Etoricoxib Thiocolchicoside Tablets may used in the treatment of pain due to muscle spasm. Etoricoxib Thiocolchicoside tablets is a combination of two medicines: Etoricoxib and Thiocolchicoside tablets may works by blocking the release of certain chemical messengers that cause pain and inflammation (redness and swelling). Thiocolchicoside tablets is a muscle relaxant. Thiocolchicoside tablets may works on the centers in the brain and spinal cord to relieve muscle stiffness or spasm and to improve pain and movement of muscles.