Cholecystokinin receptor antagonists.

Since 1979 three classes of cholecystokinin receptor antagonists have been described: 1) derivatives of cyclic nucleotides, 2) derivatives of amino acids, and 3) C-terminal fragments or partial sequences of cholecystokinin. These various antagonists share a number of common features, such as their specific, reversible, and competitive actions, but they vary in the potency with which they inhibit the actions of cholecystokinin.