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Metronidazole is the drug of choice for amebiases, vaginal trichomonasis and trichlomonadic urethritis in men, lambliosis, amebic dysentery, and anaerobic infections caused by microorganisms that are sensitive to the drug. Synonyms of this drug are flagyl, protostat, trichopol, and vagimid.

Metronidazole is available as oral, intravaginal, topical, and parenteral preparations. It is manufactured by several companies, but is only available by prescription. Unintentional environmental exposure is unlikely, and if it occurs, it is very unlikely to cause toxicity.

Used as an antibacterial in the treatment of rosacea. Antiprotozoal (trichomonas). A potential human carcinogen.

Metronidazole, is an antibiotic and antiprotozoal agent. It is mainly used to treat or prevent systemic or local infections caused by anaerobic bacteria, such as anaerobic bacterial infections in the abdominal cavity, digestive tract, female reproductive system, lower respiratory tract, skin and soft tissues, bones and joints, etc. Inflammation, meningeal infections, and colitis caused by antibiotic use are also effective. Tetanus is often treated with tetanus antitoxin (TAT). It can also be used for oral anaerobic infection. On October 27, 2017, the list of carcinogens published by the World Health Organization's International Agency for Research on Cancer was preliminarily sorted for reference, and metronidazole was included in the list of class 2B carcinogens. In January 2020, metronidazole was selected into the second batch of national centralized drug procurement list.

Metronidazole is the most effective agent available for the treatment of individuals with all forms of amebiasis, with perhaps the exception of the person who is asymptomatic but continues to excrete cysts. That situation calls for an effective intraluminal amebicide, such as diloxanide furoate, paromomycin sulfate, or diiodohydroxyquin. Metronidazole is active against intestinal and extraintestinal cysts and trophozoites.
Although quinacrine hydrochloride has been used for the treatment of giardiasis, many physicians prefer metronidazole. Furazolidone is an alternate choice.
Metronidazole is the drug of choice in Europe for anaerobic bacterial infections; concern about possible carcinogenicity has led to some caution in its use in the United States.Recently it has been found to be effective in treating D. medinensis (Guinea worm) infections and Helicobacter pylori.

It is also used in acne rosacea, balantidiasis and Guinea worm infection. T. vaginalis infections resistant to the usual dosage require special treatment.