Flexura 400 MG (Metaxalone) is a muscle relaxant that helps to relieve pain, aches, and discomfort due to muscle strain and spasms. It works by blocking nerve impulses in the brain and spinal cord that cause muscle contractions. This medication is available in tablet form and can be taken with or without food. It is important to take Flexura 400 MG (Metaxalone) exactly as prescribed by your doctor. Be sure to talk to your doctor about any potential side effects before taking this medication.