Use of sapropterin in the management of phenylketonuria: seven case reports.

Sapropterin treatment, with or without dietary treatment, improves blood phenylalanine control, increases phenylalanine tolerance, and may reduce the day-to-day dietary treatment burden in a subset of patients with phenylketonuria (PKU). Balancing the need for maintained control of blood phenylalanine with diet relaxation is complex when administering sapropterin. We present a series of seven patient cases with PKU that illustrate important aspects of using sapropterin with diet in the management of the disorder.