Mounjaro and Wegovy: What They Are and How They Differ
Both Mounjaro and Wegovy are prescription-only, once-weekly injectable medicines supplied as pre-filled pens. They work on appetite-regulating pathways in the body, and many people taking them report a reduced sense of hunger and increased feelings of fullness — though individual responses vary.
Mounjaro (tirzepatide)
Mounjaro's active substance is tirzepatide, which acts on two receptors: GLP-1 and GIP. It is typically started at a low dose and adjusted over time under prescriber guidance. Dose strengths commonly referenced include 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, and 15 mg.
Wegovy (semaglutide)
Wegovy's active substance is semaglutide, a GLP-1 receptor agonist. Like Mounjaro, it is started at a lower dose and titrated upward by the prescriber. Commonly referenced strengths run from 0.25 mg up to 2.4 mg.
Neither is universally "the best"
Both medicines carry a black triangle (▼) designation, meaning they are subject to additional monitoring. Side effects should be reported to your healthcare professional and to your national reporting scheme (such as the UK's Yellow Card scheme). Suitability, tolerability, and the most appropriate choice depend on factors only your prescriber can assess — not general rankings or online comparisons.
For a broader look at how these options compare factually, see our guide to what to know about weight loss injections, or explore the current landscape of weight loss injections on the market. You may also find our page on how to approach the question of which injection suits you a useful read alongside this one.
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 Weight Loss Injection Journey with GLP Trackr
Whichever medicine you have been prescribed, staying consistent with a weekly injection schedule — and keeping a clear record of every dose — is one of the most practical things you can do to support your journey.
GLP Trackr's injection-site tracking and rotation feature lets you log each injection: the site used (abdomen, thigh, or upper arm), the date, and the dose strength. The app then tracks your rotation history and suggests your next site automatically, so you never have to remember which spot you used last week. Paired with dose reminders, it means a missed injection is far less likely — and if you do need to flag a missed dose, logging it in the app gives you something concrete to discuss with your prescriber at your next appointment.
Beyond the injection itself, the app brings together your weight, mood, energy, and side-effect logs into a single view, so you can see how your body is responding over time — useful context to bring to any prescriber conversation.
Any concerns about your dose, your injection site, or how you are responding to your medicine should always be discussed with your prescriber or doctor. GLP Trackr supports your tracking; it does not replace clinical guidance.
Ready to keep a clear, organised record of your injection journey? Download GLP Trackr on the App Store or Google Play — your first seven days are free.
Learn more about managing your weekly injection in our complete guide to weight loss injections.
What does glptrackr include?
10+ powerful features. One app. Built specifically for Mounjaro and Wegovy users.
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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.
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.
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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.
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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.
Mounjaro (tirzepatide) and Wegovy (semaglutide) are the most widely prescribed once-weekly injectable weight loss medicines currently available. Neither can be called universally "best" — the right option for any individual is a decision for their prescriber, based on their personal health history and circumstances.
Mounjaro contains tirzepatide and acts on both GLP-1 and GIP receptors. Wegovy contains semaglutide and acts on GLP-1 receptors. Both are once-weekly injectable prescription medicines used for weight management. Your prescriber will determine which, if either, is appropriate for you.
No — these are prescription-only medicines and the choice is made by your prescriber based on your individual health profile, medical history, and clinical suitability. It is not a decision that can or should be made without professional guidance.
GLP Trackr lets you log each injection — including dose, date, and site — and tracks your rotation history so the app can suggest your next injection site. Dose reminders help keep your weekly schedule on track. It supports both Mounjaro and Wegovy users.
Yes. Both Mounjaro and Wegovy carry additional monitoring status. Report any side effects to your healthcare professional and to your national reporting scheme — for example, the UK's Yellow Card scheme. Your prescriber can advise on whether symptoms need attention.