Mounjaro and Wegovy: What the Evidence Says
Both Mounjaro and Wegovy are prescription-only injectable medicines taken once a week. They work by acting on appetite-regulating pathways in the body, leading to commonly reported effects such as reduced appetite, a greater sense of fullness, and slower stomach emptying.
How they differ
- Wegovy (semaglutide) is a GLP-1 receptor agonist. It mimics a hormone involved in regulating hunger and food intake.
- Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist, meaning it acts on two appetite-related pathways rather than one.
Both are started at a low dose and adjusted over time — always under a prescriber's direction. Neither is a quick fix or a substitute for the broader lifestyle changes your prescriber will discuss with you.
Which is "best"?
No injectable medicine is universally superior. Suitability depends on your health history, any other medicines you take, and your prescriber's clinical judgement. Framing like "best weight loss jab" can be misleading — the right medicine is the one that has been prescribed to you, for your circumstances.
For a detailed factual comparison, see our page on comparing weight loss injections, or explore the latest weight loss injections available for broader context on how this class of medicine has developed.
You can also read more about what makes an injectable weight loss medicine effective and how prescribers weigh up options.
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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How GLP Trackr Supports Your Injection Routine
Once you are prescribed a weight loss injection, consistency matters. Rotating injection sites correctly — cycling between the abdomen, thigh, and upper arm — helps avoid skin reactions and keeps the medicine absorbing well. Keeping track of where you last injected is easy to forget across weeks of treatment.
GLP Trackr's injection-site tracker logs each site you use and suggests your next rotation automatically, so you never have to guess or try to remember. Alongside that, the app's dose logging feature records every injection — date, time, and dose strength — giving you a clear, timestamped record of your treatment history.
That record is genuinely useful at prescriber appointments: rather than trying to recall how the past few weeks have gone, you can bring a clear summary with you. The app's doctor report feature compiles your logged data — doses, side effects, weight trends — into something you can share directly with your healthcare professional.
For a broader look at how injectable weight loss medicines work and what to expect, visit our guide to weight loss injections, and see what to look for in weight loss injections for more context.
Any questions about your specific dose, injection technique, or whether your prescribed medicine is working as expected should always go to your prescriber or doctor — they have your full clinical picture and are best placed to advise you.
Ready to take control of your injection routine? GLP Trackr is free to try for 7 days — download it on the App Store or Google Play and let the app handle your site rotation and dose history from day one.
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.
Mounjaro (tirzepatide) is a widely prescribed once-weekly injection for weight management, but whether it is right for any individual depends on their medical history and their prescriber's judgement. No single injection is universally best — suitability is always a clinical decision.
Wegovy contains semaglutide, a GLP-1 receptor agonist. Mounjaro contains tirzepatide, which acts on both GLP-1 and GIP receptors. Both are once-weekly injectables prescribed for weight management. The choice between them is made by a prescriber based on individual health factors.
Common injection sites for Mounjaro and Wegovy include the abdomen, thigh, and upper arm. Rotating between sites is generally recommended to avoid skin reactions. Your prescriber or the patient information leaflet with your medicine is the best source of guidance on technique and site choice.
GLP Trackr logs each injection — date, time, dose strength, and site — and suggests your next rotation automatically. It also generates a summary report you can bring to prescriber appointments, giving you a clear record of your treatment history without relying on memory.
Both Mounjaro (tirzepatide) and Wegovy (semaglutide) are prescription-only medicines. Access is through a qualified prescriber and a registered pharmacy in your country. How they are prescribed varies by healthcare system — speak to your doctor or prescriber for guidance specific to your situation.