Supplements and Etoricoxib.
Etoricoxib, sold under the brand name Arcoxia, is a non-steroidal anti-inflammatory drug (NSAID): it inhibits cyclooxygenase enzymes, with documented gastrointestinal and renal long-term risks.
Etoricoxib is an NSAID, a non-steroidal anti-inflammatory drug. The class inhibits cyclooxygenase enzymes (COX-1 and COX-2 depending on selectivity), reducing pain and inflammation driven by prostaglandins. It also reduces the protective gastric and renal prostaglandin signalling that drives the side effect profile. Use at high doses or sustained over time carries gastric ulceration risk (mitigated when a PPI is given alongside), reduced antihypertensive effect of ACE inhibitors and ARBs, additive renal stress in CKD3+, and additive antiplatelet effect with aspirin or clopidogrel. The supplement surface divides into two patterns. Compounds that target the same pathway (curcumin, boswellia, omega-3 EPA at higher doses) overlap mechanism with NSAIDs in the COX cascade. Additive effects are real but rarely problematic at OTC doses. Ginkgo, garlic extract, and fish oil at high doses add to bleeding risk when stacked with NSAIDs, especially around dental work or surgery.
Below are the 3 documented pairs we have explicitly assessed against Etoricoxib in the Distil database: 2 amber and 1 green. The pairs cluster around 3 mechanisms: Additive hyperkalaemia (raised potassium), Reduced renal lithium clearance, and COX-2 selective (platelet-sparing). Every call is cited to either a clinical reference (PMID) or the British National Formulary. Anything not on this list is either still to be assessed or beyond our database scope. The checker beneath surfaces assessments by supplement, and the missing-item form at the bottom of the page routes any uncatalogued supplement into our next curation pass.
Documented interactions
Additive hyperkalaemia (raised potassium)
Anti-inflammatory painkillers like etoricoxib can make the kidneys hold on to a little more potassium. On their own the effect is usually small, but added to a potassium supplement, and especially if your kidneys are not working at full strength or you take a blood-pressure medicine that also raises potassium, it can nudge your potassium higher. If you take etoricoxib regularly, mention any potassium supplement to your GP or pharmacist.
Reduced renal lithium clearance
Anti-inflammatory painkillers such as etoricoxib can make the kidneys hold on to lithium, which raises the lithium level in the blood. With prescription lithium this is a recognised caution. At the small amount of lithium in a typical lithium orotate supplement (around 5 mg) the effect is expected to be very small; it matters more for higher-strength products (around 20 mg) and for anyone whose kidney function is reduced. If you take regular anti-inflammatories, check with your pharmacist or GP before using a lithium supplement.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
COX-2 selective (platelet-sparing)
Etoricoxib is a COX-2 selective anti-inflammatory, so unlike standard anti-inflammatories such as ibuprofen or naproxen it has little effect on platelets and bleeding. That means adding fish oil is much less of a bleeding concern with etoricoxib than with a standard NSAID. Etoricoxib does carry its own stomach and heart-related cautions that are separate from fish oil, so follow the advice you have been given for the drug itself.
What this list does not say. Pairs not flagged here are not implicitly safe. They are either not yet in our database, or fall outside our inclusion scope (food-supplement interactions only; for drug-drug interactions, the BNF is authoritative). Use the checker below to surface any supplement, and submit a missing item if you take something we have not catalogued.
How we grade severity, choose what's in scope, and what we exclude.
Every call on this page is reasoned. We publish the full rubric for severity tiers, the medication inclusion logic, the evidence grades we accept, and what we deliberately leave out. About three thousand words. Worth reading once if you use this tool more than occasionally.
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This page checks the pairs you enter. The personalised Distil report goes further:
- the same graded, cited interaction check across your whole stack, not just the pairs you thought to type in
- where your current routine may be leaving you short of your goals
- the evidence-backed compounds worth adding, and the ones worth dropping
It's a paid report: £79, or £49 for the first 25 customers. The interactions check is one section of it, and you can read a real one in full before you buy.
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