Midostar 25 Midostar 25 contains Midostaurin 25 mg, a targeted anti-cancer medicine that helps control the growth of certain blood cancer cells by blocking proteins responsible for their multiplication and survival. It is mainly used in patients with FLT3-positive Acute Myeloid Leukemia (AML) along with chemotherapy and is also prescribed for specific forms of systemic mastocytosis. By targeting abnormal cell signaling, Midostar helps slow disease progression and supports better treatment outcomes. It should be taken only under the supervision of a qualified oncologist.