Nilotinib 200mg Capsules is used in the treatment of blood cancer (Chronic myeloid leukaemia). It is used in patients whose disease could not be treated with other medications for leukaemia or who cannot take these medications because of side effects. Nilotinib 200mg Capsules Capsule is an anti-cancer medication. It works by blocking the action of the abnormal protein that signals cancer cells to multiply. This helps to stop or slow the spread of cancer cells.