Part of the Access Doctor pain guide.
NSAIDs Compared: Ibuprofen vs Naproxen vs Diclofenac UK
All three reduce inflammation via the same basic mechanism — but they differ in duration, onset, dosing frequency, topical availability, and their relative side-effect profiles. A UK clinical comparison guide.
▶ Quick answer
Ibuprofen, naproxen, and diclofenac all inhibit COX-1 and COX-2 enzymes, reducing prostaglandin-driven inflammation and pain. Naproxen lasts longest (twice-daily dosing). Ibuprofen acts fastest. Diclofenac gel provides topical delivery with minimal systemic side effects. The right choice depends on your pain type, location, and risk factors.
The Three Main Prescription NSAIDs Available at Access Doctor
| Ibuprofen | Naproxen | Diclofenac gel | |
|---|---|---|---|
| Drug class | Propionic acid NSAID | Propionic acid NSAID | Phenylacetic acid NSAID (topical) |
| Route | Oral | Oral | Topical (skin) |
| Prescription dose | 600mg three times daily | 250–500mg twice daily | 1% (OTC and Rx) or 2.32% (Rx) |
| Onset | 20–30 minutes | ~1 hour | Variable (slower onset, sustained effect) |
| Duration per dose | 4–6 hours | 8–12 hours | Sustained with regular application |
| Dosing frequency | 3× daily | 2× daily | 2–4× daily (depending on strength) |
| Systemic effects | Full systemic distribution | Full systemic distribution | Minimal — <10% systemic absorption |
Full Comparison Table
| Property | Ibuprofen 600mg | Naproxen 500mg | Diclofenac gel |
|---|---|---|---|
| GI risk | Moderate — take with food + PPI for regular use | Moderate — PPI recommended | Low — no PPI typically needed |
| Cardiovascular risk | Low at standard doses; increases with high dose/prolonged use | Considered relatively favourable among oral NSAIDs | Very low (minimal systemic absorption) |
| Renal risk | Present — caution in renal impairment | Present — caution in renal impairment | Very low |
| Suitable for gout | Yes | Yes — NICE first-line | No (systemic inflammation, inaccessible joint) |
| Suitable for period pain | Yes — effective | Yes — effective | No (systemic effect needed) |
| Suitable for knee OA | Yes | Yes | Yes — NICE endorses topical NSAID first-line for knee OA |
| Safe in pregnancy | Avoid in third trimester | Avoid in third trimester | Avoid in third trimester |
| Aspirin-sensitive asthma | Contraindicated | Contraindicated | Use with caution |
| PPI needed? | Recommended | Recommended | Generally not |
Which NSAID for Which Condition?
| Condition | First choice | Rationale |
|---|---|---|
| Acute gout | Naproxen | NICE first-line; rapid, sustained anti-inflammatory effect; twice-daily dosing through the attack |
| Knee osteoarthritis | Diclofenac gel | NICE endorses topical NSAID first; fewer systemic side effects; directly accessible joint |
| Period pain | Ibuprofen or naproxen | Both highly effective; naproxen lasts longer per dose; ibuprofen acts faster |
| Back pain / sprain (acute) | Ibuprofen or naproxen | Ibuprofen if fast onset preferred; naproxen if less frequent dosing important |
| Shoulder / elbow tendinitis | Diclofenac gel | Topical delivery directly to the affected superficial tendon; avoids systemic NSAID side effects |
| Dental pain | Ibuprofen | Fast onset; oral route; commonly combined with paracetamol post-extraction |
| Rheumatoid arthritis | Naproxen or ibuprofen | Systemic disease requires oral NSAID; choice depends on patient history and risk factors |
Gastrointestinal Risk Comparison
All oral NSAIDs inhibit gastric mucosal COX-1, reducing protective prostaglandins in the stomach. At equivalent doses and durations, the GI risk hierarchy among oral NSAIDs is: diclofenac ≤ ibuprofen < naproxen at lower doses, though the differences are modest and highly individual.
Key mitigation: always take oral NSAIDs with food, co-prescribe a PPI for regular use, and use the lowest effective dose for the shortest necessary time. Topical diclofenac avoids this concern almost entirely.
Never take two oral NSAIDs simultaneously. The combination multiplies GI risk without any additional therapeutic benefit. You can safely combine any oral NSAID with paracetamol.
Cardiovascular Risk
All NSAIDs carry some degree of cardiovascular risk with prolonged use. Among commonly prescribed NSAIDs, naproxen is generally considered to have the most favourable cardiovascular risk profile in observational data — a consideration when prescribing for chronic conditions in patients with CV risk factors.
Topical diclofenac has minimal systemic absorption and therefore negligible cardiovascular risk at standard application doses.
How to Choose the Right NSAID
In practice, the decision is driven by:
- Location and accessibility of the pain: localised, accessible joint or tendon → diclofenac gel first; systemic or inaccessible → oral NSAID
- Dosing convenience: naproxen’s twice-daily dosing suits people managing a busy schedule or who want fewer daily doses
- Speed of onset: dental pain, acute injury, or period pain where fast relief matters → ibuprofen
- GI sensitivity: history of gastric problems, on anticoagulants, or elderly → diclofenac gel preferred; if oral needed, add PPI
- Gout: naproxen is NICE first-line
If you are unsure which NSAID is right for your situation, an online clinical consultation at Access Doctor will match the appropriate prescription to your pain type and medical history.
Get the Right NSAID Prescribed Online
Our GPhC-registered prescribers assess your pain type and medical history to prescribe the most appropriate NSAID. Naproxen, ibuprofen 600mg, and diclofenac gel available. GPhC pharmacy #9011198.
Start Consultation →Frequently Asked Questions
Which NSAID is best for gout?
Naproxen is NICE first-line for acute gout. It provides rapid, sustained anti-inflammatory effect and twice-daily dosing covers the typical 7–10 day gout attack without frequent redosing. Ibuprofen is an effective alternative.
Which NSAID has the least gastrointestinal side effects?
Diclofenac gel has the lowest GI risk due to minimal systemic absorption — a PPI is generally not needed. Among oral NSAIDs, all carry GI risk and a PPI is recommended with regular use. The differences in GI risk between naproxen and ibuprofen at standard doses are modest; mitigation (food, PPI) is more important than choice of agent.
Can I take ibuprofen and naproxen together?
No — never combine two NSAIDs. Taking ibuprofen and naproxen simultaneously multiplies GI, renal, and cardiovascular risk without any additional pain-relieving benefit. You can safely combine either NSAID with paracetamol.
Is naproxen safer than ibuprofen for the heart?
Naproxen is generally considered to have a more favourable cardiovascular risk profile than some other NSAIDs in observational studies. However, all oral NSAIDs carry some CV risk with prolonged use, and any CV risk factors should be discussed with a prescriber before starting an NSAID.
When should I use diclofenac gel instead of an oral NSAID?
Use diclofenac gel when the pain is localised to an accessible superficial joint or soft tissue — such as knee osteoarthritis, tennis elbow, or shoulder tendinitis. It is also preferable in patients who cannot tolerate oral NSAIDs due to gastric sensitivity or who need to minimise systemic side effects.
References
- NICE. Osteoarthritis: care and management. CG177.
- NICE CKS. NSAIDs — prescribing issues. Updated 2023.
- NICE CKS. Gout. Updated 2023.
- Patrono C & Baigent C. Nonsteroidal anti-inflammatory drugs and the heart. Circulation. 2014.
Medical disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before starting or changing any treatment. In a medical emergency, call 999.