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Study identifier: NCT05922878 Synced from ClinicalTrials.gov · August 08, 2026
● Study status: Recruiting

Study of ALTO-300 in MDD

Condition: Major Depressive Disorder  ·  Sponsor: Alto Neuroscience

PhasePhase 2
Planned participants321
Who can joinAll sexes, 18 Years to 70 Years
Healthy volunteersNoCheck eligibility criteria ↓
Where45 locations

Interested? Contact the study team ↓

Sponsor, CRO or site team? See where this study is running → — listed sites, countries and recruiting context. Everything below is written for patients and caregivers.

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.

This description comes directly from the study's public registry record.

Talk to the study team

Alto Neuroscience  ·  650-200-0412  ·  clinical@altoneuroscience.com

There is no obligation to join — the study team can answer your questions about taking part.

Always discuss trial participation with your own doctor first.

Full eligibility criteria (exactly as the study team wrote them)

Inclusion Criteria: * Have a diagnosis of moderate to severe major depressive disorder (MDD) * At Visit 1, currently taking a single SSRI, SNRI, or bupropion 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 Exclusion Criteria: * 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

Reproduced word-for-word from the public registry record — the study team can answer questions about it.

Locations (45)

Site 200Phoenix, Arizona, United StatesRecruiting
Site 189Phoenix, Arizona, United StatesWithdrawn
Site 187Yuma, Arizona, United StatesRecruiting
Site 193Rogers, Arkansas, United StatesRecruiting
Site 218Bellflower, California, United StatesRecruiting
Site 217Glendale, California, United StatesRecruiting
Site 335Lafayette, California, United StatesRecruiting
Site 209Los Angeles, California, United StatesRecruiting
Site 219Mather, California, United StatesRecruiting
Site 194Mission Viejo, California, United StatesRecruiting
Site 197Temecula, California, United StatesRecruiting
Site 203Colorado Springs, Colorado, United StatesRecruiting

+ 33 more locations — full list on the registry record.

More studies in these areas

This study lists sites in the areas below. Each link shows other recruiting studies near that city, from the public registry record.

PhoenixYumaRogersBellflower

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