Tonix Pharma Announces FDA Clears IND Application To Support Clinical Development Of TNX-102 SL 5.6 Mg For Treatment Of Major Depressive Disorder In Adults

Tonix plans to initiate potential pivotal Phase 2 HORIZON study of TNX-102 SL in adults with major depressive disorder in mid-2026

More than 21 million US adults experience a major depressive episode each year

CHATHAM, N.J., Nov. 24, 2025 (GLOBE NEWSWIRE) -- Tonix Pharmaceuticals Holding Corp. (NASDAQ:TNXP) ("Tonix" or the "Company"), a fully-integrated commercial biotechnology company, today announced the U.S. Food and Drug Administration (FDA) has cleared the Investigational New Drug (IND) application to support clinical development of TNX-102 SL (cyclobenzaprine HCl sublingual tablets) 5.6 mg for the treatment of major depressive disorder (MDD) in adults.

The IND clearance enables Tonix to proceed with the potentially pivotal Phase 2 HORIZON study, a 6-week, randomized, double-blind, placebo-controlled study of TNX-102 SL as a first-line monotherapy in adults with MDD. About 360 patients will be enrolled at approximately 30 U.S. sites. Eligible participants are 18 years or older and currently experiencing a moderate to severe major depressive episode. The study will compare TNX-102 SL 5.6 mg, taken sublingually at bedtime to placebo, with the primary endpoint being the MADRS total score change from baseline at Week 6. Secondary endpoints include global impression scores, anxiety ratings, and measures of sleep disturbance. Tonix plans to initiate enrollment of the study in mid-year 2026.