{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Hydroxyzine+HCL&page=2",
    "query": {
      "intervention": "Hydroxyzine HCL",
      "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=Hydroxyzine+HCL&page=1&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-09-24T13:01:01.572Z",
  "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": "NCT01825655",
      "title": "Study of Using Long Acting Antihistamine to Treat Opioid Induced Itching",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Pruritus"
      ],
      "interventions": [
        {
          "name": "Cetirizine",
          "type": "DRUG"
        },
        {
          "name": "Placebo or sugar pill",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Virginia Commonwealth University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "6 Years",
        "maximum_age": "18 Years",
        "sex": "ALL",
        "summary": "6 Years to 18 Years"
      },
      "enrollment_count": 3,
      "start_date": "2014-09",
      "completion_date": "2017-11",
      "has_results": true,
      "last_update_posted_date": "2018-10-10",
      "last_synced_at": "2026-09-24T13:01:01.572Z",
      "location_count": 1,
      "location_summary": "Richmond, Virginia",
      "locations": [
        {
          "city": "Richmond",
          "state": "Virginia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01825655"
    },
    {
      "nct_id": "NCT05946551",
      "title": "Treatment of Long CoronaVirus Disease (COVID) (TLC) Feasibility Trial",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "COVID-19"
      ],
      "interventions": [
        {
          "name": "Cetirizine",
          "type": "DRUG"
        },
        {
          "name": "Famotidine",
          "type": "DRUG"
        },
        {
          "name": "Cetirizine Placebo",
          "type": "DRUG"
        },
        {
          "name": "Famotidine Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Emory University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 5,
      "start_date": "2024-03-08",
      "completion_date": "2024-06-24",
      "has_results": true,
      "last_update_posted_date": "2025-07-17",
      "last_synced_at": "2026-09-24T13:01:01.572Z",
      "location_count": 4,
      "location_summary": "Atlanta, Georgia",
      "locations": [
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05946551"
    },
    {
      "nct_id": "NCT02543346",
      "title": "Comparability and Standardization of Controlled Allergen Challenge Facilities",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Allergic Rhinitis"
      ],
      "interventions": [
        {
          "name": "Cetirizine",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "Queen's University",
      "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": 98,
      "start_date": "2015-10",
      "completion_date": "2016-05",
      "has_results": true,
      "last_update_posted_date": "2019-04-09",
      "last_synced_at": "2026-09-24T13:01:01.572Z",
      "location_count": 1,
      "location_summary": "San Antonio, Texas",
      "locations": [
        {
          "city": "San Antonio",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02543346"
    },
    {
      "nct_id": "NCT04580134",
      "title": "CLOZAPINE Response in Biotype-1",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Schizophrenia",
        "Schizoaffective Disorder",
        "Bipolar 1 Disorder"
      ],
      "interventions": [
        {
          "name": "clozapine",
          "type": "DRUG"
        },
        {
          "name": "risperidone",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of Texas Southwestern Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "60 Years",
        "sex": "ALL",
        "summary": "18 Years to 60 Years"
      },
      "enrollment_count": 524,
      "start_date": "2022-03-01",
      "completion_date": "2027-04-30",
      "has_results": false,
      "last_update_posted_date": "2026-05-11",
      "last_synced_at": "2026-09-24T13:01:01.572Z",
      "location_count": 5,
      "location_summary": "Hartford, Connecticut • Athens, Georgia • Chicago, Illinois + 2 more",
      "locations": [
        {
          "city": "Hartford",
          "state": "Connecticut"
        },
        {
          "city": "Athens",
          "state": "Georgia"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        },
        {
          "city": "Dallas",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04580134"
    },
    {
      "nct_id": "NCT01781507",
      "title": "Study of Bronchodilation Effects of Cetirizine",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Allergic Rhinitis",
        "Asthma"
      ],
      "interventions": [
        {
          "name": "Cetirizine",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "California Allergy and Asthma Medical Group, Inc.",
      "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": 21,
      "start_date": "2011-06",
      "completion_date": "2011-12",
      "has_results": false,
      "last_update_posted_date": "2013-09-04",
      "last_synced_at": "2026-09-24T13:01:01.572Z",
      "location_count": 1,
      "location_summary": "Los Angeles, California",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01781507"
    },
    {
      "nct_id": "NCT04189588",
      "title": "Phase 2 Study IV QUZYTTIR™ (Cetirizine Hydrochloride Injection) vs V Diphenhydramine",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Oncology Patients Receiving Chemotherapy"
      ],
      "interventions": [
        {
          "name": "Cetirizine HCl 10 mg/mL",
          "type": "DRUG"
        },
        {
          "name": "Diphenhydramine 50 mg/mL",
          "type": "DRUG"
        },
        {
          "name": "anti-CD20 such as Rituximab or Paclitaxel",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "TerSera Therapeutics LLC",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 34,
      "start_date": "2020-03-25",
      "completion_date": "2020-12-23",
      "has_results": true,
      "last_update_posted_date": "2023-10-06",
      "last_synced_at": "2026-09-24T13:01:01.572Z",
      "location_count": 7,
      "location_summary": "Napa, California • Rancho Mirage, California • Santa Rosa, California + 4 more",
      "locations": [
        {
          "city": "Napa",
          "state": "California"
        },
        {
          "city": "Rancho Mirage",
          "state": "California"
        },
        {
          "city": "Santa Rosa",
          "state": "California"
        },
        {
          "city": "Houston",
          "state": "Texas"
        },
        {
          "city": "Round Rock",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04189588"
    },
    {
      "nct_id": "NCT02613910",
      "title": "Long-Term Extension Study of Ofatumumab in Subjects With Pemphigus Vulgaris",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Pemphigus"
      ],
      "interventions": [
        {
          "name": "Ofatumumab",
          "type": "DRUG"
        },
        {
          "name": "Acetaminophen/paracetamol",
          "type": "DRUG"
        },
        {
          "name": "Antihistamine (cetirizine or equivalent)",
          "type": "DRUG"
        },
        {
          "name": "Prednisone/Prednisolone",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "GlaxoSmithKline",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 1,
      "start_date": "2015-12-23",
      "completion_date": "2016-03-23",
      "has_results": true,
      "last_update_posted_date": "2017-06-14",
      "last_synced_at": "2026-09-24T13:01:01.572Z",
      "location_count": 2,
      "location_summary": "Los Angeles, California • Ann Arbor, Michigan",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Ann Arbor",
          "state": "Michigan"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02613910"
    },
    {
      "nct_id": "NCT01241214",
      "title": "Study of ACT-129968 in Adult Patients With Seasonal Allergic Rhinitis",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Seasonal Allergic Rhinitis"
      ],
      "interventions": [
        {
          "name": "ACT-129968",
          "type": "DRUG"
        },
        {
          "name": "Cetirizine",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Idorsia Pharmaceuticals Ltd.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "70 Years",
        "sex": "ALL",
        "summary": "18 Years to 70 Years"
      },
      "enrollment_count": 579,
      "start_date": "2010-11",
      "completion_date": "2011-02",
      "has_results": false,
      "last_update_posted_date": "2019-05-15",
      "last_synced_at": "2026-09-24T13:01:01.572Z",
      "location_count": 7,
      "location_summary": "Austin, Texas • Kerrville, Texas • New Braunfels, Texas + 1 more",
      "locations": [
        {
          "city": "Austin",
          "state": "Texas"
        },
        {
          "city": "Kerrville",
          "state": "Texas"
        },
        {
          "city": "New Braunfels",
          "state": "Texas"
        },
        {
          "city": "San Antonio",
          "state": "Texas"
        },
        {
          "city": "San Antonio",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01241214"
    },
    {
      "nct_id": "NCT00260481",
      "title": "Prometa Pharmacotherapy for Methamphetamine Dependence",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2",
        "PHASE3"
      ],
      "conditions": [
        "Drug Abuse",
        "Drug Dependence"
      ],
      "interventions": [
        {
          "name": "Prometa",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of California, Los Angeles",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 120,
      "start_date": "2006-01",
      "completion_date": "2008-06",
      "has_results": false,
      "last_update_posted_date": "2016-01-22",
      "last_synced_at": "2026-09-24T13:01:01.572Z",
      "location_count": 1,
      "location_summary": "Los Angeles, California",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00260481"
    },
    {
      "nct_id": "NCT00650065",
      "title": "Fasting Study of Cetirizine HCl Tablets 10 mg and Zyrtec® Tablets 10 mg",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Healthy"
      ],
      "interventions": [
        {
          "name": "Cetirizine HCl Tablets 10 mg",
          "type": "DRUG"
        },
        {
          "name": "Zyrtec® Tablets 10 mg",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Mylan Pharmaceuticals Inc",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 26,
      "start_date": "2002-11",
      "completion_date": "2002-12",
      "has_results": false,
      "last_update_posted_date": "2024-04-24",
      "last_synced_at": "2026-09-24T13:01:01.572Z",
      "location_count": 1,
      "location_summary": "Houston, Texas",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00650065"
    }
  ]
}