Fusidic acid sodium salt is primarily used as an antibiotic in the treatment of bacterial infections. It is effective against a range of Gram-positive bacteria, including Staphylococcus aureus, making it valuable in treating skin infections, wound infections, and eye infections. It is often formulated as a cream, ointment, or eye drops for topical application. In some cases, it is also used systemically to treat more severe infections, such as osteomyelitis or sepsis, particularly when caused by antibiotic-resistant strains like MRSA. Its mechanism of action involves inhibiting bacterial protein synthesis, which helps to halt the growth and spread of the infection. Due to its targeted activity, it is considered a useful option in cases where other antibiotics may be less effective.