| CPC A61K 31/519 (2013.01) [A61K 9/0053 (2013.01)] | 6 Claims |

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1. A method of treating a BH4-related disorder in a subject in need thereof, the method comprising administering to the subject an effective amount of sepiapterin, or a pharmaceutically acceptable salt thereof, without food, wherein the BH4-related disorder is phenylketonuria.
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