Used primarily in the treatment of myelofibrosis, a type of bone marrow disorder that disrupts the production of blood cells. It functions as a Janus kinase (JAK) inhibitor, helping to reduce symptoms such as spleen enlargement, anemia, and fatigue. Additionally, it has shown potential in addressing other hematologic malignancies and inflammatory conditions due to its ability to modulate immune responses and cellular signaling pathways. Its therapeutic benefits make it a valuable option for patients who have not responded well to other treatments.