Related Experiment Videos

Antihypertensive efficacy of olmesartan medoxomil alone and in combination with hydrochlorothiazide

Steven G Chrysant1, George S Chrysant

  • 1University of Oklahoma School of Medicine & Oklahoma Cardiovascular and Hypertension Center, Oklahoma City, OK, USA. schrysant@yahoo.com

Expert Opinion on Pharmacotherapy
|March 12, 2004
PubMed

Insights

Angiotensin receptor blockers (ARBs) effectively lower blood pressure and improve cardiovascular outcomes. This class of antihypertensive drugs, including olmesartan medoxomil, offers advantages over ACE inhibitors.

Area of Science:

  • Pharmacology
  • Cardiovascular Medicine
  • Nephrology

Background:

  • Angiotensin receptor blockers (ARBs) are established antihypertensive agents with favorable safety profiles.
  • ARBs demonstrate efficacy in reducing cardiovascular morbidity and mortality, particularly in patients with heart failure or diabetic nephropathy.
  • The American Diabetes Association endorses ARBs as a primary treatment for hypertensive patients with diabetic nephropathy.

Purpose of the Study:

  • To review the mechanism of action and clinical benefits of ARBs.
  • To highlight the advantages of ARBs over angiotensin-converting enzyme (ACE) inhibitors.
  • To discuss the efficacy and safety of olmesartan medoxomil, a specific ARB, and its combination therapy.

Main Methods:

  • Review of existing literature on ARBs and their clinical applications.
  • Comparison of the mechanism of action of ARBs and ACE inhibitors.
  • Evaluation of clinical trial data for olmesartan medoxomil and combination therapies.

Main Results:

  • ARBs block angiotensin-II (A-II) binding to its receptor, inhibiting A-II's action.
  • ARBs provide effective A-II inhibition irrespective of the production pathway (ACE-dependent or independent).
  • Olmesartan medoxomil is a safe, well-tolerated, long-acting antihypertensive agent. Combination therapy with a diuretic enhances blood pressure reduction.

Conclusions:

  • ARBs offer a distinct therapeutic advantage over ACE inhibitors due to their mechanism of action.
  • Olmesartan medoxomil, alone or in combination with a diuretic, is effective in achieving blood pressure goals.
  • ARBs are crucial in managing hypertension, especially in patients with comorbidities like heart failure and diabetic nephropathy.

Related Concept Videos

Heart Failure Drugs: Inhibitors of Renin-Angiotensin System01:26

Heart Failure Drugs: Inhibitors of Renin-Angiotensin System

The activation of the sympathetic nervous system and the renin-angiotensin-aldosterone system (RAAS) contributes to cardiac remodeling, and inhibiting the RAAS is a pharmacological target in heart failure management. As a result, neurohumoral modulation is a crucial treatment principle for managing heart failure. This approach involves using medications like ACE inhibitors (ACEIs), angiotensin receptor blockers (ARBs), β-blockers, mineralocorticoid receptor antagonists (MRAs), and neutral...
Antihypertensive Drugs: Angiotensin II Receptor Blockers01:30

Antihypertensive Drugs: Angiotensin II Receptor Blockers

In the renin-angiotensin-aldosterone system, a hormone called angiotensin II plays a crucial role. It binds to the AT1 receptors in vascular smooth muscles coupled with Gq proteins. The activation of these receptors activates an enzyme called phospholipase C, which releases two molecules: inositol trisphosphate and diacylglycerol. These molecules cause a chain reaction that leads to the phosphorylation of myosin light chains and promotes interaction between actin and myosin, leading to smooth...
Antihypertensive Drugs: Direct Renin Inhibitors01:25

Antihypertensive Drugs: Direct Renin Inhibitors

The renin-angiotensin-aldosterone system (RAAS) is an intricate physiological pathway involving numerous enzymes and hormones, including renin, angiotensin-converting enzyme (ACE), angiotensin I and II, and aldosterone. Imbalances within this system increase the production of angiotensin II and aldosterone. Increased angiotensin II levels promote vasoconstriction and blood pressure elevation. Concurrently, higher aldosterone levels stimulate sodium and water reabsorption in the kidneys,...
Antihypertensive Drugs: Thiazide-Class Diuretics01:15

Antihypertensive Drugs: Thiazide-Class Diuretics

Thiazide diuretics are sulfonamide derivatives featuring a benzothiadiazine ring system in their molecular structure. Based on this structure, thiazide diuretics can be categorized into two groups: thiazide-type and thiazide-like diuretics. Thiazide-type diuretics, including hydrochlorothiazide and chlorothiazide, consist of a benzothiadiazine backbone with an attached sulfonamide group. Thiazide-like diuretics, such as chlorthalidone and indapamide, lack the thiazide ring but demonstrate...
Antihypertensive Drugs: Vasodilators01:23

Antihypertensive Drugs: Vasodilators

Vasodilators, primarily affecting the smooth muscles within arterial and venous walls, are commonly used for hypertension treatment. Medications such as minoxidil and hydralazine primarily target arteries and arterioles, while sodium nitroprusside acts on arterioles and venules. Minoxidil, functioning as a prodrug, is metabolized by hepatic sulfotransferase into its active form, minoxidil sulfate, after oral administration. This metabolite binds to the sulfonylurea receptor (SUR) component of...
Dose-Response Relationship: Potency and Efficacy01:22

Dose-Response Relationship: Potency and Efficacy

The potency of a drug is the measure of its ability to produce a biological response and can be compared by looking at the half-maximum effective concentration or EC50 values of different drugs. A lower EC50 value indicates higher potency of the drug. In the dose–response curve of two antihypertensive drugs, candesartan and irbesartan, a significant difference is observed in their EC50 values. A lower EC50 value for candesartan indicates that it is more potent than irbesartan, as it produces...