Does Mounjaro Cause Yeast Infections, Spotting, or Sexual Health Changes?

Mounjaro works as a dual GIP and GLP-1 receptor agonist, acting on appetite-regulating pathways and slowing stomach emptying. Its most commonly reported side effects are gastrointestinal — nausea, diarrhoea, constipation, and indigestion — as documented in the medicine's Summary of Product Characteristics (SmPC).

Yeast infections

Yeast infections are not listed among the commonly reported effects of tirzepatide. However, significant changes in diet, eating patterns, and blood glucose levels — all of which can shift during a GLP-1 journey — can sometimes influence the body's environment in ways that make individuals more susceptible to infections. If you are experiencing recurrent or persistent yeast infections, it is worth discussing this with your prescriber or doctor rather than assuming it is or isn't related to your medication.

Spotting and menstrual changes

Some people on GLP-1 medicines report unexpected spotting or changes to their menstrual cycle. Body weight changes, which are common during treatment, can affect hormonal balance and menstrual regularity. Spotting is not a listed common effect of Mounjaro, but it is the kind of change worth logging and raising with your healthcare professional, particularly if it is new, persistent, or unexpected.

Erectile dysfunction and sexual health changes

Changes in sexual function — including concerns about erectile dysfunction — are not prominently listed among Mounjaro's common effects. That said, any significant change in health, weight, energy, or mood during treatment can have downstream effects on sexual wellbeing. Some people also report improvements in energy and confidence as their journey progresses. As with any unexpected change, your prescriber or doctor is the right person to assess whether it relates to your medicine, your general health, or something else entirely.

For a broader look at how Mounjaro works in the body, including its mechanism and what to expect, that overview covers the science in more depth. You may also find it useful to read about why Mounjaro can affect the gallbladder, another less-discussed area, or explore questions around Mounjaro and cancer risk if that is something on your mind.

When something unexpected happens during your treatment, the most useful thing you can do is document it clearly so you can have an informed conversation with your prescriber or doctor. That is exactly where GLP Trackr's side-effect and symptom tracking comes in.

The app lets you log how you feel day by day — noting new or unusual symptoms, their timing, and how they change over time. Over weeks, patterns often emerge that simply aren't visible when you're trying to recall things from memory at an appointment. If you've noticed spotting that seems to coincide with dose days, or fatigue and mood shifts that came alongside other changes, having a timestamped record makes that conversation far more productive.

Alongside symptom logging, the daily check-in captures mood, energy, sleep, and overall wellbeing — giving you a fuller picture of how your body is responding at each stage of your journey. You can also use the app's doctor report feature to pull together a clean summary to share at your next appointment, so nothing gets missed.

GLP Trackr's side-effect tracking is a companion tool for your journey — it helps you notice and record, but it is not a substitute for clinical assessment. If any symptom is severe, persistent, or worrying, contact your healthcare professional promptly rather than waiting for an app pattern to confirm it. Any decision about your dose or treatment should be made with your prescriber, never on your own. You should also report any suspected side effects through your national reporting scheme (such as the UK's Yellow Card scheme) as directed by your healthcare team.

Keeping a clear log of what you experience — however unexpected — means you walk into every appointment prepared. Start your 7-day free trial of GLP Trackr on the App Store or Google Play and keep your whole journey in one place.