Cefasyn 500mg is an oral antibiotic used to treat various bacterial infections. It belongs to the cephalosporin class of antibiotics and works by stopping the growth and spread of bacteria. It is commonly used to treat infections of the respiratory tract, skin, and urinary tract. Cefasyn 500mg is usually taken two or three times a day with or without food. Finishing the full course of treatment is important to ensure complete elimination of the bacteria. As with all antibiotics, it is important only to use Cefasyn 500mg as directed by a healthcare provider to prevent the development of antibiotic resistance.