Olsartan

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Medically reviewed

Marina Burgos

Last updated on 10/01/2026

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Olsartan

Property Description
Active ingredient Olmesartan Medoxomil
Form Tablet (Oral administration)
Pharmacological class Angiotensin II Receptor Blocker (ARB)
Common purpose Management of high blood pressure (Hypertension)
Origin Synthetic compound / Prodrug

What Type of Medicine is Olsartan?

Olsartan is a synthetic, prescription-only medication classified as an Antihypertensive agent, specifically belonging to the family of Angiotensin II Receptor Blockers (ARBs), which are also known as sartans. This classification places it among drugs that are clinically recognized for providing sustained control over vascular tension. Its primary purpose is the long-term reduction of high blood pressure (Hypertension), which is a key intervention in mitigating serious cardiovascular risk. The use of an ARB represents a common scenario where a patient requires reliable, daily control over systemic blood pressure to maintain cardiovascular health.


Olsartan's Active Ingredient and Form

The core component in Olsartan is the active pharmaceutical ingredient Olmesartan Medoxomil, which is formulated as a single-ingredient product designed for oral administration as a tablet. Olmesartan Medoxomil is functionally unique as a prodrug; it is chemically distinct from its active metabolite, Olmesartan, which performs the therapeutic action after the drug is absorbed and processed by the body. Olmesartan works by blocking the action of certain chemicals that tighten blood vessels. The design ensures a reliable pathway for the compound to take effect, contributing to the consistent management of circulatory resistance.

Regulatory References

  1. NIH DailyMed Label for Olmesartan Medoxomil
  2. MedlinePlus Drug Information

What side effects are possible with Olsartan?

Olsartan: Possible Side Effects and Safety Information

This section outlines the officially documented adverse reactions and safety constraints for Olsartan, based strictly on governmental regulatory prescribing information. The information details the known risks without providing advice, instructions on use, or therapeutic indications.


Adverse Reactions by Frequency

Adverse reactions are classified by how often they were reported in studies or post-marketing surveillance:

Classification Examples of Documented Adverse Reactions
Common (1 in 100 to 1 in 10) Dizziness, headache, fatigue, upper respiratory tract infections, rhinitis.
Uncommon (1 in 1,000 to 1 in 100) Vertigo, rash, pruritus, angioedema.
Rare (1 in 10,000 to 1 in 1,000) Acute renal failure, hyperkalemia.

These side effects are also grouped by the System-Organ-Class (SOC) affected, including the Nervous System, Renal and Urinary Disorders, and Gastrointestinal Disorders.


Serious Adverse Reactions and Safety Constraints

Serious Adverse Reactions: The regulatory labeling documents rare but clinically significant events such as Angioedema (severe swelling of the face, lips, or tongue) and Acute Renal Failure (sudden worsening of kidney function).

Population-Specific Safety: Olsartan is contraindicated (should not be used) during the second and third trimesters of pregnancy due to the risk of fetal harm. Use in patients with severe hepatic impairment is also not recommended or contraindicated. Patients with any degree of renal impairment require careful monitoring of serum potassium and creatinine.

Safety Monitoring and Patterns: Regulatory documents note that hypotension (low blood pressure) may be more likely during the initial phase of treatment, particularly in patients with pre-existing volume depletion. Routine monitoring of serum potassium and creatinine is required to mitigate risks like hyperkalemia.

Overdose and Emergency Response

Overdose and When to Seek Help

Official government regulatory information outlines the anticipated effects and necessary immediate responses in the event of an olmesartan overdosage. This information focuses strictly on acute toxic exposure and emergency procedures.


Documented Overdose Manifestations

An overdose of olmesartan is most likely to result in effects related to severe lowering of blood pressure (hypotension). The following clinical manifestations have been documented in regulatory prescribing information:

  • Profound Hypotension: Markedly low blood pressure is the primary anticipated sign of overdosage.
  • Tachycardia: A fast heartbeat may occur as a reflex response to the severe drop in blood pressure.
  • Bradycardia: A slow heartbeat may also occur.

Immediate Actions and Emergency Response

Urgent medical assistance is required if an overdosage is suspected or confirmed. Regulatory documents provide specific instructions for managing the effects of severe hypotension caused by this medication:

  • Seek Immediate Help: Contact a regional Poison Control Centre or emergency services immediately for management of a suspected drug overdose.
  • Patient Positioning: If severe hypotension occurs, the patient should be placed in the supine position (lying face-up).
  • Supportive Care: If necessary to counteract the low blood pressure, an intravenous infusion of normal saline may be administered by healthcare professionals.

This medication is not known to be removed from the body through hemodialysis. The focus of overdose management is stabilization of the cardiovascular system.

Therapeutic Uses of Olsartan

Olsartan (Olmesartan medoxomil) is an agent used in situations involving certain distressing symptoms associated with high blood pressure (hypertension). It is used across domains where additional symptomatic support is needed. The core purpose of this therapeutic domain is the management of elevated blood pressure, which may assist with maintaining functional stability.

The medication is commonly used across conditions presenting with acute episodes, and is applied in scenarios where additional management of discomfort is required. Its action is considered relevant because it contributes to easing the overall symptom burden of heightened physiological activity that can affect the cardiovascular system.

Olsartan may also be applied in addressing several conditions where symptoms become temporarily overwhelming, including essential hypertension, management of symptoms linked to organ-specific functional stress (like diabetic nephropathy in patients with Type 2 diabetes), and sometimes it supports patients dealing with heart failure. Its use helps address symptom clusters that may become intense or disruptive.

“It provides supportive relief when symptoms interfere with routine activities and contributes to improved comfort during periods of heightened symptoms.”

Quick Fact: Management for conditions presenting with systemic or localized discomfort

Regulatory References

  1. NIH DailyMed drug label for Olmesartan

Eligibility and Restrictions for Use

Who Can and Cannot Use Olsartan?

Eligibility for Olsartan (Olmesartan Medoxomil) is determined by specific criteria concerning age, physiological status, and concurrent conditions as defined by regulatory authorities.

Eligibility Status Population Criteria
Allowed Use Adults (18 years and older); Children and adolescents (6 to less than 18 years).
Contraindicated Use Women in the 2nd and 3rd trimesters of pregnancy; Patients with Biliary Obstruction; Patients with known hypersensitivity.

The medicine is absolutely contraindicated for patients with Diabetes Mellitus or certain renal impairments who are concurrently taking Aliskiren (Dual RAAS inhibition). Olsartan must be discontinued immediately if pregnancy is detected.

Age-Related Eligibility: Use is prohibited in children under 1 year old. Safety and efficacy have not been established for children aged 1 to 5 years, making use in this group not recommended.

Conditional Use & Restrictions: Olsartan is not recommended in cases of severe renal (CrCl < 20 mL/min) or severe hepatic impairment due to limited safety data. Patients with moderate hepatic impairment are restricted to a maximum daily dose of 20 mg.

What should I know about interactions with other medicines?

Olsartan Interactions with other medicines and products

This section outlines the officially documented interaction patterns for Olsartan (Olmesartan Medoxomil), based strictly on government regulatory documents such as those from the FDA and European SmPC. This information defines necessary restrictions and cautions regarding co-administration.


Formally Contraindicated Combinations

Co-administration is strictly prohibited in specific patient groups due to the significant risks associated with Dual Blockade of the Renin-Angiotensin System (RAS).

  • Aliskiren: Contraindicated in patients with diabetes mellitus or those with renal impairment (Glomerular Filtration Rate < 60 mL/min/1.73 m^2).

Pharmacodynamic and Exposure-Altering Interactions

Interactions that affect the physiological response or alter the drug's concentration are officially noted:

  • Lithium: Concomitant use is generally not recommended, as it can lead to increased serum lithium concentrations and heightened risk of toxicity.
  • NSAIDs: Non-steroidal Anti-inflammatory Drugs, including selective COX-2 inhibitors, may attenuate the antihypertensive effect and increase the risk of worsening renal function.
  • Potassium-Sparing Agents: Concurrent use with diuretics like spironolactone or potassium supplements increases the risk of hyperkalemia.
  • Colesevelam Hydrochloride: This bile acid sequestrant is documented to reduce the systemic exposure and peak plasma concentration ( C max) of olmesartan. Regulators advise that Olsartan be administered at least 4 hours prior to the Colesevelam dose to minimize this effect.

Mechanism of Action

Olsartan is an angiotensin II receptor blocker (ARB) which modulates the renin-angiotensin-aldosterone system (RAAS).

Its active metabolite, olmesartan, acts as a selective, competitive antagonist for the Angiotensin II type 1 (AT1) receptor. This receptor is a G-protein-coupled receptor primarily located in vascular smooth muscle, the adrenal gland, and renal tissues. Olmesartan blocks the binding of the endogenous ligand, angiotensin II, to the AT1 receptor.

This blockade prevents the typical intracellular signaling cascade, which involves activation of phospholipase C and subsequent elevation of intracellular calcium. Consequently, the inhibition of the AT1 receptor prevents:

  • Vascular Smooth Muscle contraction, leading to vasodilation.
  • Adrenal Gland stimulation, resulting in reduced synthesis and release of aldosterone.

The systemic consequences of this AT1 receptor antagonism are a decrease in total peripheral resistance and reduced aldosterone-mediated sodium and water reabsorption in the distal nephron, which collectively modulates systemic blood pressure.

Dosage and Administration Information

Olsartan (Olmesartan Medoxomil) is approved for oral administration as a tablet. The medicine is designed to be administered once daily (QD), and for consistent usage, it is recommended that the dose be taken at approximately the same time each day. The tablets must be swallowed whole with fluid and should not be chewed or crushed. Olsartan may be taken with or without food, as its labeled use permits flexibility concerning meals.

The standard starting dose for adult patients with hypertension is 20 mg once daily. If required, the dosage may be adjusted upward to a maximum of 40 mg once daily. Any decision to adjust the dose is procedurally considered after a minimum of two weeks of therapy, which allows sufficient time to assess the blood pressure response.

Specific constraints apply to certain populations and co-administered medicines. For patients with moderate hepatic or renal impairment, the maximum allowable dose is restricted to 20 mg once daily. For pediatric patients between 6 and 18 years, the starting dose is determined based on body weight. When Olsartan is taken alongside the bile acid sequestering agent Colesevelam, Olsartan is administered at least 4 hours prior to the other agent.

Recent Clinical Evidence

Research evidence / Overview of Studies for Olsartan


Evidence for Use in High Blood Pressure (Essential Hypertension)

Olsartan has been evaluated in short-term, controlled clinical trials to understand how it relates to high blood pressure measurements. These studies, known as Randomized Controlled Trials (RCTs), often compare the drug against an inactive substance (placebo) or another active comparator. Researchers examined key physical measurements, primarily focusing on the change in seated systolic and diastolic blood pressure (BP) over defined time intervals. The primary evidence is based on follow-up durations that were limited to only a few weeks, meaning there is limited information for long-term outcomes that measure the sustained patterns of the drug over many years.

Evidence for Use in Type 2 Diabetes and Kidney Damage

Research has explored the relationship between Olsartan use and outcomes related to organ-specific functional stress in patients with Type 2 diabetes who show early signs of kidney damage. These investigations involved large-scale, long-term RCTs that monitored participants over several years. The overall findings regarding the composite long-term endpoints (such as kidney function decline) were mixed and did not establish a specific finding when compared to standard treatment. The same trials reported an unexpected pattern of increased cardiovascular deaths in the Olsartan groups when compared to the placebo groups in this specific, high-risk population, representing a documented area of research limitation.

Analysis of Secondary and Exploratory Findings

Beyond the primary use in hypertension, Olsartan was observed in exploratory studies and secondary analyses of trials designed for other primary endpoints, such as in the context of heart failure. The evidence base for heart failure is considered limited and is mainly based on extrapolation from the research structure of similar medications, as a dedicated large-scale RCT focused only on heart failure has not been conducted for Olsartan.

Areas of Research Uncertainty and Study Limitations

The research for Olsartan, while documenting its clinical evaluation, highlights several areas where data are still emerging. A key limitation is that comparative evidence is lacking for the specific modification of hard cardiovascular events (like heart attacks or strokes) in the general hypertension population; this outcome is primarily inferred from the general relationship between blood pressure modification and cardiovascular events. Furthermore, the certainty remains low regarding the long-term characterization of outcomes in the specific high-risk diabetic kidney group.

Key Studies & References

  1. Olmesartan medoxomil tablet, film coated. NIH DailyMed Drug Label

Frequently Asked Questions (FAQ)

Common questions about Olsartan (FAQ)

Q: Does Olsartan have a generic version available?

A: According to official drug information, the active ingredient in Olsartan, Olmesartan Medoxomil, is commonly available as a generic version. Generic versions typically offer a lower-cost alternative while containing the same active ingredient.


Q: What are other common names for Olsartan?

A: Olsartan is a simplified name for the active ingredient, Olmesartan Medoxomil. Depending on the country, this medicine may be sold under common brand names such as Benicar or Olmetec.


Q: How quickly is Olsartan expected to start working?

A: Official studies indicate that the initial blood pressure lowering effect begins within one week of starting treatment. The full therapeutic response is often observed after two weeks of consistent, once-daily therapy.


Q: Does Olsartan interact with alcohol?

A: Regulatory drug interaction documents note that alcohol consumption may have an additive effect in lowering blood pressure. Official documents describe that combining the drug with alcohol may potentiate blood pressure lowering effects, increasing the potential for symptoms like dizziness or lightheadedness.


Q: Can people with diabetes take Olsartan?

A: Official product information states that Olsartan is absolutely contraindicated (must not be used) in patients with diabetes mellitus who are also taking the drug Aliskiren. Excluding the strictly contraindicated use, eligibility for other diabetic patients is determined by the healthcare provider.


Q: Is Olsartan suitable for older adults?

A: Pharmacokinetics studies comparing young adults and the elderly (age 65 and over) show that the drug's maximum concentration in the blood is similar. However, modest accumulation of the drug in the system has been observed after repeated doses in the elderly population.


Q: Is Olsartan described as safe to use while breastfeeding?

A: Regulatory documents state that it is unknown if the active metabolite, olmesartan, is excreted into human milk. Because the potential effects on a nursing infant are unknown, official guidance notes that a choice should be considered between discontinuing nursing or discontinuing the drug.


Q: What is the difference between Olsartan and other similar blood pressure drugs (e.g., those ending in '-pril' or another '-sartan')?

A: Olsartan is classified as an Angiotensin II Receptor Blocker (ARB). It works by selectively blocking the action of Angiotensin II. This mechanism differs from ACE inhibitors (often ending in '-pril'), which block the enzyme responsible for creating Angiotensin II in the first place.


Q: Is Olsartan used to treat conditions other than high blood pressure?

A: The FDA label and other official regulatory documents approve Olsartan only for the treatment of hypertension (high blood pressure). Although it may be explored in clinical trials for other purposes, any other uses are not considered approved indications.


Q: Why do official documents state that Olsartan cannot be used during the second and third trimesters of pregnancy?

A: Official documents describe that use during the second and third trimesters is associated with a risk of fetal harm due to reduced fetal kidney function. This may lead to oligohydramnios (low amniotic fluid). Potential adverse effects reported in newborns include skull hypoplasia, anuria, renal failure, and death.


Q: Can Olsartan affect sleep or cause insomnia?

A: Regulatory documents list insomnia (difficulty sleeping) as an uncommon adverse reaction associated with the use of this medicine. Uncommon reactions are typically reported in 1 in 100 to 1 in 1,000 users.


Q: What is the full list of ingredients in the Olsartan tablet?

A: The active ingredient is Olmesartan Medoxomil. The tablets also contain inactive ingredients, which are listed in the official description section and generally include binding agents like microcrystalline cellulose, lactose monohydrate, and magnesium stearate. The exact list may vary by product manufacturer.


Q: Are there any food components that are described in official documents as affecting the absorption of Olsartan?

A: Official documents note that the bile acid sequestrant, Colesevelam hydrochloride, reduces the amount of Olmesartan absorbed into the body. To minimize this effect, official documents describe that Olsartan should be administered at least four hours prior to a dose of Colesevelam. No common food components are otherwise cited as significantly affecting absorption.


Q: Does Olsartan cause confusion or memory problems?

A: Confusion is not typically listed as a common side effect in its own category. However, confusion can be a symptom of rare but serious adverse reactions, such as severe fluid and electrolyte imbalances (high or low potassium levels) which requires a healthcare provider’s evaluation.


Q: How is Olsartan eliminated from the body?

A: Olmesartan is eliminated via a dual pathway. Approximately 35% to 50% of the absorbed dose is removed via the urine, and the remainder is eliminated in the feces via the bile. The terminal elimination half-life is approximately 13 hours.


Q: What are the signs of an overdose of Olsartan?

A: Regulatory information indicates that the most likely signs of an overdose are related to its main effect: severe hypotension (very low blood pressure). This low blood pressure may be accompanied by a change in heart rate, such as tachycardia (fast heart rate) or bradycardia (slow heart rate).


Q: What is the difference between Olsartan and the common brand name it is sold under?

A: Olsartan is a simplified term for the medicine's active chemical component, Olmesartan Medoxomil. Brand names are the trademarks used by the manufacturer, such as Benicar, under which the medicine is commercially sold.


Q: How long does the effect of one dose of Olsartan last?

A: The blood pressure lowering effect is described as being maintained throughout the 24-hour period with once-daily dosing. Official data indicates the terminal elimination half-life, the time it takes for half the drug to be removed from the body, is approximately 13 hours.

How should Olsartan be stored and disposed of?

Storage and Handling Requirements

Olmesartan tablets must be stored at Controlled Room Temperature, ideally between 20 to 25 C (68 to 77 F), with protection from both moisture and direct light. The container must be kept tightly closed to protect the integrity of the medication. It is essential to prevent the tablets from freezing or being exposed to excessive heat.

For the prepared oral suspension, storage requirements differ; it must be kept refrigerated at 2 to 8 C (36 to 46 F) and discarded after 4 weeks. Before each use, the suspension should be shaken well and promptly returned to refrigeration.

Child-Safety and Disposal

All Olmesartan products must be kept out of the sight and reach of children in a secure location. For disposal, unused or expired medicine should be taken to a drug take-back location. If this is unavailable, mix the medicine with an unappealing substance, such as dirt, seal it in a plastic bag, and dispose of it in the household trash. Do not flush the medication, and avoid releasing it into sewers or waterways.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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