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ADX-2191

Phase 3

Proliferative Vitreoretinopathy | Small molecule | Ophthalmology |Aldeyra Therapeutics, Inc.|Last Updated: Apr 23, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedACTIVE_CONTROLLEDDMC
Total Trials1
Total Enrollment106

FDA Designations

PRIORITY_REVIEWORPHAN_DRUG

Clinical trial landscape

ADX-2191 · 2 trials · 2 indications

Phase 3 1Phase 2 1
NCT04136366The GUARD Trial - Part 1: A Phase 3 Clinical Trial for Prevention of Proliferative VitreoretinopathyProliferative Vitreoretinopathy
COMPLETED106 Analytics
PHASE3COMPLETED
The GUARD Trial - Part 1: A Phase 3 Clinical Trial for Prevention of Proliferative Vitreoretinopathy
Proliferative VitreoretinopathyUnlock trial analytics

Study Endpoints

Primary Endpoints

Recurrent Retinal Detachment Compared to Historical Rates
Efficacy assessment period (Week 1 to Week 24)

Percentage of subjects with recurrent retinal detachments requiring reoperation compared to historical rates

Number of Subjects With Serious Adverse Events
The safety assessment period was 16 weeks.

The proportion of subjects that experience at least one serious adverse event

Secondary Endpoints

Number of Subjects With Recurrent Retinal Detachment
Efficacy assessment period (Week 1 to Week 24)
Best-corrected Visual Acuity
Efficacy assessment period (Week 1 to Week 24)
Macular Epiretinal Membrane
Week 24
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
ADX-2191 (intravitreal methotrexate 0.8%)EXPERIMENTALADX-2191 (intravitreal methotrexate 0.8%) administered over 16 weeks.
Standard surgical care procedureACTIVE_COMPARATORStandard procedure performed.
ADX-2191 Three InjectionsEXPERIMENTAL -
ADX-2191 Six InjectionsEXPERIMENTAL -

Interventions

NameTypeDescription
ADX-2191 (intravitreal methotrexate 0.8%)DRUGADX-2191 (intravitreal methotrexate 0.8%) injected 13 times over 16 weeks upon completion of pars plana vitrectomy
Standard surgical care procedureOTHERStandard surgical care performed upon completion of pars plana vitrectomy
ADX-2191DRUGMonthly intravitreal injections of ADX-2191 (400 µg in 0.05 mL) for a total of three injections. Evaluation through week 16.
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites23

Inclusion Criteria: 1. Subject is 18 years or older of any gender or race 2. Subject is undergoing pars plana vitrectomy due to recurrent retinal detachment due to proliferative vitreoretinopathy or open globe injury 3. Subject is willing and able to provide written informed consent, comply with cl...

Countries:United States
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Frequently asked questions about ADX-2191

What is ADX-2191 used for?

ADX-2191 is an investigational small molecule being developed for proliferative vitreoretinopathy and retinitis pigmentosa, both ophthalmology conditions. It is not approved and remains in clinical development.

Who makes ADX-2191?

ADX-2191 is being developed by Aldeyra Therapeutics, Inc., a biopharmaceutical company traded on the NASDAQ under the ticker ALDX.

What phase is ADX-2191 in?

ADX-2191 is in Phase 3 clinical development for proliferative vitreoretinopathy. It has received FDA priority review and orphan drug designations, but it is not yet approved.

What clinical trials is ADX-2191 in?

ADX-2191 has been studied in two completed trials. NCT04136366 was a Phase 3 trial for proliferative vitreoretinopathy with 106 participants, and NCT05392179 was a Phase 2 trial for retinitis pigmentosa with 8 participants.

Is ADX-2191 FDA approved?

ADX-2191 is not FDA approved. It is an investigational drug that has completed clinical trials, including a Phase 3 study, and has received priority review and orphan drug designations from the FDA.