Clinical trial Recruiting at 53 sites Phase 3 Interventional Ages 18 to 65

Using Lumateperone to help treat major depressive disorder

Official title: A Randomized, Double-Blind, Placebo-controlled Multicenter Study to Assess the Efficacy and Safety of Lumateperone as Adjunctive Therapy in the Treatment of Patients With Major Depressive Disorder

Run by Intra-Cellular Therapies, Inc. · NCT05850689 · Data updated 2026-11-12

This study is testing if adding a medication called lumateperone can help people with major depressive disorder who aren't getting better with their current antidepressants.

Quick facts

PhasePhase 3
Study typeInterventional
Ages18 Years to 65 Years
SexAll
Enrollment470 (estimated)
SponsorIntra-Cellular Therapies, Inc.
Industry-sponsored
Locations69 sites (Huntsville, Alabama and 68 other locations)
StatusRecruiting
StartedMay 2, 2023
Main results expectedApril 5, 2027
Study endsApril 5, 2027
Registry record updatedNovember 3, 2026
Trial IDNCT05850689 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are adults aged 18 to 65 with a confirmed diagnosis of major depressive disorder and inadequate response to current antidepressant therapy.

Probably not a fit

Patients with mild depressive symptoms or those who have not been on antidepressant therapy may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This multicenter, randomized, double-blind, placebo-controlled study aims to evaluate the efficacy of lumateperone as an adjunctive therapy for patients with major depressive disorder (MDD) who have not responded adequately to ongoing antidepressant treatment. The study consists of a screening period, a 6-week double-blind treatment phase where participants receive either lumateperone or a placebo, and a 1-week safety follow-up period. Participants will be assessed for eligibility based on specific diagnostic criteria and severity of their depressive symptoms.

Why it matters

Potential benefit: If successful, this treatment could provide a new option for patients with major depressive disorder who have not responded to existing therapies.

How similar studies have gone: Previous studies have shown promise in using adjunctive therapies for major depressive disorder, suggesting potential for success with this approach.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

1. Male or female patients between the ages of 18 and 65 years, inclusive;
2. Meets DSM-5 criteria for MDD (MDD with psychotic features will be acceptable) as confirmed by the Investigator or Sponsor-approved rater using the modified Structured Clinical Interview for DSM-5, Clinical Trials Version (SCID-5-CT) and meets all of the following criteria:

   1. The start of the current major depressive episode (MDE) is at least 12 weeks but not more than 18 months prior to Screening;
   2. Has at least moderate severity of illness based on rater-administered MADRS total score ≥ 24 at Screening and at Baseline;
   3. Has at least moderate severity of illness based on CGI-S score ≥ 4 at Screening and at Baseline;
   4. Has a Quick Inventory of Depressive Symptomatology-Self Report-16 item (QIDS-SR-16) score ≥ 14 at Screening and at Baseline;
   5. Has sufficient history and medical record confirmation verifying the ADT and the current MDE is causing clinically significant distress or impairment in social, occupational, or other important areas of functioning.
3. Currently having an inadequate response (less than 50% improvement) to 2 or more ADTs in the current MDE as confirmed by the Investigator using the Antidepressant Treatment Response Questionnaire (ATRQ) and taking at least the minimum effective dose (per package insert) of one of the following antidepressants as monotherapy treatment for at least 6 weeks duration:

   1. citalopram/escitalopram
   2. fluoxetine
   3. paroxetine
   4. sertraline
   5. duloxetine
   6. levomilnacipran/milnacipran (if locally approved for MDD)
   7. venlafaxine/desvenlafaxine
   8. bupropion
   9. vilazodone
   10. vortioxetine

Exclusion Criteria:

1. Within the patient's lifetime, has a confirmed DSM-5 psychiatric diagnosis other than MDD, including:

   1. Schizophrenia, Schizoaffective Disorder, Schizophreniform Disorder or other psychotic disorder;
   2. Bipolar Disorder;
2. Within 6 months of Screening, has a confirmed DSM-5 psychiatric diagnosis other than MDD including:

   1. Anxiety disorders such as Panic Disorder or Generalized Anxiety Disorder; Obsessive-compulsive Disorder; Posttraumatic Stress Disorder as primary diagnoses. Note: Anxiety symptoms may be allowed if secondary to MDD, provided these symptoms do not require concurrent treatment;
   2. Eating disorder;
   3. Substance use disorders (excluding nicotine);
   4. Personality disorder of sufficient severity to have a major impact on the patient's psychiatric status;
   5. Within 12 months of Screening, has had any other psychiatric condition (other than MDD) that has been the main focus of treatment;
3. The patient experiences a ≥ 25% decrease in the MADRS total score between Screening and Baseline;
4. The patient experiences a ≥ 25% decrease in the QIDS-SR-16 total score between Screening and Baseline;
5. In the opinion of the Investigator, the patient has a significant risk for suicidal behavior during participation in the study or:

   1. At Screening, the patient scores "yes" on Suicidal Ideation Items 4 or 5 of the Columbia-Suicide Severity Rating Scale (C-SSRS) within 6 months prior to Screening, or at Baseline, the patient scores "yes" on Suicidal Ideation Items 4 or 5 since the Screening Visit;
   2. At Screening, the patient has had 1 or more suicide attempts within 2 years prior to Screening;
   3. At Screening or Baseline, the patient scores ≥ 5 on MADRS Item 10 (Suicidal Thoughts), or
   4. The patient is considered to be in imminent danger to him/herself or others.
6. The patient has a first MDE at age 60 years or older.

Where it's running

  • University of Alabama at Birmingham
    Huntsville, Alabama, United States
    Recruiting
  • CNRI-Los Angeles, LLC
    Pico Rivera, California, United States
    Recruiting
  • University of Connecticut Health Center
    Farmington, Connecticut, United States
    Recruiting
  • Premier Clinical Research Institute
    Miami, Florida, United States
    Recruiting
  • Miami Jewish Health System
    Miami, Florida, United States
    Recruiting
  • Interventional Psychiatry of Tampa Bay
    Tampa, Florida, United States
    Recruiting
Show 44 more locations
  • The Emory Clinic
    Atlanta, Georgia, United States
    Recruiting
  • CenExeli Research LLC
    Decatur, Georgia, United States
    Recruiting
  • Collective Medical Research
    Overland Park, Kansas, United States
    Recruiting
  • Psychiatric Care and Research Center (PCRC)
    O'Fallon, Missouri, United States
    Recruiting
  • Bio Behavioral Health
    Toms River, New Jersey, United States
    Recruiting
  • SPRI Clinical Trials, LLC
    Brooklyn, New York, United States
    Recruiting
  • Manhattan Behavioral Medicine
    New York, New York, United States
    Recruiting
  • Quest Therapeutics of Avon Lake
    Avon Lake, Ohio, United States
    Recruiting
  • University of Cincinnati Medical Center
    Cincinnati, Ohio, United States
    Recruiting
  • The Ohio State University
    Columbus, Ohio, United States
    Recruiting
  • University of Pennsylvania - Perelman School of Medicine
    Philadelphia, Pennsylvania, United States
    Recruiting
  • DM Clinical Research
    Houston, Texas, United States
    Recruiting
  • Pillar Clinical Research, LLC
    Richardson, Texas, United States
    Recruiting
  • Northwest Clinical Research Center
    Bellevue, Washington, United States
    Recruiting
  • Ambulatory for Individual Practice for Specialized Medical Care in Psychiatry Dr. Ivo Natsov ET
    Cherven Bryag, Bulgaria
    Recruiting
  • Medical Center Lifemed
    Kardzhali, Bulgaria
    Recruiting
  • Medical Center Medconsult-Pleven
    Pleven, Bulgaria
    Recruiting
  • Medical Center Mentalcare OOD
    Plovdiv, Bulgaria
    Recruiting
  • MHC - Sofia, EOOD
    Sofia, Bulgaria
    Recruiting
  • Medical Center Hera EOOD
    Sofia, Bulgaria
    Recruiting
  • Medical Center Intermedica, OOD
    Sofia, Bulgaria
    Recruiting
  • Diagnostic Consulting Center Mladost - M Varna
    Varna, Bulgaria
    Recruiting
  • Cabinet Medical des Drs Prizac-Desbonnet Scottez
    Douai, France
    Recruiting
  • CHU de Nantes hotel Dieu
    Nantes, France
    Recruiting
  • Hopital Caremeau
    Nîmes, France
    Recruiting
  • Groupe Hospitalier Pitie-Salpetriere
    Paris, France
    Recruiting
  • CH Henri Laborit
    Poitiers, France
    Recruiting
  • Baramati Hospital
    Bārāmati, India
    Recruiting
  • S P Medical College And Associated Group of Hospitals
    Bikaner, India
    Recruiting
  • Post Graduate Institute of Medical Education And Research PGIMER
    Chandigarh, India
    Recruiting
  • Swastik Hospital
    Kolhāpur, India
    Recruiting
  • KIMS-Kingsway Hospitals
    Nagpur, India
    Recruiting
  • Divyam Hospital
    Palsāna, India
    Recruiting
  • Shree Samarth Hospital
    Pune, India
    Recruiting
  • Clinical Center Dr Dragisa Misovic Dedinje
    Belgrade, Serbia
    Recruiting
  • Institute of Mental Health Serbia
    Belgrade, Serbia
    Recruiting
  • University Clinical Center of Serbia
    Belgrade, Serbia
    Recruiting
  • Special Hospital for Psychiatric Diseases Kovin
    Kovin, Serbia
    Recruiting
  • University Clinical Center Kragujevac 1
    Kragujevac, Serbia
    Recruiting
  • University Clinical Center Kragujevac
    Kragujevac, Serbia
    Recruiting
  • University Clinical Center NIS 1
    Niš, Serbia
    Recruiting
  • University Clinical Center NIS
    Niš, Serbia
    Recruiting
  • Special Hospital for Psychiatric Diseases Sveti Vracevi
    Novi Kneževac, Serbia
    Recruiting
  • Hosp Univ Vall D Hebron
    Barcelona, Spain
    Recruiting

+19 more sites. See ClinicalTrials.gov for the full list.

Study contacts

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How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.