This medication is used to treat certain bone marrow disorders (myelofibrosis, polycythemia vera). It works by blocking your body from producing substances called growth factors. Growth factors cause cells to grow and divide, and cause the blood cell and spleen problems found in these disorders... Ruxolitinib is also used to treat a certain problem that may occur after certain stem cell or bone marrow transplants (graft versus host disease). It works by weakening your body's defense system (immune system). View More Info

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