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AMX0035

Phase 3

Amyotrophic Lateral Sclerosis | Small molecule | Neurology |Amylyx Pharmaceuticals, Inc.|Last Updated: Aug 13, 2025

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
RandomizedDouble-BlindPLACEBO_CONTROLLEDDMCBiomarker
Total Trials5
Total Enrollment1,271
FDA Designations
No designations recorded
Clinical Trials (5)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT05619783Extension Study Evaluating The Safety And Tolerability of AMX0035PHASE3 COMPLETED 352Dec 29, 2022Oct 30, 2024Jan 13, 202546 Belgium, France +9
NCT05021536Phase III Trial of AMX0035 for Amyotrophic Lateral Sclerosis TreatmentPHASE3 ACTIVE NOT_RECRUITING 664Oct 28, 2021Jan 1, 2026Aug 14, 202469 United States, Belgium +10
NCT04516096A Compassionate Use Protocol of AMX0035 for Treatment of Patients With Amyotrophic Lateral Sclerosis (ALS)PHASE2 COMPLETED 28Nov 22, 2020Jan 31, 2023Apr 7, 20235 United States
NCT03488524Open Label Extension Study of AMX0035 in Patients With ALSPHASE2 COMPLETED 90Mar 29, 2018Mar 1, 2021Aug 13, 202524 United States
NCT03127514AMX0035 in Patients With Amyotrophic Lateral Sclerosis (ALS)PHASE2 COMPLETED 137Jun 22, 2017Nov 24, 2019May 16, 202425 United States
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Study Endpoints
Primary Endpoints
To assess the Incidence of Treatment-Emergent Adverse Events during treatment with AMX0035
108 weeks

Incidence of all adverse events (AE)s; AEs leading to treatment discontinuation or study withdrawal, and all serious adverse events (SAE)s in participants treated with AMX0035

Amyotrophic Lateral Sclerosis Functional Rating Scale-Revised (ALSFRS-R) Slope Change
48 weeks

Change in slope of Amyotrophic Lateral Sclerosis Functional Rating Scale-Revised (ALSFRS-R) over treatment duration. The ALSFRS-R consists of 12 items across 4 subdomains of function (bulbar, fine motor, gross motor, and breathing) with each item scored on a scale from 0 (total loss of function) to 4 (no loss of function). Total scores range from 0 to 48, with higher scores indicating better function.

Treatment emergent Adverse Events
Through study completion an average of 1 year

Rate of treatment emergent adverse events during AMX0035 therapy

Number of Participants With Treatment-Emergent Adverse Events (TEAEs)
From the Baseline Visit in the OLE study through Week 132 or the Early Discontinuation (Final Safety) Visit for each participant (for up to approximately 132 weeks)

Number of participants with TEAEs from baseline in the OLE study through the last participant's last visit in the OLE

Number of Participants With Adverse Events
24 Weeks

Comparison Between Groups of Number of Participants With Adverse Events Until Planned Completion

Number of Participants in Each Group Able to Remain on Study Drug Until Planned Discontinuation
24 weeks

A comparison of the number of participants in each group able to remain on study drug until planned discontinuation between groups

Secondary Endpoints
To assess the impact of long-term treatment with AMX0035 on survival
108 weeks
Participant Quality of Life (QOL)
48 weeks
Assess Long-Term Survival
3 years from LPI
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Study Design & Arms
AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
ActiveEXPERIMENTALAll participants will be treated with oral (or feeding tube) AMX0035 (a fixed-dose combination of Sodium Phenylbutyrate (PB) and taurursodiol). All participants will take 2 sachets daily (one morning dose and one evening dose) starting on Day 1, for the duration of the study (if twice a day dosing is poorly tolerated, dosing interruptions and reductions are further discussed in section 6.3) AMX0035 will be supplied by Amylyx as a carton box containing approximately 1 month supply of single use sachets. Each AMX0035 sachet contains active ingredients in a powder formulation with 3 g PB and 1 g taurursodiol. AMX0035 powder is mixed with water and taken orally (or via feeding tube).
PlaceboPLACEBO_COMPARATORPlacebo administered by mouth or via feeding tube for 48 weeks: once daily for first 3 weeks and then twice daily for remainder of study if participant tolerating
AMX0035EXPERIMENTALPlacebo administered by mouth or via feeding tube for 48 weeks: once daily for first 3 weeks and then twice daily for remainder of study if participant tolerating
AMX-0035 long term treatment extensionEXPERIMENTALAMX0035 administered twice daily p.o.
Interventions
NameTypeDescription
AMX0035DRUGCombination of 3 g phenylbutyrate and 1 g taurursodiol
PlaceboOTHERMatching Placebo Comparator
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites46

Inclusion Criteria: 1. Previous participation in Study A35-004 (PHOENIX), including completion of the randomized controlled phase through Week 48 (this timepoint may be upcoming at the time of screening). Participants who do not complete randomized-controlled phase through Week 48 for medical reaso...

Countries:BelgiumFranceGermanyIrelandItalyNetherlandsPolandPortugalSpainSwedenUnited KingdomUnited States
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT05021536primaryCompletionDate: changed
LOWMay 24, 2026NCT05021536studyFirstPostDate: changed