Used primarily in veterinary medicine as an antibacterial agent, especially in the treatment of bacterial infections in livestock and poultry. It is effective against a range of gram-positive and gram-negative bacteria. Commonly administered to prevent and treat respiratory, urinary tract, and gastrointestinal infections in animals. Also used in aquaculture to control bacterial diseases in fish. In some cases, it is included in feed or drinking water for prophylactic use during periods of high infection risk. Its solubility makes it suitable for injection or oral delivery in aqueous formulations. Sulfadiazine sodium inhibits bacterial growth by disrupting folic acid synthesis, which is essential for bacterial DNA production.