{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=L-thyroxine+%28L-T4%29",
    "query": {
      "intervention": "L-thyroxine (L-T4)"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 84,
    "total_pages": 9,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=L-thyroxine+%28L-T4%29&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-22T19:12:58.614Z",
  "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": "NCT02320669",
      "title": "Phase 3 Triiodothyronine Supplementation for Infants After Cardiopulmonary Bypass",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Congenital Heart Defects"
      ],
      "interventions": [
        {
          "name": "Triostat",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Seattle Children's Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": "5 Months",
        "sex": "ALL",
        "summary": "Up to 5 Months"
      },
      "enrollment_count": 220,
      "start_date": "2014-11",
      "completion_date": "2019-10",
      "has_results": true,
      "last_update_posted_date": "2024-04-09",
      "last_synced_at": "2026-09-22T19:12:58.614Z",
      "location_count": 3,
      "location_summary": "Los Angeles, California • Palo Alto, California • Seattle, Washington",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Palo Alto",
          "state": "California"
        },
        {
          "city": "Seattle",
          "state": "Washington"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02320669"
    },
    {
      "nct_id": "NCT03787303",
      "title": "Study of Euthyroid Hypothyroxinemia in Metastatic Breast Carcinoma",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Metastatic Breast Cancer",
        "Thyroid Dysfunction"
      ],
      "interventions": [
        {
          "name": "Triiodothyronine (T3)",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Aultman Health Foundation",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "105 Years",
        "sex": "ALL",
        "summary": "18 Years to 105 Years"
      },
      "enrollment_count": 7,
      "start_date": "2019-03-01",
      "completion_date": "2022-03-09",
      "has_results": true,
      "last_update_posted_date": "2022-05-13",
      "last_synced_at": "2026-09-22T19:12:58.614Z",
      "location_count": 1,
      "location_summary": "Canton, Ohio",
      "locations": [
        {
          "city": "Canton",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03787303"
    },
    {
      "nct_id": "NCT04098991",
      "title": "Improving White Matter Integrity With Thyroid Hormone",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Hypothyroidism"
      ],
      "interventions": [
        {
          "name": "Levothyroxine",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of Illinois at Chicago",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "21 Years",
        "maximum_age": "60 Years",
        "sex": "ALL",
        "summary": "21 Years to 60 Years"
      },
      "enrollment_count": 5,
      "start_date": "2017-11-08",
      "completion_date": "2019-11-08",
      "has_results": false,
      "last_update_posted_date": "2020-04-10",
      "last_synced_at": "2026-09-22T19:12:58.614Z",
      "location_count": 1,
      "location_summary": "Chicago, Illinois",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04098991"
    },
    {
      "nct_id": "NCT00565032",
      "title": "Postpartum Thyroid Measures and Mood",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Postpartum Depression"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Oklahoma State University Center for Health Sciences",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "50 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 50 Years · Female only"
      },
      "enrollment_count": 75,
      "start_date": "2000-01",
      "completion_date": "2001-08",
      "has_results": false,
      "last_update_posted_date": "2010-01-28",
      "last_synced_at": "2026-09-22T19:12:58.614Z",
      "location_count": 1,
      "location_summary": "Tulsa, Oklahoma",
      "locations": [
        {
          "city": "Tulsa",
          "state": "Oklahoma"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00565032"
    },
    {
      "nct_id": "NCT01299337",
      "title": "Acceleration and Relapse Prevention With Triiodothyronine (T3) as an Adjunct to Electroconvulsive Therapy (ECT)",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Depression"
      ],
      "interventions": [
        {
          "name": "T3",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Mayo Clinic",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "64 Years",
        "sex": "ALL",
        "summary": "18 Years to 64 Years"
      },
      "enrollment_count": 29,
      "start_date": "2008-06",
      "completion_date": "2012-04",
      "has_results": false,
      "last_update_posted_date": "2012-05-11",
      "last_synced_at": "2026-09-22T19:12:58.614Z",
      "location_count": 1,
      "location_summary": "Rochester, Minnesota",
      "locations": [
        {
          "city": "Rochester",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01299337"
    },
    {
      "nct_id": "NCT02760056",
      "title": "Thyroid Hormone for Remyelination in Multiple Sclerosis (MS): A Safety and Dose Finding Study",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Multiple Sclerosis"
      ],
      "interventions": [
        {
          "name": "Liothyronine sodium",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Oregon Health and Science University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "50 Years",
        "sex": "ALL",
        "summary": "18 Years to 50 Years"
      },
      "enrollment_count": 15,
      "start_date": "2016-06-06",
      "completion_date": "2017-01-10",
      "has_results": true,
      "last_update_posted_date": "2018-11-19",
      "last_synced_at": "2026-09-22T19:12:58.614Z",
      "location_count": 1,
      "location_summary": "Portland, Oregon",
      "locations": [
        {
          "city": "Portland",
          "state": "Oregon"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02760056"
    },
    {
      "nct_id": "NCT02506751",
      "title": "Open-label Study of Liothyronine in MS",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Multiple Sclerosis, Relapsing-Remitting",
        "Multiple Sclerosis, Secondary Progressive",
        "Multiple Sclerosis, Primary Progressive"
      ],
      "interventions": [
        {
          "name": "liothyronine",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Johns Hopkins University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "58 Years",
        "sex": "ALL",
        "summary": "18 Years to 58 Years"
      },
      "enrollment_count": 20,
      "start_date": "2015-07",
      "completion_date": "2017-09-18",
      "has_results": false,
      "last_update_posted_date": "2018-02-12",
      "last_synced_at": "2026-09-22T19:12:58.614Z",
      "location_count": 1,
      "location_summary": "Baltimore, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02506751"
    },
    {
      "nct_id": "NCT00562367",
      "title": "Biochemical Brain Changes Correlated With The Antidepressant Effect Of Thyroid Hormones",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Major Depressive Disorder"
      ],
      "interventions": [
        {
          "name": "Cytomel (liothyronine)",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Massachusetts General Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "18 Years to 65 Years"
      },
      "enrollment_count": 30,
      "start_date": "2001-10",
      "completion_date": "2004-09",
      "has_results": false,
      "last_update_posted_date": "2007-11-22",
      "last_synced_at": "2026-09-22T19:12:58.614Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00562367"
    },
    {
      "nct_id": "NCT05823012",
      "title": "Study of XP-8121 For the Treatment of Adult Subjects With Hypothyroidism",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Hypothyroidism"
      ],
      "interventions": [
        {
          "name": "levothyroxine sodium",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Xeris Pharmaceuticals",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "18 Years to 65 Years"
      },
      "enrollment_count": 46,
      "start_date": "2023-05-15",
      "completion_date": "2024-02-22",
      "has_results": true,
      "last_update_posted_date": "2025-07-03",
      "last_synced_at": "2026-09-22T19:12:58.614Z",
      "location_count": 6,
      "location_summary": "Chula Vista, California • Montclair, California • Miami Lakes, Florida + 3 more",
      "locations": [
        {
          "city": "Chula Vista",
          "state": "California"
        },
        {
          "city": "Montclair",
          "state": "California"
        },
        {
          "city": "Miami Lakes",
          "state": "Florida"
        },
        {
          "city": "San Antonio",
          "state": "Texas"
        },
        {
          "city": "Sugar Land",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05823012"
    },
    {
      "nct_id": "NCT02567877",
      "title": "Is Levothyroxine Alone Adequate Thyroid Hormone Replacement?",
      "overall_status": "TERMINATED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Postsurgical Hypothyroidism",
        "Hypothyroidism"
      ],
      "interventions": [
        {
          "name": "thyroidectomy",
          "type": "PROCEDURE"
        },
        {
          "name": "levothyroxine in thyroidectomy patients",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "PROCEDURE",
        "DRUG"
      ],
      "sponsor": "University of Colorado, Denver",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "18 Years to 75 Years"
      },
      "enrollment_count": 12,
      "start_date": "2016-11",
      "completion_date": "2020-06",
      "has_results": false,
      "last_update_posted_date": "2023-06-08",
      "last_synced_at": "2026-09-22T19:12:58.614Z",
      "location_count": 1,
      "location_summary": "Aurora, Colorado",
      "locations": [
        {
          "city": "Aurora",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02567877"
    }
  ]
}