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ORX489

Phase 1

Healthy Adult Male and Female Volunteers | Small molecule | Other |Centessa Pharmaceuticals plc|Last Updated: Feb 25, 2026

Target and mechanism

Molecular targetOX2R
Target classReceptor
ModalitySmall molecule

Also known as ORX489 Tablets

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindCONTROLLEDDMC
Total Trials1
Total Enrollment212

FDA Designations

No designations recorded

Clinical trial landscape

ORX489 · 1 trial · 1 indication

Phase 1 1
NCT07413666A Study of ORX489 in Healthy Adult Participants, Aged 18 to 60 YearsHealthy Adult Male and Female Volunteers
RECRUITING212 Analytics
PHASE1RECRUITING
A Study of ORX489 in Healthy Adult Participants, Aged 18 to 60 Years
Healthy Adult Male and Female VolunteersUnlock trial analytics

Study Endpoints

Primary Endpoints

Part A
From enrollment to the Follow-Up Visit 7 days post-discharge

Incidence and severity of Treatment-Emergent Adverse Events \[Safety and Tolerability\] as assessed by AEs and SAEs of oral single ascending doses of ORX489 in healthy adult participants.

Part B
From enrollment to the Follow-Up Visit 7 days post-discharge]

Incidence and severity of Treatment-Emergent Adverse Events \[Safety and Tolerability\] as assessed by AEs and SAEs of oral single ascending doses of ORX489 in the fasted and fed states

Part C
From enrollment to the Follow-Up Visit 7 days post-discharge]

Incidence and severity of Treatment-Emergent Adverse Events \[Safety and Tolerability\] as assessed by AEs and SAEs of oral multiple ascending doses of ORX489 in healthy adult participants

Part D:
From enrollment to the Follow-Up Visit 7 days post-discharge

Incidence and severity of Treatment-Emergent Adverse Events \[Safety and Tolerability\] as assessed by AEs and SAEs of oral single oral doses of ORX489 in sleep-deprived healthy adult participants

Secondary Endpoints

Cmax
Pre-dose and multiple post-dose timepoints, up to 48 hours
Tmax
Pre-dose and multiple post-dose timepoints, up to 48 hours
AUClast
Pre-dose and multiple post-dose timepoints, up to 48 hours
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Study Design & Arms

AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Part AEXPERIMENTALSAD Study in Healthy Adults: ORX489 and Placebo
Part BEXPERIMENTALFood-effect Evaluation in Healthy Adults: ORX489
Part CEXPERIMENTALMAD Study in Healthy Adults: ORX489 and Placebo
Part DEXPERIMENTALSAD Study in Acutely Sleep-Deprived Healthy Adults: ORX489 and Placebo

Interventions

NameTypeDescription
ORX489 TabletsDRUGORX489 Tablets
Placebo TabletsOTHERPlacebo Tablets
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Eligibility Criteria

Age Range18 Years to 60 Years
SexALL
Healthy VolunteersYes
Study Sites1

Inclusion Criteria: * Healthy males or females as determined by assessments at the Screening Visit. * For Parts A, B, C, and D: Participants must be at least 18 years of age and no more than 60 years of age at the Screening Exclusion Criteria: * Presence of significant cardiac, pulmonary, gastroi...

Countries:United States
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Frequently asked questions about ORX489

What is ORX489 used for?

ORX489 is an investigational small molecule being studied in healthy adult male and female volunteers. It is currently in Phase 1 clinical development, with a single trial recruiting participants aged 18 to 60 years in the United States. The drug is not approved and remains under investigation.

What does ORX489 target?

ORX489 targets the OX2R receptor, also known as the orexin 2 receptor. As a small molecule designed to interact with this receptor, it is being evaluated in early-stage clinical trials. The specific therapeutic application is still under investigation in healthy volunteers.

Who makes ORX489?

ORX489 is being developed by Centessa Pharmaceuticals plc, a biopharmaceutical company traded on the stock exchange under the ticker CNTA. The company is conducting a Phase 1 clinical trial of ORX489 in healthy adult participants in the United States.

What phase is ORX489 in?

ORX489 is in Phase 1 clinical development. It is an investigational drug, meaning it has not been approved by regulatory authorities. The ongoing Phase 1 study is recruiting healthy adult participants to evaluate the drug's safety and tolerability.

What clinical trials is ORX489 in?

ORX489 is being studied in a single Phase 1 clinical trial with the identifier NCT07413666, titled "A Study of ORX489 in Healthy Adult Participants, Aged 18 to 60 Years." This randomized, double-blind, controlled trial is recruiting 212 healthy volunteers in the United States.

Is ORX489 the same as ORX489 Tablets?

Yes, ORX489 is also known as ORX489 Tablets. Both names refer to the same investigational drug being developed by Centessa Pharmaceuticals. The tablet formulation is currently being evaluated in a Phase 1 clinical trial in healthy adult participants.