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ClinicalTrials.gov public records Last synced Oct 19, 2026, 9:14 AM EDT

Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.

Showing 1–24 of 102 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Histamine Clear all
Completed Phase 1 Interventional Accepts healthy volunteers

Effects of Hallucinogens and Other Drugs on Mood and Performance

NCT02033707
View directory record Official record
Conditions
Healthy
Interventions
Hallucinogens and psychoactive substances
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
21 Years to 50 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2019
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated May 16, 2019 · Synced Oct 19, 2026, 9:14 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Evaluate the Effects of Famotidine or Rabeprazole on the PK of Nirogacestat

NCT07171619
View directory record Official record
Conditions
Healthy
Interventions
Nirogacestat, Nirogacestat and Famotidine, Nirogacestat and Rabeprazole
Drug
Lead sponsor
SpringWorks Therapeutics, Inc., a healthcare company of Merck KGaA, Darmstadt, Germany
Industry
Eligibility
18 Years to 55 Years · Male only
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated May 8, 2026 · Synced Oct 19, 2026, 9:14 AM EDT
Completed Phase 3 Interventional

Acute Otitis Media: Adjuvant Therapy to Improve Outcome

NCT00000363
View directory record Official record
Conditions
Otitis Media
Interventions
Antihistamine, Corticosteroid
Drug
Lead sponsor
National Institute on Deafness and Other Communication Disorders (NIDCD)
NIH
Eligibility
2 Months to 1 Year
Healthy volunteers
Healthy volunteers not accepted
Timeline
Ends 2001
U.S. locations
1
States / cities
Galveston, Texas
Source: ClinicalTrials.gov public record
Updated Apr 24, 2006 · Synced Oct 19, 2026, 9:14 AM EDT
Completed Phase 2 Interventional Results available

Study to Evaluate the Efficacy and Safety of GSK239512 in Schizophrenia

NCT01009060
View directory record Official record
Conditions
Schizophrenia
Interventions
GSK239512, Placebo
Drug
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
18 Years to 55 Years
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
15
States / cities
Garden Grove, California • Los Angeles, California • National City, California + 11 more
Source: ClinicalTrials.gov public record
Updated Nov 8, 2017 · Synced Oct 19, 2026, 9:14 AM EDT
Recruiting Phase 3 Interventional

Ketotifen for Children With Functional Dyspepsia in Association With Duodenal Eosinophilia

NCT02484248
View directory record Official record
Conditions
Functional Dyspepsia
Interventions
Ketotifen, Placebo
Drug
Lead sponsor
Craig A. Friesen, MD
Other
Eligibility
8 Years to 17 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2027
U.S. locations
1
States / cities
Kansas City, Missouri
Source: ClinicalTrials.gov public record
Updated Jan 9, 2026 · Synced Oct 19, 2026, 9:14 AM EDT
Active, not recruiting Phase 3 Interventional Results available

A Study to Evaluate the Efficacy, Safety and Pharmacokinetics (PK) of a Higher Dose of Ocrelizumab in Adults With Primary Progressive Multiple Sclerosis (PPMS)

NCT04548999
View directory record Official record
Conditions
Multiple Sclerosis
Interventions
Ocrelizumab, Antihistamine, Methylprednisolone
Drug
Lead sponsor
Hoffmann-La Roche
Industry
Eligibility
18 Years to 55 Years
Enrollment
769 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2027
U.S. locations
24
States / cities
Homewood, Alabama • Phoenix, Arizona • Irvine, California + 21 more
Source: ClinicalTrials.gov public record
Updated Jul 24, 2026 · Synced Oct 19, 2026, 9:14 AM EDT
Completed Phase 2 Interventional Results available

Personalized Treatment Algorithms for Difficult-to-treat Asthma

NCT04179461
View directory record Official record
Conditions
Asthma in Children
Interventions
Cholecalciferol, antihistamine, Azithromycin, emollient cream, Fluticasone Propionate, Asthma Controller Medication
Drug
Lead sponsor
Children's Hospital Medical Center, Cincinnati
Other
Eligibility
6 Years to 17 Years
Enrollment
21 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Aug 20, 2021 · Synced Oct 19, 2026, 9:14 AM EDT
Completed Phase 3 Interventional

A Histamine Pharmacodynamic Biomarker to Guide Treatment in Pediatric Asthma (HAS3)

NCT04699604
View directory record Official record
Conditions
Allergic Asthma
Interventions
Levocetirizine Dihydrochloride, Placebo
Drug
Lead sponsor
Bridgette Jones
Other
Eligibility
6 Years to 17 Years
Enrollment
55 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
1
States / cities
Kansas City, Missouri
Source: ClinicalTrials.gov public record
Updated Jul 1, 2026 · Synced Oct 19, 2026, 9:14 AM EDT
Completed Phase 1 Interventional

Effects of Betahistine Hydrochloride in Overweight Women

NCT00459992
View directory record Official record
Conditions
Obesity, Overweight, Overnutrition
Interventions
Betahistine Hydrochloride
Drug
Lead sponsor
Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
NIH
Eligibility
18 Years to 70 Years · Female only
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2011
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Dec 16, 2019 · Synced Oct 19, 2026, 9:14 AM EDT
Completed Phase 2 Interventional Results available

Histamine Glutamate Antagonism in Stroke

NCT02142712
View directory record Official record
Conditions
Acute Cerebrovascular Accident, Cerebral Edema
Interventions
Diphenhydramine, Pantoprazole, Famotidine, Dextromethorphan
Drug
Lead sponsor
University of Florida
Other
Eligibility
18 Years to 80 Years
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Dec 15, 2015 · Synced Oct 19, 2026, 9:14 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Evaluation of the Allergenicity of AMPHADASE INJECTION (Hyaluronidase Injection USP)

NCT01689363
View directory record Official record
Conditions
Allergic Skin Reaction
Interventions
Hyaluronidase, Histamine, Saline
Drug
Lead sponsor
Amphastar Pharmaceuticals, Inc.
Industry
Eligibility
18 Years to 80 Years
Enrollment
253 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012
U.S. locations
5
States / cities
Eugene, Oregon • Lake Oswego, Oregon • Portland, Oregon + 2 more
Source: ClinicalTrials.gov public record
Updated Jan 20, 2017 · Synced Oct 19, 2026, 9:14 AM EDT
Terminated No phase listed Observational

The Effect of Levocetirizine on Inflammatory Mediators in Dermatographism

NCT01008592
View directory record Official record
Conditions
Rhinitis, Urticaria
Interventions
levocetirizine or placebo
Drug
Lead sponsor
Wake Forest University
Other
Eligibility
18 Years to 60 Years
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Feb 28, 2017 · Synced Oct 19, 2026, 9:14 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Head-to-Head Comparison Study Between Different FDA Registered Allergy Skin Test Applicators

NCT07400718
View directory record Official record
Conditions
Allergy, Hypersensitivity, Immediate, Ig-E Mediated Food
Interventions
AllerTest-10 Multi-Head Skin Test Device, Skintestor OMNI Multi-Head Skin Test Device, Multi-Test II Multi-Head Skin Test Device, AllerTest-8 Multi-Head Skin Test Device
Device
Lead sponsor
QHSLab, Inc.
Industry
Eligibility
18 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Feb 12, 2026 · Synced Oct 19, 2026, 9:14 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Dietary Supplement With and Without a Probiotic

NCT04433208
View directory record Official record
Conditions
Healthy Adult Subjects
Interventions
Complex oligosaccharide, Probiotic, PPI, H2 Blocker
Dietary Supplement · Other
Lead sponsor
Prolacta Bioscience
Industry
Eligibility
18 Years to 44 Years
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
Cypress, California
Source: ClinicalTrials.gov public record
Updated Mar 18, 2025 · Synced Oct 19, 2026, 9:14 AM EDT
Not listed Phase 3 Interventional Accepts healthy volunteers

Safety and Efficacy Study of Bee Venom to Treat Knee Osteoarthritis

NCT00253942
View directory record Official record
Conditions
Persons With Mild to Moderate Knee Osteoarthritis
Interventions
Injecting bee venom as a treatment for OA
Procedure
Lead sponsor
Rheumatology Therapeutics Medical Center
Other
Eligibility
35 Years and older
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
Started 2005
U.S. locations
2
States / cities
Encino, California • Tarzana, California
Source: ClinicalTrials.gov public record
Updated Nov 15, 2005 · Synced Oct 19, 2026, 9:14 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

Evaluation of Histamine, CGRP and VIP as Markers for Activation of Trigeminal and Parasympathetic Nerve Fibers

NCT00208065
View directory record Official record
Conditions
Migraine, Sinusitis
Interventions
almotriptan or pseudoephedrine
Drug
Lead sponsor
Clinvest
Other
Eligibility
18 Years to 65 Years
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2005
U.S. locations
1
States / cities
Springfield, Missouri
Source: ClinicalTrials.gov public record
Updated May 6, 2009 · Synced Oct 19, 2026, 9:14 AM EDT
Terminated Phase 3 Interventional Results available

Long-Term Extension Study of Ofatumumab in Subjects With Pemphigus Vulgaris

NCT02613910
View directory record Official record
Conditions
Pemphigus
Interventions
Ofatumumab, Acetaminophen/paracetamol, Antihistamine (cetirizine or equivalent), Prednisone/Prednisolone
Drug
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
Not listed
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
2
States / cities
Los Angeles, California • Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Jun 14, 2017 · Synced Oct 19, 2026, 9:14 AM EDT
Active, not recruiting Phase 2 Interventional Results available

Randomized Phase II Trial of Rituximab With Either Pentostatin or Bendamustine for Multiply Relapsed or Refractory Hairy Cell Leukemia

NCT01059786
View directory record Official record
Conditions
Hairy Cell Leukemia
Interventions
Pentostatin, Rituximab, Bendamustine, Acetaminophen, Diphenhydramine, Epinephrine, Antihistamines, Corticosteroids, Bronchodilators, Intravenous (IV) Saline
Drug · Other
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
18 Years and older
Enrollment
69 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2031
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 15, 2026 · Synced Oct 19, 2026, 9:14 AM EDT
Completed Phase 2 Interventional

Apitox, Honeybee Venom Treatment for Osteoarthritis Pain and Inflammation

NCT00949754
View directory record Official record
Conditions
Osteoarthritis of the Knee
Interventions
honeybee venom (Apitoxin (Korea) Apitox (USA))
Drug
Lead sponsor
Apimeds, Inc.
Industry
Eligibility
35 Years to 85 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
4
States / cities
Pinellas Park, Florida • Chicago, Illinois • Columbus, Ohio + 1 more
Source: ClinicalTrials.gov public record
Updated May 5, 2010 · Synced Oct 19, 2026, 9:14 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Safety and Efficacy of Abatacept in Subjects With Chronic Urticaria Who Have Had an Inadequate Response to Anti-histamine Therapy

NCT00886795
View directory record Official record
Conditions
Urticaria
Interventions
abatacept (Orencia ®)
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years to 70 Years
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2013
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jan 25, 2016 · Synced Oct 19, 2026, 9:14 AM EDT
Not listed Phase 3 Interventional

Interleukin-2 With or Without Histamine Dihydrochloride in Treating Patients With Stage IV Melanoma Metastatic to the Liver

NCT00039234
View directory record Official record
Conditions
Melanoma (Skin), Metastatic Cancer
Interventions
aldesleukin, histamine dihydrochloride
Biological · Drug
Lead sponsor
Maxim Pharmaceuticals
Industry
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2002
U.S. locations
11
States / cities
Santa Monica, California • Aurora, Colorado • Tampa, Florida + 7 more
Source: ClinicalTrials.gov public record
Updated Dec 18, 2013 · Synced Oct 19, 2026, 9:14 AM EDT
Completed Phase 2 Interventional Results available

Repurposing a Histamine Antagonist to Benefit Patients With Pulmonary Hypertension

NCT03554291
View directory record Official record
Conditions
Pulmonary Arterial Hypertension, Right Heart Failure
Interventions
Famotidine 20 MG, Placebo
Drug · Other
Lead sponsor
University of Washington
Other
Eligibility
18 Years to 80 Years
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2023
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Aug 9, 2024 · Synced Oct 19, 2026, 9:14 AM EDT
Completed No phase listed Observational

Validation of Laser Doppler Flowmetry to Identify Allergic Rhinitis Patients With Pharmacogenetic Alterations in Histamine Metabolism

NCT00362999
View directory record Official record
Conditions
Allergic Rhinitis
Interventions
Not listed
Lead sponsor
Children's Mercy Hospital Kansas City
Other
Eligibility
7 Years to 18 Years
Enrollment
74 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2024
U.S. locations
1
States / cities
Kansas City, Missouri
Source: ClinicalTrials.gov public record
Updated Jul 3, 2024 · Synced Oct 19, 2026, 9:14 AM EDT
Terminated Phase 3 Interventional Results available

Treatment of Long CoronaVirus Disease (COVID) (TLC) Feasibility Trial

NCT05946551
View directory record Official record
Conditions
COVID-19
Interventions
Cetirizine, Famotidine, Cetirizine Placebo, Famotidine Placebo
Drug
Lead sponsor
Emory University
Other
Eligibility
18 Years and older
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024
U.S. locations
4
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Jul 17, 2025 · Synced Oct 19, 2026, 9:14 AM EDT