Common antibiotic drugs are penicillin, amoxicillin, erythromycin, azithromycin, and cephalosporins. However, so many of the drugs we are talking about are trade names, such as amoxicillin. Antibiotics are produced by bacteria, mold, or other microorganisms, in the process of life, with anti-pathogens and other active class of drugs, mainly divided into the following categories: first, β-lactams, penicillins and cephalosporins. This kind is usually often used, such as upper respiratory tract infections, tonsillitis, or digestive system, urinary system infections, often choose the cephalosporin class of antibiotics, which we all know. Secondly, the aminoglycosides, the main representative drugs are gentamicin and butylamine kanamycin. But these drugs are usually not used too much, because it has certain side effects. Third, tetracyclines, the common drugs are tetracycline, oxytetracycline. Fourth, chloramphenicol, mainly chloramphenicol and methylsulfonamides. Fifth, macrolides, which are also more commonly used, is erythromycin and acetylspiramycin, these usually oral drugs are also very common. Sixth, other classes of antibiotics that act on gram-positive bacteria, such as vancomycin, these are used for severe infections. Seventh, other antibiotics for gram-positive bacteria, such as polymyxin, coleomycin, cyclosporine these drugs.