Used to treat a wide range of bacterial infections, including respiratory tract infections, urinary tract infections, skin infections, and intra-abdominal infections. Particularly effective against Gram-negative bacteria and some Gram-positive organisms. Often used in hospital settings for severe infections and as part of combination therapy when resistance is a concern. Also active against certain strains of Pseudomonas aeruginosa, making it valuable in treating infections in immunocompromised patients. Commonly administered intravenously or intramuscularly in clinical environments.