Losartan (Cozaar) Side Effects, Important Info, How to Take

Losartan, also known as Cozaar, is a part of a class of drugs known as angiotensin II receptor antagonists. It is available in the form of tablets and liquid form and is used to cure hypertension. It works by relaxing your blood vessels, which results in lower blood pressure and improved blood flow.


Losartan is also taken by patients with high blood pressure and type 2 diabetes to reduce the risk of strokes and prevent long-term kidney damage. In short, Losartan can be taken to prevent heart attacks, strokes, and kidney problems.


Side effects

Losartan can help cure hypertension and can prevent strokes, but it also has some side effects. Many of these are not severe and disappear as your body adjusts to the use of Losartan. However, seek immediate medical help if any of the minor side effects worsen or do not go away.

Minor side effects

  • Headaches
  • Dizziness
  • Lightheadedness
  • Muscle cramps
  • Diarrhea
  • Tiredness
  • A sore throat, stuffy nose, and sneezing
  • Fever
  • Pain in your back or legs
  • A dry cough
  • Stomach pain
  • Insomnia


However, some of the side effects are severe and can cause death if not treated immediately. Visit your doctor if you experience any of these major side effects.

Major side effects

  • Feeling that you might faint
  • Chest pain or wheezing
  • Mental or mood changes
  • Loss of appetite
  • Pain or burning while urinating
  • Swelling
  • Shortness of breath
  • Pale skin
  • Nausea and vomiting
  • Increased thirst
  • Rapid weight gain
  • Signs of high potassium including muscle weakness and weak pulse
  • Little to no urinating
  • Signs of an allergic reaction including dizziness, itching, trouble breathing, swelling, and rash.

How to use?

Take Losartan only according to the prescribed amount without increasing or decreasing your dose. You can take Losartan with food if you feel nauseous. It is advisable to have one tablet every day unless prescribed otherwise by your doctor. If you are using the liquid medicine, make sure you shake the bottle well. It is advisable to use a dose-measuring device to make sure you get the correct dose. Losartan will not work immediately and has to be taken regularly for at least 3 to 6 weeks to be effective. However, visit your doctor if your condition does not improve after taking Losartan for three weeks. Visit your doctor for regular check-ups so that your blood pressure can be monitored. Do not stop taking Losartan even if you feel well, as you can have high blood pressure even if you do not have any symptoms. Store Losartan in a cool, dry place.



  • Do not take Losartan if you are allergic to any of the active or inactive ingredients found in it. It is advisable to ask for a list of ingredients from your pharmacist to prevent an allergic reaction.
  • Inform your doctor of all the diseases you have had, especially if you have a history of dehydration and liver disease.
  • Inform your doctor and dentist of all the medications you are taking before undergoing any surgery.
  • As one of the side effects of taking Losartan is dizziness, avoid operating machinery or driving a car until you are sure about the way Losartan affects your body. Avoid drinking any alcoholic beverages and using marijuana as they can worsen these side effects.
  • It is not advisable to take potassium supplements while using Losartan as it can lead to high potassium levels.
  • Do not use Losartan if you are pregnant as it can have harmful effects on an unborn baby. Consult your doctor about the use of Losartan if you are pregnant.
  • It is uncertain whether Losartan can pass into breast-milk and have harmful effects on a nursing infant. Consult your doctor about the use of Losartan before breastfeeding.