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elsunersen

Phase 3

Epileptic Encephalopathy | Small molecule | Neurology |Praxis Precision Medicines, Inc.|Last Updated: Aug 3, 2026

Target and mechanism

Target class-Sen (Aso)
ModalitySmall molecule

Also known as 1mg elsunersen

Success Probability

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Market & Valuation

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Trial Design

CONTROLLEDDMC
Total Trials1
Total Enrollment40

FDA Designations

BREAKTHROUGH_THERAPYORPHAN_DRUGRARE_PEDIATRIC_DISEASE

Clinical trial landscape

elsunersen · 1 trial · 2 indications

Phase 3 1
NCT07019922A Clinical Trial of Elsunersen in Pediatric SCN2A-DEE to Assess Efficacy and SafetyEpileptic Encephalopathy
RECRUITING40 Analytics
PHASE3RECRUITING
A Clinical Trial of Elsunersen in Pediatric SCN2A-DEE to Assess Efficacy and Safety
Epileptic EncephalopathyUnlock trial analytics

Study Endpoints

Primary Endpoints

To assess the efficacy of elsunersen on seizure frequency in participants with early-onset SCN2A DEE
24 weeks

Median percent change in monthly (28 days) motor seizure frequency from baseline to treatment after 24 weeks

Secondary Endpoints

To assess secondary efficacy outcomes of elsunersen in participants with early-onset SCN2A DEE
24 weeks
CGI-S change from baseline
24 weeks
CGI subdomain scores at each postdose time point
24 weeks
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Cohort 1 Arm 1: Open-Label Treatment PeriodEXPERIMENTALOpen-label elsunersen
Cohort 2: Open-Label Treatment PeriodEXPERIMENTALOpen-label elsunersen
Cohort 3: Open-Label Treatment PeriodEXPERIMENTALOpen-label elsunersen

Interventions

NameTypeDescription
1mg elsunersenDRUG24 weeks every 4 weeks intrathecally
0.5mg elsunersenDRUG24 weeks every 4 weeks intrathecally
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Eligibility Criteria

Age Range1 Day to 18 Years
SexALL
Healthy VolunteersNo
Study Sites10

Inclusion Criteria: * Has a documented Gain of Function SCN2A variant confirmed through genetic testing. * Has onset of seizures prior to 3 months of age. * Seizure frequency of 4 or more countable motor seizures per 28-day during the Baseline Observation Period. Exclusion Criteria: * Has any cli...

Countries:United StatesBrazilGermanyItaly
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Recent Changes (Last 90 Days)

MEDIUMAug 3, 2026NCT07019922primaryCompletionDate: changed
MEDIUMAug 3, 2026NCT07019922primaryCompletionDate: changed

Frequently asked questions about elsunersen

What is elsunersen used for?

Elsunersen is an investigational small molecule being developed for epileptic encephalopathy, specifically SCN2A developmental and epileptic encephalopathy (DEE). It is a -sen class antisense oligonucleotide (ASO) therapy. The drug is currently in Phase 3 clinical development and has not been approved by the FDA.

What does elsunersen target?

Elsunersen is an antisense oligonucleotide (ASO), a class of therapy that targets RNA to modulate gene expression. It is being studied in patients with SCN2A encephalopathy, a genetic form of epileptic encephalopathy. The drug is designed to address the underlying genetic cause of this condition.

Who is developing elsunersen?

Elsunersen is being developed by Praxis Precision Medicines, Inc., a biopharmaceutical company traded on the NASDAQ under the ticker symbol PRAX. The company is conducting a Phase 3 clinical trial of elsunersen in pediatric patients with SCN2A developmental and epileptic encephalopathy.

What phase is elsunersen in?

Elsunersen is currently in Phase 3 clinical development. It is an investigational drug and has not been approved by the FDA. The drug has received Breakthrough Therapy, Orphan Drug, and Rare Pediatric Disease designations from the FDA for its intended use in epileptic encephalopathy.

What clinical trials is elsunersen in?

Elsunersen is being evaluated in a Phase 3 clinical trial registered as NCT07019922, titled 'A Clinical Trial of Elsunersen in Pediatric SCN2A-DEE to Assess Efficacy and Safety.' The trial is currently recruiting participants in the United States, Brazil, Germany, and Italy, with an enrollment target of 40 patients.

Is elsunersen the same as 1mg elsunersen?

Yes, elsunersen is also known as 1mg elsunersen. This alternative name may be used in some contexts to refer to the same investigational drug. The drug is being developed by Praxis Precision Medicines for the treatment of SCN2A developmental and epileptic encephalopathy.