What NSAIDs are
NSAIDs (Non-Steroidal Anti-Inflammatory Drugs) are commonly used pain and inflammation medications. They are available over the counter and by prescription. Common examples:
- Ibuprofen (Advil, Motrin)
- Naproxen (Aleve, Naprosyn)
- Diclofenac (Voltaren, Cambia)
- Ketorolac (Toradol)
- Meloxicam (Mobic)
- Indomethacin (Indocin)
- Celecoxib (Celebrex) — a COX-2 selective NSAID, somewhat lower risk but still not kidney-safe in vulnerable patients
How NSAIDs hurt the kidneys
NSAIDs work by blocking enzymes called cyclooxygenase (COX-1 and COX-2) that produce prostaglandins. In healthy adults, kidney prostaglandins are not particularly important. But in vulnerable patients, prostaglandins maintain blood flow to the kidneys; blocking them constricts the kidney's blood supply and can cause acute kidney injury.
Four main types of kidney injury can result:
- Acute kidney injury from reduced blood flow (most common)
- Acute interstitial nephritis — an immune-mediated inflammation
- Sodium and water retention — worsening blood pressure and edema
- Chronic interstitial nephritis — with prolonged use over years (analgesic nephropathy)
Who is at highest risk
- Patients with chronic kidney disease (any stage)
- Older adults (age 65+)
- Patients with heart failure
- Patients with cirrhosis
- Patients on ACE inhibitors, ARBs, or diuretics (the 'triple whammy' is particularly risky)
- Patients who are dehydrated, vomiting, or with severe diarrhea
- Patients receiving contrast dye for imaging
In these patients, even a few days of NSAID use can trigger meaningful kidney injury.
Safer alternatives for pain
- Acetaminophen (Tylenol) is generally the preferred over-the-counter option for pain in patients with kidney disease, taken at recommended doses (usually no more than 3,000 mg/day in CKD patients)
- Topical NSAIDs (diclofenac gel) deliver less drug systemically and may be safer for localized joint pain
- Heat, ice, physical therapy, and topical agents can address many sources of musculoskeletal pain
- Targeted interventional pain procedures (epidural injections, joint injections) for chronic pain
For patients with chronic pain who require ongoing analgesia, a pain management specialist can develop a plan that minimizes NSAID exposure.
What to do if you have CKD
- Avoid all NSAIDs unless your nephrologist specifically clears their use
- Read OTC labels — NSAIDs are in many cold and flu products
- Tell every provider, including dentists and surgeons, that you have CKD
- If you accidentally take an NSAID, increase fluids and let your nephrologist know