Moxalactam sodium salt is primarily used as a broad-spectrum antibiotic in the treatment of various bacterial infections. It is particularly effective against Gram-negative bacteria, including strains resistant to other antibiotics. This makes it valuable in treating serious infections such as sepsis, pneumonia, and intra-abdominal infections. It is often administered intravenously in hospital settings for patients with severe or life-threatening conditions. Additionally, it is used in cases where other antibiotics have failed due to bacterial resistance. Its ability to penetrate tissues and reach high concentrations in the body enhances its efficacy in combating infections in hard-to-treat areas like the central nervous system.