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flag Relief Therapeutics reports its new liquid sapropterin therapy is safe and effective for PKU, with an FDA submission planned for early 2026.

flag Relief Therapeutics has announced positive results from a pivotal study showing its new liquid sapropterin formulation, RLF-OD032, is bioequivalent to KUVAN® Powder for treating phenylketonuria (PKU). flag The ready-to-use, highly concentrated liquid requires no mixing with water and reduces dose volume by up to 100-fold, potentially improving adherence, especially in children. flag The treatment was well tolerated with no serious side effects. flag The company plans to submit a 505(b)(2) New Drug Application to the FDA in early 2026, seeking approval for the first portable, ready-to-use liquid sapropterin therapy. flag If approved, RLF-OD032 could offer a major improvement in treatment convenience and quality of life for PKU patients, with patent protection expected through at least 2043.

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