Clinical trial Recruiting at 28 sites Phase 3 Interventional Ages 18 and up

NBI-1065845 added to a current antidepressant for major depressive disorder

Official title: A Randomized, Double-Blind, Placebo-Controlled Study to Assess the Efficacy and Safety of NBI-1065845 as Adjunctive Treatment in Subjects With Major Depressive Disorder (MDD)

Run by Neurocrine Biosciences · NCT06963021 · Data updated 2026-11-12

This trial will test whether adding NBI-1065845 to a stable oral antidepressant helps adults with major depressive disorder who have not had enough benefit.

Quick facts

PhasePhase 3
Study typeInterventional
Ages18 Years and up
SexAll
Enrollment200 (estimated)
SponsorNeurocrine Biosciences
Industry-sponsored
Locations35 sites (Chino, California and 34 other locations)
StatusRecruiting
StartedMay 30, 2025
Main results expectedJuly 2027
Study endsJuly 2027
Registry record updatedAugust 10, 2026
Trial IDNCT06963021 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Adults with recurrent moderate or severe major depressive disorder or persistent depressive disorder who have had an inadequate response to at least 8 weeks of a stable oral antidepressant and have a HAM-D17 score of 22 or higher are the intended candidates.

Probably not a fit

People whose depression is primarily due to another psychiatric disorder treated in the past year, those judged to be at imminent suicide risk, or those already responding well to their current antidepressant are unlikely to benefit from this trial.

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 trial comparing NBI-1065845 with placebo as an add-on to participants' ongoing oral antidepressant medication. Eligible participants have recurrent moderate or severe MDD or persistent depressive disorder and an inadequate response to oral antidepressants, with a HAM-D17 score of 22 or higher at screening and baseline. Participants must have been on a stable oral antidepressant regimen for at least 8 weeks and continue that regimen unchanged during the trial while receiving either NBI-1065845 or placebo. Symptom change will be measured using standard depression rating scales to determine whether the adjunctive therapy provides additional benefit.

Why it matters

Potential benefit: If successful, this could provide an effective add-on medication option for people with MDD who do not respond adequately to current oral antidepressants.

How similar studies have gone: Adjunctive pharmacologic strategies are an established approach in MDD and earlier-phase data for NBI-1065845/TAK-653 provided enough signal to progress to this Phase 3 evaluation.

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 and is willing to continue the same oral antidepressants at the same dose and frequency of administration throughout participation in the study.
* Total Hamilton Depression Rating Scale-17 Item (HAM-D17) score ≥22 at screening and at study baseline (Day 1).
* 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.
* Participants depressive symptoms have previously demonstrated nonresponse to electroconvulsive therapy (ECT) in the current major depressive episode.

Where it's running

  • Neurocrine Clinical Site
    Chino, California, United States
    Recruiting
  • Neurocrine Clinical Site
    Los Angeles, California, United States
    Recruiting
  • Neurocrine Clinical Site
    Stanford, California, United States
    Recruiting
  • Neurocrine Clinical Site
    Aurora, Colorado, United States
    Recruiting
  • Neurocrine Clinical Site
    Maitland, Florida, United States
    Recruiting
  • Neurocrine Clinical Site
    Miami, Florida, United States
    Recruiting
Show 29 more locations
  • Neurocrine Clinical Site
    Cedarhurst, New York, United States
    Recruiting
  • Neurocrine Clinical Site
    New York, New York, United States
    Recruiting
  • Neurocrine Clinical Site
    Charlotte, North Carolina, United States
    Recruiting
  • Neurocrine Clinical Site
    Philadelphia, Pennsylvania, United States
    Recruiting
  • Neurocrine Clinical Site
    Bruges, Belgium
    Recruiting
  • Neurocrine Clinical Site
    Mechelen, Belgium
    Recruiting
  • Neurocrine Clinical Site
    Toronto, Ontario, Canada
    Recruiting
  • Neurocrine Clinical Site
    Verdun, Canada
    Recruiting
  • Neurocrine Clinical Site
    Kuopio, Finland
    Recruiting
  • Neurocrine Clinical Site
    Oulu, Finland
    Recruiting
  • Neurocrine Clinical Site
    Tampere, Finland
    Recruiting
  • Neurocrine Clinical Site
    Budapest, Hungary
    Recruiting
  • Neurocrine Clinical Site
    Budapest, Hungary
    Recruiting
  • Neurocrine Clinical Site
    Budapest, Hungary
    Recruiting
  • Neurocrine Clinical Site
    Gyöngyös, Hungary
    Recruiting
  • Neurocrine Clinical Site
    Jelgava, Latvia
    Recruiting
  • Neurocrine Clinical Site
    Liepāja, Latvia
    Recruiting
  • Neurocrine Clinical Site
    Sigulda, Latvia
    Recruiting
  • Neurocrine Clinical Site
    London, United Kingdom
    Recruiting
  • Neurocrine Clinical Site
    Salford, United Kingdom
    Recruiting
  • Neurocrine Clinical Site
    Sheffield, United Kingdom
    Recruiting
  • Neurocrine Clinical Site
    Southampton, United Kingdom
    Recruiting
  • Neurocrine Clinical Site
    Cromwell, Connecticut, United States
    Active not recruiting
  • Neurocrine Clinical Site
    Farmington, Connecticut, United States
    Active not recruiting
  • Neurocrine Clinical Site
    Tampa, Florida, United States
    Withdrawn
  • Neurocrine Clinical Site
    Gaithersburg, Maryland, United States
    Active not recruiting
  • Neurocrine Clinical Site
    New York, New York, United States
    Active not recruiting
  • Neurocrine Clinical Site
    Alken, Belgium
    Active not recruiting
  • Neurocrine Clinical Site
    Kalocsa, Hungary
    Active not recruiting

Study contacts

Similar studies

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

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  • A Phase 3 test of DT120 for major depressive disorder

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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.