| Autoimmune disorders of multiple target organs have been
reported in patients using interferons, including Avonex ®.
These autoimmune disorders include arthritis, idiopathic thrombocytopenia
(reduction in the number of platelets in the blood), hyperthyroidism
and hypothyroidism, and rare cases of autoimmune hepatitis
(inflammation of the liver caused by the body's immune system attacking
it - liver damage) have also been reported.
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