Polymyxin B is an antibiotic. It can kill bacteria and anti-inflammatory, treat sensitive bacterial infections, urinary tract infections, systemic infections, etc. It belongs to the special-use grade antibiotics, and is recommended to be used when other antibiotics are ineffective, and it is better to have clear evidence of drug sensitivity. 1. Sensitive bacterial infections: after bacterial culture is determined as sensitive bacteria, it generally has antibacterial effect on Pseudomonas aeruginosa, Escherichia coli, Klebsiella pneumoniae, and gram-negative bacteria such as Haemophilus, Enterobacteriaceae, Salmonella, Shigella, B. pertussis, Pasteurella, and Vibrio. 2. Urinary tract infections: when patients with urinary tract infections can also be prescribed the use of this drug to play an anti-inflammatory and bactericidal effect, such as urinary tract infections, pyelonephritis. 3. Respiratory tract infections: such as bronchitis, pneumonia. 4. Systemic infections: such as sepsis caused by pathogenic bacteria, peritonitis, as well as Pseudomonas aeruginosa and other Pseudomonas burns and skin and mucous membrane infections. The drug can have renal function impairment, gastrointestinal reactions such as nausea, vomiting and diarrhea. It is recommended to consult a doctor when discomfort occurs, and use with caution or reduce the dosage appropriately if renal function is abnormal. Polymyxin B is an antibiotic and should be used under medical supervision. If any abnormality occurs during the use of the drug, the drug should be immediately discontinued and consult a doctor.