贝那普利游离碱是ACE（血管紧张素转换酶）的抑制剂。这阻止了血管紧张素I向血管紧张素II的转化，继而阻止了与血管紧张素II受体活化相关的血管收缩。ACE抑制导致血管扩张和毛细血管血容量增加。 Benazepril Free base is an inhibitor of ACE (angiotensin-converting enzyme). This blocks the conversion of angiotensin I to angiotensin II, which in turn prevents vasoconstriction associated with activation of angiotensin II receptors. ACE inhibition causes vasodilation and an increase in capillary blood volume.