{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=PF-06651600+alone",
    "query": {
      "intervention": "PF-06651600 alone"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 16,
    "total_pages": 2,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=PF-06651600+alone&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-12T01:34:34.231Z",
  "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": "NCT02974868",
      "title": "Study To Evaluate The Efficacy And Safety Profile Of PF-06651600 And PF-06700841 In Subjects With Alopecia Areata",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Alopecia Areata"
      ],
      "interventions": [
        {
          "name": "PF-06651600",
          "type": "DRUG"
        },
        {
          "name": "PF-06700841",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Pfizer",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "18 Years to 75 Years"
      },
      "enrollment_count": 142,
      "start_date": "2016-12-15",
      "completion_date": "2019-05-15",
      "has_results": true,
      "last_update_posted_date": "2020-05-26",
      "last_synced_at": "2026-09-12T01:34:34.231Z",
      "location_count": 39,
      "location_summary": "Birmingham, Alabama • Santa Ana, California • Santa Monica, California + 15 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Santa Ana",
          "state": "California"
        },
        {
          "city": "Santa Monica",
          "state": "California"
        },
        {
          "city": "Santa Monica",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02974868"
    },
    {
      "nct_id": "NCT04018274",
      "title": "Effect of PF-06651600 on the Pharmacokinetics of Oral Contraceptive Steroids",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Healthy"
      ],
      "interventions": [
        {
          "name": "PF-06651600",
          "type": "DRUG"
        },
        {
          "name": "Ethinyl estradiol (EE) and levonorgestrel(LN)",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Pfizer",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "60 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 60 Years · Female only"
      },
      "enrollment_count": 29,
      "start_date": "2019-08-09",
      "completion_date": "2019-10-16",
      "has_results": false,
      "last_update_posted_date": "2019-11-15",
      "last_synced_at": "2026-09-12T01:34:34.231Z",
      "location_count": 2,
      "location_summary": "Coral Gables, Florida • Miami, Florida",
      "locations": [
        {
          "city": "Coral Gables",
          "state": "Florida"
        },
        {
          "city": "Miami",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04018274"
    },
    {
      "nct_id": "NCT06369454",
      "title": "A Study to Learn About How Different Forms of the Study Medicine Called Ritlecitinib Pass the Intestines of Healthy Male Adults When Taken With or Without Food",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Healthy Volunteers"
      ],
      "interventions": [
        {
          "name": "Ritlecitinib",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Pfizer",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "MALE",
        "summary": "18 Years and older · Male only"
      },
      "enrollment_count": 12,
      "start_date": "2024-05-03",
      "completion_date": "2024-07-31",
      "has_results": false,
      "last_update_posted_date": "2024-08-28",
      "last_synced_at": "2026-09-12T01:34:34.231Z",
      "location_count": 1,
      "location_summary": "Lexington, Kentucky",
      "locations": [
        {
          "city": "Lexington",
          "state": "Kentucky"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06369454"
    },
    {
      "nct_id": "NCT04655040",
      "title": "Estimation of the Effect of Multiple Dose Ritlecitinib (PF-06651600) on the Pharmacokinetics of a Single Dose of Caffeine in Healthy Participants",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Healthy Participants"
      ],
      "interventions": [
        {
          "name": "Caffeine",
          "type": "DRUG"
        },
        {
          "name": "Ritlecitinib",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "Pfizer",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "55 Years",
        "sex": "ALL",
        "summary": "18 Years to 55 Years"
      },
      "enrollment_count": 12,
      "start_date": "2020-12-18",
      "completion_date": "2021-03-05",
      "has_results": false,
      "last_update_posted_date": "2021-03-18",
      "last_synced_at": "2026-09-12T01:34:34.231Z",
      "location_count": 1,
      "location_summary": "New Haven, Connecticut",
      "locations": [
        {
          "city": "New Haven",
          "state": "Connecticut"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04655040"
    },
    {
      "nct_id": "NCT03608241",
      "title": "A STUDY TO ESTIMATE THE EFFECT OF PF-06651600 ON THE PHARMACOKINETICS (PK) OF ORAL CONTRACEPTIVE (OC)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Healthy Females"
      ],
      "interventions": [
        {
          "name": "PF-06651600",
          "type": "DRUG"
        },
        {
          "name": "Ethinyl estradiol (EE) and levonogestrel (LN)",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Pfizer",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "55 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 55 Years · Female only"
      },
      "enrollment_count": 12,
      "start_date": "2018-09-21",
      "completion_date": "2018-11-23",
      "has_results": false,
      "last_update_posted_date": "2019-04-09",
      "last_synced_at": "2026-09-12T01:34:34.231Z",
      "location_count": 2,
      "location_summary": "Coral Gables, Florida • Miami, Florida",
      "locations": [
        {
          "city": "Coral Gables",
          "state": "Florida"
        },
        {
          "city": "Miami",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03608241"
    },
    {
      "nct_id": "NCT03827668",
      "title": "A DRUG-DRUG INTERACTION STUDY BETWEEN PF-06650833 AND PF-06651600 FOLLOWING MULTIPLE DOSES IN HEALTHY PARTICIPANTS",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Healthy"
      ],
      "interventions": [
        {
          "name": "PF-06650833 alone",
          "type": "DRUG"
        },
        {
          "name": "PF-06651600 alone",
          "type": "DRUG"
        },
        {
          "name": "PF-06650833 together with PF-06651600",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Pfizer",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "55 Years",
        "sex": "ALL",
        "summary": "18 Years to 55 Years"
      },
      "enrollment_count": 15,
      "start_date": "2019-02-07",
      "completion_date": "2019-04-29",
      "has_results": false,
      "last_update_posted_date": "2020-05-20",
      "last_synced_at": "2026-09-12T01:34:34.231Z",
      "location_count": 1,
      "location_summary": "New Haven, Connecticut",
      "locations": [
        {
          "city": "New Haven",
          "state": "Connecticut"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03827668"
    },
    {
      "nct_id": "NCT04390776",
      "title": "Bioequivalence Study of PF-06651600 Capsules Relative to Tablets and Estimation of Food Effect on Capsules.",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Healthy Participants"
      ],
      "interventions": [
        {
          "name": "PF-06651600",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Pfizer",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "55 Years",
        "sex": "ALL",
        "summary": "18 Years to 55 Years"
      },
      "enrollment_count": 164,
      "start_date": "2020-09-28",
      "completion_date": "2021-07-19",
      "has_results": false,
      "last_update_posted_date": "2021-08-04",
      "last_synced_at": "2026-09-12T01:34:34.231Z",
      "location_count": 2,
      "location_summary": "Hollywood, Florida • Saint Paul, Minnesota",
      "locations": [
        {
          "city": "Hollywood",
          "state": "Florida"
        },
        {
          "city": "Saint Paul",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04390776"
    },
    {
      "nct_id": "NCT04355845",
      "title": "A STUDY TO EVALUATE THE EFFECT OF PF-06651600 ON PHARMACOKINETICS OF SINGLE DOSE SUMATRIPTAN IN HEALTHY PARTICIPANTS.",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Healthy Volunteers"
      ],
      "interventions": [
        {
          "name": "Sumatriptan",
          "type": "DRUG"
        },
        {
          "name": "PF-06651600",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Pfizer",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "55 Years",
        "sex": "ALL",
        "summary": "18 Years to 55 Years"
      },
      "enrollment_count": 10,
      "start_date": "2020-06-15",
      "completion_date": "2020-08-10",
      "has_results": false,
      "last_update_posted_date": "2020-09-03",
      "last_synced_at": "2026-09-12T01:34:34.231Z",
      "location_count": 1,
      "location_summary": "New Haven, Connecticut",
      "locations": [
        {
          "city": "New Haven",
          "state": "Connecticut"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04355845"
    },
    {
      "nct_id": "NCT06795373",
      "title": "Ritlecitinib (PF-06651600) in Participants With Chronic Spontaneous Urticaria",
      "overall_status": "WITHDRAWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Chronic Spontaneous Urticaria",
        "CSU"
      ],
      "interventions": [
        {
          "name": "Ritlecitinib",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Ahuva D Cices",
      "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": 0,
      "start_date": "2025-12-31",
      "completion_date": "2026-03-31",
      "has_results": false,
      "last_update_posted_date": "2025-12-09",
      "last_synced_at": "2026-09-12T01:34:34.231Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06795373"
    },
    {
      "nct_id": "NCT05879458",
      "title": "Ritlecitinib in CTCL",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "CTCL",
        "Mycosis Fungoides",
        "Sezary Syndrome"
      ],
      "interventions": [
        {
          "name": "Ritlecitinib",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Icahn School of Medicine at Mount Sinai",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 7,
      "start_date": "2023-05-17",
      "completion_date": "2025-06-25",
      "has_results": false,
      "last_update_posted_date": "2025-07-18",
      "last_synced_at": "2026-09-12T01:34:34.231Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05879458"
    }
  ]
}