Clinical trial Recruiting at 106 sites Phase 3 Interventional Ages 18 and up

Long-term safety and tolerability of NBI-1065845 added to antidepressants for major depression

Official title: A Long-Term, Open-Label Study to Assess the Safety and Tolerability of NBI-1065845 as Adjunctive Treatment in Subjects With Major Depressive Disorder (MDD)

Run by Neurocrine Biosciences · NCT06966401 · Data updated 2026-11-12

This will test whether taking NBI-1065845 alongside regular oral antidepressants is safe and tolerable long-term for adults with major depressive disorder who haven't responded well to treatment.

More Major Depressive Disorder trials

Quick facts

PhasePhase 3
Study typeInterventional
Ages18 Years and up
SexAll
Enrollment850 (estimated)
SponsorNeurocrine Biosciences
Industry-sponsored
Locations120 sites (Huntsville, Alabama and 119 other locations)
StatusRecruiting
StartedApril 16, 2025
Main results expectedMay 2029
Study endsMay 2030
Registry record updatedNovember 2, 2026
Trial IDNCT06966401 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Adults with recurrent major depressive disorder or persistent depressive disorder who have had an inadequate response to at least 8 weeks of oral antidepressant treatment in the current episode and who can comply with study procedures.

Probably not a fit

People with a primary non-MDD psychiatric disorder in the past year, those judged to be at imminent risk of suicide or harm, or those who cannot follow study procedures are unlikely to benefit from enrolling.

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

What this trial studies

This is a phase 3 interventional study of NBI-1065845 given as an adjunct to participants' ongoing oral antidepressants to characterize long-term safety and tolerability. Eligible participants have recurrent major depressive disorder or persistent depressive disorder and an inadequate response to current oral antidepressant treatment. Participants will continue their antidepressant regimen while receiving NBI-1065845 and will be monitored regularly for adverse events, laboratory changes, and suicidality. The protocol excludes those with another primary psychiatric disorder within the past year or those judged to be at imminent risk of self-harm.

Why it matters

Potential benefit: If successful, this could provide an additional adjunctive medication option that is safe and tolerable for people whose depression has not responded adequately to standard oral antidepressants.

How similar studies have gone: Adjunctive pharmacologic approaches have shown benefit in prior depression trials, and early-phase data for TAK-653/NBI-1065845 suggest pharmacologic activity, but long-term adjunctive safety for this agent is not yet well established.

Who can join: the full rules

Show full inclusion / exclusion criteria
Key Inclusion Criteria:

* Participant has a primary diagnosis of recurrent MDD (moderate or severe) or persistent depressive disorder.
* Participant has had an inadequate response to oral antidepressant treatments in the current episode of depression.
* Participant must have been taking oral antidepressants for at least 8 weeks prior to screening.
* Willing and able to comply with all study procedures and restrictions in the opinion of the investigator.

Key Exclusion Criteria:

* A current or prior psychiatric disorder diagnosis in the last 1 year that was the primary focus of treatment other than MDD.
* Are considered by the investigator to be at imminent risk of suicide or injury to self or others.

Other protocol defined inclusion and exclusion criteria apply.

Where it's running

  • Neurocrine Clinical Site
    Huntsville, Alabama, United States
    Recruiting
  • Neurocrine Clinical Site
    Bryant, Arkansas, United States
    Recruiting
  • Neurocrine Clinical Site
    Little Rock, Arkansas, United States
    Recruiting
  • Neurocrine Clinical Site
    Chino, California, United States
    Recruiting
  • Neurocrine Clinical Site
    Glendale, California, United States
    Recruiting
  • Neurocrine Clinical Site
    Irvine, California, United States
    Recruiting
Show 44 more locations
  • Neurocrine Clinical Site
    Los Angeles, California, United States
    Recruiting
  • Neurocrine Clinical Site
    Oceanside, California, United States
    Recruiting
  • Neurocrine Clinical Site
    Orange, California, United States
    Recruiting
  • Neurocrine Clinical Site
    Pico Rivera, California, United States
    Recruiting
  • Neurocrine Clinical Site
    San Diego, California, United States
    Recruiting
  • Neurocrine Clinical Site
    San Jose, California, United States
    Recruiting
  • Neurocrine Clinical Site
    Cromwell, Connecticut, United States
    Recruiting
  • Neurocrine Clinical Site
    Farmington, Connecticut, United States
    Recruiting
  • Neurocrine Clinical Site
    Hollywood, Florida, United States
    Recruiting
  • Neurocrine Clinical Site
    Maitland, Florida, United States
    Recruiting
  • Neurocrine Clinical Site
    Maitland, Florida, United States
    Recruiting
  • Neurocrine Clinical Site
    Miami, Florida, United States
    Recruiting
  • Neurocrine Clinical Site
    Miami Gardens, Florida, United States
    Recruiting
  • Neurocrine Clinical Site
    Palm Bay, Florida, United States
    Recruiting
  • Neurocrine Clinical Site
    Tampa, Florida, United States
    Recruiting
  • Neurocrine Clinical Site
    Tampa, Florida, United States
    Recruiting
  • Neurocrine Clinical Site
    Tampa, Florida, United States
    Recruiting
  • Neurocrine Clinical Site
    Atlanta, Georgia, United States
    Recruiting
  • Neurocrine Clinical Site
    Gaithersburg, Maryland, United States
    Recruiting
  • Neurocrine Clinical Site
    Boston, Massachusetts, United States
    Recruiting
  • Neurocrine Clinical Site
    Watertown, Massachusetts, United States
    Recruiting
  • Neurocrine Clinical Site
    O'Fallon, Missouri, United States
    Recruiting
  • Neurocrine Clinical Site
    Saint Charles, Missouri, United States
    Recruiting
  • Neurocrine Clinical Site
    Cedarhurst, New York, United States
    Recruiting
  • Neurocrine Clinical Site
    Mount Kisco, New York, United States
    Recruiting
  • Neurocrine Clinical Site
    New York, New York, United States
    Recruiting
  • Neurocrine Clinical Site
    New York, New York, United States
    Recruiting
  • Neurocrine Clinical Site
    The Bronx, New York, United States
    Recruiting
  • Neurocrine Clinical Site
    Avon Lake, Ohio, United States
    Recruiting
  • Neurocrine Clinical Site
    Edmond, Oklahoma, United States
    Recruiting
  • Neurocrine Clinical Site
    Philadelphia, Pennsylvania, United States
    Recruiting
  • Neurocrine Clinical Site
    Dallas, Texas, United States
    Recruiting
  • Neurocrine Clinical Site
    DeSoto, Texas, United States
    Recruiting
  • Neurocrine Clinical Site
    Houston, Texas, United States
    Recruiting
  • Neurocrine Clinical Site
    Stafford, Texas, United States
    Recruiting
  • Neurocrine Clinical Site
    The Woodlands, Texas, United States
    Recruiting
  • Neurocrine Clinical Site
    Draper, Utah, United States
    Recruiting
  • Neurocrine Clinical Site
    Carlton, Victoria, Australia
    Recruiting
  • Neurocrine Clinical Site
    Melbourne, Australia
    Recruiting
  • Neurocrine Clinical Site
    Alken, Belgium
    Recruiting
  • Neurocrine Clinical Site
    Mechelen, Belgium
    Recruiting
  • Neurocrine Clinical Site
    Plovdiv, Bulgaria
    Recruiting
  • Neurocrine Clinical Site
    Sofia, Bulgaria
    Recruiting
  • Neurocrine Clinical Site
    Sofia, Bulgaria
    Recruiting

+70 more sites. See ClinicalTrials.gov for the full list.

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

  • Dupilumab for Major Depressive Disorder

    This study tests whether dupilumab can engage immune targets in adults with major depressive disorder to see if it can help with depressive symptoms.

    Recruiting Phase 2 Icahn School of Medicine at Mount Sinai · New York, New York · NCT07908563

  • Accelerated vs Standard iTBS for Major Depression

    This trial tests whether giving more accelerated iTBS sessions is better tolerated and more effective than the standard schedule for adults with major depressive disorder.

    Recruiting Military Hospital 175 · Ho Chi Minh City · NCT07768397

  • Psilocybin with Structured Integrated Reframing Therapy for trauma-related MDD and PTSD

    This trial tests whether psilocybin therapy, alone or with Structured Integrated Reframing Therapy (SIRT), helps people with trauma-related major depressive disorder who are already on a stable antidepressant.

    Recruiting Phase 3 Khyber Medical University Peshawar · Islamabad, Capital and 2 other locations · NCT07703722

  • Magnesium Bisglycinate Added to Your Depression Treatment

    This study tests whether adding magnesium bisglycinate to your current antidepressant can help reduce depressive symptoms and improve sleep and daily functioning for adults with major depressive disorder.

    Recruiting All India Institute of Medical Sciences, Bhubaneswar · Bhubaneswar, Odisha · NCT07633080

  • Motif XCS System for treatment-resistant depression

    This study tests whether the Motif XCS System is safe and tolerable and might help people with treatment-resistant major depressive disorder.

    Recruiting at 4 sites Motif Neurotech, Inc. · Atlanta, Georgia and 3 other locations · NCT07594483

  • A Phase 3 test of DT120 for major depressive disorder

    DT120 is tested against placebo in adults with major depressive disorder to see if it can help reduce depressive symptoms.

    Recruiting at 23 sites Phase 3 Definium Therapeutics US, Inc. · Little Rock, Arkansas and 25 other locations · NCT07592689

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.