Voltaren gel contains diclofenac, an anti-inflammatory, applied to the skin over a painful joint or muscle. Because far less is absorbed into the bloodstream than from a tablet, the stomach, kidney and heart risks associated with oral anti-inflammatories are substantially lower.
Lower is not zero, and this is the point people miss: it is still an NSAID. Using the gel while also taking ibuprofen or another anti-inflammatory tablet means taking two NSAIDs, which adds risk without adding benefit. It counts towards your total.
Common side effects of this pharmacy medicine or category
- Redness, itching, dryness or a rash where it is applied
- A burning or tingling sensation on application
- Increased sensitivity to sunlight on treated skin
Most effects are local and mild. Digestive effects are uncommon but possible, particularly with large amounts, prolonged use or application over a wide area.
Practical points: wash your hands after applying unless you are treating them, keep it away from eyes and mouth, do not apply to broken or infected skin, and do not cover with a dressing unless advised. Cover treated skin or keep it out of strong sun. See pain relief gel side effects.
Interactions and duplicate-ingredient risks
Do not use alongside oral anti-inflammatories such as ibuprofen or diclofenac tablets, or combination painkillers containing them, without checking. This includes products like Myprodol, which contains ibuprofen. See NSAID side effects.
Also mention it if you take blood thinners, since even limited absorption can add to bleeding risk, and if you use other topical products on the same area.
Paracetamol works differently and can generally be used alongside, but confirm with a pharmacist.
Children, pregnancy, older adults and chronic medicine cautions
- Pregnancy. Anti-inflammatories including topical ones are generally avoided, particularly later in pregnancy. Ask first.
- Asthma. A minority of people with asthma react to NSAIDs. If oral ones have caused wheeze, mention it.
- Previous stomach ulcer, kidney disease or heart failure. The topical route is often chosen precisely because it is gentler, but confirm it is appropriate for you.
- Older adults, for whom a gel is frequently the safer choice over tablets.
Warning signs and overdose concerns
Stop and get advice for a severe or spreading rash, blistering, or skin that becomes very sore. Get emergency help for difficulty breathing, wheeze, or swelling of the face, lips or throat.
Seek advice if pain persists beyond the period on the label, or if you find yourself using it continuously for weeks. Ongoing joint pain needs a cause rather than indefinite treatment.
Questions to ask a pharmacist before using it
- Is this suitable given my other medicines and conditions?
- Am I already taking an anti-inflammatory in tablet form?
- How much should I use, and how often?
- How long before I should see a doctor instead?
- Can I take paracetamol alongside it?
Related OTC and medicine-safety guides
- OTC medicine side effects
- Painkiller side effects
- Over-the-counter medicine interactions
- When to see a doctor about an OTC medicine
- Report an OTC medicine side effect
See also diclofenac gel, muscle rubs and topical medicine side effects.
Medical Disclaimer: This content is for informational and educational purposes only and does not constitute medical diagnosis, prescription, or professional advice. Always read the patient information leaflet and consult a qualified doctor or pharmacist regarding any medicine or health concern.