Dantrolene, marketed under the brand name Dantrium among others, is a medication used to treat muscle spasticity associated with conditions such as spinal cord injury, stroke, cerebral palsy, and multiple sclerosis. It is also the primary treatment for malignant hyperthermia, a rare, life-threatening disorder triggered by certain anesthesia drugs. Dantrolene works by interfering with the release of calcium from the sarcoplasmic reticulum in muscle cells, thereby reducing muscle contractions and alleviating spasticity. It is available in both oral and intravenous formulations, allowing for flexibility in administration based on the condition being treated. While effective, it is important for patients to be aware of potential side effects, which can include muscle weakness, drowsiness, and liver toxicity, among others. Regular monitoring by a healthcare provider is recommended to ensure the safe use of this medication.