Why this matters
ACE inhibitors and ARBs relax the kidney’s outgoing (efferent) blood vessel to protect it under high blood pressure; NSAIDs constrict the incoming vessel by blocking protective prostaglandins. Together they can drop blood flow through the kidney sharply, and blunt the blood-pressure medicine at the same time — both the antihypertensive effect and the kidney itself take a hit. Add a diuretic, which is common in the same patient, and the combination has a name in the literature: the triple whammy, a recognised cause of acute kidney injury.
In short: With a diuretic: the "triple whammy" → acute kidney injury.
What to do at the counter
- Avoid regular or long-term NSAID use in anyone on an ACE inhibitor or ARB, especially if they are also on a diuretic.
- Occasional short-course use is generally tolerated in someone with normal kidney function — the risk is with repeated or sustained use, particularly in older adults or anyone with reduced kidney function to begin with.
- If an NSAID is used for more than a few days, blood pressure and renal function are worth checking, and paracetamol remains the safer default recommendation.
Which medicines this covers
NSAIDs
ibuprofen, naproxen, diclofenac, dexketoprofen, ketoprofen, celecoxib, etoricoxib, indomethacin, piroxicam, meloxicam, aceclofenac
ACE inhibitors or ARBs
enalapril, lisinopril, ramipril, captopril, perindopril, quinapril, fosinopril, losartan, valsartan, olmesartan, irbesartan, candesartan, telmisartan
Checking a longer medication list, or a pair not listed here? Run it through the full drug interactions checker — it covers the whole list at once, pair by pair.
Frequently asked questions
Is the risk the same for ACE inhibitors and ARBs?
The mechanism and the practical advice are the same for both classes — ACE inhibitors (the -pril drugs) and ARBs (the -sartan drugs).
What is the "triple whammy" exactly?
An ACE inhibitor or ARB, plus a diuretic, plus an NSAID, taken together. Each pair on its own carries some risk; the third addition — most often the NSAID, added last and often over the counter — is what most reliably tips someone into acute kidney injury.
Does this apply to a one-off dose, or only regular use?
The risk scales with duration. A single dose for a headache is a different conversation from a week-long course, and the advice below reflects that: occasional use is usually fine, sustained use is where this matters.