Mounjaro and Wegovy: The Names Behind the Injections
Both medicines belong to a class that acts on appetite-regulating pathways in the body, helping many people experience a reduced sense of hunger and an increased feeling of fullness after eating.
Mounjaro (tirzepatide)
Mounjaro's active substance is tirzepatide. It is a dual GIP and GLP-1 receptor agonist, meaning it acts on two separate appetite-related pathways. It is supplied as a pre-filled injection pen and is taken once a week. Dose strengths commonly referenced include 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, and 15 mg — with the starting dose and any adjustments decided entirely by the prescriber.
Wegovy (semaglutide)
Wegovy's active substance is semaglutide. It is a GLP-1 receptor agonist, also given as a once-weekly pre-filled pen injection. Commonly referenced dose strengths run from 0.25 mg up to 2.4 mg, again with all titration decisions made by the prescriber, not the patient.
What they have in common
- Both are prescription-only medicines — they cannot be obtained without a prescription from a qualified prescriber.
- Both are self-injected once a week, typically into the abdomen, thigh, or upper arm.
- Neither is insulin, and neither is a cosmetic treatment — suitability is assessed by a prescriber based on individual health history.
- Both carry a black triangle (▼) status in the UK, meaning side effects should be reported to your national reporting scheme (such as the UK's Yellow Card scheme) and discussed with your healthcare professional.
For a closer look at how these two medicines compare, see our guide to weight-loss injections, or read more about the newer slimming injections now available. If you were prescribed one of these medicines in the context of type 2 diabetes management, our page on diabetes injections used for weight loss may also be useful.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Tracking Your Injections with GLP Trackr
Once you are prescribed Mounjaro or Wegovy, one of the most practical challenges is keeping track of where and when you inject each week. Rotating your injection site — moving between the abdomen, thigh, and upper arm — is generally recommended to allow each area to recover, and it is easy to forget which site you used last.
GLP Trackr's injection-site tracking feature is built for exactly this. Each time you inject, you log the site in the app; GLP Trackr records your rotation history and suggests where to inject next, so you never have to rely on memory alone. Alongside that, the dose-logging tool lets you record the strength and date of every shot, giving you a clear, time-stamped record of your treatment as it progresses.
Having that record can also be genuinely useful at prescriber appointments — a concise log of your injection history, alongside any side effects you have noted, gives your doctor a clearer picture of how your journey is going. You can explore more about how weight-loss injections work in practice and what to expect week to week.
If you ever experience injection-site reactions or anything that concerns you, contact your prescriber or healthcare professional — GLP Trackr helps you record what you observe, but it is not a substitute for clinical advice.
Ready to keep every injection organised? Download GLP Trackr on the App Store or Google Play and start a free 7-day trial — your injection log, rotation history, and dose record, all in one place.
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Morning Check-In
Start every day with a 60-second wellness check-in. Log how you're feeling, track nausea, appetite, energy, and mood — giving you and your care team a complete picture of how your medication is working.
Injection Tracking
Log every dose with a single tap. Track your dose history, phase in your cycle, estimated medication levels, and upcoming injection dates — with reminders so you never miss a scheduled shot.
Hydration Reminders
Staying hydrated is especially important on GLP-1 medications. Set daily water targets, log intake throughout the day, and receive smart nudges when you're falling behind your goal.
Smart Meal Planning
Personalized meal plans built around your current dose phase and side effects. Every meal is GLP-1 optimized — high in protein, gentle on the stomach, and scaled to your reduced appetite.
Recipe Library
Browse 50+ high-protein, GLP-1-friendly recipes filtered by meal type, prep time, and dietary needs. Every recipe includes full nutrition info, step-by-step instructions, and tips for eating with side effects.
Progress Analytics
Beautiful, easy-to-read charts show your weight loss trajectory, weekly nutrition trends, medication responses, and wellbeing scores over time — turning raw data into genuine insights.
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Snap a photo of any meal and get a full nutrition breakdown in seconds — calories, protein, carbs, fat, and fibre. No searching. No manual logging. Just point, snap, and track.
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Log walks, workouts, and movement with activity targets that flex with your energy levels. On lower-energy dose days, gentler targets keep you moving without burning out.
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Log your Mounjaro or Wegovy injection in seconds. Track your pen, your dose level, and your injection site — so you always know exactly where you are in your treatment.
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Frequently asked questions.
The two main prescription weight-loss injections are Mounjaro (tirzepatide) and Wegovy (semaglutide). Both are once-weekly injectable medicines prescribed by a doctor or specialist; they are not available without a prescription.
Mounjaro contains tirzepatide, a dual GIP and GLP-1 receptor agonist. Wegovy contains semaglutide, a GLP-1 receptor agonist. Both are once-weekly injections for weight management, but they work on different pathways. Which is right for you is a decision for your prescriber.
Rotating between sites — such as the abdomen, thigh, and upper arm — is generally recommended to allow each area to recover. Your prescriber or the patient information leaflet for your medicine will provide guidance specific to your treatment.
GLP Trackr lets you log each injection's date, dose strength, and site. The app tracks your rotation history and suggests your next site, so you always know where you injected last and when your next dose is due.
No. Mounjaro and Wegovy are not insulin. They are GLP-1 receptor agonists (and in Mounjaro's case, also a GIP receptor agonist) that act on appetite-regulating pathways. Suitability for any individual is assessed by a prescriber.