Windtree Therapeutics, Inc. ("Windtree" or the "Company") (NasdaqCM: WINT), a biotechnology company focused on advancing early and late-stage innovative therapies for critical conditions and diseases, today announced the issuance of an istaroxime patent for Japan. The patent is entitled, "Istaroxime-containing intravenous formulation for the treatment of heart failure (AHF)." The claims are directed to intravenous administration of istaroxime using increased infusion times alone or in combination with other agents useful to treat AHF, thereby improving treatment of heart failure and diastolic relaxation when compared to conventional protocols. The application has been accorded Patent No. 7560134 with a registration date of September 24, 2024 and will expire in 2039.

Istaroxime is a novel first-in-class investigational therapy that is intended to improve systolic contraction and diastolic relaxation of the heart while also increasing blood pressure and maintaining renal function with a generally favorable safety profile. Istaroxime has been studied in four positive Phase 2 trials enrolling patients with acute heart failure and early cardiogenic shock due to heart failure.