When you’re living with IgA nephropathy (IgAN), every lab test and doctor’s visit can bring uncertainty. You might wonder which treatments will really help protect your kidneys and what each medicine does. Among the most trusted and widely used options are angiotensin-converting enzyme (ACE) inhibitors and angiotensin-receptor blockers (ARBs).

These medications have helped countless people with kidney disease, including those with IgAN, keep their kidney function steady for many years. They work quietly but powerfully to protect your kidneys even if you feel fine or your blood pressure seems normal.

This article explains what these medications are, how they work, and what to expect while taking them, so you can feel more confident in managing your IgA nephropathy.

What Are ACE Inhibitors and Angiotensin-Receptor Blockers?

ACE inhibitors and ARBs are two types of medications that help relax blood vessels, allowing blood to flow more easily throughout the body. This action lowers blood pressure and reduces stress on the heart and kidneys.

Both types affect the same body system — the renin-angiotensin-aldosterone system (RAAS), which controls blood pressure, fluid balance, and how hard the kidneys work to filter blood.

In people with IgA nephropathy, the RAAS can become overactive. That means the kidneys experience high internal pressure, even if the person’s overall blood pressure looks normal. Over time, this can cause the glomeruli (tiny kidney filters) to stretch and leak protein.

By calming this system down, ACE inhibitors and ARBs protect the kidneys from that extra stress. Here are common examples of medications from each class.

ACE Inhibitors:

• Benazepril
• Enalapril
• Lisinopril
• Ramipril

ARBs:

• Irbesartan
• Losartan
• Olmesartan
• Valsartan

Your doctor will choose which one is right for you based on your health, side effects, and blood test results.

How ACE Inhibitors and ARBs Protect the Kidneys

IgA nephropathy causes immune proteins called IgA antibodies to build up in the kidneys. This leads to inflammation, scarring, and damage to the kidney’s delicate filters.

When those filters are injured, a protein called albumin — which should stay in the blood — can leak into the urine. This is called proteinuria. Having protein in your urine is one of the earliest and strongest signs that your kidneys are under stress. ACE inhibitors and ARBs protect the kidneys in several ways.

Reducing Pressure Inside Kidney Filters

These medications help widen (or relax) the blood vessels inside your kidneys, which allows blood to flow more easily. Lowering that internal pressure gives the tiny glomeruli a chance to work without being overstimulated. This helps reduce the wear and tear that can lead to permanent damage over time.

Reducing Protein Leakage

By easing the pressure inside the glomeruli, ACE inhibitors and ARBs make the filters less “leaky.” Less protein escapes into the urine, which means your kidneys are working more efficiently and experiencing less ongoing injury. Over time, this drop in protein levels can help preserve kidney function and slow disease progression.

Slowing Down Scarring and Inflammation

High pressure and inflammation in the kidneys can cause scar tissue to form, which slowly replaces healthy tissue. These medications calm that process by reducing inflammation signals inside the kidneys. This helps protect the kidney’s structure and maintain its ability to filter blood properly.

Supporting Long-Term Kidney Health

When kidney pressure, inflammation, and protein loss all decrease, the kidneys can maintain their function for much longer. Research shows that people taking these medications often have slower declines in kidney function and are less likely to need dialysis or a transplant later on.

Why Protein in the Urine Matters

Protein in the urine might not cause symptoms, but it’s one of the most important clues about kidney health. If protein leaks into your urine, it means your kidney filters are under pressure or damaged.

The more protein you lose in your urine, the faster your kidney function can decline. Reducing protein loss is one of the best ways to slow down disease progression.

ACE inhibitors and ARBs have been shown in clinical studies to significantly reduce protein in the urine of people with IgA nephropathy. In randomized and long-term studies, those who received ACE inhibitors or ARBs experienced significant decreases in proteinuria, though most people still had some degree of proteinuria leftover.

Doctors track this improvement using a test called the urine protein-creatinine ratio (uPCR). A lower uPCR usually means your treatment is working and your kidneys are better protected.

Who Benefits Most From ACE Inhibitors or ARBs?

Almost everyone with IgA nephropathy who has protein in their urine, high blood pressure, or signs of kidney strain can benefit from these medications.

Sometimes, even people with normal blood pressure are prescribed them because the kidney-protecting effects don’t depend only on the blood pressure control. The medication helps calm the kidneys’ internal pressure, no matter what your cuff reading says.

Common Side Effects and What To Expect

Most people tolerate ACE inhibitors and ARBs very well. But as with any medication, side effects can happen. Possible side effects include:

• A dry, persistent cough (more common with ACE inhibitors)
• Hyperkalemia (slight increases in potassium levels)
• Small rises in creatinine, a sign your doctor watches closely
• Dizziness

That cough is one reason some people switch from an ACE inhibitor to an ARB. ARBs rarely cause coughing, but they offer the same kidney protection.

If you ever experience a rare allergic reaction called angioedema (swelling of the lips, tongue, or face), contact your doctor right away, as it can be a life-threatening adverse effect.

The Importance of Regular Monitoring

ACE inhibitors and ARBs affect kidney function and electrolytes, so regular lab work is a must. Your doctor will most likely check:

• Creatinine — To see how well your kidneys are filtering
• Potassium — To see if your levels rose, which can happen with these medications
• Urine protein — To measure progress
• Blood pressure — To make sure it’s not dropping too low

A small increase in creatinine or potassium is normal at first, and it means the medication is lowering kidney pressure. But if the numbers rise too high, your doctor may adjust your dose or suggest more frequent monitoring.

When Doctors May Switch or Adjust Medications

Sometimes, your treatment plan may change. If you develop a cough, high potassium, or other side effects, your doctor may switch you from an ACE inhibitor to an ARB.

These changes are normal parts of managing a long-term condition like IgA nephropathy. The goal is to keep treatment effective and safe while maintaining your quality of life.

When ACE Inhibitors and ARBs Aren’t Enough

ACE inhibitors and ARBs are important medications for protecting the kidneys, but sometimes they aren’t enough on their own. Even when people take the highest safe doses, some continue to have protein in their urine or slowly lose kidney function over time.

This can happen because the body finds other ways to raise blood pressure inside the kidneys or increase inflammation, even while on treatment. When that happens, doctors may recommend adding another medication to help reduce protein in the urine and better protect the kidneys.

These newer medications don’t replace ACE inhibitors or ARBs, but instead work alongside them to give your kidneys more support and help reduce further damage.

Moving Forward With Confidence

ACE inhibitors and ARBs are cornerstone treatments for IgA nephropathy. They:

• Relax blood vessels and improve circulation
• Lower pressure inside the kidneys
• Reduce protein loss in urine
• Slow scarring and preserve kidney function

Staying on track with treatment — taking your medication as prescribed, keeping up with lab tests, and talking openly with your care team — about any new symptoms can help you protect your kidneys for the long term.

Join the Conversation

On myIgANteam, people share their experiences with IgA nephropathy, get advice, and find support from others who understand.

Have you tried an ACE inhibitor or ARB to help manage your IgAN? Let others know in the comments below.