8 Common Medications That Can Harm Your Kidneys—and Why Self-Medicating Is Risky
Most medicines are safe when taken at the right dose, but some can stress the kidneys or cause kidney injury, particularly when taken at high doses, for long periods, during dehydration, or in people who already have kidney disease.
1. NSAID painkillers
Medicines such as ibuprofen, naproxen, and diclofenac can reduce blood flow through the kidneys. The risk is higher with high doses, prolonged use, dehydration, or existing kidney disease.
2. Aspirin at high doses
Low-dose aspirin prescribed for cardiovascular protection is different from high-dose aspirin used for pain. Higher doses can affect kidney function, particularly in vulnerable people.
3. Certain antibiotics
Some antibiotics can cause kidney problems in susceptible individuals. Examples include aminoglycosides, such as gentamicin, and certain other antibiotics. Kidney function and dosing may need monitoring.
4. Some antiviral medicines
Certain antivirals can affect the kidneys or require dose adjustments when kidney function is reduced.
5. ACE inhibitors and ARBs
Medicines such as lisinopril, enalapril, losartan, and valsartan are commonly used to protect the kidneys in some people with high blood pressure or diabetes. However, they can cause a rise in creatinine or potassium, particularly during dehydration or when combined with certain other medicines. They should not be stopped simply because they’re on this list.
6. Diuretics (“water pills”)
Medicines such as furosemide and hydrochlorothiazide can be useful for blood pressure and fluid retention. However, excessive dosing or dehydration can reduce kidney function and disturb electrolytes.
7. Proton-pump inhibitors (PPIs)
Medicines such as omeprazole and pantoprazole have been associated with acute interstitial nephritis and, in observational studies, with certain kidney outcomes. This doesn’t mean people should stop a necessary PPI without medical advice.
8. Certain chemotherapy and other specialized medicines
Some cancer treatments and other prescription medicines can be directly toxic to the kidneys or require careful dosing based on kidney function.
Why self-medicating can be dangerous
The risk often comes from combinations rather than one medicine alone. For example, taking an NSAID together with an ACE inhibitor/ARB and a diuretic can substantially increase the risk of acute kidney injury, particularly during dehydration.
Before taking an over-the-counter painkiller or supplement regularly, especially if you are older, dehydrated, have kidney disease, heart failure, high blood pressure, or diabetes, check with a doctor or pharmacist.
Seek medical attention if you develop markedly reduced urine output, blood in the urine, significant swelling, severe weakness, confusion, or shortness of breath while taking a medication.
