Diarrhea on a GLP-1: What Helps and When to Call
Diarrhea is one of the more common digestive side effects listed on GLP-1 and tirzepatide labels. It tends to show up after a dose increase or after a greasy meal, and for many people it settles as the body adjusts. In Zepbound's weight-loss trials, 19% to 23% of adults reported diarrhea, compared with 8% on placebo.
Why It Happens
These medications change how quickly food moves through your stomach and gut. Smaller appetite also means you may eat differently than you used to, and rich or fatty foods can hit harder. Everyone responds differently, and this page is general information, not a diagnosis.
Practical Strategies
- Keep meals small and plain for a few days. Rice, bananas, toast, eggs, and broth are easy to tolerate.
- Go easy on greasy, fried, and very sugary food, which many people find triggers symptoms.
- Sip fluids through the day and replace what you lose. Dehydration is the real risk with loose stools.
- Note the timing. If it follows a dose increase, tell your prescriber so they can decide if a change is needed.
- Avoid sugar alcohols (found in many protein bars and "sugar-free" foods), which can loosen stools on their own.
- Check your fiber and magnesium supplements, since too much can contribute.
Products That May Help
Affiliate disclosure →These are specific products we recommend based on evidence and community feedback. Links are affiliate links — we may earn a commission at no extra cost to you.
Questions to Ask Your Clinician
Bring these to your next appointment. Your prescriber is your best resource for decisions specific to your situation.
- “Could my dose or timing of increase be contributing to this?”
- “How many days of diarrhea should prompt me to call you?”
- “Are any of my supplements or medications making it worse?”
- “Is it safe for me to use an over-the-counter anti-diarrheal?”
Sources
Percentages come from clinical trials of one medication and are not a prediction for you. Your experience may differ.
Want to understand your medication?
Compare Ozempic, Wegovy, Mounjaro & Zepbound — active ingredients, approved uses, and trial data.
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