Mounjaro and Wegovy: What the Evidence Says
Both Mounjaro and Wegovy are prescription-only, once-weekly injectable medicines supplied as pre-filled pens. Neither is available without a prescription, and suitability is always determined by a qualified prescriber.
How each medicine works
Wegovy contains semaglutide, a GLP-1 receptor agonist. It acts on appetite-regulating pathways in the brain and slows gastric emptying, which many people describe as reducing "food noise" and increasing feelings of fullness.
Mounjaro contains tirzepatide, a dual GIP and GLP-1 receptor agonist. It activates two appetite-related pathways rather than one. According to information on the electronic Medicines Compendium (eMC), tirzepatide is the active substance in Mounjaro's licensed product.
What they have in common
- Both are once-weekly subcutaneous injections
- Both are started at a low dose and adjusted over time by a prescriber
- Both are prescription-only — not available over the counter
- Both carry a black triangle (▼), meaning they are subject to additional monitoring; any side effects should be reported to your healthcare professional and your national reporting scheme (such as the UK's Yellow Card scheme)
The question of "best"
Comparing these medicines to decide which is "better" is not something that can be answered in general terms — individual response, existing health conditions, and other medicines all affect the right choice. For a more detailed factual comparison, see our page on what is the best injection for weight loss, and for a broader overview of how injectable weight-loss medicines work, visit our weight-loss injections guide.
If you are already prescribed Mounjaro, you can read more about Mounjaro as an injection for weight loss, or explore our general overview of injectable medicines for weight loss for context on how these treatments fit into a managed programme.
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 Helps Once You Are Prescribed
Whichever medicine your prescriber has chosen for you, staying consistent with weekly injections is one of the most practical challenges of the journey — and that is exactly where GLP Trackr is built to help.
Injection-site tracking and rotation
The app's injection-site tracker lets you log each injection — recording the site (abdomen, thigh, or upper arm), the date, and the dose strength. Over time it builds a rotation history and can suggest your next site, so you are not relying on memory. Rotating sites is generally recommended to reduce localised reactions, and having a clear log makes it straightforward to follow.
Dose reminders so you never miss a week
Weekly injection schedules are easy to lose track of, especially across busy weeks or when travelling. GLP Trackr's dose reminders send a gentle nudge so your injection day does not slip by unnoticed.
A record to bring to your prescriber
The app also generates a summary of your injection history, weight, and any side effects you have logged — useful to bring to a review appointment so your prescriber has a clear picture of how your journey is progressing.
Always follow the guidance of your prescriber or doctor. Any decisions about your dose, injection technique, or whether to continue treatment belong with them, not with a tracking app.
Ready to keep a clear log of every injection from here on? GLP Trackr is free to try — download it on the App Store or Google Play and start your 7-day free trial today.
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.
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 injectable weight-management medicines are Mounjaro (tirzepatide) and Wegovy (semaglutide). Both are once-weekly subcutaneous injections available on prescription only. Which one is appropriate for any individual is decided by a prescriber.
There is no single answer that applies to everyone. Both Mounjaro and Wegovy are used for weight management, but the right choice depends on your health history and circumstances. Your prescriber is the right person to advise which medicine, if either, is suitable for you.
No. Mounjaro and Wegovy are prescription-only medicines. They are not available without a valid prescription from a qualified prescriber, and cannot be purchased over the counter.
GLP Trackr lets you log each injection, including dose strength, date, and injection site. It tracks your rotation history, suggests your next site, and sends dose reminders so you do not miss a weekly injection.
Rotation of injection sites is generally recommended to reduce localised skin reactions. Your prescriber or the patient information leaflet supplied with your pen will provide guidance specific to your medicine. GLP Trackr's site tracker helps you keep a clear rotation log.