Metronidazole belongs to the class of antibiotics. The role of metronidazole suppositories in the anus is mainly antibacterial infection, mainly for the anus, rectum, female reproductive system of anaerobic bacterial infections have a therapeutic effect. Metronidazole is mainly for anaerobic bacteria and protozoa and other therapeutic effects, such as digestive streptococcus, trichomonas infection, amoebic infection, etc. Because oral metronidazole drugs are more irritating to the digestive tract, nausea, vomiting symptoms can occur, through the anal administration of drugs to reduce the symptoms of digestive tract irritation, metronidazole for tetanus has a certain therapeutic effect. The anal administration of metronidazole can quickly treat infections in the anus, rectum, and perineum, and has few side effects.