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SPN-821

Phase 2

Major Depressive Disorder (MDD) | Small molecule | Psychiatry |Supernus Pharmaceuticals, Inc.|Last Updated: Mar 24, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment230

FDA Designations

No designations recorded

Clinical trial landscape

SPN-821 · 1 trial · 1 indication

Phase 2 1
NCT07226661Double-blind, Placebo-controlled Study in Adults With Major Depressive DisorderMajor Depressive Disorder (MDD)
RECRUITING230 Analytics
PHASE2RECRUITING
Double-blind, Placebo-controlled Study in Adults With Major Depressive Disorder
Major Depressive Disorder (MDD)Unlock trial analytics

Study Endpoints

Primary Endpoints

Change From Baseline to Day 29 in the Montgomery-Åsberg Depression Rating Scale (MADRS) Total Score.
4 weeks

MADRS is a 10-item scale (Reported sadness, Apparent sadness, Inner tension, Reduced sleep, Reduced appetite, Concentration difficulties, Lassitude, Inability to feel, Pessimist thoughts, and Suicidal thoughts) where each item is scored from 0 to 6. The total score is the sum of the 10 items ranging from 0 to 60 where higher scores indicate more severe depression, and lower scores are better outcomes.

Secondary Endpoints

Change From Baseline to Day 29 in the Clinical Global Impression - Severity of Illness Score (CGI-S).
4 weeks
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Study Design & Arms

AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
SPN-821 2400 mgEXPERIMENTALThree 800 mg oral tablets administered twice a week adjunctive to current antidepressant
PlaceboPLACEBO_COMPARATORThree oral tablets administered twice a week adjunctive to current antidepressant

Interventions

NameTypeDescription
SPN-821 2400 mgDRUGSPN-821 is a novel, orally bioavailable, selective, direct enhancer of mTORC1 cellular signaling
PlaceboDRUGMatched placebo oral tablets
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Eligibility Criteria

Age Range18 Years to 70 Years
SexALL
Healthy VolunteersNo
Study Sites1

Inclusion Criteria: * Current diagnosis of MDD according to the DSM-5 for either single or recurrent MDE without psychotic features confirmed by the MINI * Duration of current MDE of at least 8 weeks * MADRS total score of ≥ 24 at the Screening Visit and Day 1 Visit * CGI-S score of ≥ 4 (moderately...

Countries:United States
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Frequently asked questions about SPN-821

What is SPN-821 used for?

SPN-821 is an investigational small molecule being developed for the treatment of Major Depressive Disorder (MDD). It is currently in Phase 2 clinical development and has not been approved by the FDA. The drug is being studied in adults with MDD in a randomized, double-blind, placebo-controlled trial.

Who makes SPN-821?

SPN-821 is being developed by Supernus Pharmaceuticals, Inc., a biopharmaceutical company traded on the NASDAQ under the ticker symbol SUPN. The company is conducting a Phase 2 clinical trial of SPN-821 in adults with Major Depressive Disorder in the United States.

What phase is SPN-821 in?

SPN-821 is in Phase 2 clinical development. It is currently being evaluated in a randomized, double-blind, placebo-controlled study in adults with Major Depressive Disorder. The drug is investigational and has not yet received FDA approval.

What clinical trials is SPN-821 in?

SPN-821 is being studied in a Phase 2 clinical trial with the identifier NCT07226661. This is a double-blind, placebo-controlled study in adults with Major Depressive Disorder, with an enrollment target of 230 participants. The trial is currently recruiting participants in the United States.

Is SPN-821 the same as SPN-821 2400 mg?

Yes, SPN-821 is also known as SPN-821 2400 mg, which refers to the 2400 mg dose strength of the drug. The drug is being developed by Supernus Pharmaceuticals for the treatment of Major Depressive Disorder and is currently in Phase 2 clinical trials.