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Accidental ingestion of Orfadin (nitisinone) by individuals eating normal diets not restricted in tyrosine and phenylalanine will result in elevated tyrosine levels. In healthy volunteers given a single 1 mg/kg dose of nitisinone, the plasma tyrosine level reached a maximum of 1200 µmol/L from 48 to 120 hours after dosing. After a washout period of 14 days, the mean value of plasma tyrosine was still 808 µmol/L. Fasted follow-up samples obtained from volunteers several weeks later showed tyrosine values back to normal. There were no reports of changes in vital signs or laboratory data of any clinical significance. One patient reported sensitivity to sunlight. Hyper-tyrosinemia has been reported with Orfadin (nitisinone) treatment [see WARNINGS AND PRECAUTIONS].

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Last reviewed on RxList: 2/18/2010
This monograph has been modified to include the generic and brand name in many instances.