Comparing the leading weight-loss medications
Choosing the right medication for weight loss can be challenging with several options on the market. Among the most popular are Ozempic, Mounjaro and Saxenda. This article compares how each works to help you understand which might suit you — always alongside medical guidance.
What is Ozempic?
Ozempic (semaglutide) is primarily used to improve blood sugar control in adults with type 2 diabetes, but it has also been found to aid weight loss. It regulates insulin levels and reduces appetite, which can lead to significant weight reduction over time.
What is Mounjaro?
Mounjaro (tirzepatide) is a newer treatment approved for managing blood sugar in type 2 diabetes. Like Ozempic, it helps lower blood sugar and supports weight loss. Its dual action as a GIP and GLP-1 receptor agonist may offer advantages over GLP-1 agonists alone.
What is Saxenda?
Saxenda (liraglutide) is a GLP-1 receptor agonist like Ozempic, approved specifically for weight management in adults and children aged 12 and older who are obese or overweight. It works by decreasing appetite and calorie intake.
See how the claim works →Comparing effectiveness
Clinical trials provide valuable insight into how these medications perform for weight loss. Ozempic and Saxenda have established reputations with positive feedback and proven clinical effectiveness. Mounjaro has been reported to lead to potentially greater weight reduction, which may give it a competitive edge for some people.
Side effects and considerations
While all three are generally well tolerated, they share possible side effects — nausea, diarrhoea and constipation are the most common. Because they affect glucose metabolism, they are not suitable for everyone, which is why a doctor's assessment is essential before starting.
Which is right for you?
Whether Ozempic, Mounjaro or Saxenda is best depends on your individual health profile and goals. Consulting a doctor is essential to make an informed, safe choice. Our Irish-registered doctors review your details and recommend the most suitable option — if treatment is right for you at all.
Ozempic vs Mounjaro vs Saxenda: side-by-side
| Ozempic | Mounjaro | Saxenda | |
|---|---|---|---|
| Active ingredient | Semaglutide | Tirzepatide | Liraglutide |
| Drug class | GLP-1 receptor agonist | Dual GIP & GLP-1 agonist | GLP-1 receptor agonist |
| Primary licence | Type 2 diabetes | Type 2 diabetes | Weight management (age 12+) |
| How it's taken | Once-weekly injection | Once-weekly injection | Once-daily injection |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, diarrhoea, constipation | Nausea, diarrhoea, constipation |
All three are prescription-only and require a doctor's assessment before starting, as they are not suitable for everyone.
Ozempic vs Mounjaro vs Saxenda FAQs
What is the difference between Ozempic, Mounjaro and Saxenda?
They use different active ingredients — semaglutide (Ozempic), tirzepatide (Mounjaro) and liraglutide (Saxenda). Ozempic and Saxenda are GLP-1 receptor agonists, while Mounjaro has a dual GIP/GLP-1 action. Ozempic and Mounjaro are once-weekly injections; Saxenda is taken once daily.
Which is most effective for weight loss?
Clinical trials suggest tirzepatide (Mounjaro) may lead to greater weight reduction for some people, but effectiveness varies by individual and depends on your health profile. A doctor is best placed to advise which, if any, is suitable for you.
Is Mounjaro better than Ozempic?
Mounjaro's dual action may offer advantages for some people, but "better" depends on your individual circumstances, tolerability and goals — which is why a medical assessment matters before choosing.
How often do you take each one?
Ozempic and Mounjaro are once-weekly injections; Saxenda is a once-daily injection.
Do they have the same side effects?
They share similar gastrointestinal side effects — most commonly nausea, diarrhoea and constipation — and none are suitable for everyone, so a doctor's assessment is essential first.
How do I know which is right for me?
Only a doctor can decide, after reviewing your health profile and goals. You can take Slimbr's free eligibility quiz to start a medical assessment.
