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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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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OTC medicine safety

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  • Avoid repeated painkiller use if you have kidney disease, stomach ulcer, uncontrolled blood pressure, or are taking blood thinners.

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  • Back pain with leg weakness, numbness around private area, loss of urine/stool control, fever, cancer history, or major injury needs urgent care.
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  • 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?
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Doctor / service to discuss: Qualified healthcare provider; specialist depends on symptoms and examination.
  1. Step 1

    Check danger signs first

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  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.
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