Wegovy vs Mounjaro: a neutral, informational comparison

At a factual level, the two medicines share a once-weekly injection format and act on appetite-regulating pathways, but their active substances, mechanisms, and dose ladders differ. Below is a neutral side-by-side overview drawn from official product information such as the electronic Medicines Compendium (eMC) and BNF.

Active substance and mechanism

• Wegovy — semaglutide; a GLP-1 receptor agonist.
• Mounjaro — tirzepatide; a dual GIP and GLP-1 receptor agonist.

Both are commonly described as supporting feelings of fullness, reducing appetite or 'food noise', and slowing stomach emptying — an effect many people report easing over time. The exact biological behaviour differs because Mounjaro engages two receptor pathways while Wegovy engages one. For a closer look at the active-substance level, see the differences between the two medicines.

How each is taken

Both come as pre-filled injection pens designed for once-weekly self-injection, with rotating injection sites (commonly abdomen, thigh or upper arm). Pen design, storage and handling differ between products — always follow the patient information leaflet that came with your pen.

Dose strengths (what your prescriber works with)

This is one of the most common search points ("wegovy vs mounjaro doses", "dosage comparison"). The strengths are factual; how anyone moves between them is a prescriber-led decision and not advice on this page.

• Wegovy commonly referenced strengths: 0.25, 0.5, 1, 1.7 and 2.4 mg.
• Mounjaro commonly referenced strengths: 2.5, 5, 7.5, 10, 12.5 and 15 mg.

The milligram numbers are not directly comparable — they are two different molecules. A 1.7 mg Wegovy dose is not 'equivalent to' any particular Mounjaro dose, despite the popularity of that comparison online. Titration (starting low and adjusting) is standard practice for both, and the schedule is set by the prescriber, not by matching numbers across products. For more on titration generally, see information on the 5 mg Mounjaro dose and the overview on the Mounjaro hub.

Side-effect profile, at a glance

Commonly reported side effects for both medicines fall into similar categories — gastrointestinal effects such as nausea, vomiting, diarrhoea, constipation, reflux and indigestion, plus fatigue, headache, dizziness and injection-site reactions. Frequency and individual experience vary. For a more detailed look, see how side effects compare between the two, and real-world impressions on Wegovy vs Mounjaro reviews. Both medicines are subject to additional monitoring (▼) — suspected side effects should be reported to your healthcare professional and to your national reporting scheme (such as the UK's Yellow Card scheme).

How they sit alongside other GLP-1 medicines

You'll often see these two compared with semaglutide's other brand, Ozempic. For context, see Ozempic vs Wegovy, Ozempic vs Mounjaro, Wegovy vs Ozempic, the difference between Mounjaro and Ozempic, and the comparison page Mounjaro or Ozempic. None of those pages, or this one, suggest which medicine anyone 'should' be on — that decision belongs with the prescriber.

A note on cost and access

Search interest around "wegovy vs mounjaro price" or "wegovy vs mounjaro uk" is high, but prices and availability vary by country, pharmacy and time. GLP Trackr does not list prices and does not supply medication. For cost and access questions, your prescriber or a registered pharmacy in your country is the right starting point.

So which is 'better'?

That isn't a question this page will answer, and any source that does should be treated with caution. The medicines differ in mechanism and dose ladder; individual response varies; suitability depends on medical history. People weighing options often find it useful to read the framing on Wegovy or Mounjaro, the mirrored view on Mounjaro vs Wegovy, and Mounjaro or Wegovy — and then talk it through with their own prescriber.

GLP Trackr supports both Wegovy and Mounjaro inside the same app — log either medicine, at any strength your prescriber has set, and the app builds your journey around it. That makes it especially useful if you're early on, comparing your experience to what you've read, or if your prescriber ever changes your plan.

Built for either medicine

• Dose logging — record each weekly shot with the strength and date, so you always know where you are in your schedule (whether that's a 1.7 mg Wegovy week or a 7.5 mg Mounjaro week).
• Injection-site rotation — log the site you used and let GLP Trackr suggest the next one, which matters equally on either pen.
• Side-effect tracker — log nausea, fatigue, energy, food noise and more, so you can see your own patterns and bring a clear picture to your prescriber appointments.
• Weekly progress view — weight, measurements and a week-at-a-glance summary, regardless of which medicine you're tracking.

Useful if you ever switch

If your prescriber adjusts your treatment — including switching between GLP-1 medicines — keeping a continuous log of doses, side effects and progress in one place makes the transition easier to discuss and review. The doctor report feature pulls that history into a clear summary.

A note on safety

Anything you read here is general information, not medical advice. Decisions about which medicine to take, what dose to be on, whether to switch, or how to manage a symptom belong with your prescriber or doctor — they know your full history. If symptoms feel severe, persistent or worrying, contact your healthcare professional promptly. GLP Trackr helps you record the journey; it isn't a substitute for clinical care.

Try it free. Whether you're on Wegovy or Mounjaro, GLP Trackr keeps your doses, injection sites, side effects and progress in one place. It's free for 7 days on the App Store and Google Play — give it a week and see how much clearer your journey feels.