Losartan Side Effects

Losartan (Cozaar) belongs to a group of drugs called angiotensin II receptor antagonists. It keeps blood vessels from narrowing, which lowers blood pressure and improves blood flow.

Losartan is used to treat high blood pressure (hypertension). It is also used to lower the risk of stroke in certain people with heart disease.

Losartan is used to slow long-term kidney damage in people with type 2 diabetes who also have high blood pressure.

Do not use losartan if you are pregnant. It could harm the unborn baby. Stop using this medication and tell your doctor right away if you become pregnant during treatment.

You should not use this medication if you are allergic to losartan.

Drinking alcohol can further lower your blood pressure and may increase certain side effects of losartan.

Do not use potassium supplements or salt substitutes while you are taking losartan, unless your doctor has told you to.

Your blood pressure will need to be checked often. Visit your doctor regularly.

Keep using losartan even if you feel fine. High blood pressure often has no symptoms.

In rare cases, losartan can cause a condition that results in the breakdown of skeletal muscle tissue, leading to kidney failure. Call your doctor right away if you have muscle pain, tenderness, or weakness especially if you also have fever, nausea or vomiting, and dark colored urine.

Get emergency medical help if you have any of these signs of an allergic reaction to losartan: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

In rare cases, losartan can cause a condition that results in the breakdown of skeletal muscle tissue, leading to kidney failure. Call your doctor right away if you have muscle pain, tenderness, or weakness especially if you also have fever, nausea or vomiting, and dark colored urine.

Call your doctor at once if you have a serious side effect such as:

  • feeling like you might pass out;
  • pain or burning when you urinate;
  • pale skin, feeling light-headed or short of breath, rapid heart rate, trouble concentrating;
  • wheezing, chest pain;
  • drowsiness, confusion, mood changes, increased thirst, loss of appetite, nausea and vomiting;
  • swelling, weight gain, feeling short of breath, urinating less than usual or not at all; or
  • high potassium (slow heart rate, weak pulse, muscle weakness, tingly feeling).

Less serious losartan side effects may include:

  • cold or flu symptoms such as stuffy nose, sneezing, sore throat, fever;
  • dry cough;
  • muscle cramps;
  • pain in your legs or back;
  • stomach pain, diarrhea;
  • headache, dizziness;
  • tired feeling; or
  • sleep problems (insomnia).

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.

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