Why do I have diarrhea on a GLP-1?
The short answer: Diarrhea is a common early GLP-1 side effect that usually settles as your body adjusts to a dose. This is a common GLP-1 side effect.
Why it happens
GLP-1s change how your gut moves and how it handles fats, which can loosen stools — especially early on and after a dose increase. Rich, fatty, or greasy meals are frequent triggers.
How long it lasts
It's typically worst early and after dose changes, and improves within a week or two as you adjust. Persistent diarrhea deserves a check-in with your prescriber.
What helps
- Avoid fried, greasy, and very fatty foods while it's active
- Stay hydrated — replace fluids and electrolytes
- Eat smaller, plainer meals for a few days
- Limit caffeine and alcohol, which can make it worse
When to call your doctor
- Diarrhea that won't stop, or signs of dehydration (dizziness, very dark urine)
- Blood in the stool, or severe abdominal pain
Track this against your dose. Logging diarrhea week by week shows whether it's actually easing — and gives your prescriber real data.
Related symptoms
Educational information from Calqulate.net — not medical advice, diagnosis, or treatment. Follow your prescriber's instructions and contact a licensed clinician about your symptoms.
