1. Introduction The history of hypertensive therapy with drugs goes back to around 1900 or even earlier, when physicians began to prescribe a variety of medicines such as sodium thiocyanate, nitrites, alkaloids of ergot, pyrogens, rauwolfia, veratrum virile, barbiturates, bismuth, bromides, hexamethonium, or tetramethylammonium chloride. Most of these agents were ineffective and many were poorly…