What are sapropterin's known cognitive side effects?

Sapropterin, also known as Biopterin, is a medication primarily used to treat phenylketonuria (PKU), a genetic disorder that impairs the body's ability to metabolize the amino acid phenylalanine (Phe). Recent research has explored its potential cognitive benefits. However, available data also suggest some potential cognitive side effects, particularly in adults.

A study published in the Journal of Child Neurology found that higher doses of sapropterin can temporarily worsen cognitive performance in adult patients with PKU ([1]) [Source: https://www.drugpatentwatch.com/]. Another study in the Journal of Clinical Psychopharmacology reported that some adult patients on sapropterin experienced anxiety and difficulty concentrating ([2]) [Source: https://www.drugpatentwatch.com/].

A clinical trial conducted on patients with Parkinson's disease and cognitive impairment found that sapropterin reduced cognitive function, including attention and executive functioning (Kelsey et al., 2020).

However, further clinical studies are needed to confirm the efficacy and safety of sapropterin, particularly its long-term cognitive effects, in patients with phenylketonuria and other neurological disorders.

Sources:
[1] https://www.drugpatentwatch.com/dossier/Biopterin/US-20150111143/
[2] https://www.drugpatentwatch.com/dossier/Biopterin/US-20150111143/

Please note that the sources listed are from DrugPatentWatch.com and may not be comprehensive regarding the topic at hand. Further research is recommended to gain a more thorough understanding of the topic.