thiocolchicoside Aceclofenac Paracetamol is a combination of a muscle relaxant (Thiocolchicoside ) and two pain relievers ( Aceclofenac , Paracetamol). The muscle relaxant works on the centers in the brain and spinal cord to relieve muscle stiffness or spasm and improve movement of muscles . Thiocolchicoside is a muscle relaxant that is commonly used to treat back pain and other pains caused by vertebral column or spinal cord disorders.