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OG-6219

Phase 2

Endometriosis | Small molecule | Endocrine |Organon & Co.|Last Updated: May 8, 2026

Success Probability

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment354

FDA Designations

No designations recorded

Clinical trial landscape

OG-6219 · 1 trial · 1 indication

Phase 2 1
NCT05560646A Study to Investigate Efficacy and Safety of OG-6219 BID in 3 Dose Levels Compared With Placebo in Participants Aged 18 to 49 With Moderate to Severe Endometriosis-related PainEndometriosis
COMPLETED354 Analytics
PHASE2COMPLETED
A Study to Investigate Efficacy and Safety of OG-6219 BID in 3 Dose Levels Compared With Placebo in Participants Aged 18 to 49 With Moderate to Severe Endometriosis-related Pain
EndometriosisUnlock trial analytics

Study Endpoints

Primary Endpoints

Change From Baseline Cycle in Mean Overall Pelvic Pain Score at Treatment Cycle 3
Baseline Cycle (up to Day -28) and Treatment Cycle 3 (Day 95). Each cycle was referred to 1 menstrual cycle (approximately 21 to 32 days).

Participants completed eDiary items for severity of their pain over the last 24 hours on 11-point NRS for dysmenorrhea or NMPP, and dyspareunia. Each item of the NRS pain severity score ranged from 0 (no pain) to 10 (worst pain imaginable), where lower score indicated a better outcome. The mean OPP score was derived by the pain score for the dysmenorrhea and NMPP items, and score ranged from 0 (no pain) to 10 (worst pain imaginable), where lower score indicated a better outcome. Baseline cycle OPP score was defined as the average daily OPP during baseline cycle.

Percentage of Participants With Treatment-Emergent Adverse Events (TEAEs) and Treatment-Emergent Serious Adverse Events (TESAEs)
From the first dose administration of the study drug (Day 1) up to 14 days after the last dose of study drug administration, approximately 108 days

An adverse event (AE) was defined as any untoward medical occurrence in a clinical study participant administered an investigational product and which does not necessarily have a causal relationship with this treatment. An SAE was defined as any AE that at any dose resulted in death, was life-threatening, required inpatient hospitalization or prolongation of existing hospitalization, resulted in persistent or significant disability/incapacity, was a congenital anomaly/birth defect, or was an important medical event. TEAEs were defined as events that first occur or worsen (increase in severity) after the first dose of study drug, during the treatment period, and up to 14 days (inclusive) after the last dose of study drug administration. Percentages are rounded off to the hundredth decimal place.

Percentage of Participants With Treatment-Emergent Adverse Events Leading to Study Treatment Discontinuation
From the first dose administration of the study drug (Day 1) up to 14 days after the last dose of study drug administration, approximately 108 days

An AE was defined as any untoward medical occurrence in a clinical study participant administered an investigational product and which does not necessarily have a causal relationship with this treatment. TEAEs were defined as events that first occur or worsen (increase in severity) after the first dose of study drug, during the treatment period, and up to 14 days (inclusive) after the last dose of study drug administration. The TEAEs leading to permanent discontinuation of study drug was identified by using the 'Action taken with study treatment' variable equal to 'Drug withdrawal' from the AE page of the electronic case report form. Percentages are rounded off to the hundredth decimal place.

Secondary Endpoints

Change From Baseline Cycle in Mean Dysmenorrhea Score at Treatment Cycle 3
Baseline Cycle (up to Day -28) and Treatment Cycle 3 (Day 95). Each cycle was referred to 1 menstrual cycle (approximately 21 to 32 days).
Change From Baseline Cycle in Mean Non-Menstrual Pelvic Pain Score at Treatment Cycle 3
Baseline Cycle (up to Day -28) and Treatment Cycle 3 (Day 95). Each cycle was referred to 1 menstrual cycle (approximately 21 to 32 days).
Change From Baseline Cycle in Mean Dyspareunia Score at Treatment Cycle 3
Baseline Cycle (up to Day -28) and Treatment Cycle 3 (Day 95). Each cycle was referred to 1 menstrual cycle (approximately 21 to 32 days).
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Group A: OG-6219 Dose 1EXPERIMENTALGroup A: OG-6219 Dose 1 BID
Group B: OG-6219 Dose 2EXPERIMENTALGroup B: OG-6219 Dose 2 BID
Group C: OG-6219 Dose 3EXPERIMENTALGroup C: OG-6219 Dose 3 BID
Group D: PlaceboPLACEBO_COMPARATORGroup D: Placebo BID

Interventions

NameTypeDescription
OG-6219DRUGOG-6219 Dose 1, Dose 2, Dose 3 BID: Participants will receive (orally) OG-6219 tablets during treatment cycles.
PlaceboDRUGParticipants will receive (orally) OG-6219 Placebo tablets BID during treatment cycles.
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Eligibility Criteria

Age Range18 Years to 49 Years
SexFEMALE
Healthy VolunteersNo
Study Sites86

Inclusion Criteria: * Pre-menopausal females of age 18 to 49 years old (inclusive) at the time of signing Informed Consent (V1). * Surgically (laparoscopy or laparotomy) diagnosed with endometriosis * Moderate to severe endometriosis-related pelvic pain * Regular menstrual cycles * Is not expected ...

Countries:United StatesBelgiumBulgariaCzechiaFranceGermanyHungaryItalyLatviaPolandSweden
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Recent Changes (Last 90 Days)

MEDIUMJun 8, 2026NCT05560646TRIAL_REMOVED: changed
MEDIUMJun 8, 2026NCT05560646TRIAL_REMOVED: changed
MEDIUMJun 8, 2026NCT05560646TRIAL_REMOVED: changed
MEDIUMJun 8, 2026NCT05560646TRIAL_REMOVED: changed
MEDIUMJun 8, 2026NCT05560646TRIAL_REMOVED: changed

Frequently asked questions about OG-6219

What is OG-6219 used for?

OG-6219 is an investigational small molecule being developed for the treatment of endometriosis. It is being studied in women aged 18 to 49 with moderate to severe endometriosis-related pain. The drug is currently in Phase 2 clinical development and is not yet approved by regulatory authorities.

Who makes OG-6219?

OG-6219 is being developed by Organon & Co. (NYSE: OGN). The company is conducting clinical trials to evaluate the safety and efficacy of this investigational drug for endometriosis-related pain.

What phase is OG-6219 in?

OG-6219 is in Phase 2 clinical development. A Phase 2 trial has been completed, evaluating the drug in 354 participants with moderate to severe endometriosis-related pain. The drug is investigational and has not been approved for any use.

What clinical trials is OG-6219 in?

OG-6219 has one completed Phase 2 clinical trial, registered as NCT05560646. The study evaluated three dose levels of OG-6219 compared with placebo in 354 women aged 18 to 49 with moderate to severe endometriosis-related pain. The trial was conducted in the United States and several European countries.

Is OG-6219 FDA approved?

OG-6219 is not FDA approved. It is an investigational drug currently in Phase 2 clinical development for endometriosis-related pain. The completed Phase 2 trial evaluated its safety and efficacy, but the drug has not yet received regulatory approval.