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Losartan Potassium

Generic Cozaar

Losartan (Cozaar) is an inexpensive drug used to treat high blood pressure and reduce the risk of stroke, and to slow the progression of kidney disease in patients with diabetes. It is more popular than comparable drugs. It is available in generic and brand versions. Generic losartan is covered by most Medicare and insurance plans, but some pharmacy coupons or cash prices may be lower. The lowest USARx price for the most common version of losartan is around $3.00, 92% off the average retail price of $37.87.

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Losartan Potassium Side Effects

What should I watch for?

Visit your doctor or health care professional for regular checks on your progress. Check your blood pressure as directed. Ask your doctor or health care professional what your blood pressure should be and when you should contact him or her. Call your doctor or health care professional if you notice an irregular or fast heart beat.

Women should inform their doctor if they wish to become pregnant or think they might be pregnant. There is a potential for serious side effects to an unborn child, particularly in the second or third trimester. Talk to your health care professional or pharmacist for more information.

You may get drowsy or dizzy. Do not drive, use machinery, or do anything that needs mental alertness until you know how this drug affects you. Do not stand or sit up quickly, especially if you are an older patient. This reduces the risk of dizzy or fainting spells. Alcohol can make you more drowsy and dizzy. Avoid alcoholic drinks.

Avoid salt substitutes unless you are told otherwise by your doctor or health care professional.

Do not treat yourself for coughs, colds, or pain while you are taking this medicine without asking your doctor or health care professional for advice. Some ingredients may increase your blood pressure.

Common and Rare Side Effects

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur:

Less common

Blurred vision

Burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings


Difficult breathing


Dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position


Fast or irregular heartbeat

Nausea or vomiting


Numbness or tingling in the hands, feet, or lips

Stomach pain


Unusual tiredness or weakness

Weakness or heaviness of the legs

Incidence not known

Black, tarry stools

Bleeding gums

Blood in the urine or stools




Decreased urine output

Difficulty swallowing


Hives, itching, skin rash

Increased thirst

Large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs

Muscle pain or cramps

Pinpoint red spots on the skin

Puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue

Tightness in the chest

Unusual bleeding or bruising

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

Less common

Body aches or pain


Continuing ringing or buzzing or other unexplained noise in the ears

Decreased interest in sexual intercourse

Difficulty having a bowel movement (stool)

Ear congestion

Feeling of constant movement of self or surroundings

Feeling sad or empty

Headache, severe and throbbing

Hearing loss

Inability to have or keep an erection

Increased sensitivity of the skin to sunlight


Lack of appetite

Loss in sexual ability, desire, drive, or performance

Loss of interest or pleasure

Loss of voice

Redness or other discoloration of the skin

Sensation of spinning

Severe sunburn


Sore throat

Stuffy or runny nose

Trouble concentrating

Trouble sleeping

Incidence not known

Change or loss of taste

Dark urine

General tiredness and weakness

Light-colored stools

Yellow eyes and skin

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.