<unk>  is a phenylalanine hydroxylase activator that is FDA approved for the treatment of high blood phenylalanine (Phe) levels in patients with hyperphenylalaninemia (HPA) due to tetrahydrobiopterin- (BH4-) responsive Phenylketonuria (PKU).<unk>  is to be used in conjunction with a Phe-restricted diet..   Common adverse reactions include headache, rhinorrhea, pharyngolaryngeal pain, diarrhea, vomiting, cough, and nasal congestion.
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