Filgrastim (ReliGrast) is a sterile, clear, colorless, preservative-free liquid containing Filgrastim for parenteral administration. It is available as single use Pre-Filled Syringe (PFS) of 0.5 mL containing 300 mcg of Filgrastim concentrated solution Ph.Eur. in a sodium acetate aqueous buffer containing sorbitol and polysorbate 80.
Filgrastim (human granulocyte colony-stimulating factor, G-CSF) is a 175 amino acid protein manufactured by recombinant DNA technology by inserting human gene coding for G-CSF into Escherichia coli (E. Coli). The amino acid sequence in Filgrastim is identical to human G-CSF except for the addition of an N-terminal methionine necessary for expression in E. Coli and is not glycosylated.