The FDA has approved Johnson & Johnson’s anti-FcRn antibody, nipocalimab, for the treatment of generalized myasthenia gravis. The drug will be sold under the brand name IMAAVY. This approval positions J&J to challenge leading competitors in the myasthenia gravis market, such as AstraZeneca, which markets the monoclonal antibodies SOLIRIS and ULTOMIRIS. J&J will also be competing with Argenx’s VYVGART and UCB’s RYSTIGGO and ZILBRYSQ.
On April 30, 2025, the FDA approved Johnson & Johnson’s nipocalimab, branded as IMAAVY, as a new therapy for gMG. This approval puts IMAAVY among the list of approved drugs for myasthenia gravis treatment. The approval, which J&J says encompasses the widest eligible patient population with gMG, includes individuals aged 12 and above who test positive for AChR or anti-muscle-specific kinase (MuSK) antibodies.
IMAAVY functions by inhibiting the FcRn protein, which plays a role in maintaining circulating IgG antibodies, key drivers in many autoimmune disorders. By blocking FcRn, IMAAVY significantly reduces harmful IgG autoantibodies while preserving the body’s overall immune response, according to clinical data.
