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GLP-1 Decoder

Mounjaro and Probiotics: Is It Safe? Label, Studies

No interaction is listed; probiotics have a long record of safe use in healthy people.

Verdict
Together, this is generally okay
Label names it
No

Check a GLP-1 interaction

Mounjaro key facts

How long it remains in your body
100%50%25%0%05 d10 d15 d20 d25 d50%25%12.5%time after the dose

Its half-life is about 5 days. At 5 d, half is gone, and five half-lives (25 d) leave about 3% behind.

Weight loss in its main trial
Mounjaro (SURPASS-1)7.8 kgPlacebo1 kg

In the SURPASS-1 trial of type 2 diabetes over 40 weeks, 7.8 kg was lost compared with 1 kg on placebo.

Prices over time
2026$1,112.16$0List priceSelf-pay

Monthly prices in US dollars include the list price and self-pay offers. Each comes from the maker's price page.

Sources: FDA label (DailyMed), healthsystemtracker.org, pricinginfo.lilly.com.

Mounjaro and probiotics: the verdict

Together, this is generally okay

The Mounjaro label does not list any interaction with probiotics. The NIH says probiotics are generally safe for people who are healthy, but a weak immune system puts you at higher risk.

What the Mounjaro label says

No line on probiotics. The main warning for anything you drink is kidney injury caused by fluid loss. Vomiting or diarrhea can cause fluid loss, which can lead to kidney injury. If you have heavy fluid loss, report it and drink fluids.

Source: FDA label on DailyMed.

What the studies show

Sources: FDA label (DailyMed), nccih.nih.gov.

What to do in practice

Ask your doctor first if you are seriously ill or have a weak immune system.

Source: FDA label on DailyMed.

Probiotics with other GLP-1s

Probiotics are not mentioned in the drug interaction section of any of the 10 GLP-1 labels, so the answer applies to the entire class.

That question also applies to Ozempic, Wegovy, Zepbound.