(physiology, medicine) Active on vessel walls, that is, causing either constriction or dilation of a blood vessel, thus affecting hemodynamics (blood flow). Vasoactive substances may be endogenous (for example, endogenous angiotensin, vasopressin, or epinephrine) or exogenous (for example, pharmaceutical vasopressin or epinephrine).

The quality or degree of being vasoactive.

plural of vasoactivity

(medicine, endocrinology) A peptide hormone that is vasoactive in the intestine.

plural of vasoactive intestinal peptide