Fusidic Acid (sodium salt) (CAS No 751-94-0) is a potent antibiotic used primarily in biomedical research to study bacterial infections and resistance mechanisms Originating from fungal sources it targets the bacterial protein synthesis pathway by inhibiting the elongation factor G (EF-G) which is crucial for ribosomal translocation This action effectively suppresses the growth of susceptible bacteria Research demonstrates that its in vitro activity can range from nanomolar to low micromolar concentrations making it effective against various Gram-positive bacteria including Staphylococcus aureus It is frequently utilized in cell models animal studies and drug screening assays to explore its antibacterial properties and potential therapeutic applications Experimental concentrations typically depend on the specific research design ensuring the flexibility needed for effective study outcomes