<prompt> All of the following are vasodilators exceptMethyl dopaNitroprussideHydralazineDiazoxide  <response>: Methyldopa is a centrally acting alpha-agonist Hydralazine, diazoxide, and nitroprusside are vasodilators. Hydralazine, diazoxide- aeriolar dilators- potassium channel openers Nitroprusside- both aeriolar and venous dilator REF.Essentials of Medical Pharmacology-kD Tripathi 8th ed. 