Antibiotics are a class of secondary metabolites with anti-pathogen or other activity by the micro-organisms (including bacteria, fungi, actinomycetes genus) or higher plants and animals living in the process of arising, life can interfere with other functional chemicals cell development . Now commonly used in clinical antibiotic genetically engineered bacteria [1] compound chemically synthetic or semi-synthetic medium and liquid extract. Currently known natural antibiotic less than million. Antibiotics previously known as antibiotics, the fact that it not only can kill bacteria and other pathogenic microorganisms fungi, mycoplasma, chlamydia, spirochetes, rickettsia, also has a good inhibitory and killing effect, usually antibiotic renamed antibiotics . Antibiotics may be a microbial growth and reproduction of certain substances generated in the process, except for the antibiotic treatment thus extracted directly outside; there are entirely synthetic or partially synthetic. More simply, antibiotics are used to treat a variety of non-viral infections. However, in clinical use it has begun to show a lot of side effects