Metronidazole is an antibacterial drug that can be used to treat intestinal amebiasis, treat trichomoniasis and anaerobic bacterial infections. It is good for the treatment of pelvic inflammatory disease, bacterial vaginitis, and trichomoniasis caused by anaerobic bacterial infections in women. Adverse reactions are most common with gastrointestinal reactions, which can include nausea, vomiting, loss of appetite, dizziness, headache, and numbness of the limbs. Avoid drinking alcohol while taking metronidazole, which can lead to aggravation of adverse reactions. Avoid spicy and irritating foods. Metronidazole for vaginitis can be used as a local vaginal plug with a course of oral medication. For the treatment of acute pelvic inflammatory disease, intravenous infusion is recommended, combined with other antibiotics at the same time.