Source:http://linkedlifedata.com/resource/umls/id/C0051050
NCI: A long-acting, sulfhydryl-containing angiotensin-converting enzyme (ACE) inhibitor with antihypertensive activity. As a prodrug, alacepril is rapidly metabolized to captopril; captopril competitively binds to and inhibits ACE, thereby blocking the conversion of angiotensin I to angiotensin II. This prevents the potent vasoconstrictive actions of angiotensin II and results in vasodilation. Captopril also decreases angiotensin II-induced aldosterone secretion by the adrenal cortex, which leads to an increase in sodium excretion and subsequently increases water outflow.