Cefsulodin sodium is primarily used as an antibiotic in medical and research settings, particularly for its effectiveness against Pseudomonas aeruginosa, a common pathogen in hospital-acquired infections. It is often employed in clinical microbiology laboratories for selective isolation and identification of this bacterium. In therapeutic applications, it is used to treat infections caused by Pseudomonas aeruginosa, including respiratory tract infections, urinary tract infections, and septicemia. Additionally, it serves as a valuable tool in antibiotic susceptibility testing to evaluate the resistance patterns of bacterial strains. Its targeted action makes it a critical component in managing infections where other antibiotics may be ineffective.