The Names You Need to Know: Mounjaro and Wegovy
Both medicines belong to a class that acts on appetite-regulating pathways in the body, but they work in slightly different ways.
Mounjaro (tirzepatide)
Mounjaro's active substance is tirzepatide. It is a dual GIP and GLP-1 receptor agonist, meaning it acts on two separate hormonal pathways involved in appetite and blood sugar regulation. It is supplied as a pre-filled pen and is injected once a week. Dose strengths commonly associated with Mounjaro include 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, and 15 mg, with adjustments made by your prescriber over time.
Wegovy (semaglutide)
Wegovy's active substance is semaglutide. It is a GLP-1 receptor agonist, acting on one of the same appetite-related pathways as Mounjaro. Also a once-weekly pre-filled pen injection, Wegovy's dose strengths commonly referenced include 0.25 mg, 0.5 mg, 1 mg, 1.7 mg, and 2.4 mg, again adjusted by your prescriber.
What these medicines have in common
- Both are prescription-only — they are not available without a prescription from a qualified prescriber
- Both are injected once weekly using a pre-filled pen device
- Both act on appetite-regulating hormonal pathways, with many people commonly reporting reduced appetite and an increased sense of fullness
- Both carry a black triangle (▼) designation in the UK, meaning side effects should be reported to your national reporting scheme (such as the UK's Yellow Card scheme) and to your healthcare professional
- Neither is insulin, and neither is a cosmetic procedure
For a broader overview of how these medicines are used, see our guide to weight loss injections. You may also find it useful to read about slimming injection names and types for a wider look at the terminology used.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
Tracking the right four numbers — weight, waist, protein and dose — turns a noisy chart into a clear story. That's the loop GLP-1 users keep coming back for.
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Tracking Your Injection Journey with GLP Trackr
Knowing the name of your injection is just the starting point — staying consistent week after week is where the real work happens. GLP Trackr is built specifically for people already on Mounjaro or Wegovy, and the feature most relevant here is injection-site tracking and rotation.
Common injection sites for these medicines include the abdomen, thigh, and upper arm. Rotating between sites each week is generally recommended to allow each area to recover, but keeping mental track of where you last injected can quickly become confusing. In GLP Trackr, you log each injection — including the site you used — and the app tracks your rotation history, suggesting where to inject next so you never have to guess.
Alongside site tracking, the app also logs your dose strength and injection date, giving you a clear, timestamped record of every shot. This is particularly useful when your prescriber asks how you have been getting on or whether you have missed any doses — you can bring a clear summary straight from the app to your appointment.
If you are thinking about the cost side of your treatment, our page on weight loss injection pricing addresses that topic in more detail.
GLP Trackr is free to try for 7 days — download it on the App Store or Google Play and start logging your injections, tracking your rotation, and building a record of your journey from day one.
Any questions about which medicine is right for you, or how your dose should progress, should always be discussed with your prescriber or doctor — they are best placed to advise based on your full health history. If you experience any side effects that feel severe or persistent, contact your healthcare professional promptly.
What does glptrackr include?
10+ powerful features. One app. Built specifically for Mounjaro and Wegovy users.
Everything your GLP-1 journey needs. Free to try for 7 days.
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.
AI Meal Scanning
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.
Exercise & Steps
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.
Community Support
Connect with thousands of others navigating the same medication journey. Share milestones, ask questions, find accountability partners, and get support from people who truly understand.
Never Forget a Dose Again.
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.
Watch Your Body Transform, Week by Week.
Log your weight, measurements, and how you're feeling after each dose. GLPTrackr turns your data into clear, motivating charts that show you how far you've really come.
You're Not on This Journey Alone.
Connect with thousands of real GLP-1 users sharing their wins, side effect tips, and meal ideas. Get the support of people who truly get it — because they're living it too.
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The Most Advanced GLP-1 Brain Ever Built.
The first AI built exclusively for GLP-1 weight loss. Every insight, every meal plan, every prediction trained on one thing only: helping you get the most out of your medication.
Knows Your Cycle
GLPIQ tracks where you are in your injection cycle and adjusts everything around it: lighter meals on nausea days, higher protein when appetite returns, and smarter targets as your medication level shifts.
Predicts Before You Feel It
GLPIQ learns your personal side effect patterns over time. After a few cycles, it starts warning you the morning before a rough day — and adjusts your meal plan automatically.
Finds Your Golden Dose
GLPIQ analyses every dose you've been on: weight loss rate, side effects, food noise, mood, protein adherence and tells you which dose gave you the best results. No other app does this.
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Frequently asked questions.
The two most widely prescribed weight loss injections are Mounjaro (active substance: tirzepatide) and Wegovy (active substance: semaglutide). Both are once-weekly injectable, prescription-only medicines. Your prescriber will determine which is appropriate for you.
Mounjaro contains tirzepatide, a dual GIP and GLP-1 receptor agonist. Wegovy contains semaglutide, a GLP-1 receptor agonist. Both reduce appetite via hormonal pathways, but they act on different combinations of receptors. Which is suitable for you is a decision for your prescriber.
No. Mounjaro and Wegovy are prescription-only medicines. They must be prescribed by a qualified healthcare professional and obtained through a registered pharmacy. No prescription is needed to use GLP Trackr, which is a tracking app for people already prescribed these medicines.
GLP Trackr lets you log each injection site — abdomen, thigh, or upper arm — and tracks your rotation history. The app can then suggest your next site, helping you rotate correctly without having to remember manually.
Rotating injection sites each week is generally recommended so that each area has time to recover. Your prescriber or the patient information leaflet that came with your medicine can give you specific guidance on rotation for your prescription.