# A Long-Term Safety Study of PTC923 in Participants With Phenylketonuria

> **NCT05166161** · PHASE3 · ACTIVE_NOT_RECRUITING · sponsor: **PTC Therapeutics** · enrollment: 200 (estimated)

## Conditions studied

- Phenylketonuria

## Interventions

- **DRUG:** PTC923

## Key facts

- **NCT ID:** NCT05166161
- **Lead sponsor:** PTC Therapeutics
- **Sponsor class:** INDUSTRY
- **Phase:** PHASE3
- **Study type:** INTERVENTIONAL
- **Status:** ACTIVE_NOT_RECRUITING
- **Start date:** 2022-02-14
- **Primary completion:** 2026-06-30
- **Final completion:** 2026-06-30
- **Target enrollment:** 200 (ESTIMATED)
- **Last updated:** 2026-04-24


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT05166161

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT05166161, "A Long-Term Safety Study of PTC923 in Participants With Phenylketonuria". Retrieved via AI Analytics 2026-05-28 from https://api.ai-analytics.org/clinical/NCT05166161. Licensed CC0.

---

*[Clinical trials dataset](/datasets/clinical-trials) · CC0 1.0*