Antibiotics used to inhibit the onset of bacterial infections, often administered to individuals undergoing surgical procedures or those who have recently sustained severe injuries. For instance, they are prescribed to ward off endocarditis in patients with artificial heart valves or heart valve abnormalities who are receiving dental treatments. These drugs may also be given to individuals in close proximity to a meningococcal meningitis case to prevent them from contracting the illness, as well as to avert infections following a bite.