What is diclofenac (Voltaren) used for? NSAID safety explained

What is diclofenac used for?

Diclofenac is a non-steroidal anti-inflammatory drug, or NSAID, used for pain and inflammation in suitable patients. Brands include Voltaren and, in some countries, Voltarol.

Tablets, capsules, suppositories, pain-relief gels and patches are different products. A separate higher-strength skin treatment for actinic keratosis is not the same as a pain-relief gel. Do not infer the indication or instructions from the active ingredient alone.

Formulation determines the instructions

Oral and rectal products act systemically. Topical pain products usually produce lower exposure, but side effects remain possible, particularly with inappropriate use over large areas.

NHS guidance describes gel application frequency varying with strength. This guide therefore does not give one number of applications for every gel or a universal oral dose.

Follow the actual product's directions for site, amount, frequency, age and duration. Ask before crushing a tablet, combining forms or changing from immediate-release to slow-release treatment.

Cardiovascular restrictions apply to systemic diclofenac

In its 2013 safety review, EMA identified increased cardiovascular risks with systemic diclofenac and contraindications for people with established ischaemic heart disease, peripheral arterial disease, cerebrovascular disease or relevant congestive heart failure.

A clinician should assess cardiovascular risk factors before prescribing. Use should be at the lowest effective dose for the shortest appropriate time.

This systemic warning should not be copied unchanged to every topical product, but lower exposure is not a promise that topical use has no risk.

Stomach, kidney and interaction checks

Systemic diclofenac can cause stomach or gut ulcers and bleeding and can affect kidneys. Tell the professional about previous ulcers, bleeding, heart or kidney disease, pregnancy, breastfeeding and reactions to aspirin or other NSAIDs.

Anticoagulants, prescribed aspirin, other NSAIDs and some additional medicines can change risk. Do not add ibuprofen or another NSAID without advice. Do not stop prescribed cardiovascular aspirin yourself to make room for diclofenac.

A stomach-protection medicine does not remove all cardiovascular or kidney concerns.

When symptoms need urgent care

Blood in vomit, chest pain, stroke-like symptoms, collapse or breathing difficulty requires emergency care. Black stools, serious abdominal symptoms, jaundice or increasing breathlessness and swelling needs prompt medical assessment. Do not drive yourself if seriously unwell.

Stop and seek advice about a significant reaction rather than assuming continued dosing will resolve it.

How to compare pain medicines

The safer option depends on the pain diagnosis, route, dose, duration and medical history. This guide does not claim diclofenac is the strongest NSAID, that one alternative is universally safer, or that topical use is equivalent to an oral course.

Ask what benefit is expected, when to review it and what to do if pain persists. Local prescription status and pharmacy stock also depend on the product and country.

Information and clinical decisions

This guide provides general information, not a diagnosis or personal treatment plan. Any clinical assessment and prescribing decision rests with an independent clinician. Prescrivia is a technology intermediary, not a medical provider or pharmacy; it does not prescribe, sell or dispense medicines. Assessment does not guarantee a prescription, medicine availability or a health outcome.

Further reading: treatment information.

Read about online consultations and their limits. Service information must not delay urgent local care.

Sources

1. NHS: diclofenac — NSAID uses, distinct formulations and the separate actinic-keratosis product.
2. NHS: taking or applying diclofenac — Dose and application depend on form and strength; lowest effective dose for shortest appropriate time.
3. EMA: systemic diclofenac cardiovascular advice, 2013 — Cardiovascular contraindications and risk assessment for systemic products.
4. NHS: diclofenac adverse effects — Lower topical exposure without zero risk, gastrointestinal/renal harms and urgent symptom escalation.

See the current clinical, legal and language review statuses for this edition. Source checks are editorial work, not approval.