Gilenya, with the generic name fingolimod, is a prescription medication used in the treatment of certain forms of multiple sclerosis (MS), specifically relapsing-remitting multiple sclerosis (RRMS). It is classified as a sphingosine 1-phosphate receptor modulator, which works by modulating the immune system to reduce inflammation that damages nerve fibers in the brain and spinal cord. By doing so, Gilenya helps to decrease the frequency of relapse episodes and can slow the progression of physical disability associated with MS. It is administered orally in capsule form. As with any medication, it is important to use Gilenya under the guidance of a healthcare professional, as it can have side effects and may not be suitable for everyone with MS.