Based on the information provided, it is not possible to definitively state that sapropterin eliminates symptoms entirely. Sapropterin is a medication used to reduce the symptoms of phenylketonuria (PKU), a genetic disorder that can cause intellectual disability, seizures, and other serious health problems if left untreated [1].

PKU is caused by a deficiency of the enzyme phenylalanine hydroxylase, which is needed to break down the amino acid phenylalanine. When phenylalanine builds up in the body, it can cause harm to the brain and nervous system. Sapropterin works by increasing the activity of the remaining phenylalanine hydroxylase, helping to reduce the levels of phenylalanine in the body [1].

While sapropterin has been shown to be effective in reducing phenylalanine levels and improving cognitive function in some people with PKU, it does not eliminate the disorder or its symptoms entirely [1]. It is important to note that sapropterin is most effective when used in conjunction with a low-phenylalanine diet [1].

In summary, sapropterin is a medication used to reduce the symptoms of PKU, but it does not eliminate the disorder or its symptoms entirely. It is most effective when used in conjunction with a low-phenylalanine diet.

Sources:
[1] DrugPatentWatch.com - Sapropterin DiHydrochloride (KUVAN) - <https://www.drugpatentwatch.com/drugs/sapropterin-dihydrochloride-kuvan>