Imatinib Metysylate is a mesylate salt which acts as an inhibitor against chronic myelogenous leukemia (CML), gastrointestinal stromal tumours and a number of other malignancies. The drug has given hope to many terminally ill patients. The drug initially tested on patients in the starting stages of cancer showed great results, So the drug was administered to terminally ill patients. The doctors and patients were amazed by the results as patients who were bed ridden and were diagnosed that they would die within a few days was shocked to see them stand up and walk out of the hospital in a few days. The drug has reduced the fatality rate by nearly 90%. It has increased the survival rate by over five years for CML patients. The drug is considered another chance to live by CML patients and their doctors. The drug has mild side effects like decreased white blood cell, decreased white blood cells, heartburn, Headache and fluid retention and swelling around the eyes. But overall the drug is very effective and can literally stop CML. The drug has lower risk side effects considering other treatment methods. The drug is also effective than other treatments in improving the quality of life for the patients.