{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Viagra+%28sildenafil+citrate%29&page=3",
    "query": {
      "intervention": "Viagra (sildenafil citrate)",
      "page": 3
    },
    "page_size": 10
  },
  "pagination": {
    "page": 3,
    "page_size": 10,
    "total_count": 177,
    "total_pages": 18,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Viagra+%28sildenafil+citrate%29&page=4&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Viagra+%28sildenafil+citrate%29&page=2&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-10T19:57:41.613Z",
  "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": "NCT01948518",
      "title": "Effect of Sildenafil on Diffusion Capacity in Patients With PH and Parenchymal Lung Disease",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Diffuse Parenchymal Lung Disease",
        "Pulmonary Hypertension"
      ],
      "interventions": [
        {
          "name": "Oral sildenafil 20 mg",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "The Cleveland Clinic",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 15,
      "start_date": "2009-06",
      "completion_date": "2012-06",
      "has_results": true,
      "last_update_posted_date": "2014-09-30",
      "last_synced_at": "2026-10-10T19:57:41.613Z",
      "location_count": 1,
      "location_summary": "Cleveland, Ohio",
      "locations": [
        {
          "city": "Cleveland",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01948518"
    },
    {
      "nct_id": "NCT02129725",
      "title": "Effect of Prolonged PDE-5 Inhibition on Insulin Signaling in Skeletal Muscle.",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Metabolic Syndrome"
      ],
      "interventions": [
        {
          "name": "Sildenafil citrate",
          "type": "DRUG"
        },
        {
          "name": "Placebo Oral Capsule",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Vanderbilt University Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 15,
      "start_date": "2014-04",
      "completion_date": "2016-12",
      "has_results": true,
      "last_update_posted_date": "2017-04-19",
      "last_synced_at": "2026-10-10T19:57:41.613Z",
      "location_count": 1,
      "location_summary": "Nashville, Tennessee",
      "locations": [
        {
          "city": "Nashville",
          "state": "Tennessee"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02129725"
    },
    {
      "nct_id": "NCT01670136",
      "title": "Pharmacokinetics of Sildenafil in Premature Infants",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Persistent Pulmonary Hypertension of the Newborn"
      ],
      "interventions": [
        {
          "name": "1 dose of sildenafil",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of North Carolina, Chapel Hill",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": "364 Days",
        "sex": "ALL",
        "summary": "Up to 364 Days"
      },
      "enrollment_count": 34,
      "start_date": "2013-02",
      "completion_date": "2016-07",
      "has_results": false,
      "last_update_posted_date": "2016-11-02",
      "last_synced_at": "2026-10-10T19:57:41.613Z",
      "location_count": 9,
      "location_summary": "Birmingham, Alabama • Indianapolis, Indiana • Louisville, Kentucky + 6 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Indianapolis",
          "state": "Indiana"
        },
        {
          "city": "Louisville",
          "state": "Kentucky"
        },
        {
          "city": "Albany",
          "state": "New York"
        },
        {
          "city": "Brooklyn",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01670136"
    },
    {
      "nct_id": "NCT00343200",
      "title": "A Study Of The Safety and Efficacy Of Viagra In Men With Erectile Dysfunction Who Do Not Self Identify.",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Impotence"
      ],
      "interventions": [
        {
          "name": "Placebo",
          "type": "DRUG"
        },
        {
          "name": "Viagra (sildenafil citrate)",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Pfizer's Upjohn has merged with Mylan to form Viatris Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "30 Years",
        "maximum_age": null,
        "sex": "MALE",
        "summary": "30 Years and older · Male only"
      },
      "enrollment_count": 371,
      "start_date": "2006-07",
      "completion_date": "2007-09",
      "has_results": false,
      "last_update_posted_date": "2021-02-01",
      "last_synced_at": "2026-10-10T19:57:41.613Z",
      "location_count": 48,
      "location_summary": "Huntsville, Alabama • Mesa, Arizona • Phoenix, Arizona + 42 more",
      "locations": [
        {
          "city": "Huntsville",
          "state": "Alabama"
        },
        {
          "city": "Mesa",
          "state": "Arizona"
        },
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Anaheim",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00343200"
    },
    {
      "nct_id": "NCT03598140",
      "title": "Sildenafil Treatment for Mild TBI",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Vascular System Injuries",
        "Concussion, Brain",
        "Post-Concussion Syndrome"
      ],
      "interventions": [
        {
          "name": "Sildenafil Citrate",
          "type": "DRUG"
        },
        {
          "name": "Placebo oral capsule",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of Texas Southwestern Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "35 Years",
        "sex": "MALE",
        "summary": "18 Years to 35 Years · Male only"
      },
      "enrollment_count": 22,
      "start_date": "2018-07-25",
      "completion_date": "2019-05-29",
      "has_results": true,
      "last_update_posted_date": "2020-11-19",
      "last_synced_at": "2026-10-10T19:57:41.613Z",
      "location_count": 1,
      "location_summary": "Dallas, Texas",
      "locations": [
        {
          "city": "Dallas",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03598140"
    },
    {
      "nct_id": "NCT04770155",
      "title": "Vascular Dysfunction in Black Individuals: Roles of Nitric Oxide and Endothelin-1",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "EARLY_PHASE1"
      ],
      "conditions": [
        "Vascular Function",
        "Racial Disparity"
      ],
      "interventions": [
        {
          "name": "Dietary Nitrates 400 mg",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "L-citrulline 3 g",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Sildenafil 100 mg",
          "type": "DRUG"
        },
        {
          "name": "Bosentan 125 mg",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "DRUG"
      ],
      "sponsor": "University of Mississippi Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "40 Years",
        "sex": "ALL",
        "summary": "18 Years to 40 Years"
      },
      "enrollment_count": 8,
      "start_date": "2021-05-27",
      "completion_date": "2021-09-20",
      "has_results": true,
      "last_update_posted_date": "2023-10-31",
      "last_synced_at": "2026-10-10T19:57:41.613Z",
      "location_count": 1,
      "location_summary": "Jackson, Mississippi",
      "locations": [
        {
          "city": "Jackson",
          "state": "Mississippi"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04770155"
    },
    {
      "nct_id": "NCT00056433",
      "title": "Evaluation of Hydroxyurea Plus L-arginine or Sildenafil to Treat Sickle Cell Anemia",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Sickle Cell Anemia"
      ],
      "interventions": [
        {
          "name": "Hydroxyurea",
          "type": "DRUG"
        },
        {
          "name": "L-Arginine",
          "type": "DRUG"
        },
        {
          "name": "Sildenafil",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "National Institutes of Health Clinical Center (CC)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "16 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "16 Years and older"
      },
      "enrollment_count": 39,
      "start_date": "2003-03-10",
      "completion_date": "2006-12-27",
      "has_results": false,
      "last_update_posted_date": "2019-11-22",
      "last_synced_at": "2026-10-10T19:57:41.613Z",
      "location_count": 1,
      "location_summary": "Bethesda, Maryland",
      "locations": [
        {
          "city": "Bethesda",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00056433"
    },
    {
      "nct_id": "NCT00352482",
      "title": "Sildenafil to Increase Exercise Capacity in Individuals With Idiopathic Pulmonary Fibrosis and Pulmonary Hypertension",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Pulmonary Fibrosis",
        "Hypertension, Pulmonary"
      ],
      "interventions": [
        {
          "name": "Sildenafil (50 mg)",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "National Heart, Lung, and Blood Institute (NHLBI)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "19 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "19 Years and older"
      },
      "enrollment_count": 20,
      "start_date": "2004-11",
      "completion_date": "2007-07",
      "has_results": false,
      "last_update_posted_date": "2016-07-29",
      "last_synced_at": "2026-10-10T19:57:41.613Z",
      "location_count": 1,
      "location_summary": "Los Angeles, California",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00352482"
    },
    {
      "nct_id": "NCT01954524",
      "title": "A Phase 1, Open-Label Study of Intravenous Sildenafil in Patients With Cirrhosis",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Cirrhosis"
      ],
      "interventions": [
        {
          "name": "IV bolus injection of Sildenafil",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of Maryland, Baltimore",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 2,
      "start_date": "2014-05",
      "completion_date": "2015-10",
      "has_results": false,
      "last_update_posted_date": "2022-11-15",
      "last_synced_at": "2026-10-10T19:57:41.613Z",
      "location_count": 1,
      "location_summary": "Baltimore, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01954524"
    },
    {
      "nct_id": "NCT01168908",
      "title": "Revatio for Heart Disease in Duchenne Muscular Dystrophy and Becker Muscular Dystrophy",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Duchenne Muscular Dystrophy",
        "Becker Muscular Dystrophy"
      ],
      "interventions": [
        {
          "name": "Sildenafil",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Hugo W. Moser Research Institute at Kennedy Krieger, Inc.",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "50 Years",
        "sex": "MALE",
        "summary": "18 Years to 50 Years · Male only"
      },
      "enrollment_count": 20,
      "start_date": "2010-09",
      "completion_date": "2014-01",
      "has_results": true,
      "last_update_posted_date": "2019-02-26",
      "last_synced_at": "2026-10-10T19:57:41.613Z",
      "location_count": 1,
      "location_summary": "Baltimore, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01168908"
    }
  ]
}