Used primarily in the treatment of relapsing forms of multiple sclerosis (MS), this compound acts as an immunomodulator by sequestering lymphocytes in lymph nodes, thereby reducing their migration to the central nervous system. This mechanism helps decrease the frequency of MS relapses and slows the progression of physical disability. It is taken orally, offering a convenient alternative to injectable therapies. Additionally, research explores its potential in other autoimmune conditions and neuroinflammatory diseases due to its ability to cross the blood-brain barrier and exert direct neuroprotective effects.