Neukine 300mcg injection (Vial) contains the active constituent filgrastim. It is a white blood cell growth factor (granulocyte-colony stimulating factor) approved by the FDA to decrease the risk of developing febrile neutropenia ( occurrence of fever or infection associated with low WBC count) and to reduce the duration of neutropenia (low white blood cell count) in people who have non-myeloid cancer and are receiving chemotherapy drugs. It is also used to increase the number of WBC and decrease the length of time of fever in people with acute myeloid leukemia.