Tonix Pharmaceuticals Advances TNX-2900 for Prader-Willi Syndrome Into Phase 2 Clinical Trial

Tonix Pharmaceuticals has received FDA clearance to begin Phase 2 trials for TNX-2900, a potential treatment for Prader-Willi syndrome, marking significant progress for a rare genetic disorder that causes life-threatening childhood obesity.

September 30, 2025
Tonix Pharmaceuticals Advances TNX-2900 for Prader-Willi Syndrome Into Phase 2 Clinical Trial

The U.S. Food and Drug Administration has cleared Tonix Pharmaceuticals Holding Corp.'s Investigational New Drug application for TNX-2900, allowing the company to advance its proprietary magnesium-potentiated intranasal oxytocin formulation into Phase 2 clinical trials for Prader-Willi syndrome. This rare genetic disorder represents a leading cause of life-threatening childhood obesity, making this development particularly significant for patients and families affected by the condition.

The TNX-2900 program has received both Orphan Drug and Rare Pediatric Disease designations from regulatory authorities, providing Tonix Pharmaceuticals with important regulatory benefits and incentives. These designations make the company eligible for a transferable Priority Review Voucher upon approval of the treatment, which could accelerate future drug development efforts. The company's progress with TNX-2900 represents an important step forward in addressing the substantial unmet medical needs of Prader-Willi syndrome patients.

Tonix Pharmaceuticals operates as a commercial-stage, fully-integrated biotechnology company with both marketed products and a pipeline of development candidates. The company recently achieved a significant milestone with FDA approval for Tonmya, a first-in-class, non-opioid analgesic medicine for fibromyalgia treatment. This marked the first approval for a new prescription medicine for fibromyalgia in more than 15 years, demonstrating the company's capability to bring innovative treatments to market.

Beyond TNX-2900, Tonix maintains a diverse development portfolio focused on central nervous system disorders, immunology, immuno-oncology and infectious diseases. The company's immunology development portfolio includes biologics designed to address organ transplant rejection, autoimmunity and cancer. Further information about Tonix's development programs and corporate updates can be found at https://www.tonixpharma.com.

The advancement of TNX-2900 into Phase 2 trials represents an important development in the rare disease treatment landscape. For investors and stakeholders following the company's progress, the latest news and updates relating to TNXP are available through the company's newsroom at https://ibn.fm/TNXP. The progress in Prader-Willi syndrome treatment development highlights the ongoing innovation in addressing rare genetic disorders that have historically received limited research attention and treatment options.