Sulfamerazine sodium salt is primarily used in veterinary medicine as an antibacterial agent. It is effective in treating infections caused by susceptible bacteria in animals, particularly in livestock and poultry. The compound is often administered orally or added to animal feed to control and prevent bacterial diseases such as respiratory infections, gastrointestinal infections, and urinary tract infections. Its broad-spectrum activity makes it a valuable tool in maintaining animal health and ensuring the safety of food products derived from treated animals. Additionally, it is sometimes used in aquaculture to manage bacterial infections in fish and other aquatic organisms.