Evidence update: The drug-label and public-health sources linked in this guide were checked on August 8, 2026. This is general education, not an individual diagnosis or prescription.
Naproxen sodium can relieve pain and inflammation, but it is not a diagnosis and its benefits cannot be separated from NSAID class risks.
What kind of medicine is it?
Naproxen is a nonsteroidal anti-inflammatory drug (NSAID). Naproxen sodium is a salt form that supplies naproxen after absorption. It reduces prostaglandin production, which can lower pain, fever, and inflammation; the same pathway helps explain effects on the stomach lining, kidney blood flow, blood pressure, platelets, and fluid balance.
What it is used for
Nonprescription naproxen is labeled for temporary relief of minor aches and pains such as headache, muscle ache, arthritis pain, menstrual pain, toothache, backache, and common-cold discomfort, and for reducing fever. Prescription products are used for conditions including osteoarthritis, rheumatoid arthritis, ankylosing spondylitis, juvenile idiopathic arthritis, tendinitis, bursitis, acute gout, pain, and primary dysmenorrhea.
What pain relief cannot tell you
Improvement after a dose does not establish a diagnosis. Naproxen does not treat a dental infection, repair an injury, remove a blood clot, reverse nerve compression, or explain recurrent pain. Redness, major swelling, fever, weakness, numbness, chest symptoms, severe abdominal pain, or pain that repeatedly returns can change the priority from symptom relief to assessment.
Why the formulation matters
- OTC naproxen sodium commonly appears as 220 mg caplets with a consumer Drug Facts panel.
- Prescription naproxen sodium commonly includes 275 mg and 550 mg immediate-release tablets.
- Naproxen products also include other strengths, liquids, delayed-release, and extended-release formulations.
- Different forms are not automatically interchangeable even when the active drug is related.
Major safety boundaries
The prescription boxed warning covers serious cardiovascular thrombotic events and gastrointestinal bleeding, ulceration, and perforation. Other important concerns include kidney injury and high potassium, hypertension, heart failure and edema, liver injury, anaphylaxis, aspirin-sensitive asthma, serious skin reactions, fetal toxicity, and blood-count changes.
How to use this information
Start with the exact package or prescription. Define the treatment goal and duration, screen personal history and current medicines, and know which symptom ends self-care. For ongoing treatment, ask who will monitor blood pressure, kidney function, blood counts, or other relevant findings.
Common questions
Is naproxen a narcotic or opioid?
No. Naproxen is an NSAID. It does not share the opioid mechanism, but it has its own serious gastrointestinal, cardiovascular, kidney, allergy, and pregnancy risks.
Does naproxen cure inflammation?
It can reduce inflammatory symptoms while present in the body; it does not necessarily treat the underlying cause of recurrent or unexplained inflammation.
Why are naproxen and naproxen sodium strengths different?
The sodium salt adds weight and is absorbed more rapidly. Compare complete product names and formulations rather than milligrams alone.
Related guides on this site
- Naproxen Sodium Side Effects: Triage by Symptom
- What OTC Naproxen Evidence Can—and Cannot—Tell Patients
- Naproxen Sodium and People With Liver Disease: Medication Review Questions
Primary sources and scope
The links below are the evidence base for the label statements in this article. Product labels can change, so the package or dispensing label in hand remains the controlling instruction.
- Naproxen drug information — MedlinePlus
- Prescription naproxen sodium label — DailyMed
- Naproxen sodium 220 mg Drug Facts — DailyMed
Urgent boundary: call local emergency services for chest pressure, severe breathing difficulty, one-sided weakness, fainting, vomiting blood, black tar-like stool, or rapidly progressing facial or throat swelling. In the United States, a possible overdose can also be discussed with Poison Control at 1-800-222-1222.