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Sepiapterin

Phase 3

Phenylketonuria | Small molecule | Metabolic |PTC Therapeutics, Inc.|Last Updated: Aug 28, 2026

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLEDDMC
Total Trials1
Total Enrollment56

FDA Designations

No designations recorded

Clinical trial landscape

Sepiapterin · 1 trial · 1 indication

Phase 3 1
NCT06302348A Study of Sepiapterin in Participants With Phenylketonuria (PKU)Phenylketonuria
RECRUITING56 Analytics
PHASE3RECRUITING
A Study of Sepiapterin in Participants With Phenylketonuria (PKU)
PhenylketonuriaUnlock trial analytics

Study Endpoints

Primary Endpoints

Mean Change From Baseline in Full-scale Intelligence Quotient (FSIQ) Wechsler Preschool and Primary Scale of Intelligence - Fourth Edition (WPPSI-IV) Score
Baseline, Year 2

Analysis for participants ≥30 months to \<6 years of age.

Mean Change From Baseline in FSIQ Wechsler Intelligence Scale for Children - Fifth Edition (WISC-V) Score
Baseline, Year 2

Analysis for participants ≥6 years to 16 years of age.

Secondary Endpoints

Change From Baseline in Phenylketonuria-Quality of Life (PKU-QOL) Questionnaire Score
Baseline up to 4 years
Change From Baseline in the European Quality of Life - 5 Dimensions (EQ-5D) Score
Baseline up to 4 years
Mean Change From Baseline in FSIQ (WPPSI-IV) Score
Baseline, Year 4
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
SepiapterinEXPERIMENTALParticipants will receive age- and weight-adjusted doses of sepiapterin orally once daily for up to 6 years.

Interventions

NameTypeDescription
SepiapterinDRUGSepiapterin powder for oral use will be mixed in water or apple juice prior to administration.
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Eligibility Criteria

Age RangeN/A to 9 Years
SexALL
Healthy VolunteersNo
Study Sites10

Key Inclusion Criteria: For all participants: * Women of childbearing potential must have a negative pregnancy test at Screening and agree to abstinence or the use of at least one highly effective form of contraception for the duration of the study, and for at least 90 days after the last dose of ...

Countries:United StatesAustraliaFranceIrelandPolandUnited Kingdom
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Competitive Landscape -Phenylketonuria 12 trials

Recent Changes (Last 90 Days)

LOWAug 28, 2026NCT06302348lastUpdatePostDate: changed
LOWAug 28, 2026NCT06302348lastUpdatePostDate: changed
LOWJul 24, 2026NCT06302348lastUpdatePostDate: changed
LOWJul 24, 2026NCT06302348lastUpdatePostDate: changed
LOWJun 18, 2026NCT06302348lastUpdatePostDate: changed
LOWJun 18, 2026NCT06302348lastUpdatePostDate: changed
LOWJun 18, 2026NCT06302348lastUpdatePostDate: changed
LOWJun 18, 2026NCT06302348lastUpdatePostDate: changed

Frequently asked questions about Sepiapterin

What is Sepiapterin used for?

Sepiapterin is an investigational small molecule being developed for the treatment of phenylketonuria (PKU), a metabolic disorder. It is currently in Phase 3 clinical development and has not been approved by regulatory authorities.

Who makes Sepiapterin?

Sepiapterin is being developed by PTC Therapeutics, Inc., a biopharmaceutical company traded on NASDAQ under the ticker symbol PTCT. The company is conducting a Phase 3 clinical trial to evaluate the drug in patients with phenylketonuria.

What phase is Sepiapterin in?

Sepiapterin is currently in Phase 3 clinical development. It is an investigational drug and has not been approved for any use. The ongoing Phase 3 study is actively recruiting participants with phenylketonuria.

What clinical trials is Sepiapterin in?

Sepiapterin is being evaluated in a Phase 3 clinical trial registered as NCT06302348, titled "A Study of Sepiapterin in Participants With Phenylketonuria (PKU)." The trial is currently recruiting and aims to enroll 56 participants across the United States, Australia, France, Ireland, Poland, and the United Kingdom.

Is Sepiapterin the same as any other drug?

Sepiapterin is the primary name used for this investigational drug in clinical development. No alternative names have been reported for this compound in the available clinical trial information.