Glyburide

Amglidia® has been approved by the European Medicines Agency (EMA) and is commercially available in EuropeStrong strategic fit with Eton’s existing pediatric endocrinology focusAmglidia has been granted Orphan Drug Designation by the U.S. Food and Drug Administration (FDA)Potential New Drug Application (NDA) submission in 2026 DEER PARK, Ill., Nov. 25, 2024 (GLOBE NEWSWIRE) -- Eton Pharmaceuticals, Inc (“Eton” or the “Company”) (Nasdaq: ETON), an innovative pharmaceutical company focused on developing and commercializing treatments for rare diseases, today announced that it has acquired the U.S. rights to Amglidia (glyburide oral suspension, known as glibenclamide in Europe) for the treatment of neonatal diabetes mellitus from AMMTeK. “This exciting transaction adds another attractive, patented product candidate to our growing pediatric endocrinology portfolio. In addition, the product aligns with Eton’s expertise and wealth of experience in bringing to market liquid and precision dose formulations for pediatric patients,” said Sean Brynjelsen, CEO of Eton Pharmaceuticals. “Currently, there are no FDA-approved oral treatments for neonatal diabetes mellitus. Amglidia has been used successfully to treat European patients for years, and families and pediatric endocrinologists have expressed to us the significant need for this treatment in the United States. We look forward to working with AMMTeK to bring the product to U.S. patients as quickly as possible,” concluded Brynjelsen. Amglidia is a proprietary, patented liquid product that was developed for the treatment of neonatal diabetes mellitus by AMMTeK, a French biotechnology company. The product was approved by the EMA in 2018. The product has already been granted Orphan Drug Designation by the U.S. FDA. Neonatal diabetes mellitus is a rare condition estimated to impact approximately 300 patients in the United States. Currently, there are no FDA-approved oral treatment options and as a result, U.S. patients frequently either rely on compounded products that are not FDA-approved or administer products off-label by making homemade suspensions. AMMTeK has conducted a post-approval study tracking five years of real-world safety and efficacy in European patients, which will be used to support Eton’s NDA submission. Eton plans to hold a meeting with the FDA in the first quarter of 2025 and anticipates submitting an NDA for the product in 2026. About Eton Pharmaceuticals Eton is an innovative pharmaceutical company focused on developing and commercializing treatments for rare diseases. The Company currently has five commercial rare disease products: ALKINDI SPRINKLE®, PKU GOLIKE®, Carglumic Acid, Betaine Anhydrous, and Nitisinone. The Company has three additional product candidates in late-stage development: ET-400, ET-600, and ZENEO® hydrocortisone autoinjector. For more information, please visit our website at www.etonpharma.com. Forward-Looking Statements Statements contained in this press release regarding matters that are not historical facts are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995, including statements associated with the expected ability of Eton to undertake certain activities and accomplish certain goals and objectives. These statements include but are not limited to statements regarding Eton’s business strategy, Eton’s plans to develop and commercialize its product candidates, the safety and efficacy of Eton’s product candidates, Eton’s plans and expected timing with respect to regulatory filings and approvals, and the size and growth potential of the markets for Eton’s product candidates. Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Words such as “believes,” “anticipates,” “plans,” “expects,” “intends,” “will,” “goal,” “potential” and similar expressions are intended to identify forward-looking statements. These forward-looking statements are based upon Eton’s current expectations and involve assumptions that may never materialize or may prove to be incorrect. Actual results and the timing of events could differ materially from those anticipated in such forward-looking statements as a result of various risks and uncertainties, which include, without limitation, risks associated with the process of discovering, developing and commercializing drugs that are safe and effective for use as human therapeutics, and in the endeavor of building a business around such drugs. These and other risks concerning Eton’s development programs and financial position are described in additional detail in Eton’s filings with the Securities and Exchange Commission. All forward-looking statements contained in this press release speak only as of the date on which they were made. Eton undertakes no obligation to update such statements to reflect events that occur or circumstances that exist after the date on which they were made. Investor Relations:Lisa M. Wilson, In-Site Communications, Inc.T: 212-452-2793E: lwilson@insitecony.com

Neonatal diabetes mellitus affects an estimated 300 individuals in the US. Credit: July Semianovich/Shutterstock. Eton Pharmaceuticals has acquired the US rights to Amglidia, a treatment developed for neonatal diabetes mellitus, from France-based biotechnology company AMMTeK. Amglidia, also known as glibenclamide in Europe, is a patented liquid product and was approved by the European Medicines Agency in 2018. The move is set to align with Eton Pharmaceuticals’ focus on paediatric endocrinology. The product also holds an orphan drug designation from the US Food and Drug Administration (FDA). AMMTeK’s post-approval study, which includes five years of real-world data on efficacy and safety from European subjects, is set to back Eton Pharmaceuticals’ new drug application submission. Eton Pharmaceuticals plans to meet with the FDA in the first quarter of 2025 and submit the NDA in 2026. Eton Pharmaceuticals CEO Sean Brynjelsen stated: “This exciting transaction adds another attractive, patented product candidate to our growing paediatric endocrinology portfolio. “The product aligns with Eton’s expertise and wealth of experience in bringing to market liquid and precision dose formulations for paediatric patients. Currently, there are no FDA-approved oral treatments for neonatal diabetes mellitus. “Amglidia has been used successfully to treat European patients for years, and families and paediatric endocrinologists have expressed to us the significant need for this treatment.” Neonatal diabetes mellitus affects an estimated 300 individuals in the US. Eton Pharmaceuticals acquired the US rights to PKU GOLIKE from Relief Therapeutics in March 2024. PKU GOLIKE is a medical formula product for the dietary management of phenylketonuria (PKU), using patented Physiomimic technology. In November 2021, the FDA approved Eton Pharmaceuticals and Azurity Pharmaceuticals’ Eprontia (topiramate) oral solution for seizures and migraine treatment.