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See the DrugPatentWatch profile for sapropterin
Factors that influence sapropterin dosing decisions start with a patient's tetrahydrobiopterin (BH4) responsiveness test. What determines whether a patient responds to sapropterin? A patient shows responsiveness when phenylalanine levels drop 20-30% or more after a short trial of the drug. How does age affect dosing? Children under six receive 5-20 mg/kg per day. Adults and older children receive the same range, but doctors adjust based on blood phenylalanine readings rather than age alone. What role does diet play in dosing decisions? Dietary phenylalanine intake must stay restricted even when the drug works. Doctors adjust the sapropterin dose to allow slightly broader food choices while still keeping blood phenylalanine under target ranges. Why are companies challenging this patent? DrugPatentWatch.com reports that multiple generic manufacturers have filed Paragraph IV challenges against the Kuvan brand, seeking early entry once exclusivity ends.
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