Tizanidine hydrochloride tablets are not painkillers, but have some pain-relieving effect. They are essentially a skeletal muscle relaxant that acts on the central nervous system and is more effective in improving painful muscle spasms. Especially after upper motor neuron damage, resulting in muscle spasm and stiffness, such as cerebral infarction or cerebral hemorrhage, traumatic brain injury or spinal cord injury, multiple sclerosis or other organic brain disease, resulting in significant spastic paralysis of the limbs, increased muscle tone, manifesting as folding knife or lead pipe like straightening, resulting in long-term muscle pulling, tension and pain, the use of Tizanidine is more effective in improving the results. This drug also has adverse effects, but they do not last long and can be tolerated after a period of time. More commonly, they cause increased sleep, fatigue, dizziness, and sometimes gastrointestinal reactions such as dry mouth, nausea, and poor appetite, and occasionally lower blood pressure.