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cleminorexton

Phase 2

Narcolepsy Type 1 | Small molecule | Other |Centessa Pharmaceuticals plc|Last Updated: Jun 8, 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_CONTROLLED
Total Trials1
Total Enrollment222
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT07598708A Study to Investigate the Effects of Cleminorexton Compared With Placebo in the Treatment of Participants With Central Disorders of HypersomnolencePHASE2 RECRUITING 222May 15, 2026Dec 31, 2027Jun 8, 20262 United States
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Study Endpoints
Primary Endpoints
Change from baseline in mean sleep latency (average of the first 4 trials) on the Maintenance of Wakefulness Test (MWT)
Baseline to week 12
Secondary Endpoints
Change from baseline in Epworth Sleepiness Scale (ESS) total score
Baseline to Week 12
Weekly Cataplexy Rate (WCR)
Week 12
Change from baseline in Narcolepsy Severity Scale for Clinical Trials (NSS-CT)
Baseline to Week 12
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Study Design & Arms
AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Group A - Narcolepsy Type 1 (Dose 1)EXPERIMENTAL -
Group A - Narcolepsy Type 1 (Dose 2)EXPERIMENTAL -
Group A - Narcolepsy Type 1 (placebo)PLACEBO_COMPARATOR -
Group B - Narcolepsy Type 2 (Dose 1)EXPERIMENTAL -
Group B - Narcolepsy Type 2 (Dose 2)EXPERIMENTAL -
Group B - Narcolepsy Type 2 (placebo)PLACEBO_COMPARATOR -
Interventions
NameTypeDescription
cleminorextonDRUGOral cleminorexton capsule
PlaceboDRUGmatching placebo capsule
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Eligibility Criteria
Age Range18 Years — 70 Years
SexALL
Healthy VolunteersNo
Study Sites2

Key Inclusion Criteria: * 18-70 years of age * Body Mass Index (BMI) within the range ≥ 17.0 and ≤ 45 kg/m\^2 (inclusive) * Meets the diagnostic criteria of Narcolepsy Type 1 (NT1) or Type 2 (NT2) according to International Classification of Sleep Disorders, 3rd edition, Text Revision edition (ICSD...

Countries:United States
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Recent Changes (Last 90 Days)
LOWJun 8, 2026NCT07598708lastUpdatePostDate: changed
LOWJun 8, 2026NCT07598708lastUpdatePostDate: changed
LOWJun 8, 2026NCT07598708lastUpdatePostDate: changed
LOWJun 4, 2026NCT07598708Status: NOT_YET_RECRUITING → RECRUITING
LOWJun 4, 2026NCT07598708Status: NOT_YET_RECRUITING → RECRUITING
LOWJun 4, 2026NCT07598708Status: NOT_YET_RECRUITING → RECRUITING
LOWJun 4, 2026NCT07598708Status: NOT_YET_RECRUITING → RECRUITING
LOWJun 4, 2026NCT07598708Status: NOT_YET_RECRUITING → RECRUITING
LOWMay 24, 2026NCT07598708studyFirstPostDate: changed
LOWMay 21, 2026NCT07598708NEW_TRIAL: changed
LOWMay 21, 2026NCT07598708NEW_TRIAL: changed