The US FDA has approved efgartigimod (Brand name: Vygart) a first-in-class, targeted therapy for adults with generalized myasthenia gravis (gMG) who test positive for the antiacetylcholine receptor (AChR) antibody.
Efgartigimod is an antibody fragment designed to reduce pathogenic IgG antibodies and block the IgG recycling process in patients with gMG. The novel agent binds to the neonatal Fc receptor (FcRn), which is widely expressed throughout the body and plays a central role in rescuing IgG antibodies from degradation. Blocking FcRn reduces IgG antibody levels.
The most common side effects associated with the use of Vyvgart include respiratory tract infections, headache, and urinary tract infections. As Vyvgart causes a reduction in IgG levels, the risk of infections may increase. Hypersensitivity reactions such as eyelid swelling, shortness of breath, and rash have occurred. If a hypersensitivity reaction occurs, discontinue the infusion and institute appropriate therapy.
Source: FDA