Used in the treatment of relapsing forms of multiple sclerosis, including secondary progressive multiple sclerosis. It works by modulating sphingosine 1-phosphate receptors on lymphocytes, reducing the migration of immune cells into the central nervous system. This helps decrease inflammation and slows disease progression. The compound is taken orally and has shown efficacy in clinical trials in reducing relapse rates and delaying disability worsening. It is also being studied for potential use in other neuroinflammatory and autoimmune conditions.