Veenat 100 (Imatinib Mesylate 100mg) is a generic version of popular branded anti-cancer medications. A protein enzyme, bcr-abl tyrosine kinase, is responsible for the growth of abnormal proliferation of cancer cells. This medicine inhibits the proliferation and induces apoptosis (planned cell death) in bcr-abl positive cells (cancer cells). This is how it works to stop or slow the spread of cancer. It is used in the treatment of blood cancer (Chronic Myeloid Leukemia and Acute Lymphocytic Leukemia) and gastrointestinal stromal tumors.