<prompt> Bradykinin is forPainVasodilationVasoconstrictionIncrease in vascular permeability  <response>: Ref Robbins 8e p65; 7e p45,9e p89 Bradykinin is a potent endothelium-dependent vasodilator and mild diuretic, which may cause a lowering of the blood pressure. It also causes contraction of non-vascular smooth muscle in the bronchus and gut, increases vascular permeability and is also involved in the mechanism of pain. 