Dehydration
The quiet risk of appetite-suppressed eating and GI symptoms — and the mechanism behind GLP-1 kidney warnings.
GLP-1 therapy suppresses thirst-by-habit along with hunger: most fluid intake rides on meals and routine, and both shrink. Add a vomiting or diarrhea spell and losses compound — which is exactly the pathway behind the kidney-injury cases in prescribing information: not direct toxicity, but kidneys starved of volume.
Prevention is deliberate drinking — a bottle tracked through the day, fluids prioritized during any GI flare, electrolytes when losses are real. Dark urine, dizziness on standing, headache, and fatigue are the early signature. It's the most preventable serious-adjacent risk in the whole category, which makes "carry water" the least glamorous and most useful advice on this page.
This glossary entry is general information, not medical advice, and is written to be consistent with FDA prescribing information and primary trial publications as of its last review. Always consult a licensed healthcare provider for personal medical decisions.
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