Metronidazole has a certain effect on anal itching caused by anaerobic bacteria and protozoa, but is ineffective for anal itching caused by eczema and allergy. The component of metronidazole is metronidazole, which has the effect of anti-anaerobic bacteria and anti-protozoa, and is mainly used clinically for the prevention and treatment of bacterial-induced infections such as abdominal infections, pelvic infections and so on. Therefore, if the anal itching is caused by the above pathogenic microorganisms, you can use the drug treatment as prescribed by the doctor. However, anal itching may also be caused by eczema, allergies, etc. In this case, the application of metronidazole may not achieve the desired results. It is recommended to consult a doctor for examination, to clarify which cause of anal itching, and then under the guidance of the doctor for appropriate treatment. At the same time, it is also necessary to develop good hygiene habits, keep clean.