Kidney stone risk on GLP-1 — 6 month update

Answering the narrow version, because the broad one does not have a single answer. FLOW is the relevant trial and it reported a meaningful reduction in kidney-disease progression and related death in people with type 2 diabetes and chronic kidney disease. The mechanism looks to be a mixture of reduced albuminuria, better glycaemia and blood pressure, and a probable direct anti-inflammatory effect on the glomerulus. Separately, eGFR is genuinely noisy during rapid weight loss — a small early dip is common and usually haemodynamic rather than damage.

Correct me if the detail matters more than I have assumed.

Dr.ObesityLA said:

FLOW is the relevant trial and it reported a meaningful reduction in kidney-disease progression and related death in people with type 2 diabetes and…

Agreed, and the practical implication is not to over-read a single eGFR during a period of rapid loss and altered hydration. Trend, with UACR beside it.

steve_okc said:

I spent a month blaming the drug for headaches and light-headedness that turned out to be salt and water, which is embarrassing and apparently common.

Can confirm. Same sequence, different timescale. Posting only so the count is not one.

Clinical perspective, offered as context rather than as advice.

Muscle cramps on hydration — anyone else? I was getting severe leg cramps at night, especially calves. Bloodwork showed my magnesium was low.

GLP-1 agonists can cause electrolyte shifts due to reduced food intake and GI effects. Get your electrolytes checked and supplement accordingly. I take magnesium glycinate 400mg + potassium gluconate 99mg daily and cramps are gone.