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(Hypertension. 2003;42:1137.)
© 2003 American Heart Association, Inc.

Scientific Contributions

Blood Pressure Lowering in Essential Hypertension With an Oral Renin Inhibitor, Aliskiren

From the Blood Pressure Unit, Beaumont Hospital (A.S., E.O.), Dublin, Ireland; the Department of Clinical Pharmacology, Royal College of Surgeons in Ireland (A.S., E.O.), Dublin, Ireland; Clinical Research, Speedel Pharma AG (C.J.), Basel, Switzerland; and the Division of Hypertension and Vascular Medicine, University Hospital (J.N.), Lausanne, Switzerland.

Correspondence to Dr Alice Stanton, Department of Clinical Pharmacology, Royal College of Surgeons in Ireland, St Stephen’s Green, Dublin 2, Ireland. E-mail astanton{at}rcsi.ie

Inhibition of the first and rate-limiting step of the renin-angiotensin system has long been an elusive therapeutic goal. Aliskiren, the first known representative of a new class of completely nonpeptide, orally active, renin inhibitors, has been shown to inhibit the production of angiotensin I and II in healthy volunteers and to reduce blood pressure (BP) in sodium-depleted marmosets. The aim of this randomized, double-blind, active comparator trial study was to assess the BP-lowering efficacy and safety of aliskiren. Two hundred twenty-six patients, 21 to 70 years of age, with mild to moderate hypertension, were randomly assigned to receive 37.5 mg, 75 mg, 150 mg, or 300 mg aliskiren or 100 mg losartan daily for 4 weeks. Dose-dependent reductions in daytime ambulatory systolic pressure (mean change, mm Hg [SD of change]; -0.4 [11.7], -5.3 [11.3], -8.0 [11.0], and -11.0 [11.0], P=0.0002) and in plasma renin activity (median change % [interquartile range]; -55 [-64, -11], -60 [-82, -46], -77 [-86, -72], and -83 [-92, -71], P=0.0008) were observed with 37.5, 75, 150, and 300 mg aliskiren. The change in daytime systolic pressure with 100 mg losartan (-10.9 [13.8]) was not significantly different from the changes seen with 75, 150, and 300 mg aliskiren. Aliskiren was well tolerated at all doses studied. This study demonstrates that aliskiren, through inhibition of renin, is an effective and safe orally active BP-lowering agent. Whether renin inhibition results in protection from heart attack, stroke, and nephropathy, similar to angiotensin-converting enzyme inhibition and angiotensin receptor blockade, needs to be researched.

Key Words: renin • blood pressure • hypertension, essential • blood pressure monitoring, ambulatory • receptors, angiotensin • losartan

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