Based on the information available, sapropterin alone does not guarantee full control of Phenylketonuria (PKU) [1]. PKU is a genetic disorder characterized by the body's inability to break down an amino acid called phenylalanine, leading to its buildup in the body, which can cause intellectual disability and other health problems [1].

Sapropterin, also known as tetrahydrobiopterin, is a medication used to reduce phenylalanine levels in the blood of people with PKU [1]. It works by helping the body's enzymes break down phenylalanine [1]. However, sapropterin is not effective for everyone with PKU, and its effectiveness varies from person to person [1].

Moreover, sapropterin must be used in conjunction with a phenylalanine-restricted diet to manage PKU effectively [1]. A phenylalanine-restricted diet involves limiting the intake of high-protein foods, such as meat, dairy products, and eggs, and using special medical foods and formula [1].

Therefore, while sapropterin can help control PKU, it is not a standalone cure, and its effectiveness depends on individual factors [1]. It is essential to consult with a healthcare provider for personalized treatment and management of PKU [1].

Sources:

* [1] DrugPatentWatch.com. Sapropterin. <https://www.drugpatentwatch.com/drugs/sapropterin>