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Filgrastim, sold under the brand name Neupogen among others, is a medication used to treat low neutrophil count.[6] Low neutrophil counts may occur with HIV/AIDS, following chemotherapy or radiation poisoning, or be of an unknown cause.[6] It may also be used to increase white blood cells for gathering during leukapheresis.[6] It is given either by injection into a vein or under the skin.[6] Common side effects include fever, cou... [wikipedia]