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SEP 19 2025
APPROVED · 257 DAYS AGO

Stealth BioTherapeutics Forzinity (elamipretide) $STEA

for Barth syndrome (muscle strength in adults and pediatric patients ≥30 kg)

NDA · Priority Review · Orphan · Accelerated Approval

FDA granted accelerated approval to Forzinity (elamipretide) on September 19, 2025 — just ~1 month after Class 2 resubmission acceptance, well ahead of the projected Feb 15 2026 PDUFA. First-ever approved therapy for Barth syndrome and the first FDA-approved therapy for any mitochondrial disease. Approval based on improved knee extensor muscle strength (intermediate clinical endpoint) from TAZPOWER trial.

About

Barth syndrome is a rare genetic disorder that disrupts energy production in cells, leading to muscle weakness and potentially life-threatening complications. Forzinity (elamipretide) is a peptide that stabilizes the inner membrane of mitochondria, the cell's energy factories, by binding to a key lipid called cardiolipin. By supporting mitochondrial function, Forzinity may improve muscle strength and help manage the symptoms of this complex condition.

Pivotal trial

TAZPOWER Phase 2/Phase 3 completed NCT03098797

A randomized, double-blind cross over trial to evaluate the safety, efficacy, and tolerability of elamipretide in subjects with Barth syndrome.

Source: ClinicalTrials.gov

Also in development