The active substance in Filgrastim ratiopharm, filgrastim, is very similar to a human protein called granulocyte colony stimulating factor (G-CSF).
Filgrastim ratiopharmi toimeaine filgrastiim on väga sarnane inimvalguga, mida nimetatakse granülotsüütide kolooniaid stimuleerivaks teguriks (G- CSF).