It is produced by the strain of Semisynthetic cephalosporin for injection against pseudomonas. Cefsulodin has a narrow antibacterial spectrum. Except for Pseudomonas onion, Cefsulodin is sensitive to other pseudomonas bacteria. The antibacterial activity of Cefsulodin against pseudomonas aeruginosa is 16-32 times stronger than carboxylpenicillin, similar to gentamicin, but it has little effect on other gram-negative and positive bacteria.