Losartan, an Angiotensin Receptor Blocker


The drug is prescribed to treat Hypertension (high blood pressure). In addition, it helps to prevent heart attacks, strokes, heart failures and kidney complications associated with type 2 diabetes.

IUPAC Name: [2-butyl-5-chloro-3-[[4-[2-(2H-tetrazol-5-yl) phenyl] phenyl] methyl] imidazol-4-yl] methanol

Drug Class: Angiotensin Receptor Blocker

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Route of administration: Oral 

This is not a prescribed drug and not an OTC Drug

Drug Action Mechanism 

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

Side Effects

Losartan side effects include dizziness, exhaustion, back pain, cramps in muscles, coughing, lightheadedness, fainting, chest pain and elevated potassium levels.


 Avoid using this medication, if the person is pregnant. Consult a doctor if the person becomes pregnant while taking this medication since it might cause damage or even death to the developing fetus.


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

  • If the person is allergic to the drug or other angiotensin receptor blockers, or if the person has other allergies.
  • If the person is taking any prescribed, non-prescribed or any medication. 
  • If the person is suffering from any cardiac disease, hepatic disease, renal disease, dehydration, or a high blood potassium level,
  • There might be an increase in potassium levels by using this medication. Avoid potassium-rich substitutes. 
  •  Avoid using this medication with aliskiren (a direct renin inhibitor) if the person is diabetic.
  • If the person has 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 person must be aware that dehydration, vomiting, excessive perspiration and diarrhoea can lower blood pressure which leads to dizziness.
  • Consult a doctor if the person is pregnant or breastfeeding. 

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