Chemotherpeutic agents-related neurotoxicity is an important issue while patient undergoing chemotherapy. Neurological side effects are common to many chemotherapeutic agents, and they effect all levels of the nervous system. Usually neurotoxicity of these medications is dose-limiting, and neurotoxicity may compromise quality of life and change the result of chemotherapy. Differentiating the complications of chemotherapy from paraneoplatic syndrome is difficult. The incidence of neurotoxicity will increase as patients are surviving longer and being treated more aggressively with higher-dose regimens and combinations of treatment modalities. Recognizing these complications and addressing them will become a more frequent and challenging clinical problem for practicing neurologists.