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RecruitingNCT06963021Updated Aug 10, 2026

NBI-1065845-MDD3026: Study to Assess the Efficacy and Safety of NBI-1065845 as an Adjunctive Treatment in Participants With Major Depressive Disorder (MDD)

A Phase 3 interventional study of NBI-1065845 and Placebo in Major Depressive Disorder, sponsored by Neurocrine Biosciences. Recruiting at 35 sites in 7 countries. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-08-10.

Sponsored by Neurocrine Biosciences · Phase 3, Interventional, and Treatment

From the registry’s dates

  • Started May 2025; still recruiting 1 year 5 months later.
Phase
Phase 3
Study type
Interventional
Enrollment
200
Allocation
Randomized
Ages
18 Years and older
Sex
All
01

Study summary

The study will evaluate the efficacy of NBI-1065845 compared with placebo as an adjunctive treatment in participants with MDD on improving symptoms of depression.

02

Conditions studied

  • Major Depressive Disorder

Keywords

  • MDD
  • Depression
  • Major Depressive Disorder
  • NBI-1065845
  • TAK-653
  • MADRS
03

In context

Depressive Disorder, Major

3,041 studies on the registry are indexed under Depressive Disorder, Major; 588 are open to participants now.

This study's planned enrollment of 200 is above the median of 79 across 2,530 interventional studies indexed under Depressive Disorder, Major.

Browse Depressive Disorder, Major studies →

Lead sponsor

Neurocrine Biosciences is the lead sponsor of 86 studies on the registry; 16 are open to participants now.

Of its 35 completed or terminated interventional studies of FDA-regulated products, 23 (66%) have results posted.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
No

Eligibility 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.
05

Study design

Phase
Phase 3
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Quadruple (Participant, Care provider, Investigator, Outcomes assessor)
Enrollment
200 participants (estimated)

Study arms

  • Experimental
    NBI-1065845

    NBI-1065845 administered orally once a day.

    Drug: NBI-1065845

  • Placebo comparator
    Placebo

    Placebo identical in appearance to NBI-1065845 will be administered orally once a day.

    Drug: Placebo

Interventions

  • NBI-1065845 tablets

    Also known as: TAK-653

  • DrugPlacebo

    Matching placebo tablets

06

What researchers measure

Primary outcomes

  1. Change from Baseline in Total Montgomery-Åsberg Depression Rating Scale (MADRS) Score at Day 56

    Time frame: Baseline, Day 56

Secondary outcomes

  1. Change from Baseline in Sheehan Disability Scale (SDS) Total Score at Day 56

    Time frame: Baseline, Day 56

  2. Change from Baseline in Clinical Global Impression-Severity Scale (CGI-S) Score at Day 56

    Time frame: Baseline, Day 56

07

Study locations

28 of 35 sites recruiting
  • Neurocrine Clinical Site
    Chino, California 91710, United States
    Recruiting
  • Neurocrine Clinical Site
    Los Angeles, California 90025, United States
    Recruiting
  • Neurocrine Clinical Site
    Stanford, California 94305, United States
    Recruiting
  • Neurocrine Clinical Site
    Aurora, Colorado 80045, United States
    Recruiting
  • Neurocrine Clinical Site
    Cromwell, Connecticut 06416, United States
    Active, not recruiting

    Not enrolling at this site — choose another above.

  • Neurocrine Clinical Site
    Farmington, Connecticut 06030, United States
    Active, not recruiting

    Not enrolling at this site — choose another above.

  • Neurocrine Clinical Site
    Maitland, Florida 32751, United States
    Recruiting
  • Neurocrine Clinical Site
    Miami, Florida 33136, United States
    Recruiting
  • Neurocrine Clinical Site
    Tampa, Florida 33613, United States
    Withdrawn

    Not enrolling at this site — choose another above.

  • Neurocrine Clinical Site
    Gaithersburg, Maryland 20877, United States
    Active, not recruiting

    Not enrolling at this site — choose another above.

  • Neurocrine Clinical Site
    Cedarhurst, New York 11516, United States
    Recruiting
  • Neurocrine Clinical Site
    New York, New York 10029, United States
    Active, not recruiting

    Not enrolling at this site — choose another above.

  • Neurocrine Clinical Site
    New York, New York 10128, United States
    Recruiting
  • Neurocrine Clinical Site
    Charlotte, North Carolina 28211, United States
    Recruiting
  • Neurocrine Clinical Site
    Philadelphia, Pennsylvania 19104, United States
    Recruiting
  • Neurocrine Clinical Site
    Alken, 3570, Belgium
    Active, not recruiting

    Not enrolling at this site — choose another above.

  • Neurocrine Clinical Site
    Bruges, 8310, Belgium
    Recruiting
  • Neurocrine Clinical Site
    Mechelen, 2800, Belgium
    Recruiting
  • Neurocrine Clinical Site
    Toronto, Ontario M5B 1W8, Canada
    Recruiting
  • Neurocrine Clinical Site
    Verdun, H4H 1R3, Canada
    Recruiting
  • Neurocrine Clinical Site
    Kuopio, 70110, Finland
    Recruiting
  • Neurocrine Clinical Site
    Oulu, 90100, Finland
    Recruiting
  • Neurocrine Clinical Site
    Tampere, 33210, Finland
    Recruiting
  • Neurocrine Clinical Site
    Budapest, 1036, Hungary
    Recruiting
  • Neurocrine Clinical Site
    Budapest, 1083, Hungary
    Recruiting
  • Neurocrine Clinical Site
    Budapest, 1135, Hungary
    Recruiting
  • Neurocrine Clinical Site
    Gyöngyös, 3200, Hungary
    Recruiting
  • Neurocrine Clinical Site
    Kalocsa, 6300, Hungary
    Active, not recruiting

    Not enrolling at this site — choose another above.

  • Neurocrine Clinical Site
    Jelgava, LV-3008, Latvia
    Recruiting
  • Neurocrine Clinical Site
    Liepāja, LV-3401, Latvia
    Recruiting
  • Neurocrine Clinical Site
    Sigulda, LV-2150, Latvia
    Recruiting
  • Neurocrine Clinical Site
    London, SE5 8AZ, United Kingdom
    Recruiting
  • Neurocrine Clinical Site
    Salford, M6 8HD, United Kingdom
    Recruiting
  • Neurocrine Clinical Site
    Sheffield, S5 7JT, United Kingdom
    Recruiting
  • Neurocrine Clinical Site
    Southampton, SO30 3JB, United Kingdom
    Recruiting
08

References and documents

Individual participant data

Plan to share: No

No publications or documents are linked to this record.

09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Aug 10, 2026, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT06963021
Responsible party
Sponsor
First posted
May 8, 2025
Start date
May 30, 2025
Primary completion
Jul 2027 (estimated)
Completion
Jul 2027 (estimated)
Last update
Aug 10, 2026

Study contacts

Neurocrine Medical Information Call Center
Contact
medinfo@neurocrine.com
1-877-641-3461
Clinical Development Lead
study director · Neurocrine Biosciences

Oversight

Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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