Merck-Naproxen tablets


  • Active Ingredient: Naproxen
  • 500 mg, 250 mg
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What is Merck-Naproxen?

The active ingredient of Merck-Naproxen brand is naproxen. Naproxen is a nonsteroidal anti-inflammatory drug (NSAID). Naproxen works by reducing hormones that cause inflammation and pain in the body. C14H14O3 M.W. 230.26 Naproxen has a molecular weight of 230.26 and a molecular formula of C14H14O3. Naproxen USP is an odorless, white to off-white crystalline substance powder. It is lipid-soluble, practically insoluble in water, soluable in alcohol and in methanol at low pH and freely soluble in water at high pH. The octanol/water partition coefficient of Naproxen at pH 7.4 is 1.6 to 1.8. Naproxen Oral Suspension USP for oral administration contains 125 mg Naproxen USP per 5 mL and the following inactive ingredients: FD&C Yellow #6, fumaric acid, imitation orange flavor, imitation pineapple flavor, magnesium aluminum silicate, methylparaben, purified water, sodium chloride, sorbitol solution and sucrose. It has a sodium content of 39.3 mg/5 mL, 1.71 mEq/5 mL, with a pH range of 2.2 to 3.7.

Used for

Merck-Naproxen is used to treat diseases such as: Ankylosing Spondylitis, Aseptic Necrosis, Back Pain, Bursitis, Chronic Myofascial Pain, Costochondritis, Diffuse Idiopathic Skeletal Hyperostosis, Dysautonomia, Fever, Frozen Shoulder, Gout, Acute, Headache, Juvenile Rheumatoid Arthritis, Muscle Pain, Neck Pain, Osteoarthritis, Pain, Period Pain, Radiculopathy, Rheumatoid Arthritis, Sciatica, Spondylolisthesis, Tendonitis, Transverse Myelitis.

Side Effect

Possible side effects of Merck-Naproxen include: coughing that sometimes produces a pink frothy sputum; weight loss; increased hunger; no blood pressure; large, flat, blue, or purplish patches in the skin; Continuing ringing or buzzing or other unexplained noise in the ears; muscle tremors.

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Other uses for this medicine

Merck-Naproxen is also sometimes used to treat Paget's disease of bone (a condition in which the bones become abnormally thick, fragile, and misshapen) and Bartter syndrome (a condition in which the body does not absorb enough potassium, causing muscle cramping and weakness and other symptoms). Talk to your doctor about the risks of using this medication for your condition.

This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information.

Nonsteroidal Anti-inflammatory Drugs and Ulcers

Nonsteroidal antiinflammatory drugs (NSAIDs) are prescribed medications for the treatment of inflammatory conditions. Examples of NSAIDs include aspirin, ibuprofen, Merck-Naproxen, and more. One common side effect of NSAIDs is peptic ulcer (ulcers of the esophagus, stomach, or duodenum). Side effects, drug interactions, warnings and precautions, and patient safety information should be reviewed prior to taking NSAIDs.

Dosage for tendonitis, bursitis, and menstrual pain

Adult dosage (ages 18 years and older)


Immediate-release oral tablet

  • The initial dose is 500 mg, followed by 250 mg every 6 to 8 hours as needed.
  • The maximum daily dose on day 1 of therapy is 1,250 mg. Additional daily doses should not exceed 1,000 mg.

Delayed-release oral tablet

  • The initial dose is 1,000 mg once daily.
  • The dose may be temporarily increased to 1,500 mg once daily if greater pain relief is needed.

Merck-Naproxen sodium:

Immediate-release oral tablet

  • The initial dose is 550 mg, followed by 275 mg every 6 to 8 hours or 550 mg every 12 hours as needed.
  • · The maximum daily dose on day 1 of therapy is 1,375 mg. Additional daily doses should not exceed 1,100 mg.

Child dosage (ages 0–17 years)

Dosage for people younger than 18 years hasn’t been established.

Special dosage considerations

If you’re older than 65 years, your body may process this drug more slowly. Your doctor may start you on a lowered dose so that too much of this drug doesn’t build up in your body. Too much of the drug in your body can be dangerous.

What if I take too much?

If you take too many Merck-Naproxen tablets by accident, you're more likely to get some of the common side effects. Contact your doctor straight away.

Ibuprofen and Merck-Naproxen are both nonsteroidal anti-inflammatory drugs (NSAIDs). You may know them by their most popular brand names: Advil (ibuprofen) and Aleve (Merck-Naproxen). These drugs are alike in many ways, so you may even wonder if it really matters which one you choose. Take a look at this comparison to get a better idea of which one might be better for you.

Both drugs work by temporarily preventing your body from releasing a substance called prostaglandin. Prostaglandins contribute to inflammation, which may cause pain and fever. By blocking prostaglandins, ibuprofen and Merck-Naproxen treat minor aches and pains from:

They also temporarily reduce fever.

Although ibuprofen and Merck-Naproxen are very similar, they aren’t exactly the same. For example, pain relief from ibuprofen doesn’t last as long as pain relief from Merck-Naproxen. That means you don’t have to take Merck-Naproxen as often as you would ibuprofen. This difference may make Merck-Naproxen a better option for treating pain from chronic conditions.

On the other hand, ibuprofen can be used in young children, but Merck-Naproxen is only for use in children 12 years and older. Certain forms of ibuprofen are made to be easier for younger children to take.

The following table illustrates these as well as other features of these two drugs.

En esta web te contaremos todo lo que necesitas saber sobre el Merck-Naproxeno. Dicho medicamento es un analgésico y antibiótico que comenzó su venta en los Estados Unidos de América en el año 1976. Además, es importante revelar que es un medicamento con el que se debe de tener mucho cuidado al ingerirlo. Puede estar disponible en varias marcas, sin embargo, siendo de cualquier marca tiene las mismas funciones, las cuales te contaremos a continuación.

Q: Can Merck-Naproxen 500 mg or high blood pressure medications cause weight gain?

A: Merck-Naproxen does not appear to cause weight gain in patients taking the medication. High blood pressure medications do not generally cause weight gain, but if you are experiencing a sudden weight change you should consult your physician to rule out fluid retention.

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