The Mounjaro vs Wegovy decision usually comes down to active ingredient and how your body responds to each.
Choosing between Mounjaro vs Wegovy? Here’s how the two compare so you can discuss the right option with your prescriber.
Mounjaro and Wegovy are two of the most requested weight loss injections we stock, and the question we hear most is simple: which one should I choose? Here’s how they actually differ.
Active ingredient
Mounjaro contains tirzepatide, a dual GLP-1/GIP receptor agonist — it acts on two gut hormone pathways rather than one. Wegovy contains semaglutide, which acts on the GLP-1 pathway alone. Both reduce appetite and slow digestion; Mounjaro’s dual mechanism is thought to be why it has shown somewhat greater average weight loss in head-to-head trial data.
Dosing schedule
Both are once-weekly self-administered injections. Mounjaro is typically started at 2.5mg and titrated up to a maintenance dose (commonly 5-15mg) over several months. Wegovy starts at 0.25mg and is titrated up to a maintenance dose of 1.7mg or 2.4mg on a similar schedule. Neither should be dose-adjusted without your prescriber’s guidance.
Head-to-head trial data
The SURMOUNT-5 trial directly compared tirzepatide (Mounjaro) against semaglutide (Wegovy) in the same study population. Participants taking tirzepatide lost more weight on average than those taking semaglutide over the same treatment period. This is one of the few direct head-to-head comparisons between the two medicines, rather than separate trials compared indirectly, and is a large part of why tirzepatide is often described as the higher-efficacy option based on current published data. As always, trial averages describe group results, not a guarantee for any individual.
Price comparison
| Medication | Active ingredient | Price range on this site |
|---|---|---|
| Mounjaro | Tirzepatide | $140 – $310 |
| Wegovy | Semaglutide | $75 – $255 |
Side effects
Both share similar gastrointestinal side effects — nausea, constipation, and occasional reflux — most common during dose increases. Neither is significantly better tolerated than the other based on available data; individual response varies. As with other GLP-1/GIP medicines, less common but more serious risks can include gallbladder problems and pancreatitis, which is why ongoing clinical review is part of your prescription.
Which should you choose?
If cost is the deciding factor, Wegovy’s lower starting price point may suit your budget better. If you’re looking for the medication with the strongest average weight loss results in trials, Mounjaro is generally the stronger performer. Your prescriber will also factor in your medical history — some people respond better to one hormone pathway than the other.
Frequently Asked Questions
Can I switch from Wegovy to Mounjaro?
Switching between GLP-1 medications is possible but should only be done under clinical guidance, since dosing isn’t directly interchangeable.
Is Mounjaro stronger than Wegovy?
Mounjaro has shown greater average weight loss in comparative trial data, largely attributed to its dual hormone mechanism, but individual results vary.
Which is cheaper long-term?
Wegovy has a lower entry price per dose on our Wegovy page, but compare like-for-like doses on our Mounjaro page since maintenance doses differ between the two.
What if I miss a weekly dose?
Both medicines have specific guidance for a missed weekly injection depending on how many days have passed. This is set out in the patient information leaflet supplied with your medication, and your prescriber can advise if you’re unsure.
Ready to find out which one fits your health profile? Start your free eligibility assessment and our clinical team will guide you.
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Mounjaro vs Wegovy: the bottom line
For most people, the Mounjaro vs Wegovy choice isn’t about one being universally stronger than the other, but about which active ingredient — tirzepatide or semaglutide — suits your body and goals best. Some people respond more strongly to the dual-action mechanism in Mounjaro, while others find Wegovy’s single GLP-1 pathway easier to tolerate. Your prescriber will take your medical history, any prior GLP-1 treatment, and your weight loss goals into account before recommending which side of the Mounjaro vs Wegovy comparison is the better starting point for you.
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