{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Oral+ferrous+sulfate",
    "query": {
      "intervention": "Oral ferrous sulfate"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 61,
    "total_pages": 7,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Oral+ferrous+sulfate&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-24T20:19:09.981Z",
  "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": "NCT01837030",
      "title": "Capsule Endoscopy Versus Conservative Therapy for Obscure Gastrointestinal Bleeding",
      "overall_status": "WITHDRAWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Hemorrhage",
        "Anemia"
      ],
      "interventions": [
        {
          "name": "Ferrous sulfate",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Capsule Endoscopy",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "DEVICE"
      ],
      "sponsor": "Medical University of South Carolina",
      "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": "2013-03",
      "completion_date": "2013-03",
      "has_results": false,
      "last_update_posted_date": "2018-06-14",
      "last_synced_at": "2026-09-24T20:19:09.981Z",
      "location_count": 1,
      "location_summary": "Charleston, South Carolina",
      "locations": [
        {
          "city": "Charleston",
          "state": "South Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01837030"
    },
    {
      "nct_id": "NCT04497012",
      "title": "Iron Supplementation and Intestinal Health",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Anemia of Prematurity",
        "Very Low Birth Weight Infant"
      ],
      "interventions": [
        {
          "name": "2mg/kg/day Iron Sulfate",
          "type": "DRUG"
        },
        {
          "name": "6 mg/kg/day Iron Sulfate",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of South Florida",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "1 Day",
        "maximum_age": "6 Months",
        "sex": "ALL",
        "summary": "1 Day to 6 Months"
      },
      "enrollment_count": 183,
      "start_date": "2020-11-17",
      "completion_date": "2025-07-31",
      "has_results": false,
      "last_update_posted_date": "2025-01-22",
      "last_synced_at": "2026-09-24T20:19:09.981Z",
      "location_count": 1,
      "location_summary": "Tampa, Florida",
      "locations": [
        {
          "city": "Tampa",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04497012"
    },
    {
      "nct_id": "NCT01755455",
      "title": "Does a Daily Iron Tablet Improve Anemia in Cystic Fibrosis",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Cystic Fibrosis",
        "Anemia, Iron-Deficiency"
      ],
      "interventions": [
        {
          "name": "Ferrous sulfate 325mg",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Dartmouth-Hitchcock Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "70 Years",
        "sex": "ALL",
        "summary": "18 Years to 70 Years"
      },
      "enrollment_count": 22,
      "start_date": "2011-06",
      "completion_date": "2012-11",
      "has_results": true,
      "last_update_posted_date": "2017-03-16",
      "last_synced_at": "2026-09-24T20:19:09.981Z",
      "location_count": 2,
      "location_summary": "Portland, Maine • Lebanon, New Hampshire",
      "locations": [
        {
          "city": "Portland",
          "state": "Maine"
        },
        {
          "city": "Lebanon",
          "state": "New Hampshire"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01755455"
    },
    {
      "nct_id": "NCT05047211",
      "title": "Intravenous Iron vs. Oral Iron Supplementation for Postpartum Anemia",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Anemia, Iron Deficiency",
        "Delivery Complication"
      ],
      "interventions": [
        {
          "name": "Ferrous sulfate",
          "type": "DRUG"
        },
        {
          "name": "Iron dextran",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "The University of Texas Medical Branch, Galveston",
      "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": 40,
      "start_date": "2021-10-07",
      "completion_date": "2023-04-15",
      "has_results": true,
      "last_update_posted_date": "2023-08-29",
      "last_synced_at": "2026-09-24T20:19:09.981Z",
      "location_count": 1,
      "location_summary": "Galveston, Texas",
      "locations": [
        {
          "city": "Galveston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05047211"
    },
    {
      "nct_id": "NCT02327546",
      "title": "Effects of Ferrous Sulfate on the Pharmacokinetics of AKB-6548",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Healthy Volunteers"
      ],
      "interventions": [
        {
          "name": "AKB-6548",
          "type": "DRUG"
        },
        {
          "name": "Ferrous Sulfate",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Akebia Therapeutics",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "55 Years",
        "sex": "MALE",
        "summary": "18 Years to 55 Years · Male only"
      },
      "enrollment_count": 10,
      "start_date": "2014-12",
      "completion_date": "2015-02",
      "has_results": false,
      "last_update_posted_date": "2018-11-14",
      "last_synced_at": "2026-09-24T20:19:09.981Z",
      "location_count": 1,
      "location_summary": "Kalamazoo, Michigan",
      "locations": [
        {
          "city": "Kalamazoo",
          "state": "Michigan"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02327546"
    },
    {
      "nct_id": "NCT00994318",
      "title": "Ferric Carboxymaltose (FCM) Assessment in Subjects With Iron Deficiency Anaemia and Non-dialysis-dependent Chronic Kidney Disease (NDD-CKD)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Iron Deficiency Anaemia",
        "Chronic Kidney Disease"
      ],
      "interventions": [
        {
          "name": "FCM (Ferric carboxymaltose) high ferritin target",
          "type": "DRUG"
        },
        {
          "name": "FCM (Ferric carboxymaltose) low ferritin target",
          "type": "DRUG"
        },
        {
          "name": "Oral Iron (Ferrous sulphate)",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Vifor Pharma",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 626,
      "start_date": "2009-12",
      "completion_date": "2014-02",
      "has_results": true,
      "last_update_posted_date": "2014-05-20",
      "last_synced_at": "2026-09-24T20:19:09.981Z",
      "location_count": 1,
      "location_summary": "Wilmington, North Carolina",
      "locations": [
        {
          "city": "Wilmington",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00994318"
    },
    {
      "nct_id": "NCT04278651",
      "title": "Early Antenatal Support for Iron Deficiency Anemia",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Pregnancy Related",
        "Anemia, Iron Deficiency",
        "Anemia of Pregnancy"
      ],
      "interventions": [
        {
          "name": "Ferumoxytol",
          "type": "DRUG"
        },
        {
          "name": "Ferrous Sulfate",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Thomas Jefferson University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "65 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 65 Years · Female only"
      },
      "enrollment_count": 80,
      "start_date": "2021-09-29",
      "completion_date": "2026-12-30",
      "has_results": false,
      "last_update_posted_date": "2025-12-02",
      "last_synced_at": "2026-09-24T20:19:09.981Z",
      "location_count": 1,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04278651"
    },
    {
      "nct_id": "NCT01125163",
      "title": "Trial Comparing Iron Supplementation Versus Routine Iron Intake in Very Low Birth Weight Infants",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Iron Deficiency Anemia"
      ],
      "interventions": [
        {
          "name": "Iron Supplement",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "multivitamin",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "The University of Texas Health Science Center, Houston",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "24 Weeks",
        "maximum_age": "32 Weeks",
        "sex": "ALL",
        "summary": "24 Weeks to 32 Weeks"
      },
      "enrollment_count": 150,
      "start_date": "2010-05",
      "completion_date": "2012-02",
      "has_results": true,
      "last_update_posted_date": "2019-01-04",
      "last_synced_at": "2026-09-24T20:19:09.981Z",
      "location_count": 1,
      "location_summary": "Houston, Texas",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01125163"
    },
    {
      "nct_id": "NCT03457701",
      "title": "Anemia Studies in CKD: Erythropoiesis Via a Novel Prolyl Hydroxylase Inhibitor (PHI) Daprodustat- Iron (ASCEND: Fe)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Anaemia"
      ],
      "interventions": [
        {
          "name": "Daprodustat",
          "type": "DRUG"
        },
        {
          "name": "rhEPO",
          "type": "DRUG"
        },
        {
          "name": "Ferrous sulfate containing the stable iron isotope (57Fe)",
          "type": "DRUG"
        },
        {
          "name": "Ferrous sulfate containing the stable iron isotope (58Fe)",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "GlaxoSmithKline",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 15,
      "start_date": "2019-07-30",
      "completion_date": "2022-07-05",
      "has_results": true,
      "last_update_posted_date": "2024-03-27",
      "last_synced_at": "2026-09-24T20:19:09.981Z",
      "location_count": 3,
      "location_summary": "Fort Worth, Texas • Lufkin, Texas • San Antonio, Texas",
      "locations": [
        {
          "city": "Fort Worth",
          "state": "Texas"
        },
        {
          "city": "Lufkin",
          "state": "Texas"
        },
        {
          "city": "San Antonio",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03457701"
    },
    {
      "nct_id": "NCT04253626",
      "title": "Comparison of Oral Ferrous Sulfate to Intravenous Ferumoxytol in Antepartum Iron Deficiency Anemia",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Pregnancy Related",
        "Anemia, Iron Deficiency"
      ],
      "interventions": [
        {
          "name": "Ferumoxytol Injection [Feraheme]",
          "type": "DRUG"
        },
        {
          "name": "Ferrous Sulfate",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Stanford University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "18 Years and older · Female only"
      },
      "enrollment_count": 83,
      "start_date": "2021-01-21",
      "completion_date": "2024-07-01",
      "has_results": true,
      "last_update_posted_date": "2026-06-30",
      "last_synced_at": "2026-09-24T20:19:09.981Z",
      "location_count": 1,
      "location_summary": "Stanford, California",
      "locations": [
        {
          "city": "Stanford",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04253626"
    }
  ]
}