Alcinac SR Tablet is a combination medicine used to relieve pain and inflammation in conditions such as muscle pain, joint pain, arthritis, and back pain. It typically contains aceclofenac and paracetamol in a sustained-release form, which provides longer-lasting pain relief. Aceclofenac reduces inflammation by blocking pain-causing chemicals, while paracetamol helps reduce pain and fever. The tablet is usually taken as prescribed by a doctor, preferably after food to avoid stomach irritation. Common side effects include nausea, stomach pain, dizziness, and acidity. It should be used cautiously in patients with liver, kidney, or stomach problems under medical supervision carefully.