Filgen 300 µg Injection (Filgrastim) — Neutrophil Support After Chemotherapy Filgen 300 µg Injection contains filgrastim, a recombinant human granulocyte colony-stimulating factor (G-CSF) used to help the body increase neutrophil white blood cells and reduce the risk of infection in patients with neutropenia due to chemotherapy, bone marrow transplantation, or severe suppression of the bone marrow. Administered by subcutaneous or intravenous injection under medical supervision, Filgen stimulates bone marrow activity and boosts immune response. It is essential in cancer supportive care protocols and requires regular blood count monitoring for safety and effectiveness.