Chemotherapy is a general term that is used to describe cancer-killing drugs. Such drugs can be given intravenously, through a vein; orally, by mouth; subcutaneously, injected under the skin; intramuscularly, injected into a muscle; or intrathecally, injected into the cerebrospinal fluid (CSF).
Chemotherapy for leukemia is varied, because there are many different forms of this disease. In general, though, leukemia treatment relies on combination chemotherapy with a number of different anticancer drugs. Such drugs destroy cancer cells by preventing them from growing and dividing rapidly. Unfortunately, a number of the body's normal, noncancerous cells also divide rapidly and therefore are harmed by chemotherapy. Specifically, the hair follicles, red and white blood cells, blood-clotting platelets, and cells that line the gastrointestinal system may be damaged or destroyed, causing side effects. Such side effects depend upon the type and dose of drugs taken, as well as the length of time that they are used.