About enalaprilsangiotensin converting enzyme (ace) inhibitor, antihypertensive.smechanism of action of enalaprilsit is a prodrug and converted in to active enalaprilat- which is an angiotensin converting enzyme inhibitor prevents the conversion of angiotensin-1 to angiotensin-2 and abolishes the pressor actions of angiotensin. it decreases aldosterone secretion, sodium and water retention, and total peripheral resistance, leads to fall in bp. the arterioles dilate and the compliance of larger arteries is increased. both systolic and diastolic bp is lowered. it has no effect on cardiac output and cardiovascular reflexes. and there is little dilatation of capacitance vessels- so postural hypotension is not a problem. the drug does not compromise renal, cerebral, and coronary blood flow. the drug also increases plasma kinin levels and potentiate the hypotensive action of exogenously administered bradykinin.