While there is no current cure for ALS, HD, or MG, there are treatments to slow disease progression and treat symptoms. Table examines the US FDA approved treatments for these rare diseases along with their CAS RN, therapy types, mechanism of action, and company information. Small molecule drugs dominate the approved drugs for both ALS and HD, with biologic therapies such as monoclonal antibodies, antibody fragments, and peptide therapy making up the approved treatments for MG.