Neosalvarsan
（重定向自Neoarsphenamine）
![](/Images/godic/202501/29/Neosalvarsan-3D-vdW5342.png")
Neosalvarsan is a synthetic chemotherapeutic that is an organoarsenic compound. It became available in 1912 and superseded the more toxic and less water-soluble salvarsan as an effective treatment for syphilis. Because both of these arsenicals carried considerable risk of side effects, they were replaced for this indication by penicillin in the 1940s.