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MHS-1031

Phase 2

Gastroesophageal Reflux | Small molecule | Gastrointestinal |Catalyst Pharmaceuticals, Inc.|Last Updated: Mar 25, 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
RandomizedDouble-BlindPLACEBO_CONTROLLEDBiomarker
Total Trials1
Total Enrollment247
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT05556824Multi-Center Study of Panosyl-Isomaltooligosaccharides Adjunctive to PPI Therapy to Treat GERDPHASE2 ACTIVE NOT_RECRUITING 247Mar 3, 2023May 1, 2026Mar 25, 202618 United States
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Study Endpoints
Primary Endpoints
Heartburn-free days/week
4 and 8 weeks

The difference between baseline weekly average heartburn-free days and weekly average heartburn-free days during Treatment Phase Weeks 1-4 and Weeks 5-8 (as measured using questions 1, 2 and 3 of the Reflux Symptom Questionnaire Electronic Diary) (RESQ-eD).

Secondary Endpoints
Heartburn symptom severity
4 and 8 weeks
Heartburn-free day satisfaction
4 and 8 weeks
GERD-related severity satisfaction
4 and 8 weeks
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Study Design & Arms
AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Drug ProductACTIVE_COMPARATORPanosyl-isomaltooligosaccharide (PIMO) liquid 1 g (1.5 ml) per day for 8 weeks
PlaceboPLACEBO_COMPARATORPlacebo liquid (1.5 ml) per day for 8 weeks
Interventions
NameTypeDescription
MHS-1031DRUGStudy medication will be supplied as a syrup in individual sachets containing 1g (1.5 mL) of MHS-1031. Subjects will be randomized in 2:1 fashion to either study drug (2) or placebo (1)
PlaceboOTHERMatching placebo is an oral solution formulated to have a degree of sweetness and acidity similar to the study medication and will be provided in equivalent sachets containing 1.5g (1.5 mL) of the oral placebo solution.
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Eligibility Criteria
Age Range18 Years — 75 Years
SexALL
Healthy VolunteersNo
Study Sites18

Inclusion Criteria: * In the opinion of the investigator or sub-investigators, the subject is capable of understanding and complying with protocol requirements, including compliance with completing nightly online questionnaires in one of the IRB-approved languages. * Subject signs and dates an elec...

Countries:United States
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Recent Changes (Last 90 Days)
LOWMay 24, 2026NCT05556824studyFirstPostDate: changed