Sincalide (CCK-8) is a cholecystokinetic drug administered by injection to aid in diagnosing disorders of the gallbladder and pancreas. It is the 8-amino acid C-terminal fragment of cholecystokinin.

Sincalide ammonium (CCK-8 ammonium) is a potent analog of the amino acid peptide hormone cholecystokinin (CCK), an active fragment that retains much of the biological activity of CCK.Sincalide ammonium promotes bile secretion, causes gallbladder contractions and relaxes the sphincter of Oddi, thereby facilitating bile drainage into the duodenum. Sincalide ammonium promotes bile secretion, contraction of the gallbladder and relaxation of the sphincter of Oddi, thereby facilitating the drainage of bile into the duodenum.Sincalide ammonium can be injected to promote gallbladder contraction, and is commonly used as an adjunct in the diagnosis of gallbladder and pancreatic diseases and in cholecystography.