protoveratrine A and B

pro·to·ver·a·trine A and B

(prō'tō-ver'ă-trēn),
A mixture of two alkaloids isolated from Veratrum album; they exert their main effect on the cardiovascular system through the carotid sinus receptors and vagal sensory endings in the heart; they cause vasodilation and are thought to bring about a redistribution to all vascular beds and thus to induce a fall in blood pressure; used in certain forms of hypertension; the maleates have the same actions.