Active Ingredient

Olmesartan

Olmesartan is a medication used to manage high blood pressure. It helps to lower the risk of complications associated with hypertension, such as heart attacks and strokes.

By controlling blood pressure, Olmesartan contributes to overall cardiovascular health.

Written By Douglas C. Goldberg, MD

Reviewed By Philip Schein, MD

Last Updated 28 Nov 2025

Available Olmesartan Brands

Benicar

Strengths 10mg, 20mg, 40mg

Olmesartan Uses

Olmesartan is primarily prescribed for managing conditions related to high blood pressure.

Treatment of hypertension (high blood pressure)
Reducing the risk of stroke in patients with high blood pressure
Managing cardiovascular risk in hypertensive patients

How Olmesartan Works

Olmesartan works by blocking the action of a substance in the body called angiotensin II. This substance typically causes blood vessels to narrow.

By inhibiting its effects, Olmesartan helps relax and widen blood vessels, allowing blood to flow more easily.

This mechanism helps lower blood pressure and reduces the strain on the heart.

Common side effects of Olmesartan

Not everyone experiences side effects with Olmesartan, and many side effects are mild and temporary.

Dizziness
Headache
Fatigue
Nausea
Diarrhea
Upper respiratory tract infections
Back pain
Flu-like symptoms

If you experience serious or persistent symptoms, contact your doctor promptly.

Monitor your blood pressure regularly to ensure the medication is working effectively.
Avoid excessive alcohol consumption while taking Olmesartan.
Inform your doctor about any other medications or supplements you are taking to avoid interactions.
Do not use Olmesartan if you experience severe allergic reactions or swelling.
Stay hydrated, especially in hot weather, to prevent dehydration.

Always consult your doctor for personalized medical advice and before making any changes to your treatment plan.

Frequently Asked Questions

What is Olmesartan used for?

Olmesartan is used to treat high blood pressure and reduce the risk of cardiovascular events such as strokes and heart attacks.

How long does it take for Olmesartan to work?

Olmesartan may take a few weeks to show its full effects on blood pressure. It’s important to continue taking it as prescribed.

Can I stop taking Olmesartan if I feel better?

You should not stop taking Olmesartan without consulting your doctor, even if you feel well, as it helps manage your blood pressure.

Are there any dietary restrictions while taking Olmesartan?

It’s advisable to maintain a balanced diet and limit salt intake to support blood pressure control. Discuss any specific dietary concerns with your doctor.

Can Olmesartan be taken with other medications?

Olmesartan can interact with certain medications. Always inform your doctor of all medications you are taking to ensure safe use.