Mounjaro diarrhea: Causes, management, and warning signs

Diarrhea is one of the most common side effects of Mounjaro (tirzepatide), with rates increasing at higher doses. Most cases are mild and improve over time, but severe symptoms require prompt medical attention. Staying hydrated is critical for preventing complications.

Mounjaro works by slowing gastric emptying and affecting the movement of food through your intestines. Diarrhea from this medication is dose-dependent (meaning it happens more often at higher doses than lower ones).

According to the drug’s prescribing information, diarrhea occurred in 12% of people taking 5-milligram (mg) doses of Mounjaro and 17% of people taking 15-mg doses.

Diarrhea occurs most often when you first start Mounjaro treatment and after your dose is increased, as your digestive system adjusts to the drug.

It might help to track when your symptoms occur in relation to receiving your doses of Mounjaro, to see if symptoms tend to clear up after a few days.

Talk with your doctor before taking any over-the-counter anti-diarrheal drugs such as loperamide (Imodium), to be sure they’re suitable for your specific situation.

Diarrhea is typically a temporary side effect of Mounjaro, but it can lead to serious complications. Get medical advice immediately if you have any of the following:

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