Angiotensin II receptor antagonists work by antagonizing the activation of angiotensin receptors. Renin is an enzyme which regulates angiotensin and aldosterone levels. Angiotensin IV is a hexapeptide that, like angiotensin III, has some lesser activity. ACE inhibitors, and angiotensin receptor blockers. Many drugs control blood pressure by interfering with angiotensin or aldosterone. Hypertension is treated with angiotensin converting enzyme inhibitors (ACEIs) or angiotensin receptor blockers (ARBs). Suppression of angiotensin II leads to a decrease in aldosterone levels. Diuresis is controlled by antidiuretics such as vasopressin, angiotensin II and aldosterone. CRH acts synergistically with arginine vasopressin, angiotensin II, and epinephrine. He was on an angiotensin converting enzyme inhibitor, enalapril. Certain enzymes are capable of breaking down bradykinin (Angiotensin Converting Enzyme, Aminopeptidase P). It consists of the neprilysin inhibitor sacubitril and the angiotensin receptor blocker valsartan. It converts the hormone angiotensin I to the active vasoconstrictor angiotensin II. I to angiotensin II, and hydrolyse bradykinin.