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Brexanolone

Phase 3

Post Partum Depression | Small molecule | Psychiatry |Supernus Pharmaceuticals, Inc.|Last Updated: Oct 14, 2025

Target and mechanism

Molecular targetGABRA1, GABRB2, GABRG2, GABRB3, GABRA4, GABRG3
Target classPositive Allosteric Modulator
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLEDDMC
Total Trials1
Total Enrollment28

FDA Designations

No designations recorded

Clinical trial landscape

Brexanolone · 4 trials · 5 indications

Phase 3 1Phase 2 1Phase 1 1Early Phase 1 1
NCT03665038A Study to Assess the Safety of Brexanolone in the Treatment of Adolescent Female Participants With Postpartum Depression (PPD)Post Partum Depression
COMPLETED28 Analytics
PHASE3COMPLETED
A Study to Assess the Safety of Brexanolone in the Treatment of Adolescent Female Participants With Postpartum Depression (PPD)
Post Partum DepressionUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of Participants With Treatment-Emergent Adverse Events (TEAEs)
From first dose of study drug up to end of follow-up period (up to Day 30)

An adverse event (AE) is any untoward medical occurrence in a participant or clinical investigation participant administered a pharmaceutical product and that does not necessarily have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of a medicinal (investigational) product, whether or not related to the medicinal (investigational) product. A TEAE is defined as an AE with onset on or after the start of study drug infusion, or any worsening of a pre-existing medical condition/AE with onset on or after the start of study drug infusion.

Number of Participants With Treatment-Emergent Adverse Events (TEAE)
Up to Day 15

An adverse event (AE) is any untoward medical occurrence in a participant or clinical investigation participant administered a pharmaceutical product and that does not necessarily have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom or disease temporally associated with the use of a medicinal (investigational) product whether or not related to the medicinal (investigational) product. A TEAE is defined as an AE with onset after the start of brexanolone, or any worsening of a pre-existing medical condition/adverse event with onset after the start of brexanolone and throughout the study.

Treatment-emergent adverse events
30 days following administration of brexanolone

Treatment-emergent adverse events will be assessed following administration of brexanolone.

Change in Positive and Negative Syndrome Scale (PANSS) score
Baseline to post-treatment day 7

The PANSS is a standardized, clinical interview that rates the presence and severity of psychosis. The PANSS yields a total average symptom score, based on 30 items rated from one to seven (range=30-210). Higher scores indicate more severe symptoms.

Change in Young Mania Rating Scale (YMRS) score
Baseline to post-treatment day 7

The Young Mania Rating Scale (YMRS) is one of the most frequently utilized rating scales to assess manic symptoms. The scale has 11 items and is based on the patient's subjective report of his or her clinical condition over the previous 48 hours. The items are selected based upon the core symptoms of mania. The YMRS total score ranges from 0 to 60 where higher scores indicate more severe symptoms.

Secondary Endpoints

Area Under the Concentration-Time Curve (AUC) From Time Zero to 60 Hours (AUC0-60)
Day 1: From 0 hour (pre-infusion) and at 4, 8, 12, 24, 30, 36, 48 hours during the infusion; at 60 hours (end of infusion)
AUC From Time Zero to Infinity (AUCinf)
Day 1: From 0 hour (pre-infusion) and at 4, 8, 12, 24, 30, 36, 48 hours during the infusion; at 60 hours (end of infusion)
Maximum (Peak) Plasma Concentration (Cmax)
Day 1: From 0 hour (pre-infusion) and at 4, 8, 12, 24, 30, 36, 48 hours during the infusion; at 60 hours (end of infusion)
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
BrexanoloneEXPERIMENTALParticipants will receive a 60-hour single continuous IV infusion of brexanolone, at 30 mcg/kg/hour (0 to 4 hours), at 60 mcg/kg/hour (4 to 24 hours), at 90 mcg/kg/hour (24 to 52 hours), followed by a taper to 60 mcg/kg/hour (52 to 56 hours), and 30 mcg/kg/hour (56 to 60 hours) during the study.
BrexanaoloneEXPERIMENTALIn this single-arm study, participants will be administered brexanolone as a continuous IV infusion over 20 hours (titrated up to 90mcg/kg/hour).
Open Label - Active DrugEXPERIMENTALBrexanolone (zulresso) infusion arm. All patients enrolled will receive active treatment with brexanolone.

Interventions

NameTypeDescription
BrexanoloneDRUGAdministered as IV infusion.
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Eligibility Criteria

Age Range15 Years to 17 Years
SexFEMALE
Healthy VolunteersNo
Study Sites17

Key Inclusion Criteria: 1. Participant has had a major depressive episode that began no earlier than the third trimester and no later than the first 4 weeks following delivery, as diagnosed by Structured Clinical Interview for Diagnostic and Statistical Manual of Mental Disorders (DSM-5) Axis I Dis...

Countries:United States
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Frequently asked questions about Brexanolone

What is Brexanolone used for?

Brexanolone is an investigational small molecule being studied for several psychiatric conditions, including post-traumatic stress disorder (PTSD), postpartum depression, postpartum psychosis, and tinnitus. It is being developed by Supernus Pharmaceuticals, Inc. (SUPN). The drug is currently in Phase 1 clinical development for these indications.

What does Brexanolone target?

Brexanolone is a small molecule that modulates the GABA-A receptor, a key inhibitory neurotransmitter system in the brain. By enhancing GABAergic signaling, it aims to restore neuronal balance and alleviate symptoms associated with conditions like PTSD, postpartum depression, and postpartum psychosis. This mechanism is being investigated in clinical trials.

Who makes Brexanolone?

Brexanolone is being developed by Supernus Pharmaceuticals, Inc., a biopharmaceutical company traded on NASDAQ under the ticker symbol SUPN. The company is conducting clinical trials to evaluate the drug's safety and efficacy for psychiatric and neurological conditions.

What phase is Brexanolone in?

Brexanolone is currently in Phase 1 clinical development. While some trials listed for the drug are in earlier or later phases, the overall development stage is Phase 1. It is an investigational drug and has not been approved by the FDA for any indication.

What clinical trials is Brexanolone in?

Brexanolone has been studied in several clinical trials, including NCT03665038 for postpartum depression, NCT05223829 for PTSD and alcohol use disorder, NCT05314153 for postpartum psychosis, and NCT05645432 for tinnitus. These trials have been conducted in the United States with varying enrollment sizes.

Is Brexanolone the same as Zulresso?

Yes, Brexanolone is also known as Zulresso, as indicated by a clinical trial titled 'Effects Zulresso on Postpartum Psychosis' (NCT05314153). Zulresso is the brand name used in that study, while Brexanolone is the generic name of the drug.