Gleevec's patent for treating leukemia expired in April 2013. Three domestic generic drugs have received production approval and being produce. Imatinib price play major roles for poor patients because it is quite expensive. So thankfully patient have generic affordable option. The generic brand is Veenat 400mg has same effectiveness as Gleevec brand. Imatinib is a type of medicine called targeted therapy . This medication is a tyrosine kinase inhibitor. It works by blocking certain cell signals to help prevent cell growth. Imatinib is used to treat certain Philadelphia chromosome-positive leukemias, including Philadelphia chromosome-positive acute lymphoblastic leukemia (Ph+ ALL) and Philadelphia chromosome-positive chronic myeloid leukemia (Ph+ CML).