Xpain 4 Tablet is a combination medication containing Aceclofenac 100 mg and Thiocolchicoside 4 mg, formulated to provide effective relief from pain and inflammation associated with musculoskeletal disorders. Aceclofenac, a non-steroidal anti-inflammatory drug (NSAID), exerts its therapeutic effect by inhibiting cyclooxygenase enzymes (COX-1 and COX-2), thereby reducing the synthesis of prostaglandins responsible for pain and inflammation. Thiocolchicoside, a muscle relaxant with anti-inflammatory properties, acts on the central nervous system by selectively blocking glycine receptors, resulting in the relaxation of skeletal muscles and alleviation of muscle spasms. The combined action of these two agents makes Xpain 4 Tablet suitable for managing conditions such as osteoarthritis, rheumatoid arthritis, ankylosing spondylitis, and acute musculoskeletal pain including strains and sprains. It is typically prescribed for short-term use to minimize potential adverse effects. Common side effects may include gastrointestinal discomfort, nausea, dizziness, or allergic reactions; hence, it should be used under medical supervision, especially in patients with a history of gastrointestinal ulcers, cardiovascular diseases, or hepatic and renal impairment. Xpain 4 Tablet should be taken as directed by a healthcare professional to ensure optimal efficacy and safety.