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AXS-12

NDA/BLA

Narcolepsy | Small molecule | Neurology |Axsome Therapeutics, Inc.|Trials Updated: Jun 15, 2026

AXS-12 target and mechanism

ModalitySmall molecule

Also known as AXS-12 (Reboxetine)

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials3
Total Enrollment179

FDA Designations

ORPHAN_DRUG

AXS-12 clinical trials

AXS-12 · 3 trials · 5 indications

Phase 3 2Phase 2 1
NCT05113745A Study to Assess the Long-term Efficacy and Safety of AXS-12 (Reboxetine) in Subjects With Narcolepsy (ENCORE)Narcolepsy
COMPLETED68 Analytics
NCT05059223A Study to Assess the Efficacy and Safety of AXS-12 (Reboxetine) in Patients With NarcolepsyNarcolepsy
COMPLETED90 Analytics
PHASE3COMPLETED
A Study to Assess the Long-term Efficacy and Safety of AXS-12 (Reboxetine) in Subjects With Narcolepsy (ENCORE)
NarcolepsyUnlock trial analytics
PHASE3COMPLETED
A Study to Assess the Efficacy and Safety of AXS-12 (Reboxetine) in Patients With Narcolepsy
NarcolepsyUnlock trial analytics

Study Endpoints

Primary Endpoints

Long-term safety as measured by the incidence of treatment-emergent adverse events
Up to 28 weeks
Efficacy as measured by change in frequency of cataplexy attacks from baseline.
Baseline to Week 27
Frequency of cataplexy attacks
Change from Baseline to Week 5

Average number of cataplexy attacks per week

Change From Baseline in the Weekly Average Total Number of Cataplexy Attacks
2 weeks

Presented as LSmeans. A positive change is indicative of improvement.

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Study Design & Arms

AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
AXS-12 (reboxetine)EXPERIMENTAL* Up to 24 weeks in open-label period * Up to 4 weeks in randomized double-blind period
PlaceboPLACEBO_COMPARATORUp to 4 weeks in randomized double-blind period

Interventions

NameTypeDescription
AXS-12 (reboxetine)DRUGAXS-12 tablets, taken twice daily
PlaceboDRUGPlacebo tablets, taken twice daily
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Eligibility Criteria

Age Range15 Years to 75 Years
SexALL
Healthy VolunteersNo
Study Sites25

Inclusion Criteria: * Completed the treatment period of Study AXS-12-301 * Willing and able to comply with the study requirements Exclusion Criteria: * Significant change in medical history or concomitant medications since enrolling in the AXS-12-301 study which, in the opinion of the Investigato...

Countries:United StatesCanada
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Frequently asked questions about AXS-12

What is AXS-12 used for?

AXS-12 is being developed for the treatment of narcolepsy, including symptoms such as cataplexy and excessive daytime sleepiness. It is an investigational small molecule therapy that has completed Phase 3 clinical trials and is currently under review by the FDA, with an orphan drug designation for narcolepsy.

Who is developing AXS-12?

AXS-12 is being developed by Axsome Therapeutics, Inc., a biopharmaceutical company traded on the Nasdaq under the ticker symbol AXSM. Axsome is responsible for the clinical development and regulatory submission of AXS-12 for narcolepsy.

What phase is AXS-12 in?

AXS-12 has completed Phase 3 clinical development and is currently in the NDA/BLA regulatory review phase. The program includes three completed trials: two Phase 3 studies and one Phase 2 study, with a total of 179 participants enrolled across all trials.

What clinical trials is AXS-12 in?

AXS-12 has been evaluated in three completed clinical trials: the Phase 3 ENCORE study (NCT05113745), the Phase 3 study NCT05059223, and the Phase 2 CONCERT study (NCT03881852). All trials enrolled patients with narcolepsy and related symptoms such as cataplexy and excessive daytime sleepiness.

Is AXS-12 the same as reboxetine?

Yes, AXS-12 is also known as reboxetine. AXS-12 (reboxetine) is the investigational formulation being developed by Axsome Therapeutics for narcolepsy. The alternative names AXS-12 (Reboxetine) and AXS-12 (reboxetine) refer to the same drug candidate.

Does AXS-12 have orphan drug designation?

Yes, AXS-12 has received orphan drug designation from the FDA for the treatment of narcolepsy. This designation is granted to drugs intended for rare diseases or conditions, and it provides certain regulatory incentives to the developer, Axsome Therapeutics.