Inhibitory action of antidiuretic hormone on canine pancreatic exocrine flow.

A direct relationship was observed between the percentage inhibition of secretin-stimulated pancreatic exocrine flow and the dose of antidiuretic hormone administered with the minimal effective concentration being 0.75 m units/kg or 0.012 m units/ml. An alteration in the molecular configuration of the antidiuretic hormone modified its ability to inhibit secretin-stimulated pancreatic exocrine secretion.