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elsunersen

Phase 3

Epileptic Encephalopathy | Small molecule | Other |Praxis Precision Medicines, Inc.|Last Updated: May 27, 2026

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
CONTROLLEDDMC
Total Trials1
Total Enrollment40
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT07019922A Clinical Trial of Elsunersen in Pediatric SCN2A-DEE to Assess Efficacy and SafetyPHASE3 RECRUITING 40Aug 13, 2025Dec 1, 2028May 27, 202610 United States, Brazil +2
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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 — 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)
MEDIUMMay 28, 2026NCT07019922Enrollment: 50 → 40
MEDIUMMay 28, 2026NCT07019922Enrollment: 50 → 40
LOWMay 26, 2026NCT07019922primaryCompletionDate: changed
LOWMay 24, 2026NCT07019922studyFirstPostDate: changed