Ceruletide is primarily used in medical diagnostics and treatments. It is commonly employed to stimulate the gallbladder and pancreas, aiding in the diagnosis of pancreatic and biliary tract disorders. By inducing contractions in these organs, it helps in imaging studies to detect abnormalities or blockages. Additionally, ceruletide is utilized in the treatment of paralytic ileus, a condition where the intestines cease to function properly, by promoting gastrointestinal motility. It is also used in veterinary medicine to stimulate digestive secretions in animals. Its ability to mimic the action of natural hormones makes it a valuable tool in both diagnostic and therapeutic applications.