Flagyl Is The Brand Name For Metronidazole, An Antibiotic And Antiprotozoal Medication. It Is Used To Treat A Wide Range Of Infections Caused By Bacteria And Certain Parasites. Flagyl 400Mg Tablets Are Commonly Prescribed For Infections In Various Body Systems, Including The Gastrointestinal, Respiratory, And Reproductive Tracts. Side Effects: Common Side Effects: Nausea, Vomiting, Metallic Taste, Headache, And Abdominal Discomfort. Serious Side Effects: Rare But Can Include Seizures, Liver Toxicity, Neuropathy, And Allergic Reactions Like Rashes Or Swelling. Precautions: Allergic Reactions: If You Are Allergic To Metronidazole, Avoid Using Flagyl. Liver Problems: Caution Is Required If You Have Liver Issues, As The Drug Is Metabolized By The Liver. Pregnancy And Breastfeeding: Flagyl Is Classified As A Category B Medication For Pregnancy, But It Is Important To Consult A Doctor Before Using It During Pregnancy Or Breastfeeding. Avoid Alcohol: Alcohol Consumption During Flagyl Treatment Can Result In Severe Side Effects, Including Nausea, Vomiting, And Headaches.