Phenylbutazone Calcium is primarily used in veterinary medicine as a non-steroidal anti-inflammatory drug (NSAID) to alleviate pain, inflammation, and fever in animals, particularly horses and cattle. It is effective in treating conditions such as arthritis, musculoskeletal injuries, and post-operative pain. In horses, it is commonly administered to manage lameness and other inflammatory conditions. However, its use in food-producing animals is restricted in many countries due to potential residues in meat and dairy products, which can pose health risks to humans. It is typically administered orally or via injection, depending on the specific veterinary requirements.