Average Weight Loss on Mounjaro: What the Evidence Suggests

In clinical trial programmes for tirzepatide, participants at higher dose levels lost a substantial proportion of their body weight over roughly 72 weeks — figures often cited in medical literature range from around 15% to over 20% of body weight at the highest doses, though these were in specific trial populations and under controlled conditions. Real-world results vary more widely.

Week-by-week and first-month expectations

Early weeks tend to show more modest changes. Many people notice the scale moving within the first few weeks, though some find little change in week one while their body adjusts to the starting dose. Average weight loss in week one on Mounjaro is often small — sometimes under a kilogram — and the first month typically reflects the low starting dose rather than the full effect of the medicine. Consistent, gradual progress over months is the more meaningful pattern to watch.

How does Mounjaro compare to Wegovy?

Wegovy (semaglutide) also supports meaningful weight loss in clinical trials — average weight loss on Wegovy in trial data is commonly reported at around 15% of body weight over approximately 68 weeks at the maintenance dose. Both medicines act on GLP-1 pathways; tirzepatide additionally acts on GIP receptors, which is reflected in some of the differences seen in trial data. Whether one is appropriate for any individual is a decision for their prescriber, not a comparison table.

Why averages can mislead

Averages smooth over a huge range of individual responses. Some people lose weight more quickly; others progress more slowly and still see excellent long-term results. Plateaus are a normal part of the journey — if you want to understand what is and is not working in your own pattern, read more in our guide to what to do when weight loss stalls on Mounjaro. For broader context on what a sustainable rate looks like, healthy weight loss per week is worth understanding alongside any medicine-specific figure. You can also explore average weight loss on keto in a month if you are considering dietary approaches alongside your treatment.

The most useful number is not the population average — it is your own trend over time. GLP Trackr's weight and body tracking feature lets you log your weight as often as you like and turns those entries into a clear chart, so you can see your actual trajectory rather than guessing. Week-by-week progress views help put short-term fluctuations in context, and the plateau forecast within the app's insights tools can flag when a pattern in your data is worth discussing with your prescriber.

Beyond the scale, the daily check-in captures mood, energy, sleep, and food noise — factors that often shift well before the number on the scale does, and that paint a fuller picture of how the medicine is working for you. This kind of joined-up data is also useful to bring to appointments: seeing your weight trend alongside how you have been feeling gives your prescriber much more to work with.

For practical tips on supporting your results through food choices, explore ways to support weight loss on Wegovy — many of the principles apply across GLP-1 medicines. And for a broader overview of tracking your results throughout your treatment, visit our weight loss tracking guide.

GLP Trackr is a tracking and journaling app — it does not replace the guidance of your prescriber or doctor. If you have concerns about your progress, your dose, or any symptoms you are experiencing, always raise them with your healthcare professional, who knows your full history.

Want to see your own trend take shape? Download GLP Trackr on the App Store or Google Play and start your free 7-day trial — your weight chart is waiting.