Diarrhea

On Ozempic, Wegovy, Mounjaro & Zepbound

When it happens

Can occur any time in the dose cycle, but often appears in the first 2–3 days post-injection

Typical peak window

Day 1–4 after injection

How long it lasts

Often improves within the first 8–12 weeks as gut motility adjusts. May flare briefly with each dose increase.

What helps

•Stay well-hydrated — diarrhea is the fastest path to dehydration on GLP-1s
•BRAT diet (bananas, rice, applesauce, toast) on bad days
•Avoid high-fiber foods, dairy, and artificial sweeteners during flare-ups
•Over-the-counter loperamide (Imodium) is generally safe and effective for acute episodes
•Probiotics may help some people — discuss with your provider

By medication

Mounjaro / Zepbound (tirzepatide)

Diarrhea rates may be slightly lower on tirzepatide than semaglutide, though both GIP and GLP-1 receptor activity can affect GI motility.

Dose context

Roughly 30% of GLP-1 users experience diarrhea. It tends to be milder and more transient than nausea for most people.

When to contact your provider

If diarrhea is severe, lasts more than 48 hours, or involves blood. Watch for signs of dehydration: dizziness, dark urine, rapid heartbeat.

Understand your dose cycle

Your drug level right now explains a lot about how you feel. See exactly where you are in your cycle.

Information is evidence-informed and based on published clinical data. Not medical advice — always discuss symptoms with your healthcare provider.