NCIt definition : 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.;