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Effects of Mounjaro therapy is best assessed over the long term. Already in the first few weeks, many patients notice a reduction in appetite and better control over eating. Gradual weight loss occurs over the following weeks, making the results of the therapy sustainable and safe.
How does the drug Mounjaro work?
After the start treatments effects are not always immediately apparent. In the first few weeks, they usually relate to a reduction in feelings of hunger and a reduction in emotional eating.
Prior to treatment, difficulties with hunger control and emotional eating are common. Once treatment is implemented, many people develop greater stability in their feelings of hunger and less pressure to eat.
Mounjaro affects the central nervous system, The result is that the feeling of satiety appears quicker and lasts longer. As a result, calorie intake is reduced without the need for restrictive diets.
Weight loss with Mounjaro - before and after effects
Clinical studies show that the therapy can lead to an average weight reduction of 15-22% over a longer period of time. The rate of change depends on the dose, diet and level of physical activity.
Weight reduction mainly concerns adipose tissue, including visceral fat, excess of which is associated with an increased risk of metabolic diseases.
First weeks of application
- 1-2 weeks: adaptation of the body, reduced appetite, no marked change in weight
- 1 month: improved appetite control, reduction of approx. 1-2 kg
- 5-8 weeks: more noticeable effects, a drop of approx. 3-4 kg
- 9-12 weeks: consolidation of changes, a drop of approx. 5-6 kg

Long-term effects
After approximately 24 weeks of use, patients achieve weight loss of 12-15%. After approximately 72 weeks reduction is approximately 15-22%.
In addition to weight loss, improvements in blood glucose levels and metabolic parameters are observed.
Summary
The therapy works gradually, affecting appetite and metabolism. The first effects usually appear within a few weeks and the effectiveness depends on lifestyle and the individual's response.
Want to know more about Mounjaro therapy at Wellclinic? Consult with our medical staff, who tailor the therapy to your needs.
FAQ - Mounjaro effects before and after
When do the first effects appear?
Most often within 1-2 weeks (reduction in appetite).
Does it reduce cravings immediately?
In some people yes, in others gradually.
When do you see weight loss?
Usually after 3-4 weeks.
How much weight can you lose after one month?
On average 1-2 kg.
Is it necessary to follow a diet?
No, but it increases the effects.
Are the effects sustainable?
They depend on maintaining healthy habits.
Does it work without physical activity?
Yes, but movement significantly improves results.
Sources:
1. FDA (U.S. Food and Drug Administration)
https://www.fda.gov/
2. the EMA (European Medicines Agency)
https://www.ema.europa.eu/
https://www.ema.europa.eu/en/medicines/human/EPAR/mounjaro
3. Mounjaro for Weight Loss
https://www.healthline.com/health/drugs/mounjaro-for-weight-loss
Katarzyna Pawłowska
07.05.2026
+48 123 456 789