vasoactive intestinal polypeptide
a polypeptide hormone secreted most commonly by non-ß islet cell tumors of the pancreas; VIP increases the rate of glycogenolysis and stimulates pancreatic bicarbonate secretion; excess production causes copious watery diarrhea and fecal electrolyte loss, with hypokalemia and hypochlorhydria.
Synonym(s): vasoactive intestinal peptide
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Examples: glitazone, GI cocktail, etc.