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Lubiprostone

Phase 3

Slow Transit Constipation | Small molecule | Gastrointestinal |Third Harmonic Bio, Inc.|Last Updated: Jan 20, 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
RandomizedACTIVE_CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment346
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT07277907Efficacy and Safety of Lubiprostone in the Treatment of Slow Transit ConstipationPHASE3 RECRUITING 346Nov 13, 2025Nov 30, 2027Jan 20, 202615 China
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Study Endpoints
Primary Endpoints
The change in spontaneous bowel movements (SBMs) frequency from baseline during the first week
From 2 weeks prior to the first dose through 4 weeks after treatment initiation

The change from baseline in the weekly average number of SBMs reported during the first week after treatment initiation

Secondary Endpoints
The percentage of patients with SBMs within 24 hours after the first intake of the study drug
Day 1 after treatment initiation
Time to first SBM occurrence after treatment initiation
Up to 4 weeks after treatment initiation
The percentage of patients reporting 3 or more SBMs/wk
From 2 weeks prior to the first dose through 4 weeks after treatment initiation
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Study Design & Arms
AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
LubiprostoneEXPERIMENTALLubiprostone is an oral bicyclic fatty acid that selectively activates type 2 chloride channels in the apical membrane of human gastrointestinal epithelial cells, thereby increasing chloride-rich fluid secretion. Although the mechanism is unclear, this may then decrease intestinal transit time, allowing the passage of stool and alleviating symptoms of constipation.
Polyethylene GlycolACTIVE_COMPARATORPolyethylene glycol (PEG ) is an established osmotic laxative, widely available worldwide for the treatment of functional constipation in adults and children.
Interventions
NameTypeDescription
LubiprostoneDRUGPatients were instructed to orally ingest Lubiprostone Soft Capsules (provided by Nanjing Chia-Tai Tianqing Pharmaceutical Company) at a dose of 24 μg twice daily with food and water during breakfast and dinner. The capsules must be swallowed whole without splitting or chewing. The treatment duration was 4 weeks, and medication adherence was monitored through patient diaries and pill count of returned medication.
Polyethylene glycol (PEG )DRUGSubjects in the control group will receive the standard treatment of polyethylene glycol 4000 powder at a dosage of 10 g, twice daily. Each dose will be dissolved in 200-250 mL of water and administered orally for 4 weeks.
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites15

Inclusion Criteria: 1. Patients voluntarily participated in the study and provided signed informed consent; 2. Met the Rome IV diagnostic criteria for functional constipation; 3. Had fewer than 3 spontaneous bowel movements (SBMs) per week; 4. More than 20% the radio-paque markers localized in the ...

Countries:China
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Recent Changes (Last 90 Days)
LOWMay 24, 2026NCT07277907studyFirstPostDate: changed