Used for sepsis, lower respiratory tract infections, abdominal infections, biliary tract infections, complicated urinary tract infections, and severe skin and soft tissue infections caused by sensitive Gram-negative bacilli. This product is particularly suitable for infections in immunocompromised patients caused by various drug-resistant Gram-negative bacilli, hospital-acquired infections, and central nervous system infections caused by Gram-negative bacilli or Pseudomonas aeruginosa.