Your kidneys work around the clock to filter waste from your blood, balance fluids and minerals, and help regulate blood pressure. But certain medications can affect kidney function, particularly when taken at high doses, used for long periods, or combined with other medicines.
The risk can be higher for older adults and people living with chronic kidney disease, diabetes, high blood pressure, or dehydration. The good news is that many medication-related kidney problems can be prevented through appropriate dosing, monitoring, and guidance from a healthcare professional.
Here are eight medication groups to know about, why they may affect the kidneys, and how to use them more safely.
1. Nonsteroidal Anti-Inflammatory Drugs (NSAIDs)
NSAIDs are widely used to relieve pain, fever, and inflammation. Common examples include ibuprofen, naproxen, and diclofenac tablets.
These medications can reduce blood flow to the kidneys. In some people, particularly those who are dehydrated or already have kidney disease, this can trigger acute kidney injury. Long-term or high-dose use can also worsen existing kidney problems.
How to reduce the risk: Avoid taking NSAIDs regularly without medical advice, especially if you have kidney disease, heart failure, high blood pressure, or take certain blood pressure medicines or diuretics. Ask a pharmacist or clinician which pain-relief option is appropriate for you.
Antibiotics are essential for treating bacterial infections, but some can affect the kidneys or build up in the body when kidney function is reduced.
The risk depends on the specific antibiotic, its dose, the duration of treatment, and the patient's health. Some antibiotics can cause kidney inflammation or other forms of kidney injury, while others mainly require dose adjustments in people with reduced kidney function.
How to reduce the risk: Take antibiotics exactly as prescribed. Tell your healthcare professional if you have kidney disease, and ask whether your dose needs adjusting. Do not stop a prescribed antibiotic or change its dose on your own.
3. Proton Pump Inhibitors (PPIs)
Proton pump inhibitors reduce stomach acid and are commonly used to treat acid reflux, heartburn, and stomach ulcers. Examples include omeprazole, pantoprazole, and lansoprazole.
These medicines are helpful for many patients. However, in rare cases, they can cause interstitial nephritis, an inflammatory reaction affecting the kidneys. Some studies have also found an association between long-term PPI use and chronic kidney disease, although an association does not prove that the medicine directly caused the disease.
How to reduce the risk: If you take a PPI for a long time, ask your clinician periodically whether you still need it and whether your dose is appropriate. Do not discontinue a prescribed medicine without discussing it with your healthcare professional.
4. Diuretics, Also Known as Water Pills
Diuretics help the body remove excess salt and water through urine. They are used to treat conditions such as high blood pressure, heart failure, and fluid retention.
Examples include furosemide and hydrochlorothiazide.
These medicines can be beneficial, but excessive fluid loss may cause dehydration, low blood pressure, or electrolyte imbalances. In some circumstances, this can reduce blood flow to the kidneys and impair their function.
How to reduce the risk: Follow your prescribed dose and attend recommended blood tests. Ask your clinician how to manage your medication during vomiting, diarrhea, or another illness that may cause dehydration. Do not increase your fluid intake without advice if you have heart failure or have been told to restrict fluids.
5. ACE Inhibitors and ARBs
These medications are commonly prescribed for high blood pressure, heart failure, and certain types of kidney disease.
Examples include lisinopril and ramipril (ACE inhibitors), and losartan and valsartan (ARBs).
This category needs an important clarification: these medicines often protect the kidneys over the long term. They can cause a small change in kidney blood-test results after treatment begins, which is why monitoring is important. In some circumstances, however, kidney function can deteriorate significantly, particularly during dehydration or when certain other medicines are taken at the same time.
How to reduce the risk: Have kidney function and potassium checked as recommended. Consult your clinician or pharmacist before adding an NSAID such as ibuprofen, especially if you also take a diuretic. Never stop blood pressure medication just because you read that it can affect the kidneys.
Lithium is a prescription medicine used to treat certain mental health conditions, including bipolar disorder.
Long-term lithium treatment can affect the kidneys in some patients. It can also cause toxicity if levels in the blood become too high. Dehydration, changes in salt intake, and interactions with other medicines can increase the risk of elevated lithium levels.
How to reduce the risk: People taking lithium should follow their monitoring schedule, including blood tests for lithium levels and kidney function. Seek medical advice promptly if you develop significant vomiting, diarrhea, dehydration, worsening tremors, confusion, or unusual drowsiness. Do not stop lithium abruptly without medical guidance.
7. Certain Antiviral Medicines
Some antiviral medications, including certain drugs used to treat viral infections, can cause kidney-related side effects or require dose adjustments when kidney function is reduced.
The risk varies widely by medicine. Some treatments can form crystals in the urine or affect kidney cells, while others may accumulate in the body if the kidneys cannot remove them efficiently.
How to reduce the risk: Tell your prescriber if you have kidney disease or take other medicines that can affect kidney function. Take the medication exactly as directed and complete any recommended blood tests. Never alter an antiviral dose without medical advice.
8. Certain Cancer Medicines
Some chemotherapy and other cancer treatments can affect kidney function. The risk depends on the specific medication, dose, treatment schedule, hydration status, and the patient's overall health.
For example, cisplatin, a chemotherapy medicine, is known to have the potential to cause kidney injury. Cancer teams often monitor kidney function and electrolytes before and during treatment and may adjust the treatment plan when necessary.
How to reduce the risk: Follow your oncology team's instructions about blood tests, fluids, and other precautions. Report reduced urination, unusual swelling, persistent vomiting, or other new symptoms promptly. Do not change or delay cancer treatment without speaking with your oncology team.
Warning Signs That May Need Medical Attention
Kidney problems do not always cause noticeable symptoms in the early stages. Blood and urine tests are often needed to identify changes in kidney function.
Possible warning signs include:
Urinating much less than usual.
New or worsening swelling in the legs, ankles, or feet.
Unexplained nausea, vomiting, or marked fatigue.
Shortness of breath, especially with swelling.
Confusion or unusual drowsiness in severe cases.
These symptoms can have many causes and do not automatically mean that a medication has damaged your kidneys.
Seek urgent medical care if you develop very little or no urine, severe shortness of breath, confusion, or rapidly worsening symptoms.
Who Should Be Especially Careful?
People may need extra medication review if they:
Have chronic kidney disease or a previous episode of acute kidney injury.
Have diabetes or high blood pressure.
Are older and take several medicines.
Have recently experienced vomiting, diarrhea, or dehydration.
Take multiple medicines that affect blood pressure, fluid balance, or kidney function.
A doctor or pharmacist can review the full medication list, including over-the-counter painkillers, supplements, and combination cold remedies.
Five Practical Ways to Protect Your Kidneys
1. Keep an updated medication list. Include prescription medicines, over-the-counter products, vitamins, and supplements.
2. Ask before using painkillers regularly. Ibuprofen, naproxen, and other NSAIDs may not be suitable for everyone.
3. Attend recommended blood tests. Kidney function and electrolyte checks can help identify problems before symptoms appear.
4. Ask what to do during illness. Vomiting, diarrhea, and dehydration can change how safely certain medicines can be taken. Get a personalized plan rather than stopping medicines on your own.
5. Never assume a prescribed medicine is harmful simply because it affects the kidneys. Some medicines protect kidney function, and others are essential for treating serious conditions. The correct dose and appropriate monitoring make a difference.
Frequently Asked Questions
Can common painkillers damage the kidneys?
Yes. NSAIDs such as ibuprofen and naproxen can reduce blood flow to the kidneys and may cause acute kidney injury, particularly in people with kidney disease, dehydration, or certain other medical conditions.
Should I stop taking blood pressure medicine if it affects kidney function?
No. Some blood pressure medicines help protect the kidneys and heart. If your blood tests change, your healthcare professional can determine whether monitoring, a dose adjustment, or another action is needed.
Can taking several medications increase kidney risk?
Yes. Some combinations can increase the risk of kidney injury. For example, combining an ACE inhibitor or ARB, a diuretic, and an NSAID can be particularly concerning, especially during dehydration. A pharmacist or clinician can check whether your medicines are safe together.
How can I tell whether my kidneys are being affected?
You may not notice symptoms at first. Blood tests such as serum creatinine and estimated glomerular filtration rate (eGFR), along with urine tests when appropriate, help assess kidney health.
Are these medications unsafe for everyone?
No. The risk depends on the medicine, dose, duration, other medications, and individual health. Many of these medicines are necessary and can be used safely when prescribed and monitored appropriately.
Final Thoughts
Protecting your kidneys does not mean avoiding every medication that may affect them. It means understanding the risks, using the right dose, checking for interactions, and monitoring kidney function when needed.
If you take several medicines, have kidney disease, or are unsure whether an over-the-counter product is safe for you, ask your doctor or pharmacist to review your complete medication list.
Medical disclaimer: This article is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Do not stop, start, or change a prescribed medication without consulting your healthcare professional.
