Class: Angiotensin II Receptor Antagonists
VA Class: CV805
Chemical Name: Cyclic 2,3 carbonate 2,3 - dihydroxy - 2 - butenyl - 4 - (1 - hydroxy - 1 - methylethyl) - 1 - propyl - 1 - [p - (o - 1H - tetrazol - 5 - ylphenyl)benzyl]imidazole - 5 - carboxylate
Molecular Formula: C29H30N6O6
CAS Number: 144689-63-4
Brands: Azor (combination), Benicar, Benicar HCT
May cause fetal and neonatal morbidity and mortality if used during pregnancy.1 31 42 43 44 (See Fetal/Neonatal Morbidity and Mortality under Cautions.)
If pregnancy is detected, discontinue the drug as soon as possible.1 31 43 44
Introduction
Olmesartan is an angiotensin II type 1 (AT1) receptor antagonist.1 2 3 16 28 31 44
Uses for Olmesartan Medoxomil
Hypertension
Olmesartan is used for management of hypertension (alone or in combination with other classes of antihypertensive agents);1 2 3 8 9 28 31 44 may be used in fixed combination with amlodipine or hydrochlorothiazide when such combined therapy is indicated.31 44
Angiotensin II receptor antagonists are one of several preferred initial therapies in hypertensive patients with chronic kidney disease, diabetes mellitus, or heart failure.30
Angiotensin II receptor antagonists can be used as monotherapy for initial management of uncomplicated hypertension; however, thiazide diuretics are preferred by JNC 7.30
Diabetic Nephropathy
Angiotensin II receptor antagonists or ACE inhibitors are first-line agents in the treatment of diabetic nephropathy† in patients with type 2 diabetes mellitus and hypertension.
CHF
Angiotensin II receptor antagonists are second-line agents in the treatment of CHF†; should be used only in those intolerant of ACE inhibitors.
Olmesartan Medoxomil Dosage and Administration
General
Hypertension
Administration
Oral Administration
Administer olmesartan orally once daily without regard to meals.1 2
Dosage
Olmesartan is available as olmesartan medoxomil; dosage expressed in terms of the salt.1 31 44
Adults
Hypertension
Olmesartan Therapy for Hypertension
Oral
Initially, olmesartan medoxomil 20 mg once daily in adults without intravascular volume depletion.1 Adjust dosage at approximately monthly intervals (more aggressively in high-risk patients) to achieve BP control.4 30
Usual olmesartan medoxomil dosage: 20–40 mg once daily; no additional therapeutic benefit with higher dosages1 30 or with twice-daily dosing.1 28
Olmesartan/Amlodipine Fixed-combination Therapy for Hypertension
Oral
If BP is not adequately controlled by monotherapy with olmesartan (or another angiotensin II receptor antagonist) or amlodipine (or another dihydropyridine-derivative calcium-channel blocker), can switch to the fixed-combination preparation containing olmesartan medoxomil 20 mg and amlodipine 5 or 10 mg or, alternatively, olmesartan medoxomil 40 mg and amlodipine 5 or 10 mg.44
Can use the fixed combination as a substitute for the individually titrated drugs.44 Can switch to the fixed-combination preparation containing the corresponding individual doses of olmesartan and amlodipine; alternatively, can increase the dosage of one or both components for additional antihypertensive effects.44
Adjust dosage of olmesartan/amlodipine fixed combination, up to a maximum dosage of olmesartan medoxomil 40 mg and amlodipine 10 mg daily, according to patient’s response after ≥2 weeks at the current dosage.44
Olmesartan/Hydrochlorothiazide Fixed-combination Therapy for Hypertension
Oral
If BP is not adequately controlled by monotherapy with olmesartan or hydrochlorothiazide, can switch to fixed-combination olmesartan/hydrochlorothiazide tablets.31 In patients already receiving olmesartan, initiate hydrochlorothiazide at dosage of 12.5 mg once daily; in those receiving hydrochlorothiazide, consider reducing hydrochlorothiazide dosage to 12.5 mg and initiate olmesartan medoxomil at dosage of 20 mg once daily.31 Increase dosages to olmesartan medoxomil 40 mg and hydrochlorothiazide 25 mg once daily, if needed, to control BP.31
If BP is controlled with olmesartan and hydrochlorothiazide (administered separately), can switch to the fixed-combination preparation containing the corresponding individual doses for convenience.31
Adjust dosage of olmesartan/hydrochlorothiazide fixed combination according to patient’s response after 2–4 weeks at the current dosage.31
Special Populations
The following information addresses dosage of olmesartan in special populations. Dosages of drugs administered in fixed combination with olmesartan also may require adjustment in certain patient populations; the need for such dosage adjustments must be considered in the context of cautions, precautions, and contraindications specific to that population and drug.31 44
Hepatic Impairment
No adjustment of initial olmesartan dosage necessary in patients with moderate to severe hepatic impairment.1 31
Amount of amlodipine in olmesartan/amlodipine fixed combinations exceeds the recommended initial dosage of amlodipine (2.5 mg daily) in patients with hepatic impairment.44
Renal Impairment
Manufacturer states that no adjustment of initial olmesartan dosage is necessary in patients with moderate to severe renal impairment (Clcr <40 mL/minute).1 31 44 However, some clinicians recommend lower initial dosage in patients with Clcr <20 mL/minute, with maximum dosage of 20 mg once daily in such patients.10
Dosage of olmesartan in patients with end-stage renal disease not determined.29
Olmesartan/hydrochlorothiazide fixed combination not recommended in patients with severe renal impairment (Clcr ≤30 mL/minute).31 Loop diuretics are preferred to thiazides in these patients.31
Geriatric Patients
No adjustment of initial olmesartan dosage is necessary.1 31
Amount of amlodipine in olmesartan/amlodipine fixed combinations exceeds the recommended initial dosage of amlodipine (2.5 mg daily) in patients ≥75 years of age.44
Volume- and/or Salt-depleted Patients
Correct volume and/or salt depletion prior to initiation of olmesartan therapy or initiate therapy under close medical supervision using lower initial dosage.1 31 44
Cautions for Olmesartan Medoxomil
Contraindications
Known hypersensitivity to olmesartan or any ingredient in the formulation.1 31
When olmesartan is used in fixed combination with hydrochlorothiazide or amlodipine, consider contraindications associated with the concomitant agent.31 41
Warnings/Precautions
Warnings
Cardiovascular Effects
Possible symptomatic hypotension with olmesartan, particularly in volume- and/or salt-depleted patients (e.g., those treated with diuretics).1 31 44 (See Volume- and/or Salt-Depleted Patients under Dosage and Administration.)
Transient hypotension is not a contraindication to additional doses; may reinstate olmesartan therapy cautiously after BP is stabilized (e.g., with volume expansion).1 31 44
Results of 2 randomized controlled trials in patients with type 2 diabetes mellitus showed an increased risk of death from cardiovascular causes (e.g., MI, sudden death, stroke) in patients receiving olmesartan compared with placebo.124 FDA is continuing to evaluate the data and has not concluded that the drug increases risk of cardiovascular death.124 Numerous controlled studies have evaluated olmesartan and other angiotensin II receptor antagonists in patients at high risk of cardiovascular events and have not suggested an increased risk of cardiovascular mortality.124 Because benefits of olmesartan in hypertensive patients continue to outweigh potential risks, FDA states that patients should continue to take the drug as prescribed unless otherwise instructed by a clinician.124
Fetal/Neonatal Morbidity and Mortality
Possible fetal and neonatal morbidity and mortality when drugs that act directly on the renin-angiotensin system (e.g., angiotensin II receptor antagonists, ACE inhibitors) are used during the second and third trimesters of pregnancy.1 4 31 43 44 (See Boxed Warning.) ACE inhibitors also may increase the risk of major congenital malformations when administered during the first trimester of pregnancy.42 43
Discontinue olmesartan as soon as possible when pregnancy is detected, unless continued use is considered lifesaving.1 31 42 43 44 Nearly all women can be transferred successfully to alternative therapy for the remainder of their pregnancy.13
Malignancies
In July 2010, FDA initiated a safety review of angiotensin II receptor antagonists after a published meta-analysis found a modest but statistically significant increase in risk of new cancer occurrence in patients receiving an angiotensin II receptor antagonist compared with control.120 121 123 126 However, subsequent studies, including a larger meta-analysis conducted by FDA, have not shown such risk.126 127 128 129 Based on currently available data, FDA has concluded that angiotensin II receptor antagonists do not increase the risk of cancer.126
Sensitivity Reactions
Anaphylactoid reactions and/or angioedema possible with angiotensin II receptor antagonists;1 2 7 14 extreme caution in patients with a history of angioedema associated with or unrelated to ACE inhibitor or angiotensin II receptor antagonist therapy.7 15 45
General Precautions
Use of Fixed Combinations
When olmesartan is used in fixed combination with amlodipine or hydrochlorothiazide, consider cautions, precautions, contraindications, and interactions associated with the concomitant agent.31 44 Consider cautionary information applicable to specific populations (e.g., pregnant or nursing women, individuals with hepatic or renal impairment, geriatric patients) for each drug in the fixed combination.31 44
Renal Effects
Possible oliguria, progressive azotemia and, rarely, acute renal failure and/or death in patients with severe CHF.1 31 44
Increases in BUN and Scr possible in patients with unilateral or bilateral renal artery stenosis.1 31 44
Specific Populations
Pregnancy
Olmesartan: Category C (1st trimester); Category D (2nd and 3rd trimesters).1 31 44 (See Boxed Warning.)
Lactation
Olmesartan is distributed into milk in rats; not known whether olmesartan is distributed into human milk.1 31 44 Discontinue nursing or the drug.1 31 44
Pediatric Use
Safety and efficacy of olmesartan alone or in fixed combination with amlodipine or hydrochlorothiazide not established.1 31 44
Geriatric Use
No substantial differences in safety or efficacy of olmesartan alone or in fixed combination with amlodipine relative to younger adults, but increased sensitivity cannot be ruled out.1 44
Insufficient experience with olmesartan given in fixed combination with hydrochlorothiazide in patients ≥65 years of age to determine whether geriatric patients respond differently than younger adults; select dosage with caution.31
Hepatic Impairment
Systemic exposure to olmesartan may be increased.1 31 44 (See Special Populations under Absorption, in Pharmacokinetics.)
Renal Impairment
Systemic exposure to olmesartan may be increased.1 31 44 (See Special Populations under Absorption, in Pharmacokinetics.) Some clinicians recommend initial dosage adjustment in patients with severe renal impairment.10 (See Renal Impairment under Dosage and Administration.)
Use of olmesartan in fixed combination with hydrochlorothiazide is not recommended in patients with Clcr ≤30 mL/minute.31
Deterioration of renal function may occur.1 31 44 (See Renal Effects under Cautions.)
Blacks
BP reduction with olmesartan may be smaller in black patients compared with nonblack patients; use in combination with a diuretic.1 5 30 31
Common Adverse Effects
Olmesartan: Dizziness,1 2 3 back pain,1 bronchitis,1 2 12 diarrhea1 , headache,1 2 3 12 hematuria,1 hyperglycemia,1 hypertriglyceridemia,1 influenza-like symptoms,1 2 12 pharyngitis,1 rhinitis,1 sinusitis,1 upper respiratory tract infection.2 3 12
Interactions for Olmesartan Medoxomil
The following information addresses potential interactions with olmesartan. When olmesartan is used in fixed combination with hydrochlorothiazide or amlodipine, consider interactions associated with the concomitant agent.31 44
Olmesartan is not metabolized by and does not inhibit or induce CYP isoenzymes.1 2
Specific Drugs
Drug
|
Interaction
|
---|
Antacids
|
Pharmacokinetic interactions unlikely1 2 28
|
Digoxin
|
Pharmacokinetic interactions unlikely1 2 28
|
Hydrochlorothiazide
|
Pharmacokinetic interactions unlikely1 2 28
Additive hypotensive effects1 31
|
Warfarin
|
Pharmacokinetic interaction unlikely1 2 28
|
Olmesartan Medoxomil Pharmacokinetics
Absorption
Bioavailability
Olmesartan medoxomil (prodrug) is rapidly and completely hydrolyzed to olmesartan during absorption in the GI tract.1 31 44
Absolute bioavailability of olmesartan is about 26%.1 31 44
Peak plasma olmesartan concentration generally reached 1–2 hours following oral administration.1 31 44
Onset
Antihypertensive effect of olmesartan is evident within 2 weeks, with maximum BP reduction after 4–6 weeks.1 3
Food
Food does not affect bioavailability of olmesartan.1 31 44
Special Populations
In patients with moderate hepatic impairment, peak plasma concentration of olmesartan is increased; AUC increased by about 60%.1 31 44
In patients with severe renal impairment (Clcr <20 mL/minute), plasma concentrations and AUC of olmesartan are increased.1 31 44 After repeated dosing, AUC values are approximately triple those in patients with normal renal function.1 31 44
In women, peak plasma concentration and AUC of olmesartan are about 10–15% higher than values in men.1 31 44
Distribution
Extent
Olmesartan crosses the placenta and is distributed in the fetus in animals.1 31 44
Olmesartan crosses the blood-brain barrier poorly, if at all, in animals.1 31 44
Olmesartan is distributed into milk in rats; not known whether olmesartan is distributed into human milk.1 31 44
Plasma Protein Binding
Olmesartan: 99%.1 31 44
Elimination
Metabolism
Olmesartan medoxomil undergoes rapid and complete ester hydrolysis to olmesartan.1 2 28 31 44 Virtually no further metabolism of olmesartan occurs; not metabolized by CYP isoenzymes.1 2 28 31 44
Elimination Route
Olmesartan is eliminated mainly in urine (35–50%) and feces (via bile).1 2 31 44
Half-life
Biphasic; terminal half-life of olmesartan is approximately 13 hours.1 31 44
Special Populations
In geriatric patients, renal clearance of olmesartan is decreased by approximately 30%.1 31 44
Stability
Storage
Oral
Tablets
Olmesartan or olmesartan/hydrochlorothiazide fixed combination: 20–25°C.1 31
Olmesartan/amlodipine fixed combination: 25ºC (may be exposed to 15–30ºC).44
Actions
Olmesartan medoxomil (prodrug) has little pharmacologic activity until hydrolyzed to olmesartan during absorption.1 2 31 44
Olmesartan blocks the physiologic actions of angiotensin II, including vasoconstrictor and aldosterone-secreting effects.1 31 44
Olmesartan does not interfere with response to bradykinins and substance P.1 31 44
Advice to Patients
When olmesartan is used in fixed combination with hydrochlorothiazide or amlodipine, importance of advising patients of important precautionary information about the concomitant agent.31 44
Risks of use during pregnancy.1 31 42 43 44
Importance of women informing their clinician if they are or plan to become pregnant or plan to breast-feed.1 31 44
Preparations
Excipients in commercially available drug preparations may have clinically important effects in some individuals; consult specific product labeling for details.
Olmesartan Medoxomil
Routes
|
Dosage Forms
|
Strengths
|
Brand Names
|
Manufacturer
|
---|
Oral
|
Tablets, film-coated
|
5 mg
|
Benicar
|
Daiichi-Sankyo
|
|
|
20 mg
|
Benicar
|
Daiichi-Sankyo
|
|
|
40 mg
|
Benicar
|
Daiichi-Sankyo
|
Olmesartan Medoxomil Combinations
Routes
|
Dosage Forms
|
Strengths
|
Brand Names
|
Manufacturer
|
---|
Oral
|
Tablets
|
20 mg with Amlodipine Besylate 5 mg (of amlodipine)
|
Azor
|
Daiichi-Sankyo
|
|
|
20 mg with Amlodipine Besylate 10 mg (of amlodipine)
|
Azor
|
Daiichi-Sankyo
|
|
|
40 mg with Amlodipine Besylate 5 mg (of amlodipine)
|
Azor
|
Daiichi-Sankyo
|
|
|
40 mg with Amlodipine Besylate 10 mg (of amlodipine)
|
Azor
|
Daiichi-Sankyo
|
|
Tablets, film-coated
|
20 mg with Hydrochlorothiazide 12.5 mg
|
Benicar HCT
|
Daiichi-Sankyo
|
|
|
40 mg with Hydrochlorothiazide 12.5 mg
|
Benicar HCT
|
Daiichi-Sankyo
|
|
|
40 mg with Hydrochlorothiazide 25 mg
|
Benicar HCT
|
Daiichi-Sankyo
|
Comparative Pricing
This pricing information is subject to change at the sole discretion of DS Pharmacy. This pricing information was updated 01/2012. Actual costs to patients will vary depending on the use of specific retail or mail-order locations and health insurance copays.
Azor 10-20MG Tablets (SANKYO): 30/$117.76 or 90/$340.05
Azor 10-40MG Tablets (SANKYO): 90/$442.99 or 270/$1,298.97
Azor 5-20MG Tablets (SANKYO): 30/$121.06 or 90/$349.97
Azor 5-40MG Tablets (SANKYO): 30/$154.35 or 90/$450.93
Benicar 20MG Tablets (SANKYO): 30/$93.99 or 90/$270.96
Benicar 40MG Tablets (SANKYO): 30/$128.99 or 90/$371.99
Benicar 5MG Tablets (SANKYO): 30/$77.99 or 90/$225.97
Benicar HCT 20-12.5MG Tablets (SANKYO): 30/$96.99 or 90/$275.96
Benicar HCT 40-12.5MG Tablets (SANKYO): 30/$131.00 or 90/$375.96
Benicar HCT 40-25MG Tablets (SANKYO): 30/$131.00 or 90/$360.98
Tribenzor 20-5-12.5MG Tablets (SANKYO): 30/$118.74 or 90/$330.31
Tribenzor 40-10-25MG Tablets (SANKYO): 30/$152.14 or 90/$433.29
Tribenzor 40-5-12.5MG Tablets (SANKYO): 30/$152.14 or 60/$304.27
Tribenzor 40-5-25MG Tablets (SANKYO): 30/$154.49 or 90/$444.01
Disclaimer
This report on medications is for your information only, and is not considered individual patient advice. Because of the changing nature of drug information, please consult your physician or pharmacist about specific clinical use.
The American Society of Health-System Pharmacists, Inc. and Drugs.com represent that the information provided hereunder was formulated with a reasonable standard of care, and in conformity with professional standards in the field. The American Society of Health-System Pharmacists, Inc. and Drugs.com make no representations or warranties, express or implied, including, but not limited to, any implied warranty of merchantability and/or fitness for a particular purpose, with respect to such information and specifically disclaims all such warranties. Users are advised that decisions regarding drug therapy are complex medical decisions requiring the independent, informed decision of an appropriate health care professional, and the information is provided for informational purposes only. The entire monograph for a drug should be reviewed for a thorough understanding of the drug's actions, uses and side effects. The American Society of Health-System Pharmacists, Inc. and Drugs.com do not endorse or recommend the use of any drug. The information is not a substitute for medical care.
AHFS Drug Information. © Copyright, 1959-2012, Selected Revisions December 23, 2011. American Society of Health-System Pharmacists, Inc., 7272 Wisconsin Avenue, Bethesda, Maryland 20814.
† Use is not currently included in the labeling approved by the US Food and Drug Administration.
References
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38. Frohlich ED. Recognition of systolic hypertension for hypertension. Hypertension. 2000; 35:1019-20. [PubMed 10818055]
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42. Cooper WO, Hernandez-Diaz S, Arbogast PG et al. Major congenital malformations after first-trimester exposure to ACE inhibitors. N Engl J Med. 2006; 354:2443-51. [PubMed 16760444]
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45. Howes LG, Tran D. Can angiotensin receptor antagonists be used safely in patients with previous ACE inhibitor-induced angioedema? Drug Saf. 2002; 25:73-6.
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125. Imai E, Ito S, Haneda M et al. Olmesartan reducing incidence of endstage renal disease in diabetic nephropathy trial (ORIENT): rationale and study design. Hypertens Res. 2006; 29:703-9. [PubMed 17249526]
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128. ARB Trialists Collaboration. Effects of telmisartan, irbesartan, valsartan, candesartan, and losartan on cancers in 15 trials enrolling 138,769 individuals. J Hypertens. 2011; 29:623-35. [PubMed 21358417]
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132. Haller H, Viberti GC, Mimran A et al. Preventing microalbuminuria in patients with diabetes: rationale and design of the Randomised Olmesartan and Diabetes Microalbuminuria Prevention (ROADMAP) study. J Hypertens. 2006; 24:403-8. [PubMed 16508590]
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