Naproxen 500 mg – Effects, Dosage & Side Effects
Naproxen 500 is a prescription-strength pain reliever from the NSAID group, used to treat pain, inflammation, and fever in adults.
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Naproxen 500 is a prescription-strength pain reliever from the NSAID group, used to treat pain, inflammation, and fever in adults.
What is Naproxen 500?
Naproxen 500 refers to a dosage form of the active ingredient naproxen containing 500 milligrams per tablet or capsule. Naproxen belongs to the class of nonsteroidal anti-inflammatory drugs (NSAIDs) and is widely used to relieve pain, reduce inflammation, and lower fever. At this dosage, naproxen is typically available by prescription only.
Indications
Naproxen 500 is indicated for a variety of conditions, including:
- Joint pain associated with rheumatoid arthritis and osteoarthritis
- Back pain and muscle tension
- Menstrual pain (dysmenorrhea)
- Headaches and migraine
- Sports injuries and sprains
- Acute gout attacks
- Fever
Mechanism of Action
Naproxen works by inhibiting the enzyme cyclooxygenase (COX-1 and COX-2). These enzymes are responsible for the production of prostaglandins -- chemical messengers that promote pain, inflammation, and fever in the body. By blocking prostaglandin synthesis, naproxen effectively reduces pain, lowers inflammation, and brings down fever. The effect typically begins within 30 to 60 minutes and lasts approximately 8 to 12 hours, making naproxen longer-acting than many other NSAIDs such as ibuprofen.
Dosage and Administration
The standard adult dose is 500 mg naproxen twice daily, taken approximately every 8 to 12 hours. The maximum recommended daily dose is generally 1,000 mg, unless otherwise directed by a physician. Tablets should be swallowed with a full glass of water and preferably taken with food or milk to reduce the risk of stomach irritation.
- Do not use for longer than recommended
- Always use the lowest effective dose
- Consult a doctor if symptoms persist or worsen
Side Effects
Like all NSAIDs, naproxen 500 may cause side effects. Common side effects include:
- Gastrointestinal complaints: nausea, stomach upset, heartburn, diarrhea, or constipation
- Peptic ulcers and gastrointestinal bleeding with prolonged use
- Headache and dizziness
- Fluid retention (edema)
- Increased blood pressure
- Kidney function impairment with long-term use
- Rarely: allergic reactions, skin rash
To protect the stomach lining during prolonged use, doctors often prescribe a proton pump inhibitor (e.g., omeprazole) alongside naproxen.
Contraindications and Warnings
Naproxen 500 should not be taken in the following situations:
- Known hypersensitivity to naproxen or other NSAIDs
- Active peptic ulcers or gastrointestinal bleeding
- Severe renal or hepatic impairment
- Severe heart failure
- From the 6th month of pregnancy onwards (contraindicated)
- Concurrent use of anticoagulants without medical supervision
Naproxen 500 mg should only be used in children and adolescents under 18 years of age under medical supervision.
Drug Interactions
Naproxen may interact with various other medications:
- Anticoagulants (e.g., warfarin, aspirin): increased risk of bleeding
- ACE inhibitors and diuretics: reduced antihypertensive effect
- Lithium and methotrexate: elevated plasma levels of these drugs
- Corticosteroids: increased risk of gastrointestinal bleeding
References
- European Medicines Agency (EMA) - Summary of Product Characteristics for Naproxen, current edition.
- U.S. Food and Drug Administration (FDA) - Drug Label Information: Naproxen Sodium 500 mg (2023).
- Patrono C. & Baigent C. - Nonsteroidal anti-inflammatory drugs and the heart, Circulation, 2014.
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