Phosphomycin calcium is primarily used as an antibiotic in veterinary medicine, particularly for the treatment of bacterial infections in livestock and poultry. It is effective against a range of Gram-positive and Gram-negative bacteria, making it a versatile option for managing conditions like respiratory infections, gastrointestinal infections, and urinary tract infections in animals. Additionally, it is often administered in feed or water to ensure ease of delivery and compliance. Its role in promoting animal health contributes to improved productivity and reduced spread of infectious diseases in agricultural settings.