Metronidazole is an antibiotic medication commonly used to treat various bacterial and parasitic infections. It works by disrupting the DNA of the microorganisms, effectively killing them. This medication is often prescribed for conditions such as bacterial vaginosis, trichomoniasis, and certain types of gastrointestinal infections. Metronidazole can be taken orally in pill form, applied topically as a cream or gel, or administered intravenously in a hospital setting. While it is generally effective, some people may experience side effects like nausea, headaches, or a metallic taste in the mouth. It is important to complete the full course of treatment as prescribed by a healthcare professional.