Dantrolene sodium capsules are effective in improving the state of increased spasmodic muscle tone that occurs with motor neuron injury. Dantrolene sodium is a muscle relaxant that acts directly on skeletal muscle. Its main site of action is the sarcoplasmic reticulum of skeletal muscle, which weakens muscle contraction by inhibiting the release of calcium ions from the sarcoplasmic reticulum. It is used for spasmodic hypertonic state left by upper motor neuron injury caused by various reasons, such as stroke, traumatic brain injury, spinal cord injury, cerebral palsy, multiple cerebral vascular sclerosis and so on. Dantrolene sodium capsule may appear during the use of muscle weakness, drowsiness, dizziness, dizziness, fatigue discomfort, diarrhea and other adverse reactions; allergic to the product, liver and kidney dysfunction, functional spasticity state of the person, arthropathy and post-traumatic myoclonus, more than 35 years of age and the application of estrogen, pregnant women, lactating mothers, children under the age of 5 years and other groups of people prohibited. The drug should be taken under the guidance of a doctor, and if side effects occur while taking the drug, stop using the drug in time and let a professional doctor decide whether to continue using or change the drug.