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EC-Naprosyn

Generic name: naproxen

Brand names: Aleve, Aleve Back and Muscle Pain, Aleve Easy Open Arthritis, Aleve Liquid Gels, Anaprox-DS, EC-Naprosyn, Naprelan, Naprosyn, Midol Extended Relief, Naprelan 500

Last updated November 2, 2026 0 views
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What is EC-Naprosyn?

EC-Naprosyn is a nonsteroidal anti-inflammatory drug (NSAID).

EC-Naprosyn is used to treat pain or inflammation from conditions like arthritis, ankylosing spondylitis, tendinitis, bursitis, gout, or menstrual cramps.

The delayed-release or extended-release tablets are slower-acting forms of naproxen that are used only for treating chronic conditions like arthritis or ankylosing spondylitis. These forms of naproxen will not work fast enough to treat sudden pain.

EC-Naprosyn may also be used for reasons not mentioned in this medication guide.

This section was rewritten for readability and reviewed for meaning.

How should I take EC-Naprosyn?

Use exactly as directed on the label, or as prescribed by your doctor. Use the lowest dose that effectively treats your condition.

Shake the oral suspension (liquid) before measuring a dose. Measure a dose with the supplied measuring device (not a kitchen spoon).

Take EC-Naprosyn with food or milk if it upsets your stomach.

Always follow the instructions on the medicine label for giving this medicine to a child. EC-Naprosyn doses for children are based on their weight. Your child's dose may change if they gain or lose weight.

If you use EC-Naprosyn for a long time, you may need frequent medical tests.

This medicine can affect the results of certain medical tests. Inform any doctor who treats you that you are using EC-Naprosyn.

Store at room temperature, away from moisture, heat, and light. Keep the bottle tightly closed when not in use.

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Warnings

EC-Naprosyn can raise your chances of having a fatal heart attack or stroke. Do not use EC-Naprosyn right before or after heart bypass surgery (coronary artery bypass graft, or CABG). This medicine may also lead to stomach or intestinal bleeding, which can be fatal.

This section was rewritten for readability and reviewed for meaning.

Before taking this medicine

EC-Naprosyn can raise your chances of having a fatal heart attack or stroke, even if you do not have any risk factors. Do not use this medicine right before or after heart bypass surgery (coronary artery bypass graft, or CABG).

EC-Naprosyn may also lead to stomach or intestinal bleeding, which can be deadly. These issues can happen suddenly while you are taking this medicine, especially in older adults.

You should not use EC-Naprosyn if you are allergic to it, or if you have ever had an asthma attack or a severe allergic reaction after taking aspirin or an NSAID.

Talk to a doctor before giving EC-Naprosyn to a child younger than 12 years old.

Check with a doctor or pharmacist if this medicine is safe for you to use if you have:

  • heart disease, high blood pressure, high cholesterol, diabetes, or if you smoke;
  • a history of heart attack, stroke, or blood clot;
  • stomach ulcers or bleeding;
  • asthma;
  • liver or kidney disease;
  • fluid retention; or
  • if you take aspirin to prevent heart attack or stroke.

If you are pregnant, you should not take EC-Naprosyn unless your doctor advises you to. Taking an NSAID during the last 20 weeks of pregnancy can cause serious heart or kidney issues in the unborn baby and possible complications with your pregnancy.

It may not be safe to breastfeed while using this medicine. Ask your doctor about any risks.

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EC-Naprosyn side effects

Get emergency medical help if you have signs of an allergic reaction (runny or stuffy nose, wheezing or trouble breathing, hives, swelling in your face or throat) or a severe skin reaction (fever, sore throat, burning eyes, skin pain, red or purple skin rash with blistering and peeling).

Stop using EC-Naprosyn and seek medical treatment if you have a serious drug reaction that can affect many parts of your body. Symptoms may include skin rash, fever, swollen glands, muscle aches, severe weakness, unusual bruising, or yellowing of your skin or eyes.

Get emergency medical help if you have signs of a heart attack or stroke: chest pain spreading to your jaw or shoulder, sudden numbness or weakness on one side of the body, slurred speech, leg swelling, feeling short of breath.

EC-Naprosyn may cause serious side effects. Stop using EC-Naprosyn and call your doctor at once if you have:

  • shortness of breath (even with mild exertion);
  • swelling or rapid weight gain;
  • the first sign of any skin rash or blister, no matter how mild;
  • signs of stomach bleeding--bloody or tarry stools, coughing up blood or vomit that looks like coffee grounds;
  • liver problems--nausea, upper stomach pain, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes);
  • kidney problems--little or no urination, painful urination, swelling in your feet or ankles; or
  • low red blood cells (anemia)--pale skin, unusual tiredness, feeling light-headed or short of breath, cold hands and feet.

Common side effects of EC-Naprosyn may include:

  • headache;
  • indigestion, heartburn, stomach pain; or
  • flu symptoms;

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

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What happens if I miss a dose?

Since EC-Naprosyn is taken as needed, you might not have a regular dosing schedule. If you miss a dose and it's almost time for your next dose, just skip the missed dose. Do not take two doses at the same time.

This section was rewritten for readability and reviewed for meaning.

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

Avoid drinking alcohol. It may increase your risk of stomach bleeding.

Avoid taking aspirin or other NSAIDs unless your doctor tells you to.

Ask a doctor or pharmacist before using other medicines for pain, fever, swelling, or cold/flu symptoms. They may contain ingredients similar to EC-Naprosyn (such as aspirin, ibuprofen, or ketoprofen).

Ask your doctor before using an antacid, and use only the type your doctor recommends. Some antacids can make it harder for your body to absorb EC-Naprosyn.

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What other drugs will affect EC-Naprosyn?

Ask your doctor before using EC-Naprosyn if you take an antidepressant. Taking certain antidepressants with an NSAID may cause you to bruise or bleed easily.

Ask a doctor or pharmacist before using EC-Naprosyn with any other medications, especially:

  • other NSAIDs or salicylates (diflunisal, salsalate);
  • antacids and sucralfate;
  • cholestyramine;
  • cyclosporine;
  • digoxin;
  • lithium;
  • methotrexate;
  • pemetrexed;
  • probenecid;
  • warfarin (Coumadin, Jantoven) or similar blood thinners;
  • a diuretic or "water pill"; or
  • heart or blood pressure medication.

This list is not complete. Other drugs may affect EC-Naprosyn, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.

This section was rewritten for readability and reviewed for meaning.

Common questions about EC-Naprosyn

Naproxen vs ibuprofen: What's the difference?
Ibuprofen is short acting, while naproxen is long acting and more likely to cause an upset stomach. Naproxen also increases the risk of uncontrolled bleeding in people taking blood thinners by 4-fold, and ibuprofen increases the risk 2-fold. Naproxen and ibuprofen are both NSAIDs so they are similar in many ways, but there are important differences. Continue reading
Can you take naproxen and Tylenol together safely?
Yes, naproxen and acetaminophen (Tylenol) can be taken together safely for most healthy adults when used as directed, as they work differently to alleviate pain and have minimal direct interaction with each other. Continue reading
What cold medicine can you take with diabetes?
If you have diabetes and you catch a cold or flu, there are over-the-counter (OTC) medicines that are safe for you to take to help alleviate your symptoms. Check out our suggestions for pain and fever relievers, cough and congestion medications and more. Remember to look for cold and flu medicines that are less likely to affect your blood sugar (glucose) levels, including sugar-free and alcohol-free options, or worsen any diabetes complications you may have. Continue reading
What is Caridoxen used for?
Caridoxen is a brand name of a combination medicine available in Mexico that contains naproxen (250mg) and carisoprodol (200mg) which may be used to control pain and inflammation and relieve muscle spasms. Caridoxen may be used as a muscle relaxant. Continue reading
Can you Double up on Pain Meds? Safe Painkiller Combinations
Many people wonder if they can combine over-the-counter (OTC) pain medications like taking naproxen and ibuprofen together, or doubling up on painkillers for better pain relief. The answer depends on which specific pain medications you're combining and proper timing between doses. There are four main types of oral analgesics that are available without a prescription: naproxen (brand name Aleve), ibuprofen (brand names Advil and Motrin), aspirin, and acetaminophen (brand name Tylenol). Continue reading
How long does naproxen stay in your system?
It should be out of your system within approx 93.5 hours. Naproxen has an elimination half life of 12 to 17 hours. This is the time it takes for your body to reduce plasma drug levels by half. It takes approximately 5.5 x elimination half-life for a drug to be eliminated from your system. Continue reading
What is Apronax called in the USA?
In the U.S., Apronax is called naproxen sodium (brand example: Aleve). Naproxen is a common over-the-counter NSAID medicine used to treat pain, fever, and headache. Apronax is the Latin American brand name for the same medicine. Continue reading
Does Feverfew interact with any drugs?
Feverfew, an herbal supplement that is a member of the daisy family, may interact with over 40 medicines. This includes drugs used to help prevent blood clots like the anticoagulant warfarin. Continue reading

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Before you take this medicine: the information on this page is general and may not cover your personal circumstances. Read the label supplied with your medicine and ask a pharmacist or doctor if you are unsure, especially if you are pregnant, breastfeeding, taking other medicines or managing a long-term condition.
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