Blood cancer, also called leukemia, is a cancer of the blood-forming tissues, which reduces the body's ability to fight infection. Imatib 400 Tablet kills or stops the growth of cancer cells and also prevents cancer cells from dividing. It is a powerful and highly toxic drug and you should discuss the risks and benefits with your doctor. You should avoid drinking alcohol during this treatment and drink plenty of water to stay hydrated. Imatib 400 Tablet is probably not safe to use while breastfeeding. Limited human data suggests that the drug may pass into breast milk and harm a nursing baby.