Antibiotics play a major role in infection management. Antibiotics are among the most frequently prescribed medication worldwide. Antibiotics cure disease by killing or injuring the bacteria. The modern era of antibiotics started with the discovery of penicillin by sir alexander fleming in 1928.since then, antibiotics have transformed modern medicine and saved millions of lives. Today, there are over 100 different kind of antibiotics available to doctors for  treatment of minor or life-threatening infections.