Melarsonyl (Melarsonic acid) is an anthelmintic agent which can inhibit parasite potently. IC50 & Target: Parasite^[1] In Vivo: For acute infections produced by T. brucei brucei GVR, Potassium Melarsonyl exhibits trypanocidal activities. Potassium Melarsonyl (Trimelarsan) cures less than 50% mice at a dose of 25 μmol/kg for 4 consecutive days. At 60 μmol/kg, it cures all the mice in a chronic-infection model^[1].