Benazepril combined with either amlodipine or hydrochlorothiazide is more effective than monotherapy for blood pressure control and prevention of end-organ injury in hypertensive Dahl rats

Ming Sheng Zhou, Edgar A. Jaimes, Leopoldo Raij

Research output: Contribution to journalArticle

18 Scopus citations


We studied the effect of hydrochlorothiazide (HCTZ), the angiotensin-converting enzyme inhibitor benazepril, the calcium channel blocker amlodipine, or a combination of benazepril/amlodipine or benazepril/HCTZ on systolic blood pressure (BP) and end-organ injury (left ventricular hypertrophy, proteinuria, and endothelium-dependent relaxation to acetylcholine) in hypertensive Dahl salt-sensitive rats fed either a normal-salt (0.5% NaCl) or high-salt (4% NaCl) diet for 6 weeks. Rats fed a high-salt diet developed hypertension and significant end-organ injury. Monotherapy with HCTZ (75 mg/L in drinking water) or amlodipine (10 mg/kg/day by gavage) reduced systolic BP and proteinuria; benazepril (40 mg/kg/day by gavage) decreased proteinuria without significantly lowering systolic BP. In rats receiving a high-salt diet, only HCTZ reduced left ventricular hypertrophy, whereas endothelium-dependent relaxation was improved by amlodipine and benazepril but not by HCTZ. Combining benazepril with either amlodipine or HCTZ dramatically reduced systolic BP and end-organ injury. These data clearly support clinical studies suggesting that combination therapy is more effective than monotherapy for systolic BP control and prevention of end-organ injury. Complementary mechanisms of action of agents from different antihypertensive classes appear to facilitate the greater benefit on BP and end-organ injury.

Original languageEnglish (US)
Pages (from-to)857-861
Number of pages5
JournalJournal of Cardiovascular Pharmacology
Issue number1
StatePublished - Jul 1 2006



  • ACE inhibitor
  • Calcium channel blocker
  • Diuretic
  • End-organ injury
  • Endothelial function
  • Hypertension

ASJC Scopus subject areas

  • Pharmacology
  • Cardiology and Cardiovascular Medicine

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