What you need to know
- Diabetes and high blood pressure are the two biggest drivers of chronic kidney disease (CKD). Keeping both well controlled is the single most important thing anyone can do to slow progression.
- Two medication classes — ACE inhibitors or ARBs, and SGLT2 inhibitors — have become cornerstones of kidney protection. They are now used in many people with CKD, including those without diabetes.
- Several common medications need dose adjustments or should be avoided entirely in CKD. NSAIDs (ibuprofen, naproxen) are the most important to know about, and they are sold over the counter, so it is easy to take them by accident.
More than 1 in 7 US adults — about 37 million people — may have chronic kidney disease, and many of them do not know it. CKD is usually silent in the early stages, often picked up only because a routine blood or urine test flags it. The good news is that early CKD is highly modifiable. The medications and lifestyle steps that protect kidney function are well established, and progressing slowly enough to never reach kidney failure is a realistic goal for most people who catch it early.
Because diabetes and high blood pressure cause the great majority of cases, the foundation of CKD management overlaps heavily with the management of those two conditions. If you are working through how to manage high blood pressure or getting on top of type 2 diabetes, you are already doing most of what protects your kidneys.
The medications and lifestyle steps that protect kidney function are well established, and progressing slowly enough to never reach kidney failure is a realistic goal for most people who catch it early.
What CKD actually is
The kidneys filter waste and excess fluid from the blood, balance electrolytes, and help control blood pressure and red blood cell production. CKD is a gradual, long-term decline in how well they do that. Diabetes is the leading cause, and high blood pressure is second. Other causes include glomerulonephritis, polycystic kidney disease, recurrent kidney infections, and prolonged use of certain medications.
Doctors stage CKD based on a calculation called the estimated glomerular filtration rate (eGFR), which is derived from a routine blood test. Stage 1 means kidney damage with normal eGFR; Stage 5 is kidney failure (eGFR below 15), where dialysis or transplant becomes necessary. Most people diagnosed with CKD are at Stages 1 to 3 — well-functioning enough to live normally, but worth treating proactively.
Symptoms tend to come late. Early CKD often produces no symptoms at all. As it advances, signs can include swelling in the feet or hands, foamy urine, persistent fatigue, itching, loss of appetite, and trouble sleeping. By the time these appear, kidney function is usually already substantially reduced.
The medications that protect kidney function
Two classes of medication have changed the outlook in CKD over the past decade.
ACE inhibitors and ARBs
Drugs like lisinopril, enalapril, ramipril (ACE inhibitors), and losartan, valsartan, and irbesartan (ARBs) lower blood pressure, but their bigger role in CKD is reducing the pressure inside the kidney’s tiny filtering units. Both have been shown to slow kidney damage in people with diabetes and high blood pressure, particularly when there is protein leaking into the urine. Most people with CKD end up on one of these unless there is a specific reason not to.
SGLT2 inhibitors
Drugs like dapagliflozin (Farxiga), empagliflozin (Jardiance), and canagliflozin (Invokana) were originally approved for type 2 diabetes. More recently, multiple large trials have shown they slow CKD progression even in people who do not have diabetes. They are now part of the recommended regimen for many CKD patients with proteinuria, with or without diabetes, often added on top of an ACE inhibitor or ARB.
Statins are commonly added in CKD too — not for the kidneys directly, but because cardiovascular disease is the leading cause of death in people with CKD, and statins reduce that risk. For people aged 50 and over with CKD, statin therapy is generally recommended.
Other newer options include GLP-1 receptor agonists (semaglutide, liraglutide) and finerenone — a non-steroidal mineralocorticoid receptor antagonist — both of which reduce kidney and cardiovascular risk in people with diabetic kidney disease. These are typically added by a specialist in higher-risk cases.
Two medication classes — ACE inhibitors or ARBs, and SGLT2 inhibitors — have become cornerstones of kidney protection.
Medications to avoid or adjust in CKD
This is the part of CKD management most often overlooked, because it usually involves medications you might pick up at the pharmacy without thinking.
NSAIDs (ibuprofen, naproxen, diclofenac, ketorolac). These reduce blood flow to the kidneys and can cause sudden kidney injury, particularly when eGFR is below 60. Even short courses can be a problem. For most pain that you would otherwise treat with ibuprofen, acetaminophen (Tylenol) is the safer choice in CKD. Always check labels — many cold and flu products contain hidden NSAIDs.
Bowel preparations for colonoscopy. Some phosphate-based preps can cause kidney injury in people with CKD. Polyethylene glycol (PEG)-based preps are usually preferred. Tell the gastroenterologist about your kidney function before any procedure.
Antibiotics and antivirals. Many — including some commonly used antibiotics like trimethoprim-sulfamethoxazole, certain antivirals, and aminoglycosides — need dose adjustment or avoidance based on eGFR. Your prescriber and pharmacist coordinate this when they know about the CKD.
Metformin. This first-line diabetes medication is fine at higher eGFR levels but needs dose reduction below 45 and is usually stopped below 30. The boundaries shift over time as guidelines update — your diabetes provider should be reviewing this with you.
IV contrast for imaging. The risk of contrast-related kidney injury has been re-evaluated downward in recent years and is no longer as restrictive as it once was, but it still warrants a balanced conversation about whether the scan is worth it and whether alternatives like ultrasound or MRI without contrast would answer the same question.
Lithium (used for bipolar disorder) and certain other psychiatric medications need careful kidney monitoring with long-term use.
Sick day rules
One important practical detail: during acute illness with vomiting, diarrhea, or significant dehydration, several medications used in CKD should be temporarily paused. ACE inhibitors, ARBs, SGLT2 inhibitors, diuretics, and metformin are usually held during these episodes and restarted when you are eating, drinking, and feeling better. Ask your prescriber for a written plan ahead of time so you know what to do — this is one of the highest-leverage pieces of CKD self-management.
Lifestyle protection that really moves the needle
The medications above work best alongside the basics that drive both diabetes and blood pressure control.
- Get blood pressure into target range — usually below 130/80 for people with CKD, with home monitoring to confirm.
- Manage blood sugar if you have diabetes — A1C goal individualized but often around 7%.
- Limit sodium to no more than 2,300 mg per day, less if your provider recommends.
- Stop smoking — it accelerates kidney damage and dramatically raises cardiovascular risk.
- Stay physically active — regular activity improves blood pressure, blood sugar, and cardiovascular health all at once.
- Be cautious with high-protein diets and supplements — particularly creatine and very high-protein eating patterns. Discuss with your provider before starting.
When to see a doctor
If you have diabetes, high blood pressure, heart disease, or a family history of kidney failure, ask your provider about kidney testing — a simple blood test (eGFR) and urine test (urine albumin-to-creatinine ratio) is usually all that is needed to screen. Once CKD is identified, follow-up frequency depends on the stage, but at least once a year is typical for early disease.
A referral to a kidney specialist (nephrologist) is generally recommended when eGFR drops below 30, when proteinuria is heavy, when there is rapid decline in kidney function, or when the cause of CKD is unclear. Earlier referral does not mean worse disease — it usually means more options for slowing things down.
Frequently asked questions
Should I avoid all painkillers if I have CKD?
Not all — but most over-the-counter NSAIDs (ibuprofen, naproxen, aspirin in pain doses) are best avoided. Acetaminophen at standard doses is generally safe in CKD and is the preferred over-the-counter option for routine pain. For more significant pain, your provider can choose options that are friendlier to the kidneys. Always check the label of cold and flu combination products, because many of them contain ibuprofen or naproxen.
Can my kidney function ever improve, or only get worse?
Kidney function lost from long-standing damage usually does not come back. But CKD progression can often be slowed dramatically — and in some cases, particularly with aggressive blood pressure and blood sugar control plus the right medications, eGFR can stabilize for many years. Acute kidney injury (a sudden drop, usually from illness, dehydration, or a medication) can recover, sometimes fully. The combination matters: long-term decline plus episodes of acute injury accelerate the timeline, so avoiding kidney insults is just as important as taking the protective medications.
Why is my doctor changing my medications even though I feel fine?
Because CKD is largely silent until it is advanced. Your kidneys can lose a substantial portion of their function before you feel anything different, which is why doctors treat the numbers (eGFR, urine protein, blood pressure, blood sugar) rather than waiting for symptoms. Adding an SGLT2 inhibitor or adjusting a blood pressure medication when you feel fine is exactly the point — it works best when there is still kidney function to protect.
