naproxen sodium 550 mg

Naproxen Sodium 550 mg: Prescription Uses and Safety Boundaries

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.

A 550 mg tablet belongs to a prescription plan; the dispensing label and clinical indication—not an online conversion—control how it is used.

Why 550 mg is not an OTC instruction

Naproxen sodium 550 mg is a prescription strength. The linked prescribing information describes indication-specific regimens, but the correct amount and interval for one patient must come from that patient’s dispensing label. It should not be reconstructed from 220 mg consumer directions.

Confirm the product identity first

Naproxen and naproxen sodium are related but their milligram strengths are not written the same way. The prescription label lists naproxen sodium 550 mg as corresponding to 500 mg of naproxen plus the sodium component. Immediate-release, delayed-release, extended-release, and liquid products are not automatically interchangeable.

What the prescription label establishes

  • Use the lowest effective dose for the shortest duration consistent with the treatment goal.
  • Do not use multiple naproxen-containing products together.
  • The product is contraindicated around coronary artery bypass graft surgery and in people with certain prior allergic-type reactions to aspirin or other NSAIDs.
  • Cardiovascular events and serious gastrointestinal bleeding can occur early and without a long warning period.
  • Kidney function, blood pressure, fluid retention, blood counts, and liver findings may require monitoring during repeated treatment.

Questions to settle before the first or next dose

  1. Is the bottle naproxen or naproxen sodium, and what formulation is it?
  2. What condition is being treated, and what result should show that treatment is working?
  3. What is the exact interval and stop date on the prescription?
  4. Do aspirin, anticoagulants, steroids, SSRIs/SNRIs, diuretics, ACE inhibitors, ARBs, lithium, or methotrexate change the plan?
  5. Is laboratory or blood-pressure monitoring expected?

When to stop and seek help

Urgent assessment is needed for chest pressure, stroke-like weakness or speech change, vomiting blood, black stool, facial or throat swelling, severe rash, markedly reduced urine, or severe shortness of breath. Contact the prescriber promptly for new edema, rapid weight gain, persistent stomach symptoms, rising blood pressure, or an unexplained decline in function.

Common questions

Is 550 mg simply two and a half OTC tablets?

No. A prescription product must be followed as dispensed. Converting from 220 mg caplets ignores the prescribed formulation, indication, interval, and monitoring plan.

Can a 550 mg tablet be split?

Only follow the pharmacy label and product-specific instructions. A score line does not by itself establish that a particular regimen should use half-tablets.

Why does the label mention the lowest effective dose?

Cardiovascular, gastrointestinal, kidney, blood-pressure, and fluid risks can rise with exposure. Treatment should have a defined benefit and review point.

Related guides on this site

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.

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.