This study was performed to evaluate the acute toxicity of DA-3030(granulocyte-colony stimulating factor, G-CSF) in mice and rats via intragastrical and intravenous routes. DA-3030(G-CSF) in the acute toxicity study did not induce any toxic signs in the mice and rats in mortalities, clinical findings, body weights and gross findings. It is suggested that LD$_{50}$ values in mice and rats would be >13, 800 $mu extrm{g}$/kg in the oral route and >6, 900 $mu extrm{g}$/kg in the intravenous route.e.