This medication is used by people with a certain inherited condition (phenylketonuria) to reduce high levels of a certain substance (phenylalanine) that builds up in the blood. Having high levels of phenylalanine in the blood may cause brain damage, heart problems, an abnormally small... Along with using this medication, you should follow a special diet to control your blood phenylalanine levels. Ask your doctor for details. View More Info

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