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What Is Olmesartan?

Olmesartan is a prescription angiotensin II receptor blocker used to treat high blood pressure, also called hypertension. It is commonly prescribed as olmesartan medoxomil, an oral prodrug that the body converts into active olmesartan. The medication relaxes blood vessels and lowers blood pressure. It is approved for adults and children aged six years and older. Lowering blood pressure reduces the risk of cardiovascular complications such as stroke and heart attack.

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What Is Olmesartan?

Olmesartan is a prescription angiotensin II receptor blocker used to treat high blood pressure, also called hypertension. It is commonly prescribed as olmesartan medoxomil, an oral prodrug that the body converts into active olmesartan. The medication relaxes blood vessels and lowers blood pressure. It is approved for adults and children aged six years and older. Lowering blood pressure reduces the risk of cardiovascular complications such as stroke and heart attack.

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How Does Olmesartan Work?

Olmesartan blocks angiotensin II type 1 receptors in blood vessels and other tissues. Angiotensin II normally causes blood vessels to constrict and stimulates aldosterone release, which influences salt and fluid balance. Blocking these effects helps blood vessels relax and reduces blood pressure. Olmesartan medoxomil is converted into active olmesartan during absorption. This medication does not directly slow the heart rate like a beta blocker and is not intended for immediate treatment of a hypertensive emergency.

Who Is Prescribed Olmesartan?

Olmesartan is prescribed for hypertension in adults and children aged six years and older. It can be used alone or with other blood pressure medications when additional control is needed. A clinician considers kidney function, fluid balance, blood pressure readings, and other medical conditions before prescribing it. Olmesartan should not be used during pregnancy because medications acting on the renin-angiotensin system can seriously harm the developing fetus. Pediatric use follows specific age and weight-based instructions.

How Should Olmesartan Be Taken?

Olmesartan medoxomil tablets are generally taken once daily, with or without food. The usual adult starting dose is 20 mg daily, which can be increased to 40 mg when additional blood pressure reduction is needed. Pediatric dosing depends on body weight. Patients should take the medication consistently and monitor blood pressure as directed. A clinician can assess kidney function and potassium levels during treatment. Do not change the prescribed dose or combine it with other blood pressure medicines without medical guidance.

What Are the Side Effects and Warnings of Olmesartan?

Dizziness is a recognized side effect of olmesartan, particularly when blood pressure falls after starting treatment. Serious risks include fetal injury, low blood pressure, worsening kidney function, and elevated potassium levels. Olmesartan can also cause sprue-like enteropathy, a rare condition involving severe chronic diarrhea and weight loss that can appear months or years after treatment begins. Patients experiencing persistent diarrhea, fainting, or reduced urination should seek medical evaluation. Olmesartan should be discontinued promptly when pregnancy is detected under medical guidance.

Common Questions About Olmesartan

Is olmesartan used for high blood pressure?

Yes. Olmesartan is an angiotensin II receptor blocker approved to treat hypertension in adults and children aged six years and older.

Is olmesartan the same as olmesartan medoxomil?

Olmesartan medoxomil is the oral prodrug that converts into active olmesartan after administration. Both names refer to closely related forms of the same blood pressure treatment.

Can olmesartan cause diarrhea?

Yes. Olmesartan can cause rare sprue-like enteropathy involving severe chronic diarrhea and weight loss. These symptoms require medical evaluation.

Is olmesartan safe during pregnancy?

No. Olmesartan can cause serious fetal injury or death. Patients who become pregnant should contact their healthcare professional immediately.

References

DailyMed - BENICAR (olmesartan medoxomil) tablet, film coated. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=dc3f1fd4-5578-4c5d-be7b-12e3f8f3e7df. Date Accessed October 22, 2026.

Olmesartan. LiverTox. https://www.ncbi.nlm.nih.gov/books/NBK548153/. Date Accessed October 22, 2026.

Olmesartan. MedlinePlus. https://medlineplus.gov/druginfo/meds/a603006.html. Date Accessed October 22, 2026.

Olmesartan. PubChem. https://pubchem.ncbi.nlm.nih.gov/compound/olmesartan. Date Accessed October 22, 2026.

Olmesartan. StatPearls. https://www.ncbi.nlm.nih.gov/books/NBK544367/. Date Accessed October 22, 2026.