Recent Updates
Recently added Catalysts

AG-181

Phase 1

Phenylketonuria | Small molecule | Metabolic |Agios Pharmaceuticals, Inc.|Trials Updated: Sep 28, 2026

AG-181 development status

Highest phase Phase 1
Registered trials 2 across 1 sponsor since Feb 2024

AG-181 target and mechanism

Molecular targetPAH
ModalitySmall molecule

Success Probability

Subscribe to view

Market & Valuation

Subscribe to view

Trial Design

CONTROLLED
Total Trials1
Total Enrollment20

FDA Designations

No designations recorded

AG-181 clinical trials

AG-181 · 1 trial · 1 indication

Phase 1 1
NCT07241234A Study to Evaluate Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of AG-181 in Subjects With PhenylketonuriaPhenylketonuria
RECRUITING20 Analytics
PHASE1RECRUITING
A Study to Evaluate Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of AG-181 in Subjects With Phenylketonuria
PhenylketonuriaUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of Subjects with Adverse Events (AEs) and Serious Adverse Events (SAEs) by Type, Severity, and Relationship to the Study Drug
Up to Day 42

Secondary Endpoints

Plasma Concentration of AG-181
Up to Day 28
Maximum Concentration (Cmax) of AG-181
Up to Day 28
Time to Maximum (Peak) Concentration (Tmax) of AG-181
Up to Day 28
Unlock Study Endpoints

Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Cohort 1: AG-181EXPERIMENTALSubjects will receive AG-181 from Day 1 to Day 28.
Cohort 2 (Optional Cohort): AG-181EXPERIMENTALSubjects will receive AG-181.

Interventions

NameTypeDescription
AG-181DRUGAG-181 film-coated tablets
Unlock Study Design Details

Eligibility Criteria

Age Range18 Years to 69 Years
SexALL
Healthy VolunteersNo
Study Sites5

Key Inclusion Criteria: * Diagnosis of PKU, defined as documented presence of 2 mutant alleles in the phenylalanine hydroxylase (PAH) gene, of which at least 1 is the R408W mutation, as determined during Screening per the genotyping performed by the study central genotyping laboratory. * At least 1...

Countries:United StatesPoland
Unlock Eligibility Criteria

Competitive Landscape -Phenylketonuria 14 trials

Recent Changes (Last 90 Days)

LOWSep 28, 2026NCT07241234lastUpdatePostDate: changed
LOWSep 28, 2026NCT07241234lastUpdatePostDate: changed
LOWAug 27, 2026NCT07241234lastUpdatePostDate: changed
LOWAug 27, 2026NCT07241234lastUpdatePostDate: changed
LOWJul 30, 2026NCT07241234lastUpdatePostDate: changed
LOWJul 30, 2026NCT07241234lastUpdatePostDate: changed

Frequently asked questions about AG-181

What is AG-181 used for in phenylketonuria?

AG-181 is an investigational small molecule being developed for the treatment of phenylketonuria, a metabolic disorder. It is currently in Phase 1 clinical development and has not been approved for any indication. The Phase 1 study is enrolling adults with phenylketonuria in the United States and Poland.

What does AG-181 target?

AG-181 targets phenylalanine hydroxylase, or PAH, the enzyme that converts phenylalanine to tyrosine. In phenylketonuria, PAH activity is deficient, leading to elevated phenylalanine levels. AG-181 is designed as a small molecule directed at PAH.

Who is developing AG-181?

AG-181 is being developed by Agios Pharmaceuticals, Inc., which trades on the Nasdaq under the ticker AGIO. Agios is the sponsor of the Phase 1 clinical program evaluating the compound in phenylketonuria.

What phase is AG-181 in?

AG-181 is in Phase 1 clinical development. It is an investigational drug and has not been approved by the FDA or any other regulatory agency. The ongoing Phase 1 trial is currently recruiting participants.

What clinical trials is AG-181 in?

AG-181 is being evaluated in one active clinical trial, NCT07241234, titled A Study to Evaluate Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of AG-181 in Subjects With Phenylketonuria. The Phase 1 study is recruiting and plans to enroll 20 adults across sites in the United States and Poland.