Olmesartan, Angiotensin II Receptor Blocker


The drug is prescribed to treat Hypertension (high blood pressure). In addition, it helps to prevent heart attacks, strokes and heart failure.

IUPAC Name: 5-(2-hydroxypropan-2-yl)-2-propyl-3-[[4-[2-(2H-tetrazol-5-yl) phenyl] phenyl] methyl] imidazole-4-carboxylic acid

Drug Class: Angiotensin II Receptor Blocker

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Route of Administration: Oral 

This is a prescribed drug and an OTC Drug

Drug Action Mechanism

This medication is an Angiotensin II Receptor Blocker. It works by lowering blood pressure by relaxing and widening of blood vessels (i.e., arteries and veins) and allowing blood flow more smoothly and the heart to pump blood more effectively.    

Side Effects

Valsartan side effects may include dizziness, headache, back pain, nasal congestion, sore throat, tiredness, fainting, elevated potassium levels in the blood.


  • Avoid using this medication, if the person is pregnant. Consult a doctor if the person become pregnant while taking this medication since it might cause damage or even death to the developing fetus.
  • Avoid using this medication with aliskiren (a direct renin inhibitor) if the person is diabetic. 


Before using this medication, follow these precautions and notify a doctor

  • If the person is allergic to the drug or to other angiotensin receptor blockers, or if the person have other allergies,
  • If the person is taking any prescribed, non-prescribed or herbal medications,
  • If the person is suffering from any cardiac disease, hepatic disease, renal disease, dehydration, a high blood potassium levels and if the person is on low sodium diet, 
  • There might be an increase in the potassium levels. Avoid potassium rich substitutes,
  • If the person have undergone any type of surgery i.e., eye or dental surgery, 
  • While taking this medication, limit alcohol usage since it increases the chances of developing blurred vision, dizziness or drowsiness. It may also cause a loss of alertness, 
  • The patient must be aware that dehydration, vomiting, excessive perspiration and diarrhea can lower blood pressure which leads to dizziness.
  • Consult a doctor if the person is pregnant and breastfeeding.

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