“Doctor, how many kilos will I lose in the first month?” This is probably the most common question patients ask on their very first visit for Mounjaro. Social media is full of before and after photos showing 10 kg gone in a few weeks, so it is natural to expect quick results.
The honest answer is that Mounjaro does work very well, but the weight comes off gradually. The first month is mostly about getting your body used to the medicine, the real change usually starts showing by the second and third month, and the biggest results come between 6 and 18 months.
In this article we will explain how much weight you can realistically lose on Mounjaro (tirzepatide) in 1 month, 3 months, 6 months and beyond, based on clinical trial data and what we commonly see in practice, along with tips to get the best results.
Quick Answer
- In 1 month: Most people lose around 2% to 4% of their body weight, which is roughly 2 to 4 kg for someone weighing 100 kg. Part of this early loss is water weight.
- In 3 months: Most people lose around 5% to 8% of their body weight, roughly 5 to 8 kg for a 100 kg person.
- In 6 months: Weight loss of 10% to 14% is common as the dose increases.
- In about 1.5 years (72 weeks): Average weight loss in the main clinical trial was 15% to 21% of body weight, depending on the dose.
These are averages. Your own result depends on your starting weight, dose, diet, activity, sleep and medical conditions like diabetes, thyroid or PCOS.
Why Mounjaro Weight Loss Is Slow in the First Month
Mounjaro is always started at a low dose of 2.5 mg once a week for the first 4 weeks. This starting dose is mainly meant to let your stomach adjust and reduce side effects like nausea and vomiting. It is not the dose where maximum weight loss happens.
The main SURMOUNT-1 trial, which tested tirzepatide in over 2,500 adults with obesity, did not report a single official figure for week 4. The weight curve starts moving down in the first month, but the bigger drop comes later as the dose goes up to 5 mg, 7.5 mg, 10 mg and higher.
So if you have lost only 2 or 3 kg in your first month, please do not feel disappointed. That is a normal and healthy start. You can read more about how the medicine works in our guide on Mounjaro weight loss treatment in Delhi.
How Much Weight Can You Lose on Mounjaro in 1 Month?
In the first 4 weeks on 2.5 mg, most patients notice that their appetite comes down, portions become smaller and cravings for sweets and fried snacks reduce. On the weighing scale, a loss of around 2 to 4 kg is common for people starting at 90 to 110 kg.
A few things to keep in mind about month one:
- Some of the early loss is water and reduced stomach contents, not only fat.
- People with a higher starting weight usually see bigger numbers on the scale.
- Some people lose very little in the first month and then pick up speed later. This is completely normal.
- Losing more than 1 kg per week consistently is not always better. If it comes with poor eating and weakness, it may mean muscle loss.
How Much Weight Can You Lose on Mounjaro in 3 Months?
By the end of 3 months, most patients are on 5 mg or 7.5 mg, and this is where the results become clearly visible. Clothes start fitting loosely and people around you begin to notice.
On average, a loss of around 5% to 8% of body weight by 3 months is a realistic target, which means:
- About 5 to 7 kg if you started at 90 kg
- About 5 to 8 kg if you started at 100 kg
- About 6 to 9.5 kg if you started at 120 kg
An analysis of SURMOUNT-1 looked at people who lost 5% or more of their weight by week 12 (called “early responders”) and those who lost less (“late responders”). Even among the late responders, about 70% had crossed 5% weight loss by week 24. In simple words, if your weight loss is slow in the first 3 months, it does not mean Mounjaro is not working for you.
Mounjaro Weight Loss Timeline: Month by Month
| Time on Mounjaro | Usual Dose | Average Weight Loss | What You May Notice |
| Month 1 | 2.5 mg | 2% to 4% | Less hunger, smaller portions, mild nausea in some people |
| Month 2 | 5 mg | 3% to 6% (total) | Steady loss, fewer cravings, clothes feel slightly loose |
| Month 3 | 5 mg to 7.5 mg | 5% to 8% (total) | Visible change in face and waist, better sugar levels |
| Month 6 | 7.5 mg to 10 mg | 10% to 14% (total) | Major change, improved BP and energy |
| Month 12 to 18 | Maintenance dose | 15% to 21% (total) | Close to maximum results, weight starts to stabilise |
In SURMOUNT-1, weight loss was fastest in the first 24 weeks (about 6 months), when participants lost around 13% to 14% of their body weight on average. After that, the loss continued at a slower pace and most people reached a plateau later in the trial.
Expected Weight Loss on Mounjaro by Starting Weight
This table gives a rough idea based on average results. Your doctor can give you a more personal estimate.
| Starting Weight | 1 Month | 3 Months | 6 Months | 72 Weeks |
| 80 kg | 1.5 to 3 kg | 4 to 6.5 kg | 8 to 11 kg | 12 to 17 kg |
| 90 kg | 2 to 3.5 kg | 4.5 to 7 kg | 9 to 12.5 kg | 13.5 to 19 kg |
| 100 kg | 2 to 4 kg | 5 to 8 kg | 10 to 14 kg | 15 to 21 kg |
| 110 kg | 2 to 4.5 kg | 5.5 to 9 kg | 11 to 15 kg | 16.5 to 23 kg |
| 120 kg | 2.5 to 5 kg | 6 to 9.5 kg | 12 to 17 kg | 18 to 25 kg |
These figures are approximate averages for guidance only, not a guarantee. Some people lose more and some lose less.
What the Clinical Trials Show
Here is what the major tirzepatide trials found:
- SURMOUNT-1 (72 weeks, adults with obesity, no diabetes): Average weight loss was 15% on 5 mg, 19.5% on 10 mg and 20.9% on 15 mg, compared with 3.1% on placebo. More than one third of people on the highest dose lost 25% or more of their body weight.
- SURMOUNT-CN (52 weeks, Chinese adults): Average weight loss was 13.6% on 10 mg and 17.5% on 15 mg.
- SURMOUNT-J (72 weeks, Japanese adults): Tirzepatide again gave large weight reductions compared with placebo.
The Asian trials are useful for Indian patients because they show that tirzepatide works well in Asian bodies too, which tend to carry more fat around the belly even at a lower BMI.
Why Some People Lose Weight Faster Than Others
Two people taking the same dose can get very different results. The main reasons are:
- Starting weight: The heavier you are, the more kilos you usually lose in the beginning.
- Dose: Higher maintenance doses (10 mg and 15 mg) generally give more weight loss than 5 mg.
- Diabetes: People with type 2 diabetes often lose a little less weight than those without diabetes.
- Diet quality: Eating less is not enough. Too much maida, sugar, fried food and sweet drinks will slow results.
- Protein intake: Low protein leads to muscle loss, which slows metabolism over time.
- Physical activity: Daily walking and some strength training help you lose fat, not muscle.
- Sleep and stress: Poor sleep and high stress raise hunger hormones.
- Hormonal issues: Untreated hypothyroidism or PCOS can slow down weight loss.
- Missed doses: Skipping weekly injections breaks the rhythm and reduces results.
7 Tips to Lose More Weight on Mounjaro
- Make protein your priority. Include dal, paneer, curd, eggs, chicken, fish, soya or sprouts in every meal so that you lose fat and keep your muscles.
- Eat slowly and stop when you feel full. Mounjaro makes you feel full early, so do not force yourself to finish the plate.
- Cut down on liquid calories. Sweet tea, packaged juices, cold drinks and alcohol add calories quickly.
- Drink enough water. It helps with constipation and dehydration, two common side effects.
- Walk every day. Aim for at least 30 to 45 minutes of brisk walking, and add light strength exercises 2 to 3 times a week.
- Take your injection on the same day every week. Set a phone reminder so you do not miss a dose.
- Follow up regularly with your doctor. Your dose needs to be increased at the right time, not too early and not too late.
When Should You Worry About Slow Weight Loss?
Talk to your doctor if:
- You have lost less than 5% of your body weight after 3 to 4 months on a proper dose
- Your weight has stopped moving for more than 2 months
- You are losing weight but feel very weak, dizzy or unable to eat
- You have severe stomach pain, persistent vomiting or signs of dehydration
Your doctor may adjust the dose, check your thyroid and other tests, or suggest a different plan. Never increase the dose on your own to speed things up, as this is the most common cause of severe side effects.
Is Mounjaro Better Than Ozempic or Wegovy for Weight Loss?
In head-to-head research, tirzepatide (Mounjaro) has generally given more weight loss than semaglutide (Ozempic and Wegovy). However, Mounjaro also costs more. In India, Mounjaro KwikPen costs Rs 13,125 to Rs 25,781 per month depending on the dose, while Wegovy costs Rs 5,660 to Rs 16,400 and generic semaglutide starts from around Rs 1,290 per month.
For a detailed comparison, read our articles on Mounjaro vs Ozempic, Wegovy vs Mounjaro, Mounjaro cost in India and Yurpeak cost in India.
What Happens After You Stop Mounjaro?
This is something every patient should know before starting. Obesity is a long-term condition, and if Mounjaro is stopped suddenly without proper lifestyle changes, a good part of the lost weight can come back over the next year.
That is why the first few months on Mounjaro should also be used to build habits that stay with you: better food choices, more protein, regular exercise and good sleep. Your doctor can plan a slow and safe way to reduce or stop the injection when the time is right.
When Mounjaro Alone May Not Be Enough
For people with a very high BMI (usually above 35 to 40), or those with uncontrolled diabetes, sleep apnoea or severe joint problems, even 15% to 20% weight loss may not be enough to reverse their health issues. In such cases, options like the Allurion gastric balloon or bariatric surgery may give more lasting results.
You can check your BMI with our free BMI calculator to understand where you stand.
Frequently Asked Questions
How much weight can I lose on Mounjaro in the first month?
Most people lose around 2% to 4% of their body weight in the first month, which is about 2 to 4 kg for a person weighing 100 kg. The first month is on the low starting dose of 2.5 mg, so weight loss is usually modest.
How much weight can I lose on Mounjaro in 3 months?
By 3 months, a weight loss of around 5% to 8% of body weight is common, which is roughly 5 to 8 kg for someone starting at 100 kg.
Can I lose 10 kg in 1 month with Mounjaro?
It is very unlikely and not recommended. Losing 10 kg in a month usually means a lot of water and muscle loss, and may come with weakness, dehydration or gallbladder problems. A slow and steady loss is safer and lasts longer.
Why am I not losing weight on Mounjaro 2.5 mg?
The 2.5 mg dose is mainly a starting dose to help your body adjust. Many people see better weight loss only after moving to 5 mg or higher. Speak to your doctor before changing the dose.
How long does Mounjaro take to show results?
Most people feel less hungry within the first 1 to 2 weeks. Visible weight loss usually starts showing between 8 and 12 weeks.
What is the maximum weight loss on Mounjaro?
In the SURMOUNT-1 trial, people on the highest 15 mg dose lost about 21% of their body weight on average over 72 weeks, and more than one third lost 25% or more.
Do people with diabetes lose less weight on Mounjaro?
Yes, people with type 2 diabetes usually lose slightly less weight than people without diabetes, but they also get the extra benefit of better blood sugar control.
Final Word
Mounjaro is one of the most effective weight loss medicines available in India today, but it is not a magic injection. Expect around 2 to 4 kg in the first month, 5 to 8 kg by 3 months for a 100 kg person, and much bigger results over a year or more when combined with the right diet and activity.
If you are planning to start Mounjaro or are not happy with your progress so far, you can book a consultation with Dr Rajat Goel for a personalised plan and proper medical supervision.
Disclaimer: This article is for general awareness only and is not a substitute for medical advice. Weight loss figures are averages from clinical studies and clinical experience, and individual results vary. We do not sell or promote the sale of any medicine through this website.
