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
Connecticut
Norwalk
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