Renal impairment Treatment

How Treatment Can Help Manage Kidney Function

When your kidneys begin to lose their ability to filter blood properly, the main goals of treatment focus on slowing down the damage, managing symptoms, and preventing complications that can affect your heart, bones, and overall health. Renal impairment means your kidneys aren't working as well as they should, but with the right approach, many people can maintain a good quality of life for years1.

The treatment you receive depends heavily on how advanced your kidney disease has become. Doctors measure kidney function using a blood test called estimated glomerular filtration rate (eGFR), which tells them how well your kidneys are filtering waste. A normal eGFR is above 90, while readings below 15 indicate very severe kidney damage1. Your treatment plan will also consider other factors such as your age, other health conditions like diabetes or high blood pressure, and how rapidly your kidney function is declining.

There are well-established treatments that doctors have used successfully for many years, approved by major medical organizations and based on solid evidence. At the same time, researchers around the world are testing new medications and approaches in clinical trials, searching for better ways to protect kidneys and improve outcomes for patients. Some people with early-stage disease may need only lifestyle changes and blood pressure medication, while those with more advanced kidney failure may require dialysis or transplantation2.

Standard Treatments That Protect Your Kidneys

The foundation of treating renal impairment involves controlling the underlying conditions that damage your kidneys. High blood pressure is one of the most important factors to manage. Doctors aim to keep your blood pressure below 140/90 mmHg, or even lower if you also have diabetes4. Several types of blood pressure medications are used, but certain ones offer special protection for your kidneys beyond just lowering pressure.

Angiotensin-converting enzyme inhibitors (ACE inhibitors) are medications that work by blocking a hormone system that can damage your kidneys over time. Common examples include ramipril, enalapril, and lisinopril. These medications help relax blood vessels and reduce the strain on your kidneys. If you develop a persistent dry cough from an ACE inhibitor, which is a common side effect, your doctor may switch you to a similar type of medication called an angiotensin-II receptor blocker (ARB)4. Both types of medication are particularly important if you have protein in your urine, a sign that your kidneys are being damaged.

If you have diabetes along with kidney disease, keeping your blood sugar under control is crucial. Your doctor will likely aim for a hemoglobin A1C level below 7 percent. This requires careful management of diabetes medications, which may include insulin, metformin, or newer drugs5. Controlling blood sugar helps slow the damage to the tiny blood vessels in your kidneys.

For people with diabetes or a high level of albumin (a type of protein) in their urine, doctors may prescribe SGLT2 inhibitors such as dapagliflozin. These medications were originally developed to lower blood sugar, but researchers discovered they also protect the kidneys by reducing the workload on kidney cells. They help your body get rid of excess sugar through urine. Some patients may also receive a medication called finerenone, which blocks certain hormones that can damage kidneys4.

Managing cholesterol is another important part of treatment. People with kidney disease have a higher risk of heart attacks and strokes, partly because kidney problems and heart problems often share the same causes. Statins such as atorvastatin and simvastatin are medications that lower cholesterol levels in your blood. Side effects can include headaches, upset stomach, constipation or diarrhea, and muscle or joint pain4.

As kidney disease progresses, waste products and minerals can build up in your blood. High potassium levels (hyperkalemia) can cause muscle weakness and dangerous heart rhythm problems. If diet changes aren't enough, doctors may prescribe sodium zirconium cyclosilicate, a medication that helps your body eliminate excess potassium through the digestive system. This medication is used in emergency situations or for people whose high potassium doesn't improve with other measures4.

When kidneys fail to work properly, they can't activate vitamin D, which is essential for healthy bones. They also struggle to control phosphorus levels. Many patients need to take vitamin D supplements and medications called phosphate binders, which prevent the absorption of phosphorus from food. High phosphorus can weaken bones and damage blood vessels.

Anemia, or low red blood cell count, is common in kidney disease because damaged kidneys produce less of a hormone called erythropoietin that stimulates red blood cell production. Doctors may prescribe medications that replace this hormone, along with iron supplements, to help your body make more red blood cells and reduce fatigue5.

Treatment duration varies significantly depending on your situation. If you're in the early stages of kidney disease, you may take blood pressure and cholesterol medications for the rest of your life to prevent further damage. Medications to control diabetes are also typically lifelong. Your doctor will monitor your kidney function regularly with blood tests to see how well the treatment is working and whether adjustments are needed.

For people who progress to stage 5 kidney disease, also called end-stage kidney disease, the kidneys can no longer sustain life on their own. At this point, you'll need either dialysis or a kidney transplant to survive1. Dialysis is a process that uses a machine or special fluid in your abdomen to clean your blood when your kidneys can't. There are two main types: hemodialysis, which cleans blood through a machine typically three times per week at a dialysis center or at home, and peritoneal dialysis, where fluid is placed into your abdomen to absorb waste, then drained6.

A kidney transplant involves surgically placing a healthy kidney from a deceased or living donor into your body. The new kidney takes over the work of your failed kidneys. Transplants can come from living donors (often family members or friends) or deceased donors. After a transplant, you must take immunosuppressant medications for the rest of your life to prevent your body from rejecting the new kidney6.

Promising Therapies Being Tested in Research Studies

Scientists around the world are actively searching for new ways to treat kidney disease and slow its progression. Clinical trials test experimental medications and approaches to see if they're safe and effective before they become widely available. These studies happen in phases: Phase I tests safety in a small group of people, Phase II examines whether the treatment works and continues safety testing in more people, and Phase III compares the new treatment to current standard treatments in large groups of patients.

One area of intense research focuses on medications that target inflammation and scarring in the kidneys. When kidneys are damaged by diabetes, high blood pressure, or other diseases, they develop fibrosis, which is the buildup of scar tissue that gradually destroys normal kidney function. Researchers are testing drugs that might slow or even reverse this scarring process by interfering with the cellular signals that cause fibrosis to develop.

Another promising direction involves medications that protect the kidney's filtering units, called glomeruli. Some experimental drugs work by reducing inflammation in these tiny structures or by protecting the cells that line blood vessels in the kidneys. By preserving the health of these filtering units, researchers hope to maintain kidney function for longer periods.

Newer classes of medications are being evaluated in clinical trials specifically for their kidney-protective effects. Some studies are examining whether certain anti-inflammatory drugs, immune system modulators, or medications that affect how kidneys handle salt and water can provide additional benefits beyond current treatments. These trials often measure outcomes like the rate of decline in eGFR, levels of protein in urine, and how long patients can delay the need for dialysis.

Gene therapy approaches are also being explored for certain inherited kidney diseases. These experimental treatments aim to correct genetic defects that cause progressive kidney damage. While still in early research stages, gene therapy holds potential for conditions where a single gene abnormality drives the disease process.

Researchers are also investigating whether medications that affect the gut microbiome (the community of bacteria living in your intestines) might help slow kidney disease. Some studies suggest that certain bacteria produce toxins that accumulate when kidneys fail, contributing to further damage. Experimental treatments that alter the gut bacteria or neutralize these toxins are being tested.

Clinical trials for kidney disease take place in medical centers across the United States, Europe, and many other countries worldwide. To participate, patients usually need to meet specific criteria related to their stage of kidney disease, age, and other health conditions. Your kidney doctor (nephrologist) can help you determine if there are clinical trials you might be eligible for. Participation in clinical trials is voluntary, and patients can withdraw at any time if they wish.

Most common treatment methods

• Blood pressure medications
  • ACE inhibitors like ramipril, enalapril, and lisinopril help relax blood vessels and reduce strain on kidneys4
  • Angiotensin-II receptor blockers (ARBs) provide similar kidney protection if ACE inhibitors cause troublesome side effects4
  • These medications are especially important for patients with protein in their urine
• Diabetes management medications
  • SGLT2 inhibitors such as dapagliflozin lower blood sugar and protect kidneys from damage4
  • Finerenone blocks hormones that can harm kidney tissue4
  • Insulin and metformin help control blood sugar levels to prevent further kidney damage5
• Cholesterol-lowering therapy
  • Statins like atorvastatin and simvastatin reduce cardiovascular disease risk in kidney disease patients4
  • These medications help prevent heart attacks and strokes, which are common complications of kidney disease
• Management of mineral imbalances
  • Sodium zirconium cyclosilicate treats dangerously high potassium levels4
  • Phosphate binders prevent phosphorus absorption from food to protect bones and blood vessels
  • Vitamin D supplements help maintain bone health when kidneys can't activate this vitamin
• Anemia treatment
  • Erythropoietin-stimulating medications replace the hormone kidneys normally produce to make red blood cells5
  • Iron supplements support red blood cell production and reduce fatigue
• Dialysis
  • Hemodialysis uses a machine to filter blood, typically three times per week at a dialysis center or at home6
  • Peritoneal dialysis uses fluid placed in the abdomen to absorb waste, which is then drained6
  • Required when kidneys reach end-stage failure and can no longer sustain life on their own
• Kidney transplantation
  • Involves surgically placing a healthy kidney from a living or deceased donor into the patient's body6
  • Requires lifelong immunosuppressant medications to prevent rejection of the transplanted kidney
  • Offers the potential for longer and more active life compared to dialysis
• Lifestyle modifications
  • Limiting salt intake to less than 6 grams per day helps control blood pressure4
  • Regular physical activity strengthens overall health and may slow disease progression8
  • Stopping smoking reduces further damage to blood vessels in the kidneys9
  • Managing alcohol consumption to no more than 14 units per week9