{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Hydrochlorothiazide",
    "query": {
      "intervention": "Hydrochlorothiazide"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 156,
    "total_pages": 16,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Hydrochlorothiazide&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-06-07T10:16:11.553Z",
  "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": "NCT00246519",
      "title": "Pharmacogenomic Evaluation of Antihypertensive Responses",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Hypertension"
      ],
      "interventions": [
        {
          "name": "Hydrochlorothiazide",
          "type": "DRUG"
        },
        {
          "name": "Atenolol",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of Florida",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "17 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "17 Years to 65 Years"
      },
      "enrollment_count": 1701,
      "start_date": "2005-10",
      "completion_date": "2010-12",
      "has_results": true,
      "last_update_posted_date": "2018-05-07",
      "last_synced_at": "2026-06-07T10:16:11.553Z",
      "location_count": 3,
      "location_summary": "Gainesville, Florida • Atlanta, Georgia • Rochester, Minnesota",
      "locations": [
        {
          "city": "Gainesville",
          "state": "Florida"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "Rochester",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00246519"
    },
    {
      "nct_id": "NCT02814552",
      "title": "OPTImizing Precision of Hypertension Care to Maximize Blood Pressure Control Pilot (OPTI-BP Pilot)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "High Blood Pressure"
      ],
      "interventions": [
        {
          "name": "HTN PRA App",
          "type": "OTHER"
        },
        {
          "name": "Blood Sample",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Florida",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "18 Years to 65 Years"
      },
      "enrollment_count": 47,
      "start_date": "2016-06-18",
      "completion_date": "2018-06-30",
      "has_results": false,
      "last_update_posted_date": "2018-10-25",
      "last_synced_at": "2026-06-07T10:16:11.553Z",
      "location_count": 3,
      "location_summary": "Macclenny, Florida • Old Town, Florida • Tallahassee, Florida",
      "locations": [
        {
          "city": "Macclenny",
          "state": "Florida"
        },
        {
          "city": "Old Town",
          "state": "Florida"
        },
        {
          "city": "Tallahassee",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02814552"
    },
    {
      "nct_id": "NCT00402103",
      "title": "An Assessment of Long Term Safety of the Combination of Aliskiren / Amlodipine in Patients With High Blood Pressure",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Hypertension"
      ],
      "interventions": [
        {
          "name": "Aliskiren",
          "type": "DRUG"
        },
        {
          "name": "Amlodipine",
          "type": "DRUG"
        },
        {
          "name": "Hydrochlorothiazide",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Novartis",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 556,
      "start_date": "2006-11",
      "completion_date": "2008-04",
      "has_results": true,
      "last_update_posted_date": "2011-03-10",
      "last_synced_at": "2026-06-07T10:16:11.553Z",
      "location_count": 1,
      "location_summary": "Santa Fe, New Mexico",
      "locations": [
        {
          "city": "Santa Fe",
          "state": "New Mexico"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00402103"
    },
    {
      "nct_id": "NCT00005520",
      "title": "Genetic Epidemiology of Responses to Antihypertensives",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Cardiovascular Diseases",
        "Heart Diseases",
        "Hypertension"
      ],
      "interventions": [
        {
          "name": "Hydrochlorothiazide",
          "type": "DRUG"
        },
        {
          "name": "Candesartan",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Mayo Clinic",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "60 Years",
        "sex": "ALL",
        "summary": "18 Years to 60 Years"
      },
      "enrollment_count": 1200,
      "start_date": "1997-02",
      "completion_date": "2008-01",
      "has_results": false,
      "last_update_posted_date": "2013-01-17",
      "last_synced_at": "2026-06-07T10:16:11.553Z",
      "location_count": 1,
      "location_summary": "Rochester, Minnesota",
      "locations": [
        {
          "city": "Rochester",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00005520"
    },
    {
      "nct_id": "NCT00605072",
      "title": "The Antihypertensives and Vascular, Endothelial and Cognitive Function Trial",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Cognitive Impairment",
        "Hypertension",
        "Aging"
      ],
      "interventions": [
        {
          "name": "candesartan",
          "type": "DRUG"
        },
        {
          "name": "lisinopril",
          "type": "DRUG"
        },
        {
          "name": "hydrochlorothiazide",
          "type": "DRUG"
        },
        {
          "name": "nifedipine, long acting",
          "type": "DRUG"
        },
        {
          "name": "metoprolol, long-acting",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of Southern California",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "60 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "60 Years and older"
      },
      "enrollment_count": 53,
      "start_date": "2008-01",
      "completion_date": "2012-12",
      "has_results": true,
      "last_update_posted_date": "2013-02-15",
      "last_synced_at": "2026-06-07T10:16:11.553Z",
      "location_count": 2,
      "location_summary": "Los Angeles, California • Boston, Massachusetts",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00605072"
    },
    {
      "nct_id": "NCT00478335",
      "title": "Pharmacologic Treatment of Congenital Nephrogenic Diabetes Insipidus",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Nephrogenic Diabetes Insipidus"
      ],
      "interventions": [
        {
          "name": "sildenafil",
          "type": "DRUG"
        },
        {
          "name": "calcitonin",
          "type": "DRUG"
        },
        {
          "name": "hydrochlorothiazide/amiloride",
          "type": "DRUG"
        },
        {
          "name": "indomethacin",
          "type": "DRUG"
        },
        {
          "name": "Placebo for sildenafil",
          "type": "DRUG"
        },
        {
          "name": "placebo for calcitonin",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of Colorado, Denver",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "5 Years",
        "maximum_age": "25 Years",
        "sex": "MALE",
        "summary": "5 Years to 25 Years · Male only"
      },
      "enrollment_count": 4,
      "start_date": "2007-05",
      "completion_date": "2012-10",
      "has_results": true,
      "last_update_posted_date": "2018-02-12",
      "last_synced_at": "2026-06-07T10:16:11.553Z",
      "location_count": 1,
      "location_summary": "Aurora, Colorado",
      "locations": [
        {
          "city": "Aurora",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00478335"
    },
    {
      "nct_id": "NCT00778674",
      "title": "Bioequivalence Study of Benazepril HCl / Hydrochlorothiazide 20 mg/ 25 mg Tablets Under Fed Conditions",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Healthy"
      ],
      "interventions": [
        {
          "name": "Benazepril HCl/ Hydrochlorothiazide 20 mg/ 25 mg Tablets",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Ranbaxy Laboratories Limited",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 30,
      "start_date": "2004-10",
      "completion_date": "2004-12",
      "has_results": false,
      "last_update_posted_date": "2008-10-23",
      "last_synced_at": "2026-06-07T10:16:11.553Z",
      "location_count": 1,
      "location_summary": "Chapel Hill, North Carolina",
      "locations": [
        {
          "city": "Chapel Hill",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00778674"
    },
    {
      "nct_id": "NCT00439738",
      "title": "Safety/Efficacy of Valsartan/Hydrochlorothiazide Combination Compared to Hydrochlorothiazide in Obese Hypertensive Adults",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Hypertension"
      ],
      "interventions": [
        {
          "name": "HCTZ + Amlodipine",
          "type": "DRUG"
        },
        {
          "name": "Valsartan/HCTZ",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Novartis Pharmaceuticals",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "40 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "40 Years and older"
      },
      "enrollment_count": 412,
      "start_date": "2006-12",
      "completion_date": null,
      "has_results": true,
      "last_update_posted_date": "2017-05-16",
      "last_synced_at": "2026-06-07T10:16:11.553Z",
      "location_count": 5,
      "location_summary": "Muscle Shoals, Alabama • Westlake Village, California • Oklahoma City, Oklahoma + 2 more",
      "locations": [
        {
          "city": "Muscle Shoals",
          "state": "Alabama"
        },
        {
          "city": "Westlake Village",
          "state": "California"
        },
        {
          "city": "Oklahoma City",
          "state": "Oklahoma"
        },
        {
          "city": "Euless",
          "state": "Texas"
        },
        {
          "city": "Port Orchard",
          "state": "Washington"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00439738"
    },
    {
      "nct_id": "NCT00990301",
      "title": "A Study to Compare the Relative Bioavailability of Moexipril HCl/Hydrochlorothiazide in Healthy Adult Volunteers Under Fasting Conditions",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Healthy"
      ],
      "interventions": [
        {
          "name": "Moexipril HCl/ Hydrochlorothiazide 15mg/ 25mg Tablet, Paddock Laboratories, Inc.",
          "type": "DRUG"
        },
        {
          "name": "Uniretic® 15mg/25mg Tablets",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Paddock Laboratories, 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": 48,
      "start_date": null,
      "completion_date": null,
      "has_results": false,
      "last_update_posted_date": "2013-11-25",
      "last_synced_at": "2026-06-07T10:16:11.553Z",
      "location_count": 1,
      "location_summary": "Pittsburgh, Pennsylvania",
      "locations": [
        {
          "city": "Pittsburgh",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00990301"
    },
    {
      "nct_id": "NCT01658657",
      "title": "A Pilot Study of Plasma Renin Activity Guided vs Generic Combination Therapy for Hypertension",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Hypertension",
        "Plasma Renin Activity"
      ],
      "interventions": [
        {
          "name": "Hydrochlorothiazide",
          "type": "DRUG"
        },
        {
          "name": "Lisinopril",
          "type": "DRUG"
        },
        {
          "name": "Amlodipine",
          "type": "DRUG"
        },
        {
          "name": "metoprolol",
          "type": "DRUG"
        },
        {
          "name": "lisinopril/hydrochlorothiazide",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of North Carolina, Chapel Hill",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 17,
      "start_date": "2012-10",
      "completion_date": "2014-07",
      "has_results": true,
      "last_update_posted_date": "2015-08-27",
      "last_synced_at": "2026-06-07T10:16:11.553Z",
      "location_count": 1,
      "location_summary": "Chapel Hill, North Carolina",
      "locations": [
        {
          "city": "Chapel Hill",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01658657"
    }
  ]
}