Mechanism of Action
A monoclonal antibody that inhibits B-lymphocyte stimulator (BLyS/BAFF), a protein that promotes the survival of autoreactive B cells. By blocking BLyS, belimumab reduces the pool of B cells capable of producing pathogenic autoantibodies. Approved by the FDA in 2011, it was the first new drug approved for SLE in over 50 years, and remains one of only two therapies specifically approved for SLE.