Diclofenac
Tablet, gel or injection
Quick Summary
Diclofenac is an NSAID that reduces pain and swelling. Gels applied to the skin carry less risk than tablets.
Medical Uses
How it's taken
Tablets are taken with or after food for the shortest time possible. Gel is rubbed gently onto the painful area.
Your doctor decides the right dose for you and how long to take it.
Your doctor decides the right dose for you. Follow their instructions and the label.
Common Side Effects
Stomach upset
Indigestion and pain.
Headache
And dizziness.
Stomach bleeding
A serious risk with long use.
Interactions
Blood thinners
Increase bleeding risk.
Blood pressure and water tablets
Risk to kidneys.
Other NSAIDs
Avoid combining.
Critical Warnings
Heart and stroke risk
Black Box Warning: Tablets carry a higher heart risk than some other painkillers; avoid if you have heart disease.
Stomach and kidney problems
Not suitable for some people; ask your doctor.
Not in dengue
Avoid in suspected dengue.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- Diclofenac: drug information(opens in a new tab) · MedlinePlus, US National Library of Medicine
- Diclofenac: a medicine to treat pain and swelling(opens in a new tab) · NHS