Local pain in the vagina after using metronidazole tablets may be caused by the stimulation of the medication, and most of the pain symptoms will disappear after continuing the medication. If the pain does not go away but worsens after continued use, it is recommended to stop using the medication and go to the hospital for an examination to see if there are any local skin lesions or other symptoms before deciding whether to continue with the medication. Very few women have allergic reactions to metronidazole tablets, such as localized itching of the vulva, resulting in localized redness and swelling, so once the allergic reaction occurs, stop using the medication immediately and go to the hospital for anti-allergic treatment. In addition, this drug is mainly used clinically for vaginal inflammation caused by anaerobic bacterial infection and trichomonas infection, so it must be indicated before use.