Quick Answer
Early kidney test dip on Ozempic? New FLOW analysis says it does not prove harm. Do not stop the drug; keep your kidney tests on schedule.
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Should you stop Ozempic if your kidney test dips in the first few weeks? No. A new analysis of the FLOW trial, presented at the American Society of Nephrology Kidney Week 2026, found that a bigger early drop in kidney function was linked to higher predicted kidney risk, but the researchers say this does not prove semaglutide harms the kidneys. The advice is to keep taking the medicine and keep your blood tests on schedule.
What Happened
FLOW was a large trial of adults with type 2 diabetes and chronic kidney disease. The new analysis looked at 1,767 people on semaglutide and 1,766 on placebo. On average, kidney function (eGFR) fell by about 1.09 in the semaglutide group and 1.05 in the placebo group by week 12, which is almost the same. The team then used each person early change to predict who would have serious kidney events by week 104, such as dialysis, transplant, a lasting fall in kidney function, or death from kidney or heart causes.
In both groups, people whose kidney function dropped more in the first 12 weeks had a higher predicted risk. That link stayed even after the researchers accounted for protein in the urine. The original FLOW results are unchanged: semaglutide lowered major kidney disease events by 24 percent and death from any cause by 20 percent.
What This Does Not Mean
This was a post hoc analysis, which means it was not the main question the trial was designed to answer. Such analyses can be biased, because people whose kidney function drops early may differ from others in other ways. The researchers stress that the finding does not show semaglutide caused kidney injury. The trial was also funded by Novo Nordisk, the maker of Ozempic. The news summary did not report absolute event numbers or side effects, so it is best seen as a signal for doctors to watch, not a reason for patients to panic.
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Why It Matters for Indian Patients
India has one of the largest numbers of people with diabetes in the world, and many of them also have kidney problems that go unnoticed. With generic semaglutide now widely available and cheaper, more Indians are starting these injections, often through quick online or pharmacy routes with little follow-up. The lesson from this study is that kidney tests are not optional. A baseline creatinine and eGFR test, and a urine albumin test, should be done before you start, and repeated a few weeks after starting and after every dose increase.
People with diabetes, high blood pressure, a long history of painkiller use, or known kidney disease need the most careful monitoring. Dehydration from vomiting or diarrhoea, which are common GLP-1 side effects, can also lower kidney function temporarily, so drinking enough fluids matters.
What To Do Next
If you already take Ozempic, Wegovy, Rybelsus or a similar medicine, do not stop it on your own. Ask your doctor for a kidney function test if you have not had one in the last three to six months. Tell your doctor about any other medicines you take, especially painkillers, water pills, or blood pressure tablets. Seek help quickly if you have severe vomiting, very little urine, swelling in your legs, or unusual tiredness.
If you are thinking of starting a GLP-1 medicine, get your kidney tests done first and start with the lowest dose under medical supervision. For most people with diabetes and kidney disease, the overall evidence still points to kidney protection, not harm.
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Disclaimer: This article is based on information published on the referenced websites below and is intended for general awareness only. It is not a substitute for professional medical advice.
References: 1. Medical Daily — https://www.medicaldaily.com/semaglutide-early-kidney-function-decline-flow-analysis-480935 2. Endocrinology Advisor — https://www.endocrinologyadvisor.com/news/semaglutide-kidney-protection-type-2-diabetes/
MySurgery GLP-1 Team
GLP-1 Research & Patient Education
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