Gilenya is a prescription medicine used to treat relapsing forms of Multiple Sclerosis (MS), in adults as well as children ages 10 years and older. MS is a neurological condition where your immune system attacks myelin, the protective layer on nerve fibers of the central nervous system. As a result of your immune system attacking your nerves, the damage interferes with messages being sent from the brain to the body. It is a disease where nerves do not function normally and people with MS can experience weakness, numbness, loss of coordination, and difficulty with vision and speech. Gilenya is used to treat the relapsing forms of MS as it contains the drug fingolimod. The drug fingolimod works by decreasing the action of immune cells that may cause nerve damage. It is used to prevent episodes of symptoms and slow the worsening disability in adults and children 10 years of age with relapsing-remitting forms (period of disease in which the nerves do not function normally) of MS.