When used topically, metronidazole tablets can be used to treat trichomonas vaginitis and bacterial vaginosis, etc. The specific dosage is as follows. Wash your hands, remove the metronidazole tablets and set them aside. Wash the vulva with warm boiled water or use a vaginal douche to flush the vagina if there is a lot of discharge. Elevate your buttocks and use your fingers to deliver the metronidazole tablet into the vagina, slowly pushing it to the posterior vaginal fornix, about the distance of one middle finger. After inserting the pill, place a pad of toilet paper into your underwear to avoid contamination from the medication or discharge coming out. When using the medication vaginally, try to choose to use it at night before going to bed, and avoid walking around after inserting the medication to prevent the medication from flowing out, which will help the medication to exert its effect. During the medication period, you should keep your vulva clean, change your underwear frequently, and prohibit sexual intercourse. All of the above medications should be used under the guidance of a doctor, avoid self-medication.