Voltaren drug interactions: a practical overview
Drug interactions are the single biggest cause of preventable medication problems. Voltaren (Diclofenac) interacts to varying degrees with several classes of medication and with a smaller list of foods. This page summarises the practically important ones at 25mg, 50mg, 75mg, 100mg, framed for a real-world prescription review rather than an exhaustive PDF list.
High-priority interactions for Voltaren
For Diclofenac, the most clinically relevant interactions are typically with strong CYP3A4 inhibitors and inducers, with cardiovascular medications (notably nitrates for several Pain Relief Medications agents), with central nervous system depressants, and with medications affecting blood pressure or heart rate. Diclofenac reversibly inhibits cyclooxygenase enzymes COX-1 and COX-2, with somewhat greater selectivity for COX-2 than ibuprofen and naproxen.
Working with the pharmacist
A pharmacist review of all current medications is the practical safeguard against unintended interactions with Voltaren. According to the prescribing information for Diclofenac, the full medication list — prescription, OTC, supplements and recreational substances — should be reviewed before starting and at every dose change at 25mg, 50mg, 75mg, 100mg.
Frequently asked questions
What's the most important Voltaren interaction to know? ▾
For most Pain Relief Medications medications, the highest-priority interaction is with nitrate medications used for chest pain — this combination is often a hard contraindication. After that, strong CYP3A4 inhibitors (some antifungals, macrolides) are the next concern at routine 25mg, 50mg, 75mg, 100mg doses.
Do I need to tell the pharmacist about supplements? ▾
Yes. Supplements and herbal products can interact with Voltaren in ways that prescription drug-drug interaction databases miss. The pharmacist needs the complete picture — including supplements like St John's Wort, grapefruit-containing products and high-dose vitamins — to flag risks at 25mg, 50mg, 75mg, 100mg.
More on Voltaren
- With alcoholVoltaren and alcohol — is it safe to drink?
- With foodShould Voltaren be taken with food?
- Side effectsVoltaren side effects: common, rare and warning signs
- Dosage guideVoltaren dosage guide: how much to take and when
- OnsetHow fast does Voltaren start working?
- DurationHow long does Voltaren last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.