{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Placebo+Comparator+Challenge",
    "query": {
      "intervention": "Placebo Comparator Challenge"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 267,
    "total_pages": 27,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Placebo+Comparator+Challenge&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-11T19:05:24.538Z",
  "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": "NCT01589068",
      "title": "Effects of Progesterone on IV Nicotine Induced Changes on BOLD fMRI Signal, Hormones and Subjective Ratings of Stimulant Drugs",
      "overall_status": "WITHDRAWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Nicotine Dependence"
      ],
      "interventions": [
        {
          "name": "Intravenous Nicotine",
          "type": "DRUG"
        },
        {
          "name": "Progesterone",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Mclean Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "40 Years",
        "sex": "ALL",
        "summary": "18 Years to 40 Years"
      },
      "enrollment_count": 0,
      "start_date": "2007-01",
      "completion_date": "2015-12-01",
      "has_results": false,
      "last_update_posted_date": "2024-01-17",
      "last_synced_at": "2026-09-11T19:05:24.538Z",
      "location_count": 1,
      "location_summary": "Belmont, Massachusetts",
      "locations": [
        {
          "city": "Belmont",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01589068"
    },
    {
      "nct_id": "NCT00244543",
      "title": "Evaluation of Efficacy of Ophthalmic Solution in Induced Allergic Conjunctivitis",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Allergic Conjunctivitis"
      ],
      "interventions": [
        {
          "name": "R89674 (generic name not yet established)",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Vistakon Pharmaceuticals",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "10 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "10 Years and older"
      },
      "enrollment_count": 110,
      "start_date": "2005-10",
      "completion_date": null,
      "has_results": false,
      "last_update_posted_date": "2011-09-27",
      "last_synced_at": "2026-09-11T19:05:24.538Z",
      "location_count": 1,
      "location_summary": "North Andover, Massachusetts",
      "locations": [
        {
          "city": "North Andover",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00244543"
    },
    {
      "nct_id": "NCT01730872",
      "title": "Evaluation of Prednisolone in a Modified Conjunctival Allergen Challenge Model",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Chronic Allergic Conjunctivitis"
      ],
      "interventions": [
        {
          "name": "Prednisolone Sodium Phosphate Ophthalmic Solution 1%",
          "type": "DRUG"
        },
        {
          "name": "Tears Naturale II Ophthalmic Solution",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "ORA, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 16,
      "start_date": "2012-11",
      "completion_date": "2012-12",
      "has_results": true,
      "last_update_posted_date": "2019-06-19",
      "last_synced_at": "2026-09-11T19:05:24.538Z",
      "location_count": 1,
      "location_summary": "Andover, Massachusetts",
      "locations": [
        {
          "city": "Andover",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01730872"
    },
    {
      "nct_id": "NCT02067975",
      "title": "Tryptophan MRI in People With Schizophrenia and Healthy Controls",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2",
        "PHASE3"
      ],
      "conditions": [
        "Schizophrenia"
      ],
      "interventions": [
        {
          "name": "Tryptophan",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of Maryland, Baltimore",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "55 Years",
        "sex": "ALL",
        "summary": "18 Years to 55 Years"
      },
      "enrollment_count": 93,
      "start_date": "2014-08-14",
      "completion_date": "2019-12-31",
      "has_results": true,
      "last_update_posted_date": "2024-07-30",
      "last_synced_at": "2026-09-11T19:05:24.538Z",
      "location_count": 1,
      "location_summary": "Catonsville, Maryland",
      "locations": [
        {
          "city": "Catonsville",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02067975"
    },
    {
      "nct_id": "NCT02542605",
      "title": "To Evaluate the Blockade of CGRP in Preventing PACAP-38 Induced Migraine-like Attacks With AMG 334 in Migraine Patients",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Migraine"
      ],
      "interventions": [
        {
          "name": "Erenumab",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        },
        {
          "name": "PACAP-38 Challenge Agent",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Amgen",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "45 Years",
        "sex": "ALL",
        "summary": "18 Years to 45 Years"
      },
      "enrollment_count": 35,
      "start_date": "2015-11-11",
      "completion_date": "2017-11-08",
      "has_results": true,
      "last_update_posted_date": "2019-06-03",
      "last_synced_at": "2026-09-11T19:05:24.538Z",
      "location_count": 1,
      "location_summary": "Anaheim, California",
      "locations": [
        {
          "city": "Anaheim",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02542605"
    },
    {
      "nct_id": "NCT01546753",
      "title": "Walnut Oral Immunotherapy for Tree Nut Allergy",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1",
        "PHASE2"
      ],
      "conditions": [
        "Tree Nut Allergy"
      ],
      "interventions": [
        {
          "name": "Walnut Protein Powder",
          "type": "DRUG"
        },
        {
          "name": "Oat Powder (placebo)",
          "type": "DRUG"
        },
        {
          "name": "Open-label Walnut Protein Powder",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of Arkansas",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "6 Years",
        "maximum_age": "45 Years",
        "sex": "ALL",
        "summary": "6 Years to 45 Years"
      },
      "enrollment_count": 22,
      "start_date": "2012-04-27",
      "completion_date": "2020-07-02",
      "has_results": true,
      "last_update_posted_date": "2023-05-12",
      "last_synced_at": "2026-09-11T19:05:24.538Z",
      "location_count": 1,
      "location_summary": "Little Rock, Arkansas",
      "locations": [
        {
          "city": "Little Rock",
          "state": "Arkansas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01546753"
    },
    {
      "nct_id": "NCT00256451",
      "title": "Endophenotype for Alcohol Misuse in Healthy Minority Populations",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Healthy"
      ],
      "interventions": [
        {
          "name": "Naltrexone",
          "type": "DRUG"
        },
        {
          "name": "placebo",
          "type": "DRUG"
        },
        {
          "name": "alcohol",
          "type": "OTHER"
        },
        {
          "name": "Sham alcohol",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "University of Pennsylvania",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "21 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "21 Years and older"
      },
      "enrollment_count": 43,
      "start_date": "2005-11",
      "completion_date": "2008-05",
      "has_results": true,
      "last_update_posted_date": "2019-08-21",
      "last_synced_at": "2026-09-11T19:05:24.538Z",
      "location_count": 1,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00256451"
    },
    {
      "nct_id": "NCT01296672",
      "title": "3 Month Finasteride Challenge Test Can Significantly Improve the Performance of Screening for Prostate Cancer",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Prostate Cancer"
      ],
      "interventions": [
        {
          "name": "Finasteride",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "The University of Texas Health Science Center at San Antonio",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "55 Years",
        "maximum_age": null,
        "sex": "MALE",
        "summary": "55 Years and older · Male only"
      },
      "enrollment_count": 383,
      "start_date": "2011-02",
      "completion_date": "2017-01",
      "has_results": true,
      "last_update_posted_date": "2017-10-06",
      "last_synced_at": "2026-09-11T19:05:24.538Z",
      "location_count": 1,
      "location_summary": "San Antonio, Texas",
      "locations": [
        {
          "city": "San Antonio",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01296672"
    },
    {
      "nct_id": "NCT04622345",
      "title": "Safety and Efficacy of VSJ-110 in the Treatment of Allergic Conjunctivitis in Adults With a History of Ocular Allergies",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Allergic Conjunctivitis"
      ],
      "interventions": [
        {
          "name": "VSJ-110",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Vanda Pharmaceuticals",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 47,
      "start_date": "2020-11-21",
      "completion_date": "2021-06-28",
      "has_results": true,
      "last_update_posted_date": "2025-09-11",
      "last_synced_at": "2026-09-11T19:05:24.538Z",
      "location_count": 1,
      "location_summary": "Andover, Massachusetts",
      "locations": [
        {
          "city": "Andover",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04622345"
    },
    {
      "nct_id": "NCT06334419",
      "title": "Placebo-Controlled, Single-Dose Challenge Study of Gaboxadol in Adult Males With Fragile X Syndrome (FXS)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Fragile X Syndrome"
      ],
      "interventions": [
        {
          "name": "Gaboxadol",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Craig Erickson",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "40 Years",
        "sex": "MALE",
        "summary": "18 Years to 40 Years · Male only"
      },
      "enrollment_count": 10,
      "start_date": "2024-01-29",
      "completion_date": "2025-06-24",
      "has_results": false,
      "last_update_posted_date": "2025-12-23",
      "last_synced_at": "2026-09-11T19:05:24.538Z",
      "location_count": 1,
      "location_summary": "Cincinnati, Ohio",
      "locations": [
        {
          "city": "Cincinnati",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06334419"
    }
  ]
}