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See the DrugPatentWatch profile for sapropterin
What conditions has sapropterin been shown to treat? Sapropterin is approved for lowering blood phenylalanine in patients with hyperphenylalaninemia caused by tetrahydrobiopterin-responsive phenylketonuria. How does it differ from dietary treatment alone? Sapropterin reduces phenylalanine levels without the strict protein restriction required by diet-only regimens, though most patients still need some dietary control. What evidence supports its use in children versus adults? Pediatric studies showed greater phenylalanine reduction and improved dietary tolerance; adult data confirm similar biochemical responses but slower gains in neurocognitive outcomes. Can it be used in patients who do not respond to the initial test dose? Only patients whose phenylalanine drops at least 20-30 % after the test dose continue therapy; non-responders receive no ongoing benefit. When does the patent for the reference product expire? The composition-of-matter patent for Kuvan expired in the United States in 2020, opening the market to generic sapropterin dihydrochloride [1]. Who makes the generic versions now available? Manufacturers including Dr. Reddy’s, Sun Pharma, and Teva market approved generics in the U.S. market. Are any new formulations or delivery methods under development? An extended-release tablet and a liquid suspension are in late-stage trials to improve adherence in younger patients. [1] https://www.drugpatentwatch.com
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