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Showing 1–24 of 63 matching trials from the live ClinicalTrials.gov search.
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Recruiting Phase 4 Interventional

CLOZAPINE Response in Biotype-1

NCT04580134
View directory record Official record
Conditions
Schizophrenia, Schizoaffective Disorder, Bipolar 1 Disorder
Interventions
clozapine, risperidone
Drug
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
18 Years to 60 Years
Enrollment
524 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2027
U.S. locations
5
States / cities
Hartford, Connecticut • Athens, Georgia • Chicago, Illinois + 2 more
Source: ClinicalTrials.gov public record
Updated May 10, 2026 · Synced Sep 8, 2026, 8:02 AM EDT
Terminated Phase 4 Interventional

Clozapine Versus Chlorpromazine for Treatment-Unresponsive Schizophrenia

NCT00169039
View directory record Official record
Conditions
Schizophrenia
Interventions
Clozapine, Chlorpromazine
Drug
Lead sponsor
Harvard Medical School (HMS and HSDM)
Other
Eligibility
19 Years to 60 Years
Enrollment
66 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1994 – 2002
U.S. locations
1
States / cities
Jamaica Plain, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 6, 2015 · Synced Sep 8, 2026, 8:02 AM EDT
Completed Phase 4 Interventional

A Placebo-Controlled Trial of Modafinil (Provigil) Added to Clozapine in Patients With Schizophrenia

NCT00573417
View directory record Official record
Conditions
Schizophrenia
Interventions
modafinil, Placebo
Drug
Lead sponsor
North Suffolk Mental Health Association
Other
Eligibility
18 Years to 65 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2007
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 11, 2009 · Synced Sep 8, 2026, 8:02 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

A Safety, Tolerability, and Pharmacokinetics Study of MK-8189 in Participants With Schizophrenia and in Healthy Participants (MK-8189-007)

NCT03565068
View directory record Official record
Conditions
Schizophrenia
Interventions
MK-8189, Placebo, Background AAP Therapy
Drug
Lead sponsor
Merck Sharp & Dohme LLC
Industry
Eligibility
18 Years to 60 Years
Enrollment
75 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2020
U.S. locations
1
States / cities
Glendale, California
Source: ClinicalTrials.gov public record
Updated Mar 28, 2021 · Synced Sep 8, 2026, 8:02 AM EDT
Completed Not applicable Interventional

A Study of Strategies to Improve Schizophrenia Treatment

NCT00156637
View directory record Official record
Conditions
Schizophrenia, Schizoaffective Disorder
Interventions
Team-Based Quality Improvement Intervention, Opinion Leader Intervention, Team Based Quality Improvement
Behavioral
Lead sponsor
US Department of Veterans Affairs
Federal
Eligibility
18 Years to 65 Years
Enrollment
106 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2008
U.S. locations
4
States / cities
Fayetteville, Arkansas • No. Little Rock, Arkansas • Dayton, Ohio + 1 more
Source: ClinicalTrials.gov public record
Updated Apr 6, 2015 · Synced Sep 8, 2026, 8:02 AM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

National Pregnancy Registry for Psychiatric Medications

NCT01246765
View directory record Official record
Conditions
Pregnant Women, Psychotropic Drugs
Interventions
Not listed
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
5,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2033
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Oct 23, 2025 · Synced Sep 8, 2026, 8:02 AM EDT
Completed No phase listed Observational

Pharmacokinetics of Understudied Drugs Administered to Children Per Standard of Care

NCT01431326
View directory record Official record
Conditions
Adenovirus, Anesthesia, Anxiety, Anxiolysis, Autism, Autistic Disorder, Bacterial Meningitis, Bacterial Septicemia, Benzodiazepine, Bipolar Disorder, Bone and Joint Infections, Central Nervous System Infections, Convulsions, Cytomegalovirus Retinitis, Early-onset Schizophrenia Spectrum Disorders, Epilepsy, General Anesthesia, Gynecologic Infections, Herpes Simplex Virus, Infantile Hemangioma, Infection, Inflammation, Inflammatory Conditions, Intra-abdominal Infections, Lower Respiratory Tract Infections, Migraines, Pain, Pneumonia, Schizophrenia, Sedation, Seizures, Skeletal Muscle Spasms, Skin and Skin-structure Infections, Treatment-resistant Schizophrenia, Urinary Tract Infections, Withdrawal, Sepsis, Gram-negative Infection, Bradycardia, Cardiac Arrest, Cardiac Arrhythmia, Staphylococcal Infections, Nosocomial Pneumonia, Neuromuscular Blockade, Methicillin Resistant Staphylococcus Aureus, Endocarditis, Neutropenia, Headache, Fibrinolytic Bleeding, Pulmonary Arterial Hypertension, CMV Retinitis, Hypertension, Chronic Kidney Diseases, Hyperaldosteronism, Hypokalemia, Heart Failure, Hemophilia, Heavy Menstrual Bleeding, Insomnia
Interventions
The POPS study is collecting PK data on children prescribed the following drugs of interest per standard of care:
Drug
Lead sponsor
Daniel Benjamin
Other
Eligibility
Up to 21 Years
Enrollment
3,520 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2019
U.S. locations
43
States / cities
Anchorage, Alaska • Little Rock, Arkansas • La Jolla, California + 37 more
Source: ClinicalTrials.gov public record
Updated Sep 5, 2023 · Synced Sep 8, 2026, 8:02 AM EDT
Completed Phase 4 Interventional

Equivalence of Generic Clozapine to Orally Dissolving Clozapine in Schizophrenia or Schizoaffective Disorder

NCT00501618
View directory record Official record
Conditions
Schizophrenia, Schizoaffective Disorder
Interventions
Fazaclo
Drug
Lead sponsor
Manhattan Psychiatric Center
Other
Eligibility
18 Years to 59 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2009
U.S. locations
2
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Apr 14, 2015 · Synced Sep 8, 2026, 8:02 AM EDT
Recruiting Phase 4 Interventional

Biomarkers to Enhance Early Schizophrenia Treatment

NCT06969755
View directory record Official record
Conditions
Schizophenia Disorder
Interventions
aripiprazole, risperidone, clozapine
Drug
Lead sponsor
Northwell Health
Other
Eligibility
18 Years to 35 Years
Enrollment
180 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2030
U.S. locations
4
States / cities
Birmingham, Alabama • La Jolla, California • Belmont, Massachusetts + 1 more
Source: ClinicalTrials.gov public record
Updated Jul 30, 2026 · Synced Sep 8, 2026, 8:02 AM EDT
Completed Phase 3 Interventional

Atypical Neuroleptic Drugs in People With Mental Retardation/Developmental Delay

NCT00065273
View directory record Official record
Conditions
Mental Retardation, Developmental Delay Disorder
Interventions
risperidone, clozapine, olanzapine
Drug
Lead sponsor
Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
NIH
Eligibility
6 Years to 60 Years
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1998 – 2001
U.S. locations
1
States / cities
Lawrence, Kansas
Source: ClinicalTrials.gov public record
Updated Jun 23, 2005 · Synced Sep 8, 2026, 8:02 AM EDT
Completed Phase 4 Interventional

Evaluation of Clonazepam and Paroxetine for Panic Disorder With Depression

NCT00031317
View directory record Official record
Conditions
Panic Disorder
Interventions
Paroxetine, Clozapine
Drug
Lead sponsor
National Institute of Mental Health (NIMH)
NIH
Eligibility
Not listed
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2005
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2008 · Synced Sep 8, 2026, 8:02 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Improving Outcome in Schizophrenia Through Identification of Genetic Risk Factors

NCT00178932
View directory record Official record
Conditions
Schizophrenia, Schizoaffective Disorder, Bipolar Disorder, Major Depression
Interventions
genetic analysis, genetic assay
Procedure
Lead sponsor
Northwestern University
Other
Eligibility
18 Years to 65 Years
Enrollment
37 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1998 – 2024
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Mar 17, 2025 · Synced Sep 8, 2026, 8:02 AM EDT
Completed No phase listed Observational

A Study to Assess Stroke Risk Among Users of Typical Versus Atypical Antipsychotics Stratified by Broad Age Group

NCT04002700
View directory record Official record
Conditions
Stroke
Interventions
Haloperidol, Typical Antipsychotics, Atypical Antipsychotics
Drug
Lead sponsor
Janssen Research & Development, LLC
Industry
Eligibility
18 Years and older
Enrollment
1,234,412 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019
U.S. locations
1
States / cities
Titusville, New Jersey
Source: ClinicalTrials.gov public record
Updated Jun 24, 2025 · Synced Sep 8, 2026, 8:02 AM EDT
Completed Phase 4 Interventional Results available

Effectiveness of Aripiprazole for Improving Side Effects of Clozapine in the Treatment of People With Schizophrenia

NCT00345033
View directory record Official record
Conditions
Schizophrenia, Insulin Resistance
Interventions
Aripiprazole, Placebo
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 65 Years
Enrollment
38 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2010
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 22, 2014 · Synced Sep 8, 2026, 8:02 AM EDT
Completed Not applicable Interventional Results available

Adjunctive Minocycline in Clozapine Treated Schizophrenia Patients

NCT01433055
View directory record Official record
Conditions
Schizophrenia
Interventions
Minocycline, Placebo
Drug
Lead sponsor
University of Maryland, Baltimore
Other
Eligibility
18 Years to 65 Years
Enrollment
52 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
1
States / cities
Catonsville, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 27, 2019 · Synced Sep 8, 2026, 8:02 AM EDT
Recruiting Phase 4 Interventional

Clozapine for the Prevention of Violence in Schizophrenia: a Randomized Clinical Trial

NCT05208190
View directory record Official record
Conditions
Schizophrenia, Schizoaffective Disorder
Interventions
Clozapine, treatment as usual
Drug
Lead sponsor
New York State Psychiatric Institute
Other
Eligibility
18 Years to 65 Years
Enrollment
280 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2028
U.S. locations
7
States / cities
Los Angeles, California • Augusta, Georgia • Baltimore, Maryland + 2 more
Source: ClinicalTrials.gov public record
Updated May 3, 2026 · Synced Sep 8, 2026, 8:02 AM EDT
Completed Phase 4 Interventional Results available

Clozapine for Cannabis Use in Schizophrenia

NCT01639872
View directory record Official record
Conditions
Schizophrenia, Cannabis Abuse, Cannabis Dependence, Dual Diagnosis
Interventions
Clozapine, Risperidone
Drug
Lead sponsor
Dartmouth-Hitchcock Medical Center
Other
Eligibility
18 Years to 55 Years
Enrollment
49 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2017
U.S. locations
9
States / cities
Garden Grove, California • Oakland, California • Miami, Florida + 6 more
Source: ClinicalTrials.gov public record
Updated May 4, 2020 · Synced Sep 8, 2026, 8:02 AM EDT
Completed Phase 4 Interventional Results available

Risperidone Treatment in Schizophrenia Patients Who Are Currently Taking Clozapine

NCT00056498
View directory record Official record
Conditions
Schizophrenia
Interventions
Placebo, Risperdal
Drug
Lead sponsor
University of Maryland, Baltimore
Other
Eligibility
18 Years to 65 Years
Enrollment
65 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2007
U.S. locations
1
States / cities
Catonsville, Maryland
Source: ClinicalTrials.gov public record
Updated Sep 30, 2019 · Synced Sep 8, 2026, 8:02 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Clozapine CHAMPION-ECHO Educational Study to Improve Clozapine Use.

NCT04325386
View directory record Official record
Conditions
Schizophrenia Schizoaffective
Interventions
ECHO Intervention, eTAU
Other
Lead sponsor
University of Maryland, Baltimore
Other
Eligibility
22 Years to 85 Years
Enrollment
266 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2024
U.S. locations
1
States / cities
Catonsville, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 11, 2025 · Synced Sep 8, 2026, 8:02 AM EDT
Not listed Phase 4 Interventional

Clozapine Versus Olanzapine as Treatment for Comorbid Psychotic Disorder and Substance Use Disorder

NCT03857581
View directory record Official record
Conditions
Psychosis, Substance Use Disorders
Interventions
Clozapine, Olanzapine
Drug
Lead sponsor
Augusta University
Other
Eligibility
18 Years to 60 Years
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Evans, Georgia
Source: ClinicalTrials.gov public record
Updated Mar 22, 2020 · Synced Sep 8, 2026, 8:02 AM EDT
Recruiting Phase 2Phase 3 Interventional

An Adaptive Phase II/III, Two-Part, Double-Blind, Randomized, Placebo-controlled, Dose-Finding, Multi-center Study of the Safety and Efficacy of NaBen®, as an Add-on Therapy With Clozapine, for Residual Symptoms of Refractory Schizophrenia in Adults

NCT03094429
View directory record Official record
Conditions
Refractory Schizophrenia
Interventions
NaBen®, Placebo
Drug · Other
Lead sponsor
SyneuRx International (Taiwan) Corp
Industry
Eligibility
18 Years to 55 Years
Enrollment
287 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2026
U.S. locations
1
States / cities
Pasadena, California
Source: ClinicalTrials.gov public record
Updated Sep 12, 2021 · Synced Sep 8, 2026, 8:02 AM EDT
Completed Phase 4 Interventional Results available

Minocycline Augmentation to Clozapine

NCT02124811
View directory record Official record
Conditions
Schizophrenia, Schizoaffective Disorder
Interventions
Minocycline
Drug
Lead sponsor
Emory University
Other
Eligibility
18 Years to 65 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Sep 25, 2018 · Synced Sep 8, 2026, 8:02 AM EDT
Completed Not applicable Interventional Results available

First Episode Schizophrenia and Cannabis-Related Disorder Study

NCT00573287
View directory record Official record
Conditions
Cannabis-Related Disorder, Substance-Related Disorders, Schizophrenia, Psychotic Disorders
Interventions
clozapine, risperidone
Drug
Lead sponsor
Dartmouth-Hitchcock Medical Center
Other
Eligibility
17 Years to 45 Years
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2011
U.S. locations
5
States / cities
Concord, New Hampshire • Lebanon, New Hampshire • Manchester, New Hampshire + 1 more
Source: ClinicalTrials.gov public record
Updated Jul 22, 2019 · Synced Sep 8, 2026, 8:02 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Clozapine Therapy Sample Collection - Method Comparison Study

NCT05422131
View directory record Official record
Conditions
Patients Prescribed Clozapine
Interventions
MyCare Insite Clozapine Test
Device
Lead sponsor
Saladax Biomedical, Inc.
Industry
Eligibility
21 Years and older
Enrollment
153 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Bethlehem, Pennsylvania
Source: ClinicalTrials.gov public record
Updated May 17, 2023 · Synced Sep 8, 2026, 8:02 AM EDT