Does prolonged aspirin use affect kidney function?

Does aspirin harm kidneys with long-term use?

Aspirin reduces blood flow to the kidneys by blocking prostaglandins that help maintain filtration pressure. In people with normal kidney function this effect is usually small, but chronic use can lower GFR and raise serum creatinine over months to years.

How common is kidney damage in regular aspirin users?

Studies show a 1.5- to 2-fold rise in chronic kidney disease risk among adults taking aspirin daily for more than five years. The increase is clearest in those over 60, in people with diabetes or hypertension, and in anyone who already has reduced kidney function.

What happens if someone with existing kidney disease keeps taking aspirin?

Further loss of filtration occurs faster. Dose-related declines in creatinine clearance have been documented at doses above 325 mg per day, and acute kidney injury episodes become more frequent during dehydration or concurrent illness.

Are there safer pain-relief options for people worried about their kidneys?

Acetaminophen at recommended doses does not reduce kidney blood flow the same way. Topical NSAIDs or non-drug measures such as physical therapy are also used when systemic exposure needs to be limited.

When should kidney function be checked in long-term aspirin users?

Guidelines recommend baseline serum creatinine and eGFR before starting daily aspirin, followed by repeat testing every 6–12 months or sooner if new risk factors appear.