- 1. An agent that causes dilation of the blood vessel s. SYN: vasodilative (2). 2. A nerve, stimulation of which results in dilation of the blood vessel s.
* * *va·so·di·la·tor .vā-zō-'dī-.lāt-ər n an agent (as a parasympathetic nerve fiber or a drug) that induces or initiates vasodilationvasodilator also va·so·di·la·to·ry -'dil-ə-.tōr-ē, -'dī-lə-, -.tȯr- adj relating to, inducing, or initiating vasodilation <a drug with a \vasodilator effect>
* * *n.a drug that causes widening of the blood vessels and therefore an increase in blood flow. Vasodilators are used to lower blood pressure in cases of hypertension. Coronary vasodilators, such as glyceryl trinitrate, increase the blood flow through the heart and are used to relieve and prevent angina. Large doses of coronary vasodilators cause such side-effects as flushing of the face, severe headache, and fainting. Peripheral vasodilators, such as alpha blocker and moxisylyte, affect the blood vessels of the limbs and are used to treat conditions of poor circulation, such as acrocyanosis, chilblains, and Raynaud's disease.
* * *vaso·di·la·tor (va″zo-) (vas″o-diґla-tər) 1. causing dilation of the blood vessels. 2. a motor nerve or chemical compound that causes dilation of the blood vessels.
Medical dictionary. 2011.