cancer cells. Chemo is also used to keep the disease from metastasizing to other locations of the body. There are a wide array of chemotherapy drugs used to treat various forms of cancer. Often, chemo is used in conjunction with radiation as a total therapy program. Drug therapy may also mean receiving therapy for a drug addiction. Many individuals who have drug-related issues, such as dependency on a narcotic, receive professional counseling in a drug therapy or rehabilitation, or rehab, program. This may include counseling on an in-patient basis or admission to a hospital or other facility for extensive treatment. The patient will receive support and guidance on how to manage his lifestyle and become addiction-free. ]