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 can be combined with other antibiotics to broaden coverage. Also active against certain strains of Pseudomonas aeruginosa, making it valuable in treating infections in immunocompromised patients. Commonly administered intravenously or intramuscularly when rapid or high-concentration delivery is needed.