Willgo TH4 Tablet is a combination medication containing Aceclofenac 100 mg and Thiocolchicoside 4 mg, formulated for the management of musculoskeletal pain and inflammation. 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, inflammation, and swelling. Thiocolchicoside is a muscle relaxant with anti-inflammatory and analgesic properties, acting as a selective agonist of GABA-A and glycine receptors, which helps alleviate muscle spasms and stiffness. The combination of these two agents provides synergistic relief in conditions such as osteoarthritis, rheumatoid arthritis, ankylosing spondylitis, and acute musculoskeletal injuries. Willgo TH4 is indicated for short-term use to manage pain, inflammation, and muscle spasm associated with these disorders. It should be used under medical supervision, particularly in patients with a history of gastrointestinal ulcers, cardiovascular diseases, or renal impairment, due to potential adverse effects related to NSAIDs. Common side effects may include gastrointestinal discomfort, nausea, dizziness, and allergic reactions. Contraindications include hypersensitivity to aceclofenac, thiocolchicoside, or other NSAIDs, and caution is advised during pregnancy and lactation.