Examples of anti-anaerobic drugs are as follows: 1, nitroimidazoles, representative drugs metronidazole, tinidazole, ornidazole, of which ornidazole has the strongest efficacy and the least side effects, but the most expensive. Nitroimidazoles are the most widely used anti-anaerobic drugs in clinical practice, and can be used for anaerobic infections of the oral cavity, abdominal cavity, pelvis and bone and joint. 2, carbapenems, representing the drugs imipenem, meropenem, ertapenem. This class of drugs not only has a great antibacterial effect on Gram-positive and negative bacteria, but also has good efficacy on anaerobic bacteria, but expensive, generally not as the first choice. 3, Lincomycin, representative drugs Lincomycin, Clindamycin, which is characterized by high concentration in the bone and bone marrow, so anaerobic bacterial infections of bone and joint can be preferred. 4, Quinolones, mainly quinolone moxifloxacin, has a strong anti anaerobic bacterial effect, while the other one, two, three generations are very weak.