Why Does Mounjaro Cause Diarrhea?

Diarrhea is a common side effect of Mounjaro (tirzepatide), especially during dose increases. Here's why it happens and how to manage it.

The Mechanism

Why tirzepatide affects bowels: • GLP-1 effects on gut motility - Alters how food moves through intestines • GIP effects - May contribute to GI symptoms • Gallbladder effects - Changes in bile release can cause loose stools • Dietary changes - Eating differently affects digestion • Fat malabsorption - Possible in some people

When It Typically Occurs

Diarrhea patterns: • Most common during dose increases • Often improves after several weeks at stable dose • May recur when titrating up • Usually decreases over time as body adjusts

If diarrhea is severe during dose increases, discuss slower titration with your provider.

Management Strategies

To reduce diarrhea:

Stay hydrated - Replace lost fluids
Avoid fatty foods - Can worsen symptoms
Limit caffeine and alcohol
Consider BRAT diet temporarily (bananas, rice, applesauce, toast)
Probiotics may help some people
Avoid sugar alcohols (sorbitol, xylitol)

When to Contact Your Provider

Seek medical attention if: • Severe or persistent diarrhea • Signs of dehydration • Blood in stool • Fever • Unable to keep fluids down • Diarrhea prevents normal activities

Severe diarrhea can cause dangerous dehydration. Don't ignore persistent symptoms.

The Bottom Line

Diarrhea on Mounjaro results from the medication's effects on gut function. It's typically most pronounced during dose increases and often improves with time. Stay hydrated, adjust diet as needed, and contact your provider if symptoms are severe or persistent.

Sources & References

FDA - Mounjaro Prescribing Information

Why Does Mounjaro Cause Diarrhea?

The Mechanism

When It Typically Occurs

Management Strategies

When to Contact Your Provider

The Bottom Line

Sources & References

Medical Disclaimer

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