Stealth BioTherapeutics Announces FDA Accelerated Approval of FORZINITY™ (elamipretide HCl), the First Therapy for Progressive and Life-limiting Ultra-rare Genetic Disease Barth Syndrome

NEEDHAM, Mass. , Sept. 19, 2025 /PRNewswire/ -- Stealth BioTherapeutics Inc. (the "Company" or "Stealth"), a commercial-stage biotechnology company focused on the discovery, development and commercialization of novel therapies for diseases involving mitochondrial dysfunction, today announced that the U.S. Food and Drug Administration (FDA) has granted accelerated approval to FORZINITY™ (elamipretide HCl) to improve muscle strength in adult and pediatric patients with Barth syndrome weighing at least 30 kilograms (kg) (approximately 66 pounds).