Brufen 400 Tablet is used to relieve mild to moderate pain, inflammation, and fever in adults and paediatrics above 6 months of age. It helps to treat conditions such as menstrual cramps, headache, neuralgia (nerve-related pain), migraine, back pain, dental pain, swelling and stiffness in joints and muscles, cold, and flu symptoms. It contains Ibuprofen, which works by reducing the production of chemicals prostaglandins that are produced at injury sites and cause pain and swelling. Thus, it reduces mild to moderate pain, inflammation, and fever. In some cases, you may experience certain common side effects such as indigestion, diarrhoea, constipation, flatulence (gas), general weakness, and dizziness. Before taking this medicine, you should tell your doctor if you are allergic to any of its components or if you are pregnant/breastfeeding, and about all the medications you are taking and pre-existing medical conditions.