<prompt> Diuretic used in essential hypeension is -HydrochlohiazideAmilorideFurosemideAcetazolamide  <response>: Low dose thiazide diuretics may be used alone or in combination with other anti hypeensive agents . mechanism of action:they inhibit the Nacl pump in distal convoluted tubule and increase sodium excretion. Drugs used are :Hydrochlohiazide,chlohalidonelong acting and more potent than hydrochlohiazide but potassium loss is greater. They provide additive bp lowering effects with ace inhibitors ,arbs, beta blockers. Addition of diuretic to calcium channel blocker is less effective . Ref:Harrison 20 th edition pg no 1901 