Cozaar is an angiotensin II receptor antagonist drug. The active ingredient in Cozaar is losartan potassium which is dispensed as oral tablets (25mg, 50mg and 100mg).
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Cozaar (Losartan)

Losartan (Cozaar) is placed under the class of medicines called angiotensin II receptor antagonists. It prevents the blood vessels from narrowing, due to which blood pressure is reduced and blood circulation is improved.

How to use

Use this drug by mouth as advised by your physician or doctor, generally once every day with/without meal. The dosage is according to your response to medicine and medical condition.


Cozaar is used for the treatment of high blood pressure (hypertension). Also, it is utilized to reduce the potential risk of stroke in some people having heart disorder. Cozaar is used to decrease the long-term damage in kidney in those people who suffer from type 2 diabetes and also have high BP. Reducing the high blood pressure helps to prevent heart attacks, strokes and kidney disorders.

Side Effects

Avail immediate medical aid if you show any of these signs of hypersensitivity: hives; swollen lips, throat, tongue or face, difficult breathing.

In rare chances, cozaar can lead to a condition in which the skeletal muscle tissue breaks down, resulting in kidney failure. Inform your doctor at once if you have undiagnosed muscle pain, weakness or tenderness especially if you feel unusual tiredness, have dark colored urine and fever.

Consult your physician immediately if you have:

  • Fatigue
  • Burning or paining sensation while you urinate;
  • Light-headedness
  • Shortness of breath,
  • Trouble in concentration
  • Rapid heart rate
  • Mood swings
  • Wheezing,
  • Drowsiness
  • Chest pain;
  • Loss of appetite
  • Confusion,
  • Nausea
  • Increased thirst,
  • Vomiting;
  • Swelling,
  • Less or no urination
  • Weight gain,
  • High levels of potassium (weak pulse, slow heart rate, tingly feeling, muscle weakness).
Cozaar (Losartan) 100mg tablets

Some of the common side effects are given below:

  • Symptoms of cold/flu like sneezing, stuffy nose, fever, sore throat,
  • Dry cough;
  • Pain in back or legs
  • Muscle cramps;
  • Stomach pain,
  • Headache
  • Diarrhea;
  • Dizziness;
  • Sleep problems
  • Tired feeling
  • Drowsiness


Don’t use cozaar if you are hypersensitive to it.

If you are suffering from diabetes, avoid the use of cozaar along with any medicine that consists of aliskiren (Tekturna, Amturnide, Valturna, Tekamlo). Also you should avoid taking this drug with aliskiren in case you are suffering from a kidney disorder.

To ensure that losartan is safe for use, let your doctor know if you have:

  • Liver disorder
  • Kidney disease;
  • Congestive heart failure;
  • Dehydration
  • An electrolyte imbalance (for example- low potassium levels in the body).

Pregnancy and Cozaar

Avoid the use of cozaar if you are pregnant. Stop consuming and inform your physician at once if you get pregnant. Losartan can cause damage or even death to the fetus if you consume the drug during your 2nd or 3rd trimester of pregnancy. Use efficient birth control.

It is not certain whether cozaar goes into maternal milk or causes any harm to a nursing baby. Don’t breast feed if you are using cozaar.

Drug Uses

Cozaar is prescribed for the treatment of hypertension. The active ingredient in Cozaar works by keeping blood vessels dilated, thereby lowering blood pressure while helping the kidneys to rid the body of excess fluid.

Cozaar is used to treat other medical conditions not listed in this information guide.


Cozaar must always be used as directed. Do not make adjustments to the dose before speaking to a doctor. Cozaar does not have to be taken with food.

It may take between 3-6 weeks of treatment with Cozaar before there is an improvement in the condition. Patients using Cozaar should have regular blood tests.

Do not suddenly stop taking Cozaar unless instructed by your doctor. High blood pressure often has no obvious symptoms.

Missed Dose

If a dose is missed, it may be taken when you remember. Ignore the dose if it is nearly time to take the next scheduled dose. Never double-up on a dose.

Warnings and Precautions

Avoid the use of Cozaar if you are allergic to losartan.

Avoid the use of alcohol during treatment with Cozaar. When used with Cozaar, alcohol can intensify some of the drug’s side-effects.

Unless otherwise advised by your doctor, avoid using salt substitutes and potassium supplements while using Cozaar.

Tell your doctor if you suffer with any of the following: heart failure, liver or kidney disease, or dehydration.

Cozaar can harm an unborn fetus especially if this drug is taken during the second and third trimesters of gestation. If you fall pregnant while using Cozaar, notify your doctor immediately. During treatment with Cozaar women should use an effective contraceptive.

It is unknown if Cozaar is released into breast milk, therefore women who are nursing should use this drug with caution, under the directions of a doctor.

Before using Cozaar, you must give your doctor full details of your medical history and other medications that you use. These include herbal medicines and vitamin supplements. Cozaar can react badly with some medications.

Possible Side-effects

Call for emergency assistance if any of the following symptoms of allergy occur: difficulty in breathing, hives, or swelling of the lips, tongue, throat or face.

Contact your doctor if any of the following side-effects occur: vomiting or nausea, dark urine, tenderness, muscle pain, fever, difficult or painful urination, numbness or tingling, fainting, chest pain, swelling of the hands or feet, easy bleeding or bruising, low heart rate, or weak pulse.

Common side-effects can include sore throat, blocked or runny nose, muscle pain, stomach pain, back pain, leg pain, sore throat, headache, diarrhea, fatigue, or insomnia.

Contact your doctor if any uncomfortable symptoms occur, or persist.


If overdose is suspected, call for emergency assistance immediately. Symptoms of overdose with Cozaar can include fainting, slow or fast heartbeat, or dizziness.

Storage instructions

Cozaar must be kept away from children and stored in a dry, cool place away from sunlight and moisture.