{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Sildenafil+20+mg+tablets",
    "query": {
      "intervention": "Sildenafil 20 mg tablets"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 13,
    "total_pages": 2,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Sildenafil+20+mg+tablets&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-24T22:22:15.955Z",
  "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": "NCT01392469",
      "title": "Pharmacokinetic Effects of QTI571 on Sildenafil and Bosentan in Pulmonary Arterial Hypertension Participants",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Pulmonary Arterial Hypertension"
      ],
      "interventions": [
        {
          "name": "Imatinib",
          "type": "DRUG"
        },
        {
          "name": "Sildenafil",
          "type": "DRUG"
        },
        {
          "name": "Bosentan",
          "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": 21,
      "start_date": "2011-04-20",
      "completion_date": "2012-10-25",
      "has_results": true,
      "last_update_posted_date": "2021-06-21",
      "last_synced_at": "2026-09-24T22:22:15.955Z",
      "location_count": 3,
      "location_summary": "Tampa, Florida • Weston, Florida • Mineola, New York",
      "locations": [
        {
          "city": "Tampa",
          "state": "Florida"
        },
        {
          "city": "Weston",
          "state": "Florida"
        },
        {
          "city": "Mineola",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01392469"
    },
    {
      "nct_id": "NCT00617305",
      "title": "Study of Add-on Ambrisentan Therapy to Background Phosphodiesterase Type-5 Inhibitor (PDE5i) Therapy in Pulmonary Arterial Hypertension (ATHENA-1)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Pulmonary Arterial Hypertension"
      ],
      "interventions": [
        {
          "name": "Ambrisentan",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        },
        {
          "name": "Sildenafil",
          "type": "DRUG"
        },
        {
          "name": "Tadalafil",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Gilead Sciences",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "16 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "16 Years to 75 Years"
      },
      "enrollment_count": 38,
      "start_date": "2008-04",
      "completion_date": "2011-07",
      "has_results": true,
      "last_update_posted_date": "2012-07-30",
      "last_synced_at": "2026-09-24T22:22:15.955Z",
      "location_count": 30,
      "location_summary": "Mobile, Alabama • Phoenix, Arizona • Los Angeles, California + 25 more",
      "locations": [
        {
          "city": "Mobile",
          "state": "Alabama"
        },
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Torrance",
          "state": "California"
        },
        {
          "city": "Fort Lauderdale",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00617305"
    },
    {
      "nct_id": "NCT02335242",
      "title": "Sildenafil for the Treatment of Lymphatic Malformations",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Lymphatic Malformations",
        "Lymphatic Diseases"
      ],
      "interventions": [
        {
          "name": "Sildenafil 20 mg tablets",
          "type": "DRUG"
        },
        {
          "name": "Placebo tablets (resembling Revatio)",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "Stanford University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "6 Months",
        "maximum_age": "10 Years",
        "sex": "ALL",
        "summary": "6 Months to 10 Years"
      },
      "enrollment_count": 22,
      "start_date": "2015-05-23",
      "completion_date": "2021-03-30",
      "has_results": true,
      "last_update_posted_date": "2022-11-17",
      "last_synced_at": "2026-09-24T22:22:15.955Z",
      "location_count": 3,
      "location_summary": "Stanford, California • Aurora, Colorado • Chicago, Illinois",
      "locations": [
        {
          "city": "Stanford",
          "state": "California"
        },
        {
          "city": "Aurora",
          "state": "Colorado"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02335242"
    },
    {
      "nct_id": "NCT03199612",
      "title": "Sildenafil To Prevent Clot",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "EARLY_PHASE1"
      ],
      "conditions": [
        "Thrombosis",
        "Hemolysis"
      ],
      "interventions": [
        {
          "name": "Sildenafil",
          "type": "DRUG"
        },
        {
          "name": "Placebo Oral Tablet",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Montefiore 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": 20,
      "start_date": "2019-06-03",
      "completion_date": "2023-01-20",
      "has_results": true,
      "last_update_posted_date": "2024-07-10",
      "last_synced_at": "2026-09-24T22:22:15.955Z",
      "location_count": 1,
      "location_summary": "The Bronx, New York",
      "locations": [
        {
          "city": "The Bronx",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03199612"
    },
    {
      "nct_id": "NCT02891850",
      "title": "Riociguat rEplacing PDE-5i Therapy evaLuated Against Continued PDE-5i thErapy",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Pulmonary Arterial Hypertension"
      ],
      "interventions": [
        {
          "name": "Riociguat (Adempas, BAY63-2521)",
          "type": "DRUG"
        },
        {
          "name": "Sildenafil",
          "type": "DRUG"
        },
        {
          "name": "Tadalafil",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Bayer",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "18 Years to 75 Years"
      },
      "enrollment_count": 225,
      "start_date": "2017-01-11",
      "completion_date": "2020-03-03",
      "has_results": true,
      "last_update_posted_date": "2021-02-26",
      "last_synced_at": "2026-09-24T22:22:15.955Z",
      "location_count": 17,
      "location_summary": "Phoenix, Arizona • Tucson, Arizona • Sacramento, California + 14 more",
      "locations": [
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Tucson",
          "state": "Arizona"
        },
        {
          "city": "Sacramento",
          "state": "California"
        },
        {
          "city": "Orlando",
          "state": "Florida"
        },
        {
          "city": "Weston",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02891850"
    },
    {
      "nct_id": "NCT02626182",
      "title": "Evaluation and Treatment of Pulmonary Vascular Disease in Moderate to Severe CF",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1",
        "PHASE2"
      ],
      "conditions": [
        "Cystic Fibrosis"
      ],
      "interventions": [
        {
          "name": "sildenafil",
          "type": "DRUG"
        },
        {
          "name": "placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "National Jewish Health",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 14,
      "start_date": "2015-12",
      "completion_date": "2018-01-29",
      "has_results": true,
      "last_update_posted_date": "2019-07-24",
      "last_synced_at": "2026-09-24T22:22:15.955Z",
      "location_count": 1,
      "location_summary": "Denver, Colorado",
      "locations": [
        {
          "city": "Denver",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02626182"
    },
    {
      "nct_id": "NCT00734604",
      "title": "A Study for Patients With Erectile Dysfunction to Test Whether Tadalafil Taken Once a Day Can Better Improve Psychological Outcomes.",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Erectile Dysfunction"
      ],
      "interventions": [
        {
          "name": "tadalafil once a day [T(OaD)]",
          "type": "DRUG"
        },
        {
          "name": "sildenafil citrate as needed [S(PRN)]",
          "type": "DRUG"
        },
        {
          "name": "tadalafil as needed [T(PRN)]",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Eli Lilly and Company",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "MALE",
        "summary": "18 Years and older · Male only"
      },
      "enrollment_count": 378,
      "start_date": "2008-08",
      "completion_date": "2009-09",
      "has_results": true,
      "last_update_posted_date": "2010-11-18",
      "last_synced_at": "2026-09-24T22:22:15.955Z",
      "location_count": 7,
      "location_summary": "Huntsville, Alabama • Newport Beach, California • Middlebury, Connecticut + 4 more",
      "locations": [
        {
          "city": "Huntsville",
          "state": "Alabama"
        },
        {
          "city": "Newport Beach",
          "state": "California"
        },
        {
          "city": "Middlebury",
          "state": "Connecticut"
        },
        {
          "city": "Plantation",
          "state": "Florida"
        },
        {
          "city": "Knoxville",
          "state": "Tennessee"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00734604"
    },
    {
      "nct_id": "NCT03382106",
      "title": "Smoking Cessation and Functional CT Assessment",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Emphysema"
      ],
      "interventions": [
        {
          "name": "Sildenafil 20 MG",
          "type": "DRUG"
        },
        {
          "name": "Placebo Oral Tablet",
          "type": "DRUG"
        },
        {
          "name": "Pulse wave velocity",
          "type": "DIAGNOSTIC_TEST"
        },
        {
          "name": "Carotid artery compliance and stiffness",
          "type": "DIAGNOSTIC_TEST"
        },
        {
          "name": "Pressure wave reflection",
          "type": "DIAGNOSTIC_TEST"
        }
      ],
      "intervention_types": [
        "DRUG",
        "DIAGNOSTIC_TEST"
      ],
      "sponsor": "Eric A. Hoffman",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "21 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "21 Years to 65 Years"
      },
      "enrollment_count": 162,
      "start_date": "2018-03-19",
      "completion_date": "2024-09-24",
      "has_results": false,
      "last_update_posted_date": "2025-02-14",
      "last_synced_at": "2026-09-24T22:22:15.955Z",
      "location_count": 1,
      "location_summary": "Iowa City, Iowa",
      "locations": [
        {
          "city": "Iowa City",
          "state": "Iowa"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03382106"
    },
    {
      "nct_id": "NCT00796510",
      "title": "Study Providing Monotherapy (Sitaxsentan) And Combination Therapy (Sitaxsentan+Sildenafil) To Subjects With Pulmonary Arterial Hypertension (PAH) To Assess Long-Term Safety",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Pulmonary Arterial Hypertension",
        "Pulmonary Hypertension"
      ],
      "interventions": [
        {
          "name": "Sitaxsentan",
          "type": "DRUG"
        },
        {
          "name": "Sitaxsentan and Sildenafil",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Pfizer",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "16 Years",
        "maximum_age": "80 Years",
        "sex": "ALL",
        "summary": "16 Years to 80 Years"
      },
      "enrollment_count": 3,
      "start_date": "2010-07",
      "completion_date": "2011-01",
      "has_results": true,
      "last_update_posted_date": "2018-10-25",
      "last_synced_at": "2026-09-24T22:22:15.955Z",
      "location_count": 1,
      "location_summary": "Fountain Valley, California",
      "locations": [
        {
          "city": "Fountain Valley",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00796510"
    },
    {
      "nct_id": "NCT06324396",
      "title": "IMProving DRug Dosing and Outcomes for Single VEntricle Patients With Fontan Associated Liver Disease",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Fontan Circulation"
      ],
      "interventions": [
        {
          "name": "Sildenafil 10mg oral tablet (participants <20kg), or 20mg oral tablet (participants ≥20kg)",
          "type": "DRUG"
        },
        {
          "name": "Pravastatin 20 mg oral tablet (ages <13 years), or 40 mg oral tablet (≥14 years)",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Children's Mercy Hospital Kansas City",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "8 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "8 Years and older"
      },
      "enrollment_count": 15,
      "start_date": "2024-03-01",
      "completion_date": "2026-12-31",
      "has_results": false,
      "last_update_posted_date": "2026-01-02",
      "last_synced_at": "2026-09-24T22:22:15.955Z",
      "location_count": 1,
      "location_summary": "Kansas City, Missouri",
      "locations": [
        {
          "city": "Kansas City",
          "state": "Missouri"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06324396"
    }
  ]
}