Carbarsone is primarily used in veterinary medicine as an antiprotozoal agent, particularly for treating infections caused by amoebae and other protozoan parasites in animals. It is effective in managing conditions like histomoniasis in poultry and intestinal amoebiasis in various species. Additionally, it has been historically used in human medicine to treat amoebic dysentery, though its use in humans has significantly declined due to potential toxicity concerns. In some cases, it is also employed as a feed additive to promote growth and prevent parasitic infections in livestock. However, its application is strictly regulated due to its arsenic content and associated health risks.