentolamine Ophthalmic Solution 0.75%",
          "type": "DRUG"
        },
        {
          "name": "Phentolamine Ophthalmic Solution Vehicle (Placebo)",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Ocuphire Pharma, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 144,
      "start_date": "2020-12-30",
      "completion_date": "2022-05-19",
      "has_results": true,
      "last_update_posted_date": "2025-10-14",
      "last_synced_at": "2026-09-07T11:55:45.304Z",
      "location_count": 17,
      "location_summary": "Newport Beach, California • Petaluma, California • Jacksonville, Florida + 12 more",
      "locations": [
        {
          "city": "Newport Beach",
          "state": "California"
        },
        {
          "city": "Petaluma",
          "state": "California"
        },
        {
          "city": "Jacksonville",
          "state": "Florida"
        },
        {
          "city": "Jacksonville",
          "state": "Florida"
        },
        {
          "city": "Pittsburg",
          "state": "Kansas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04638660"
    },
    {
      "nct_id": "NCT06787066",
      "title": "Sympathetic Vascular Transduction Across the Menopause Transition: Contributing Mechanisms",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "EARLY_PHASE1"
      ],
      "conditions": [
        "Menopause"
      ],
      "interventions": [
        {
          "name": "Propranolol Hydrochloride",
          "type": "DRUG"
        },
        {
          "name": "Phentolamine Injection",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of Missouri-Columbia",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "70 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 70 Years · Female only"
      },
      "enrollment_count": 75,
      "start_date": "2025-07-10",
      "completion_date": "2026-12",
      "has_results": false,
      "last_update_posted_date": "2025-09-15",
      "last_synced_at": "2026-09-07T11:55:45.304Z",
      "location_count": 1,
      "location_summary": "Columbia, Missouri",
      "locations": [
        {
          "city": "Columbia",
          "state": "Missouri"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06787066"
    },
    {
      "nct_id": "NCT01703559",
      "title": "The Safety and Efficacy of Phentolamine Mesylate Ophthalmic Solution in Subjects With Severe Night Vision Disturbances",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Night Vision Complaints",
        "Decrease in Night Vision",
        "Disturbance; Vision, Loss"
      ],
      "interventions": [
        {
          "name": "Phentolamine Mesylate Ophthalmic Solution 1.0%",
          "type": "DRUG"
        },
        {
          "name": "Phentolamine Mesylate Ophthalmic Solution 0.5%",
          "type": "DRUG"
        },
        {
          "name": "Phentolamine Mesylate Ophthalmic Solution Vehicle (Placebo)",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "Ocuphire Pharma, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "45 Years",
        "sex": "ALL",
        "summary": "18 Years to 45 Years"
      },
      "enrollment_count": 60,
      "start_date": "2011-09-09",
      "completion_date": "2012-04-30",
      "has_results": false,
      "last_update_posted_date": "2019-08-01",
      "last_synced_at": "2026-09-07T11:55:45.304Z",
      "location_count": 1,
      "location_summary": "Phoenix, Arizona",
      "locations": [
        {
          "city": "Phoenix",
          "state": "Arizona"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01703559"
    },
    {
      "nct_id": "NCT00080808",
      "title": "Nerve-Sparing Radical Prostatectomy With or Without Nerve Grafting Followed by Standard Therapy for Erectile Dysfunction in Treating Patients With Localized Prostate Cancer",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Prostate Cancer"
      ],
      "interventions": [
        {
          "name": "Alprostadil (E1)",
          "type": "DRUG"
        },
        {
          "name": "Papaverine",
          "type": "DRUG"
        },
        {
          "name": "Phentolamine mesylate",
          "type": "DRUG"
        },
        {
          "name": "Sildenafil citrate",
          "type": "DRUG"
        },
        {
          "name": "conventional surgery",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "DRUG",
        "PROCEDURE"
      ],
      "sponsor": "M.D. Anderson Cancer Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": "65 Years",
        "sex": "MALE",
        "summary": "Up to 65 Years · Male only"
      },
      "enrollment_count": 111,
      "start_date": "2001-08",
      "completion_date": "2009-07",
      "has_results": false,
      "last_update_posted_date": "2012-07-30",
      "last_synced_at": "2026-09-07T11:55:45.304Z",
      "location_count": 1,
      "location_summary": "Houston, Texas",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00080808"
    },
    {
      "nct_id": "NCT00104104",
      "title": "A Multiple Myeloma Trial in Patients With Bone Metastases",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Multiple Myeloma"
      ],
      "interventions": [
        {
          "name": "zoledronic acid",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Novartis Pharmaceuticals",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 179,
      "start_date": "2004-10",
      "completion_date": "2007-10",
      "has_results": true,
      "last_update_posted_date": "2011-06-29",
      "last_synced_at": "2026-09-07T11:55:45.304Z",
      "location_count": 68,
      "location_summary": "Huntsville, Alabama • Glendale, Arizona • Tucson, Arizona + 61 more",
      "locations": [
        {
          "city": "Huntsville",
          "state": "Alabama"
        },
        {
          "city": "Glendale",
          "state": "Arizona"
        },
        {
          "city": "Tucson",
          "state": "Arizona"
        },
        {
          "city": "Little Rock",
          "state": "Arkansas"
        },
        {
          "city": "Little Rock",
          "state": "Arkansas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00104104"
    },
    {
      "nct_id": "NCT06349759",
      "title": "Safety and Efficacy of 0.75% Phentolamine Ophthalmic Solution in Subjects With Post-refractive Surgery Visual Disturbances",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Mesopic Vision",
        "Night Vision Loss"
      ],
      "interventions": [
        {
          "name": "phentolamine ophthalmic solution 0.75%, a non-selective alpha-1 and alpha-2 adrenergic antagonist",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Ocuphire Pharma, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 200,
      "start_date": "2024-04-01",
      "completion_date": "2026-02-19",
      "has_results": true,
      "last_update_posted_date": "2026-08-18",
      "last_synced_at": "2026-09-07T11:55:45.304Z",
      "location_count": 25,
      "location_summary": "Pheonix, Arizona • Scottsdale, Arizona • Bakersfield, California + 20 more",
      "locations": [
        {
          "city": "Pheonix",
          "state": "Arizona"
        },
        {
          "city": "Scottsdale",
          "state": "Arizona"
        },
        {
          "city": "Bakersfield",
          "state": "California"
        },
        {
          "city": "Glendale",
          "state": "California"
        },
        {
          "city": "La Jolla",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06349759"
    },
    {
      "nct_id": "NCT04024891",
      "title": "Safety and Efficacy of Ophthalmic Phentolamine Mesylate to Reverse Pharmacologically Induced Mydriasis",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Mydriasis",
        "Dilation"
      ],
      "interventions": [
        {
          "name": "Phentolamine Mesylate Ophthalmic Solution 1%",
          "type": "DRUG"
        },
        {
          "name": "Phentolamine Mesylate Ophthalmic Solution Vehicle (Placebo)",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "Ocuphire Pharma, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "45 Years",
        "sex": "ALL",
        "summary": "18 Years to 45 Years"
      },
      "enrollment_count": 32,
      "start_date": "2019-08-13",
      "completion_date": "2019-09-17",
      "has_results": true,
      "last_update_posted_date": "2023-08-29",
      "last_synced_at": "2026-09-07T11:55:45.304Z",
      "location_count": 4,
      "location_summary": "Pittsburg, Kansas • Lexington, Kentucky • Athens, Ohio + 1 more",
      "locations": [
        {
          "city": "Pittsburg",
          "state": "Kansas"
        },
        {
          "city": "Lexington",
          "state": "Kentucky"
        },
        {
          "city": "Athens",
          "state": "Ohio"
        },
        {
          "city": "Warwick",
          "state": "Rhode Island"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04024891"
    },
    {
      "nct_id": "NCT05134974",
      "title": "Safety and Efficacy of Nyxol (0.75% Phentolamine Ophthalmic Solution) to Reverse Pharmacologically-Induced Mydriasis (MIRA-3)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Mydriasis",
        "Dilation"
      ],
      "interventions": [
        {
          "name": "Phentolamine Ophthalmic Solution 0.75%",
          "type": "DRUG"
        },
        {
          "name": "Phentolamine Ophthalmic Solution Vehicle",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Ocuphire Pharma, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "12 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "12 Years and older"
      },
      "enrollment_count": 368,
      "start_date": "2021-11-18",
      "completion_date": "2022-03-29",
      "has_results": true,
      "last_update_posted_date": "2023-08-29",
      "last_synced_at": "2026-09-07T11:55:45.304Z",
      "location_count": 15,
      "location_summary": "Newport Beach, California • Westminster, California • Delray Beach, Florida + 12 more",
      "locations": [
        {
          "city": "Newport Beach",
          "state": "California"
        },
        {
          "city": "Westminster",
          "state": "California"
        },
        {
          "city": "Delray Beach",
          "state": "Florida"
        },
        {
          "city": "Longwood",
          "state": "Florida"
        },
        {
          "city": "Morrow",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05134974"
    },
    {
      "nct_id": "NCT02966665",
      "title": ": Vascular Function in Health and Disease",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Chronic Obstructive Pulmonary Disease",
        "Pulmonary Artery Hypertension",
        "Heart Failure",
        "Hypertension"
      ],
      "interventions": [
        {
          "name": "Maximum Exercise Tests",
          "type": "OTHER"
        },
        {
          "name": "BH4, L-NMMA, Vitamin C, Vitamin E, α-Lipoic Acid and L-Ascorbate",
          "type": "DRUG"
        },
        {
          "name": "BQ-123",
          "type": "DRUG"
        },
        {
          "name": "Fexofenadine, Ranitidine",
          "type": "DRUG"
        },
        {
          "name": "Angiotensin-II, Valsartan",
          "type": "OTHER"
        },
        {
          "name": "Acetylcholine, Sodium Nitroprusside, Angiotensin-II, Norepinephrine, Phentolamine",
          "type": "DRUG"
        },
        {
          "name": "BQ-123, MitoQ, BH4",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "OTHER",
        "DRUG"
      ],
      "sponsor": "Russell Richardson",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 420,
      "start_date": "2008-09",
      "completion_date": "2026-08",
      "has_results": false,
      "last_update_posted_date": "2025-09-26",
      "last_synced_at": "2026-09-07T11:55:45.304Z",
      "location_count": 1,
      "location_summary": "Salt Lake City, Utah",
      "locations": [
        {
          "city": "Salt Lake City",
          "state": "Utah"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02966665"
    },
    {
      "nct_id": "NCT07140783",
      "title": "OPI-NXYDLD-303 Safety and Efficacy of Phentolamine Ophthalmic Solution in Keratorefractive Surgery Participants With Decreased Mesopic Visual Acuity",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Vision Loss Night",
        "Vision Disorders"
      ],
      "interventions": [
        {
          "name": "0.75% Phentolamine Ophthalmic Solution",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Ocuphire Pharma, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 200,
      "start_date": "2025-09-02",
      "completion_date": "2026-06",
      "has_results": false,
      "last_update_posted_date": "2026-06-22",
      "last_synced_at": "2026-09-07T11:55:45.304Z",
      "location_count": 23,
      "location_summary": "Chandler, Arizona • Mesa, Arizona • Phoenix, Arizona + 18 more",
      "locations": [
        {
          "city": "Chandler",
          "state": "Arizona"
        },
        {
          "city": "Mesa",
          "state": "Arizona"
        },
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Scottsdale",
          "state": "Arizona"
        },
        {
          "city": "Glendale",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07140783"
    }
  ]
}