ADDFEN Tablet is a pain-relieving medicine used to reduce pain and inflammation in conditions such as arthritis, muscle pain, back pain, and joint disorders. It usually contains aceclofenac, a non-steroidal anti-inflammatory drug (NSAID) that works by blocking the production of pain and inflammation-causing chemicals in the body. It helps improve mobility and reduces swelling and stiffness. The tablet is generally taken as prescribed by a doctor, preferably after food to avoid stomach irritation. Common side effects include nausea, dizziness, stomach discomfort, and acidity. It should be used cautiously in patients with liver, kidney, or gastrointestinal conditions under medical supervision.