Short answer: Good news: GLP-1 medicines usually lower the amount of protein (albumin) leaking into your urine — and a falling urine-protein level is one of the most trustworthy signs that kidney disease is stabilizing. Protein in the urine (proteinuria, measured as UACR) is an important kidney marker, and reducing it is a goal of treatment. So finding protein in your urine is not a reason to avoid a GLP-1; if anything, it’s a setting where these drugs may help.
What proteinuria means. Healthy kidneys keep protein in the blood. When the kidney’s filters are under strain (from high blood pressure, diabetes, or excess weight), albumin leaks into the urine. Doctors measure this as the albumin-to-creatinine ratio (UACR). A higher UACR signals more kidney stress; a lower UACR over time signals improvement.
What GLP-1 drugs do to it.
- Semaglutide (Ozempic/Wegovy): In the large FLOW trial (type 2 diabetes + CKD), semaglutide slowed kidney-disease progression, and reductions in albuminuria were part of the picture.
- Tirzepatide (Mounjaro/Zepbound): In pooled SURPASS diabetes trials and the obesity SURMOUNT trials, tirzepatide reduced albuminuria (in SURPASS-4 the urine-albumin level was about 32% lower between groups) — these are surrogate signals, encouraging but not yet hard-outcome proof for tirzepatide.
So across the board, the direction is down, which is what you want.
Why it happens. Weight loss lowers the pressure inside the kidney’s filters (hyperfiltration), and better blood pressure and blood sugar ease the strain — all of which reduce protein leakage.
What to track with your clinician.
- UACR over time — a falling trend is the honest sign of improvement.
- Blood pressure and, if relevant, blood sugar.
- eGFR, ideally checked with cystatin C during fast weight loss (creatinine alone can mislead).
- Keep your other kidney-protective medicines (like ACE inhibitors/ARBs, and where appropriate SGLT2 inhibitors) — GLP-1 drugs add to these, not replace them.
Bottom line. Protein in your urine is an important marker, not a red flag against these drugs — GLP-1 medicines generally reduce it, and watching your UACR fall over time is one of the clearest signs your kidneys are doing better.
Full guides: Semaglutide (Ozempic/Wegovy) and Your Kidneys and Tirzepatide (Mounjaro/Zepbound) and Your Kidneys.
Related questions
Does Ozempic reduce protein in the urine? Yes — reducing albuminuria is part of semaglutide’s kidney benefit shown in the FLOW trial (in type 2 diabetes with CKD). Track your UACR to see your own trend.
Is proteinuria a reason not to take a GLP-1? No. Proteinuria signals the kidney is under strain — a setting where these drugs, alongside blood-pressure and other kidney medicines, may help. Decide with your clinician.
Which urine test shows kidney improvement? The albumin-to-creatinine ratio (UACR). A falling UACR over months is one of the most reliable signs the kidney is doing better.
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Written and medically reviewed by Dr. Amir S. Naderi, MD, FASN. Last updated: July 8, 2026. Educational information only — not medical advice. Never change or stop a prescribed medication without talking to your doctor.