Metronidazole is an antibiotic medication commonly used to treat various infections caused by bacteria and certain parasites. It works by stopping the growth of these harmful microorganisms, making it effective for conditions like bacterial vaginosis, trichomoniasis, and Clostridium difficile infections. Metronidazole can be taken in different forms, including tablets, creams, and intravenous solutions, depending on the type of infection being treated. While generally safe, metronidazole may cause side effects such as nausea, headaches, or a metallic taste in the mouth. It's important to follow a healthcare provider's instructions when using this medication to ensure the best results and avoid potential interactions with other drugs or alcohol.