Mounjaro vs Ozempic: the bigger number, and what it does not tell you
Reviewed against published clinical trial data. Last updated July 2026.
Medically reviewed by Dr. Kaynat Khan, Endocrinology · Obesity Medicine
Quick answer
Mounjaro is tirzepatide and acts on two hunger hormones; Ozempic is semaglutide and acts on one. Tirzepatide tends to show more weight loss in trials, but tolerance, health, and cost decide the right choice, which a doctor makes with you.
Mounjaro vs Ozempic is the matchup everyone Googles. The bigger number is real, and it still does not settle which one is right for you.
This is the comparison people search most, and it is usually framed as strong versus stronger. The real picture is more useful than that.
They are not the same kind of medicine
Ozempic is semaglutide and works on one hunger hormone, GLP-1. Mounjaro is tirzepatide and works on two, GLP-1 and GIP. That extra target is why tirzepatide tends to show larger weight loss in trials.
| Mounjaro | Ozempic | |
|---|---|---|
| Medicine | Tirzepatide | Semaglutide |
| How it is taken | Weekly injection | Weekly injection |
| Average weight loss | Up to about 22.5% (SURMOUNT-1) | About 15% (STEP 1, weight dose) |
| Mainly approved for | Type 2 diabetes and weight | Type 2 diabetes |
| Common side effects | Nausea, diarrhea, stomach pain | Nausea, constipation, upset stomach |
| In India | Launched in India in 2025, prescription-only. | Available in India, prescription-only. Generics from 2026. |
The bigger number is real
In trials, tirzepatide reached up to about 22.5% weight loss at the highest dose (SURMOUNT-1, NEJM 2022), versus roughly 15% for semaglutide (STEP 1, NEJM 2021). On a chart, tirzepatide wins.
Why the number does not settle it
A larger average in a trial is not a promise for your body. Some people tolerate one better than the other. Health conditions, side effects, what is available, and cost all matter, and the difference between them can be smaller in real life than on a slide. This is a decision for a doctor who knows your history.
The bigger number is a starting point, not a verdict. The right medicine is the one that is right and safe for you.
If you are choosing between them, a short consult gives you a real answer instead of a headline.
Common questions
Is Mounjaro stronger than Ozempic?
In trials tirzepatide (Mounjaro) produced more weight loss than semaglutide (Ozempic), up to about 22.5% versus about 15%. But more on average is not automatically better for a given person.
What is the difference between Mounjaro and Ozempic?
Mounjaro is tirzepatide and works on two hunger hormones (GLP-1 and GIP); Ozempic is semaglutide and works on one (GLP-1). That dual action is why tirzepatide tends to show more weight loss.
Which should I choose, Mounjaro or Ozempic?
It depends on your health, how you tolerate side effects, availability, and cost. A doctor weighs these with you. The bigger trial number does not decide it on its own.
Are both available in India?
Yes. Mounjaro launched in India in 2025 and semaglutide (Ozempic) is available too. Both are prescription-only and need a doctor's assessment.
Do they have different side effects?
Both cause mostly stomach-related side effects early on, such as nausea. Mounjaro is also associated with diarrhea and stomach pain. They usually settle as the dose is raised slowly.
Sources
This article is general information, not medical advice. A doctor decides what is right for you in a consultation.