Metronidazole is a kind of nitroimidazole antibiotics, also known as metronidazole, metronidazole, metronidazole and metronidazole. It can kill anaerobes. The metabolites produced when it is reduced in human body also have anti anaerobes effect, inhibit the synthesis of deoxyribonucleic acid, interfere with the growth and reproduction of bacteria, and eventually lead to the death of bacteria, Anti anaerobes generally include: Bacteroides fragilis, Fusobacterium (named for its sharp spindle shape at both ends), tetanus, peptococcus, peptococcus and Giardia. It was initially used for the treatment of vaginal trichomoniasis, and the clinical effect is very significant. Later, it was found that metronidazole can also kill the anaerobic bacteria causing oral infection. In 1978, it was identified as a specific drug for anti anaerobic bacteria infection by the World Health Organization, which was widely used in the prevention and treatment of oral anaerobic bacteria infection. In hospital, this product is often used to prevent and treat respiratory tract, digestive tract, abdominal and pelvic infections caused by anaerobic bacteria, skin and soft tissue and bone and joint infections, pericarditis, sepsis and brain diseases.