400mg Imatinib Mesylate Tablets are a type of tablet that are used in the treatment of various types of cancers, including leukemia and gastrointestinal stromal tumors. These tablets are made in India and are composed of 100% yeast. They come in a tablet form and are to be stored at a cool and dry place. The tablets feature a dry enzyme and have a normal fermentation smell. The tablets work by blocking the action of certain abnormal proteins that cause cancer cells to grow and multiply. These tablets are available in a pack of 30 tablets.