{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=chlorthalidone&page=2",
    "query": {
      "intervention": "chlorthalidone",
      "page": 2
    },
    "page_size": 10
  },
  "pagination": {
    "page": 2,
    "page_size": 10,
    "total_count": 10,
    "total_pages": 1,
    "next_page_url": null,
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=chlorthalidone&page=1&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-09-25T10:57:57.131Z",
  "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": "NCT00563901",
      "title": "Analyzing How Genetics May Affect Response to High Blood Pressure Medications",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Hypertension",
        "Coronary Disease",
        "Cerebrovascular Accident"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "University of Alabama at Birmingham",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "55 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "55 Years and older"
      },
      "enrollment_count": 37939,
      "start_date": "2000-09",
      "completion_date": "2004-05",
      "has_results": false,
      "last_update_posted_date": "2014-03-04",
      "last_synced_at": "2026-09-25T10:57:57.131Z",
      "location_count": 2,
      "location_summary": "Minneapolis, Minnesota • Houston, Texas",
      "locations": [
        {
          "city": "Minneapolis",
          "state": "Minnesota"
        },
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00563901"
    },
    {
      "nct_id": "NCT01368536",
      "title": "Study to Evaluate the Efficacy and Safety of the Combination of Valturna and Amlodipine or Valturna and Chlorthalidone Versus Valturna Alone in Patients With Stage 2 Hypertension and Diabetes",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Hypertension",
        "Stage 2 Hypertension",
        "Diabetes"
      ],
      "interventions": [
        {
          "name": "Valturna",
          "type": "DRUG"
        },
        {
          "name": "Amlodipine",
          "type": "DRUG"
        },
        {
          "name": "Chlorthalidone",
          "type": "DRUG"
        },
        {
          "name": "Placebo of Valturna Tablet",
          "type": "DRUG"
        },
        {
          "name": "Placebo Capsule",
          "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": 975,
      "start_date": "2011-05",
      "completion_date": "2012-02",
      "has_results": true,
      "last_update_posted_date": "2013-03-21",
      "last_synced_at": "2026-09-25T10:57:57.131Z",
      "location_count": 95,
      "location_summary": "Athens, Alabama • Florence, Alabama • Huntsville, Alabama + 78 more",
      "locations": [
        {
          "city": "Athens",
          "state": "Alabama"
        },
        {
          "city": "Florence",
          "state": "Alabama"
        },
        {
          "city": "Huntsville",
          "state": "Alabama"
        },
        {
          "city": "Montgomery",
          "state": "Alabama"
        },
        {
          "city": "Muscle Shoals",
          "state": "Alabama"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01368536"
    },
    {
      "nct_id": "NCT05293756",
      "title": "OPtimizing Technology to Improve Medication Adherence and BP Control (OPTIMA-BP)",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Hypertension",
        "Self-Management",
        "Technology",
        "Quality of Life"
      ],
      "interventions": [
        {
          "name": "OPTIMA-BP Intervention",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Case Western Reserve University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "50 Years and older"
      },
      "enrollment_count": 208,
      "start_date": "2021-02-14",
      "completion_date": "2027-05-31",
      "has_results": false,
      "last_update_posted_date": "2026-04-03",
      "last_synced_at": "2026-09-25T10:57:57.131Z",
      "location_count": 1,
      "location_summary": "Cleveland, Ohio",
      "locations": [
        {
          "city": "Cleveland",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05293756"
    },
    {
      "nct_id": "NCT02711670",
      "title": "Night Time Use of Thiazide Diuretics for Improved Reduction in Stone Risk in Stone Formers With Elevated Urine Calcium",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Kidney Stones"
      ],
      "interventions": [
        {
          "name": "chlorthalidone",
          "type": "DRUG"
        },
        {
          "name": "Hydrochlorothiazide",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "VA New York Harbor Healthcare System",
      "sponsor_class": "FED",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "80 Years",
        "sex": "ALL",
        "summary": "18 Years to 80 Years"
      },
      "enrollment_count": 10,
      "start_date": "2014-02",
      "completion_date": "2017-06",
      "has_results": false,
      "last_update_posted_date": "2023-04-27",
      "last_synced_at": "2026-09-25T10:57:57.131Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02711670"
    },
    {
      "nct_id": "NCT00847626",
      "title": "Efficacy and Safety of Azilsartan Medoxomil Combined With Chlorthalidone in Participants With Moderate to Severe Hypertension",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Hypertension"
      ],
      "interventions": [
        {
          "name": "Azilsartan medoxomil and chlorthalidone",
          "type": "DRUG"
        },
        {
          "name": "Chlorthalidone",
          "type": "DRUG"
        },
        {
          "name": "Azilsartan medoxomil",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Takeda",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 1711,
      "start_date": "2009-01",
      "completion_date": "2010-07",
      "has_results": true,
      "last_update_posted_date": "2012-02-07",
      "last_synced_at": "2026-09-25T10:57:57.131Z",
      "location_count": 84,
      "location_summary": "Birmingham, Alabama • Columbiana, Alabama • Tuscaloosa, Alabama + 81 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Columbiana",
          "state": "Alabama"
        },
        {
          "city": "Tuscaloosa",
          "state": "Alabama"
        },
        {
          "city": "Chandler",
          "state": "Arizona"
        },
        {
          "city": "Phoenix",
          "state": "Arizona"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00847626"
    },
    {
      "nct_id": "NCT05275907",
      "title": "Mechanism of Hypertension Treatments in Liver Transplant Recipients (BLOCK LTR-HTN)",
      "overall_status": "WITHDRAWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "High Blood Pressure",
        "Liver Transplant",
        "Renal Function Abnormal"
      ],
      "interventions": [
        {
          "name": "Amlodipine Besylate",
          "type": "DRUG"
        },
        {
          "name": "Chlorthalidone",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Northwestern University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 0,
      "start_date": "2022-07-12",
      "completion_date": "2023-10-04",
      "has_results": false,
      "last_update_posted_date": "2023-10-13",
      "last_synced_at": "2026-09-25T10:57:57.131Z",
      "location_count": 1,
      "location_summary": "Chicago, Illinois",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05275907"
    },
    {
      "nct_id": "NCT05171686",
      "title": "Diuretics and Volume Overload in Early CKD",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Chronic Kidney Disease",
        "Hypertension"
      ],
      "interventions": [
        {
          "name": "Diuretic augmentation (hydrochlorothiazide, chlorthalidone, furosemide, torsemide, or bumetanide)",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "VA Office of Research and Development",
      "sponsor_class": "FED",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 49,
      "start_date": "2023-02-01",
      "completion_date": "2025-10-02",
      "has_results": false,
      "last_update_posted_date": "2026-09-21",
      "last_synced_at": "2026-09-25T10:57:57.131Z",
      "location_count": 1,
      "location_summary": "Houston, Texas",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05171686"
    },
    {
      "nct_id": "NCT02665117",
      "title": "Preventing Metabolic Side Effects of Thiazide Diuretics With KMgCitrate",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Hypertension"
      ],
      "interventions": [
        {
          "name": "Potassium Magnesium Citrate (KMgCit)",
          "type": "DRUG"
        },
        {
          "name": "Potassium Chloride (KCl)",
          "type": "DRUG"
        },
        {
          "name": "Chlorthalidone",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of Texas Southwestern Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "21 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "21 Years and older"
      },
      "enrollment_count": 61,
      "start_date": "2015-01",
      "completion_date": "2022-11-04",
      "has_results": true,
      "last_update_posted_date": "2023-10-25",
      "last_synced_at": "2026-09-25T10:57:57.131Z",
      "location_count": 3,
      "location_summary": "Dallas, Texas",
      "locations": [
        {
          "city": "Dallas",
          "state": "Texas"
        },
        {
          "city": "Dallas",
          "state": "Texas"
        },
        {
          "city": "Dallas",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02665117"
    },
    {
      "nct_id": "NCT04192110",
      "title": "Association of Diuretics With Change in Extracellular Volume, Natriuretic Peptides, Symptoms, and Cardiovascular Outcomes in CKD",
      "overall_status": "WITHDRAWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Chronic Kidney Disease"
      ],
      "interventions": [
        {
          "name": "Diuretic initiation or augmentation",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "VA Office of Research and Development",
      "sponsor_class": "FED",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 0,
      "start_date": "2020-08-11",
      "completion_date": "2020-08-11",
      "has_results": false,
      "last_update_posted_date": "2021-12-09",
      "last_synced_at": "2026-09-25T10:57:57.131Z",
      "location_count": 1,
      "location_summary": "Dallas, Texas",
      "locations": [
        {
          "city": "Dallas",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04192110"
    },
    {
      "nct_id": "NCT01033071",
      "title": "Efficacy and Safety of Azilsartan Medoxomil and Chlorthalidone Compared to Olmesartan Medoxomil and Hydrochlorothiazide in Participants With Moderate to Severe Hypertension.",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Essential Hypertension"
      ],
      "interventions": [
        {
          "name": "Azilsartan medoxomil and chlorthalidone",
          "type": "DRUG"
        },
        {
          "name": "Olmesartan medoxomil and hydrochlorothiazide",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Takeda",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 1071,
      "start_date": "2010-01",
      "completion_date": "2010-11",
      "has_results": true,
      "last_update_posted_date": "2012-02-07",
      "last_synced_at": "2026-09-25T10:57:57.131Z",
      "location_count": 84,
      "location_summary": "Gulf Shores, Alabama • Litchfield Park, Arizona • Mesa, Arizona + 81 more",
      "locations": [
        {
          "city": "Gulf Shores",
          "state": "Alabama"
        },
        {
          "city": "Litchfield Park",
          "state": "Arizona"
        },
        {
          "city": "Mesa",
          "state": "Arizona"
        },
        {
          "city": "Scottsdale",
          "state": "Arizona"
        },
        {
          "city": "Tucson",
          "state": "Arizona"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01033071"
    }
  ]
}