The short answer
If you have chronic kidney disease (CKD), the main over-the-counter pain relievers to be cautious about are NSAIDs (nonsteroidal anti-inflammatory drugs), including ibuprofen, naproxen, and high-dose aspirin.
These medicines can reduce blood flow through the kidneys and may trigger acute kidney injury (AKI) or worsen existing CKD, particularly with higher doses, repeated use, dehydration, or other risk factors. The National Kidney Foundation advises people with CKD to avoid self-treating with NSAIDs and to discuss them with a healthcare professional first. (National Kidney Foundation)
There is also an ear-related issue: salicylates such as aspirin can cause tinnitus (ringing in the ears) and temporary hearing changes, especially at high doses. NSAIDs as a group have also been associated with tinnitus and hearing effects, but this does not mean that occasional recommended use automatically causes permanent hearing damage. (PubMed)
So the concern is real, but the title needs some qualification: these medicines are not equally nephrotoxic or ototoxic, and the risk depends heavily on dose, duration, kidney function, hydration, and individual health factors.
Which OTC pain relievers are the main concern?
| Medicine | Kidney concern | Ear/hearing concern |
|---|---|---|
| Ibuprofen | Can reduce kidney blood flow and cause AKI or worsen CKD | Tinnitus/hearing effects have been reported, particularly with higher exposure |
| Naproxen | Similar NSAID kidney risks | Tinnitus/hearing effects can occur |
| High-dose aspirin | Acts like an NSAID and can affect kidney blood flow | Well-established association with tinnitus and temporary hearing loss at high doses |
| Acetaminophen | Generally considered kidney-safe at recommended doses | Not considered a typical ototoxic pain reliever |
The distinction between high-dose aspirin and low-dose aspirin is particularly important. Low-dose aspirin may be prescribed for cardiovascular protection and should not be stopped simply because you have CKD. Higher doses used for pain behave more like other NSAIDs from a kidney perspective. (National Kidney Foundation)
Why can NSAIDs hurt the kidneys?
Your kidneys need adequate blood flow to filter your blood. NSAIDs block enzymes involved in producing prostaglandins, substances that help maintain kidney blood flow under certain conditions.
This becomes more important when the kidneys are already vulnerable.
NSAIDs are therefore more concerning when someone has:
- CKD or a low eGFR
- dehydration or significant fluid loss
- heart failure
- liver disease
- older age
- high blood pressure
- treatment with certain blood-pressure medicines or diuretics
The combination of an NSAID + an ACE inhibitor or ARB + a diuretic can be particularly concerning for kidney function, especially during dehydration or acute illness. (National Kidney Foundation)
Importantly, an NSAID-related rise in creatinine does not automatically mean permanent kidney damage. Some episodes of AKI can improve after the underlying problem is corrected. Whether kidney function recovers depends on the severity of the injury and the person’s overall health.
What about tinnitus and hearing loss?
This part of the title also needs context.
Aspirin and other salicylates are the clearest example. High doses can cause tinnitus and temporary hearing loss. Human and experimental research has consistently documented this effect, and it is generally dose-related and reversible after the exposure ends. (PubMed)
NSAIDs such as ibuprofen and naproxen have also been associated with tinnitus and hearing changes. However, describing every NSAID as a drug that causes permanent hearing damage would be misleading. The available evidence is much stronger for temporary auditory effects associated with higher exposure than for permanent hearing loss from ordinary occasional use. (PubMed)
If ringing in your ears begins or becomes noticeably worse after starting or increasing a pain medicine, tell your healthcare professional rather than assuming the symptom is harmless or permanently caused by the drug.
Is acetaminophen safer for people with CKD?
For the kidneys, acetaminophen (paracetamol) is generally considered safer than NSAIDs when taken at recommended doses. The National Kidney Foundation specifically notes that it is generally safe for the kidneys at recommended doses. (National Kidney Foundation)
That does not make it appropriate for everyone or for every type of pain.
Acetaminophen can cause serious liver injury when too much is taken, and it appears in many combination products, including some cold and flu medicines. Accidentally taking multiple products containing acetaminophen is therefore an important safety issue.
If you have liver disease, regularly drink substantial amounts of alcohol, or take several combination medicines, ask a healthcare professional or pharmacist about the appropriate product for you.
What if you have CKD but already took ibuprofen or naproxen?
Do not assume that one dose means your kidneys have been permanently damaged.
The risk depends on factors such as:
- your baseline kidney function
- how much you took
- how often you take it
- whether you were dehydrated
- other medications you use
- whether you have heart failure or other medical conditions
If you have CKD and have been using NSAIDs repeatedly, it is sensible to tell your clinician or pharmacist. They may decide whether your creatinine/eGFR, potassium, blood pressure, or other tests need review.
A single abnormal creatinine result also needs context. The change from your previous result, the time interval, hydration status, recent illness, and medications can all matter.
Check labels carefully
NSAIDs can appear in combination products, so simply choosing a different brand name does not necessarily avoid the problem.
Look at the active ingredients and watch for medicines containing:
- ibuprofen
- naproxen
- aspirin
- other NSAIDs
Do not assume that a product is kidney-safe just because it is sold without a prescription.
Also remember that topical pain medicines are different from oral NSAIDs. For example, topical diclofenac produces much lower systemic exposure than oral NSAIDs and may have a lower kidney risk when used correctly, although it is still worth discussing with a clinician if you have significant CKD. (National Kidney Foundation)
When should you seek medical attention?
If you have kidney disease and develop very low urine output, severe weakness, confusion, severe vomiting or dehydration, marked swelling, chest pain, or severe shortness of breath after an illness or medication exposure, seek prompt medical attention.
If you develop new sudden hearing loss, particularly in one ear, that also deserves urgent medical assessment rather than being assumed to be a medication side effect.
What should kidney patients do before taking an OTC painkiller?
A practical approach is:
- Check the active ingredient, not just the brand name.
- If you have CKD, ask a pharmacist or clinician before using an oral NSAID.
- Do not combine several pain or cold medicines without checking their ingredients.
- Tell your healthcare team about regular OTC medication use.
- Do not stop prescribed low-dose aspirin or other medicines without discussing it with the prescriber.
- If pain is frequent or persistent, address the cause of the pain rather than repeatedly treating it with OTC medication.
Bottom line
For people with CKD, ibuprofen, naproxen, and high-dose aspirin deserve particular caution because NSAIDs can reduce kidney blood flow and cause AKI or worsen kidney function. The risk is greater with repeated use, high doses, dehydration, and other medical conditions. (National Kidney Foundation)
High-dose aspirin and other salicylates can also cause tinnitus and temporary hearing changes. NSAIDs can produce auditory side effects in some circumstances, but calling every OTC painkiller permanently ototoxic would be an oversimplification. (PubMed)
For many people with CKD, acetaminophen/paracetamol is generally a kidney-safer option at recommended doses, but the right pain treatment still depends on the person’s kidney function, other medical conditions, medications, and the cause of the pain. (National Kidney Foundation)