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RecruitingMajor Depressive Disorder

Study of ALTO-300 in MDD

Eligible age

18–70 yrs

Accepts

All genders

Locations

26 states

Healthy volunteers

No

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About this study

The purpose of this study is to determine efficacy differences between ALTO-300 and placebo, used adjunctively to an antidepressant, related to patient characteristics.

Sponsor: Alto Neuroscience

You may qualify if…

  • ✓ Have a diagnosis of moderate to severe major depressive disorder (MDD)
  • ✓ At Visit 1, currently taking a stable dose of 1 or 2 antidepressants (e.g., SSRI, SNRI, bupropion, or gepirone) for at least 6 weeks with no dose modifications in the past 2 weeks by Visit 2
  • ✓ Willing to comply with all study assessments and procedures
  • ✓ Must not be pregnant or breastfeeding at time of enrollment or throughout study

You may not qualify if…

  • ✕ Evidence of unstable medical condition
  • ✕ Nightly use of sleep medication
  • ✕ Diagnosed bipolar disorder, psychotic disorder, or dementia
  • ✕ Current moderate or severe substance use disorder
  • ✕ Has a history of hypersensitivity or allergic reaction to ALTO-300 or any of its components/excipients
  • ✕ Concurrent or recent participation in another clinical trial for mental illness involving an investigational product or device

Where it's recruiting

Arizona

Phoenix · Yuma

Arkansas

Rogers

California

Bellflower · Carlsbad · Glendale · Lafayette …

Colorado

Colorado Springs · Denver · Evergreen

Florida

Clermont · Miami Gardens · Miami Lakes · Okeechobee …

Georgia

Fayetteville · Savannah · Snellville · Stone Mountain

Idaho

Blackfoot · Boise

Illinois

Chicago

Kansas

Wichita

Louisiana

Marrero · Monroe

Massachusetts

Worcester

Source: ClinicalTrials.gov · NCT05922878 · last updated 2026-10-26

Study of ALTO-300 in MDD · TrialPath