Olmesartan is used to treat high blood pressure (hypertension). This medication relaxes and expands the blood vessels thereby lowering the blood pressure levels, which helps prevent heart attacks, strokes, and kidney problems. Olmesartan works by blocking the action of a hormone called angiotensin II. This medicine may also be used to treat other conditions as determined by your doctor.

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What does Olmesartan treat?

Olmesartan is a medication prescribed to treat high blood pressure (hypertension). This acts by blocking the action of a hormone called angiotensin II. This helps the blood vessels to relax and expand which eases blood flow. This brings down the risk of heart attacks, strokes and kidney problems. Your physician may use this to treat other ailments based on their discretion.

Possible Side Effects

Olmesartan might have some side effects but it’s not possible to anticipate them. It does not have any major side effects and the minor ones that may occur are temporary. In rare cases, there might be major side effects and immediate medical attention must be sought.

Side effects may include headache, weakness, rash, dizziness, joint pain, itching, stomach pain, diarrhea, and upper respiratory infection. This is not the complete list though.

In case, there is a change in intensity of side effects or if any new side effects develop, make sure you consult your doctor.

Dosage Instructions

Follow the Olmesartan dosage prescribed by your physician. The dosage could vary based on individual patient requirements. Always follow your physician’s instructions or go by the directions on the prescription drug label. Make sure you have it with a whole glass of water.


Missed a dose?

Take it immediately once you remember. In case, this time falls close to the next dosage, skip it and get back to the prescribed schedule. Never take a double dose unless your physician specifically directs you to do so.


Don’t waste any time and seek immediate medical attention. Overdose symptoms that you may encounter are fainting, dizziness and fast or slow heartbeat.

Drug Interactions

Drug interactions must be considered before starting to take any kind of drug. Drug interactions might happen either when Olmesartan is taken along with another drug or with particular foods. To prevent any kind of negative interaction, make sure you inform your doctor of any drugs you are taking including non-prescription medication, OTCs, health supplements like vitamins, minerals, herbal medicine, drinks with caffeine and alcohol, illegal drugs, smoking habits and so on which may increase the effect of Olmesartan.

It may interact with:


  • Furosemide
  • Hydrochlorothiazide
  • Lithium
  • Torsemide


It may also interact with diuretics, potassium supplements, potassium-sparing diuretics, cough-and-cold medications besides nonsteroidal anti-inflammatory drugs. This is not an exhaustive list though.

Appraise your doctor of any medical conditions that you are suffering from and your family history of medical ailments. It’s important that you do not stop or start taking any medicine without the consent of your physician.

What to ask your doctor before you start on Olmesartan


  • Can I take Olmesartan along with other drugs? 
  • Are there certain foods, beverages and products to be avoided while on Olmesartan? 
  • What is the dosage of Olmesartan to be consumed? 
  • How should I use Olmesartan? 
  • How will Olmesartan work on my body? 
  • How can the drug interactions and side effects of Olmesartan be minimized or completely avoided?



The health and medical information that we have provided are meant to supplement and not substitute the advice of your physician, pharmacists or other health care professionals. This does not suggest that usage of Olmesartan is safe, appropriate or effective for you. Always ensure that you take this or any other drug only after consulting your physician.