Tiludronic acid is a synthetic derivative of pyrophosphate belonging to the class of biphosphonates. It is best known for it's use for the treatment of navicular disease, bone spavin, and fetlock suspensory ligament injuries in horses. In humans, it is used for the treatment of Paget's disease.
The drug affects calcium metabolism and inhibits bone resorption and soft tissue calcification, and is beneficial for preventing and treating osteoporosis in laying hens.