Differences Between Naproxen vs. Mefenamic Acid

Last updated: February 8, 2026Reviewed date: February 8, 2026Reading time: 3 min read
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Naproxen vs. Mefenamic Acid: Comparison Table Category Naproxen Mefenamic Acid 1. Drug Class NSAID (Non-Steroidal Anti-Inflammatory Drug) NSAID (Non-Steroidal Anti-Inflammatory Drug) 2. Common Brand Names Aleve, Naprosyn Ponstel (USA), Mefspas, Meftal 3. Mechanism of Action Inhibits COX-1 and COX-2, reducing prostaglandin synthesis Primarily COX-2 inhibition,...

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Naproxen vs. Mefenamic Acid: Comparison Table Category Naproxen Mefenamic Acid 1. Drug Class NSAID (Non-Steroidal Anti-Inflammatory Drug) NSAID (Non-Steroidal Anti-Inflammatory Drug) 2. Common Brand Names Aleve, Naprosyn Ponstel (USA), Mefspas, Meftal 3. Mechanism of Action Inhibits COX-1 and COX-2, reducing prostaglandin synthesis Primarily COX-2 inhibition, some COX-1, reduces prostaglandin synthesis 4. Use Duration Suitable for long-term use under supervision Recommended for short-term use only (≤7...

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Emergency safety firstUrgent warning signs are highlighted below.

Seek urgent medical care if you notice

These warning signs are general safety guidance. Local emergency numbers and clinical judgment should always come first.

  • Severe symptoms, breathing difficulty, fainting, confusion, or rapidly worsening illness.
  • New weakness, severe pain, high fever, or symptoms after a serious injury.
  • Any symptom that feels urgent, unusual, or unsafe for the patient.
1

Emergency now

Use emergency care for severe, sudden, rapidly worsening, or life-threatening symptoms.

2

See a doctor

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Naproxen vs. Mefenamic Acid: Comparison Table

Category Naproxen Mefenamic Acid
1. Drug Class NSAID (Non-Steroidal infection, or irritation, often causing pain, swelling, heat, or redness. সহজ বাংলা: শরীরের প্রদাহ; ব্যথা, ফোলা বা লালভাব হতে পারে।" data-rx-term="inflammation" data-rx-definition="Inflammation is the body’s response to injury, infection, or irritation, often causing pain, swelling, heat, or redness. সহজ বাংলা: শরীরের প্রদাহ; ব্যথা, ফোলা বা লালভাব হতে পারে।">inflammation, pain, or swelling. সহজ বাংলা: প্রদাহ/ফোলা/ব্যথা কমায়।" data-rx-term="anti-inflammatory" data-rx-definition="Anti-inflammatory means reducing inflammation, pain, or swelling. সহজ বাংলা: প্রদাহ/ফোলা/ব্যথা কমায়।">Anti-Inflammatory Drug) NSAID (Non-Steroidal infection, or irritation, often causing pain, swelling, heat, or redness. সহজ বাংলা: শরীরের প্রদাহ; ব্যথা, ফোলা বা লালভাব হতে পারে।" data-rx-term="inflammation" data-rx-definition="Inflammation is the body’s response to injury, infection, or irritation, often causing pain, swelling, heat, or redness. সহজ বাংলা: শরীরের প্রদাহ; ব্যথা, ফোলা বা লালভাব হতে পারে।">inflammation, pain, or swelling. সহজ বাংলা: প্রদাহ/ফোলা/ব্যথা কমায়।" data-rx-term="anti-inflammatory" data-rx-definition="Anti-inflammatory means reducing inflammation, pain, or swelling. সহজ বাংলা: প্রদাহ/ফোলা/ব্যথা কমায়।">Anti-Inflammatory Drug)
2. Common Brand Names Aleve, Naprosyn Ponstel (USA), Mefspas, Meftal
3. Mechanism of Action Inhibits COX-1 and COX-2, reducing prostaglandin synthesis Primarily COX-2 inhibition, some COX-1, reduces prostaglandin synthesis
4. Use Duration Suitable for long-term use under supervision Recommended for short-term use only (≤7 days)
5. Approved Indications pain, swelling, stiffness, or reduced movement. সহজ বাংলা: জয়েন্টের প্রদাহ।" data-rx-term="arthritis" data-rx-definition="Arthritis means joint inflammation causing pain, swelling, stiffness, or reduced movement. সহজ বাংলা: জয়েন্টের প্রদাহ।">Arthritis, gout, menstrual pain, muscle pain, tendonitis, backache Primary dysmenorrhea (menstrual pain), mild to moderate pain
6. Pain Intensity Used for moderate to severe pain More effective for mild to moderate pain
7. Onset of Action 30–60 minutes 15–30 minutes
8. Half-Life Long (12–17 hours) Short (2–4 hours)
9. Dosing Frequency 1–2 times daily 3–4 times daily
10. Adult Dosage 250–500 mg twice daily (max 1000–1250 mg/day) 250–500 mg every 6 hours (max 1500 mg/day, ≤7 days)
11. Pediatric Use Approved for use in children (age-specific dosing) Not recommended in children under 14 years
12. Pregnancy Category Category C (1st & 2nd trimester); D (3rd trimester) Category C (1st & 2nd trimester); D (3rd trimester)
13. Renal Safety Can affect kidney function with long-term use May cause nephrotoxicity if overused
14. GI Side Effects Common: stomach ulcers, gastritis, bleeding More likely to cause stomach cramps and diarrhea
15. Liver Toxicity Risk Low to moderate Slightly higher risk of liver enzyme elevation
16. Drug Interactions Interacts with anticoagulants, ACE inhibitors, diuretics Similar interactions but more cautious with warfarin
17. Menstrual Pain Use Effective, but not first-line Specifically effective for menstrual cramps
18. infection, or irritation, often causing pain, swelling, heat, or redness. সহজ বাংলা: শরীরের প্রদাহ; ব্যথা, ফোলা বা লালভাব হতে পারে।" data-rx-term="inflammation" data-rx-definition="Inflammation is the body’s response to injury, infection, or irritation, often causing pain, swelling, heat, or redness. সহজ বাংলা: শরীরের প্রদাহ; ব্যথা, ফোলা বা লালভাব হতে পারে।">inflammation, pain, or swelling. সহজ বাংলা: প্রদাহ/ফোলা/ব্যথা কমায়।" data-rx-term="anti-inflammatory" data-rx-definition="Anti-inflammatory means reducing inflammation, pain, or swelling. সহজ বাংলা: প্রদাহ/ফোলা/ব্যথা কমায়।">Anti-Inflammatory Power Strong infection, or irritation, often causing pain, swelling, heat, or redness. সহজ বাংলা: শরীরের প্রদাহ; ব্যথা, ফোলা বা লালভাব হতে পারে।" data-rx-term="inflammation" data-rx-definition="Inflammation is the body’s response to injury, infection, or irritation, often causing pain, swelling, heat, or redness. সহজ বাংলা: শরীরের প্রদাহ; ব্যথা, ফোলা বা লালভাব হতে পারে।">inflammation, pain, or swelling. সহজ বাংলা: প্রদাহ/ফোলা/ব্যথা কমায়।" data-rx-term="anti-inflammatory" data-rx-definition="Anti-inflammatory means reducing inflammation, pain, or swelling. সহজ বাংলা: প্রদাহ/ফোলা/ব্যথা কমায়।">anti-inflammatory effect Mild to moderate inflammation, pain, or swelling. সহজ বাংলা: প্রদাহ/ফোলা/ব্যথা কমায়।" data-rx-term="anti-inflammatory" data-rx-definition="Anti-inflammatory means reducing inflammation, pain, or swelling. সহজ বাংলা: প্রদাহ/ফোলা/ব্যথা কমায়।">anti-inflammatory effect
19. Cost & Availability Widely available, inexpensive Slightly more expensive, less widely available
20. Duration of Therapy Chronic pain conditions – can be used long-term under supervision Limited to short-term use due to GI & liver side effects

✅ Indications

Naproxen Mefenamic Acid
– Osteoarthritis, rheumatoid arthritis – Dysmenorrhea (menstrual pain)
– Gout and bursitis – Mild to moderate general pain
– Tendonitis, back pain – Muscle aches, dental pain (short use)
– Fever, migraine – Post-operative pain (short-term)

❌ Contraindications

Naproxen Mefenamic Acid
– Peptic ulcer, GI bleeding history – Active ulcer or GI bleeding
– Severe renal or hepatic impairment – Inflammatory bowel disease
– Asthma triggered by NSAIDs – Severe renal dysfunction
– Pregnancy (3rd trimester), breastfeeding – Pregnancy (3rd trimester), children <14
Drug Adult Dose Max Daily Dose Duration of Use
Naproxen 250–500 mg every 12 hours 1000–1250 mg Can be used long-term
Mefenamic Acid 250–500 mg every 6–8 hours 1500 mg Max 7 days

⚠️ Warning Signs (Stop Use and See Doctor)

  • For Both Drugs:

    • Black, tarry stools (GI bleeding)

    • Severe abdominal pain

    • Yellowing of skin/eyes (liver issue)

    • Unusual bruising or bleeding

    • Shortness of breath, chest pain

    • Skin rash or swelling of face/lips

    • High blood pressure symptoms

    • Changes in urination (kidney dysfunction)

💡 Which is Best and Safer?

Aspect Naproxen Mefenamic Acid
Safety in Long-Term Use ✅ Safer under supervision ❌ Not recommended for long-term use
Menstrual Pain Relief ✅ Effective, but not targeted ✅ Specifically effective for dysmenorrhea
GI Tolerability ❌ Risk of ulcer, but less diarrhea ❌ More diarrhea and cramps
Chronic Pain Conditions ✅ Suitable (arthritis, gout) ❌ Not suitable
Dosing Convenience ✅ 1–2 times/day ❌ 3–4 times/day

🟢 Conclusion:

  • Naproxen is better and safer for long-term use, chronic pain, arthritis, and general inflammation.

  • Mefenamic Acid is best suited for short-term relief of menstrual pain in young, healthy adults without GI or kidney problems.

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Safety note: This is not a prescription or diagnosis. For severe symptoms, pregnancy danger signs, children with serious illness, chest pain, breathing difficulty, stroke-like weakness, or major injury, seek urgent care.

Which doctor may help?

Start with a registered doctor or the nearest qualified health center.

What to tell the doctor

  • Write when the problem started and how it changed.
  • Bring old prescriptions, investigation reports, and current medicines.
  • Write allergies, pregnancy status, diabetes, kidney/liver disease, and major past illnesses.
  • Bring one family member if the patient is weak, elderly, confused, or a child.

Questions to ask

  • What is the most likely cause of my symptoms?
  • Which danger signs mean I should go to hospital quickly?
  • Which tests are necessary now, and which can wait?
  • How should I take medicines safely and what side effects should I watch for?
  • When should I come for follow-up?

Tests to discuss

  • Vital signs: temperature, pulse, blood pressure, oxygen saturation
  • Basic physical examination by a clinician
  • CBC, urine test, blood sugar, or imaging only when clinically needed

Avoid these mistakes

  • Do not use antibiotics, steroid tablets/injections, or strong painkillers without proper medical advice.
  • Do not hide pregnancy, kidney disease, ulcer, allergy, or blood thinner use.
  • Do not delay emergency care when danger signs are present.

Medicine safety and first-aid guide

This section is for patient education only. It does not replace a doctor, pharmacist, or emergency care.

Safe first steps

  • Avoid heavy lifting, sudden bending, and prolonged bed rest.
  • Use comfortable posture and gentle movement as tolerated.
  • Discuss physiotherapy, X-ray, or MRI only when clinically needed.

OTC medicine safety

  • For mild back pain, pain-relief medicine may be discussed with a doctor or pharmacist.
  • Avoid repeated painkiller use if you have kidney disease, stomach ulcer, uncontrolled blood pressure, or are taking blood thinners.

Avoid these mistakes

  • Do not start antibiotics without a proper medical decision.
  • Do not use steroid tablets or injections casually for quick relief.
  • Do not delay emergency care because of home remedies.

Get urgent help if

  • Back pain with leg weakness, numbness around private area, loss of urine/stool control, fever, cancer history, or major injury needs urgent care.
Medicine names, dose, and timing must be decided by a qualified clinician or pharmacist after checking age, pregnancy, allergy, other diseases, and current medicines.

For rural patients and family caregivers

Patient health record and symptom diary

Write your symptoms, medicines already taken, test results, and questions before visiting a doctor. This note stays on your device unless you print or copy it.

Doctor to discuss: Orthopedic / spine specialist, physical medicine doctor, or qualified clinician
Tests to discuss with doctor
  • Neurological examination for leg power, sensation, reflexes, and straight leg raise
  • X-ray only if injury, deformity, long-lasting pain, or doctor suspects bone problem
  • MRI discussion if severe nerve symptoms, weakness, bladder/bowel problem, or persistent symptoms
Questions to ask
  • What is the most likely cause of my symptoms?
  • Which warning signs mean I should go to emergency care?
  • Which tests are really needed now?
  • Which medicines are safe for my age, pregnancy status, allergy, kidney/liver/stomach condition, and current medicines?
  • Is physiotherapy, posture correction, or activity modification needed?

Emergency warning signs such as chest pain, severe breathing difficulty, sudden weakness, confusion, severe dehydration, major injury, or loss of bladder/bowel control need urgent medical care. Do not wait for online information.

Safe pathway to proper treatment

Care roadmap for: Differences Between Naproxen vs. Mefenamic Acid

Use this simple roadmap to understand the next safe steps. It is educational and does not replace examination by a doctor.

Go to emergency care if you notice:
  • Severe or rapidly worsening symptoms
  • Breathing difficulty, chest pain, fainting, confusion, severe weakness, major injury, or severe dehydration
Doctor / service to discuss: Qualified healthcare provider; specialist depends on symptoms and examination.
  1. Step 1

    Check danger signs first

    If danger signs are present, seek emergency care and do not wait for online information.

  2. Step 2

    Record the symptom story

    Write when symptoms started, severity, medicines already taken, allergies, pregnancy status, and test results.

  3. Step 3

    Visit a qualified clinician

    A doctor, nurse, or qualified healthcare provider can examine you and decide which tests or treatment are needed.

  4. Step 4

    Do only useful tests

    Do tests after clinical assessment. Avoid unnecessary tests, random antibiotics, or repeated medicines without diagnosis.

  5. Step 5

    Follow up and return early if worse

    If symptoms worsen, new warning signs appear, or treatment is not helping, return for review quickly.

Rural patient practical tips
  • Take a written symptom diary and all previous prescriptions/test reports.
  • Do not hide medicines already taken, even herbal or over-the-counter medicines.
  • Ask which warning signs mean urgent referral to hospital.

This roadmap is for education. A real diagnosis and treatment plan requires history, examination, and clinical judgment.

RX Patient Help

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Write your symptom story. A health professional or site editor can review it before any answer is prepared. This box is not for emergency care.

Emergency first: Severe chest pain, breathing trouble, unconsciousness, stroke signs, severe injury, heavy bleeding, or rapidly worsening symptoms need urgent local medical care now.

Frequently Asked Questions

Is this article a replacement for a doctor?

No. It is educational content only. Patients should consult a qualified clinician for diagnosis and treatment.

When should I seek urgent care?

Seek urgent care for severe symptoms, rapidly worsening condition, breathing difficulty, severe pain, neurological changes, or any emergency warning sign.

References

Add references, clinical guidelines, textbooks, journal articles, or trusted medical sources here. You can edit this area from the RX Article Professional Blocks panel.

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