Tirzepatide and Semaglutide: What Makes Them Different
Both medicines are delivered as once-weekly subcutaneous injections — meaning they go just beneath the skin, typically in the abdomen, thigh, or upper arm. Each is supplied as a pre-filled pen and started at a low dose, with adjustments made over time by the prescriber.
Tirzepatide (Mounjaro)
Tirzepatide is a dual GIP and GLP-1 receptor agonist — the dual-action mechanism is what distinguishes it from earlier GLP-1 medicines. It acts on appetite-regulating pathways in the brain and also slows gastric emptying, which many people describe as reducing "food noise" and increasing feelings of fullness. Available dose strengths commonly referenced are 2.5 mg through to 15 mg, titrated under prescriber guidance. It carries a black triangle (▼) status in the UK, meaning any side effects should be reported to your national reporting scheme (such as the UK's Yellow Card scheme) and to your healthcare professional.
Semaglutide (Wegovy)
Semaglutide is a GLP-1 receptor agonist and has been available for weight management for longer than tirzepatide. It works through similar appetite and satiety pathways, and is also given once weekly via a pre-filled pen. Dose strengths range from 0.25 mg up to 2.4 mg, again adjusted by the prescriber over time. Like tirzepatide, it carries black triangle status.
Important context
Neither medicine is insulin, nor a cosmetic quick fix. Both are prescription-only and require clinical supervision. For a broader look at how these weight loss injections work and what to expect, our main guide covers the topic in full. If you are weighing up options, our overview of weight loss injection choices explains the considerations involved — though ultimately the right medicine is a conversation to have with your prescriber. You can also read more about what a weight loss injection involves if you are newer to this type of treatment.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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How GLP Trackr Helps You Stay on Top of Your Injections
Once you are prescribed a weekly injection, keeping track of where and when you inject matters more than it might initially seem. Rotating your injection site — cycling between the abdomen, thigh, and upper arm — helps reduce the chance of skin irritation at any one spot, and it is easy to lose track of where you last injected across a weekly schedule.
GLP Trackr's injection-site tracking and rotation feature is built exactly for this. Each time you log an injection, you record the site you used; the app keeps a history of your rotation so you always know where to go next. Alongside that, dose logging means every injection — date, time, and dose strength — is stored in one place, giving you a clear record to refer back to or share at a prescriber appointment.
Dose reminders mean a weekly injection is far less likely to be forgotten, even when your schedule shifts. If you are looking at what is involved in accessing these injections, GLP Trackr is there to support the journey once you are prescribed — helping you get the most from every dose through consistency and clear records.
Your prescriber or doctor is always the right person to consult about injection technique, site concerns, or any reactions you notice — GLP Trackr helps you log what is happening so those conversations are better informed, not replace them. If you experience anything severe or persistent at an injection site, contact your healthcare professional promptly.
Already prescribed and ready to take the guesswork out of site rotation? GLP Trackr is free to try for 7 days — download it on the App Store or Google Play and start logging from your very next dose.
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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.
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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.
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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.
Tirzepatide (Mounjaro) is the most recently approved once-weekly weight loss injection, acting on both GIP and GLP-1 receptors. Semaglutide (Wegovy) is also a current once-weekly option. Both are prescription-only medicines; your prescriber or doctor determines which is appropriate for you.
Both tirzepatide and semaglutide are given as once-weekly subcutaneous injections — just beneath the skin — using a pre-filled pen. Common injection sites include the abdomen, thigh, and upper arm. Your prescriber or the patient information leaflet will guide you on technique.
Yes, rotating between sites — such as the abdomen, thigh, and upper arm — is generally recommended to reduce skin irritation from repeated injections in the same spot. Your prescriber or the information leaflet with your pen will confirm the guidance specific to your medicine.
Yes. Tirzepatide (Mounjaro) received approval for weight management more recently than semaglutide (Wegovy). Tirzepatide also has a dual mechanism, targeting both GIP and GLP-1 receptors, whereas semaglutide targets GLP-1 receptors alone. Suitability is a decision for your prescriber.
GLP Trackr lets you log each injection — date, time, dose strength, and site — and tracks your rotation history so you always know where to inject next. Dose reminders help ensure you never miss a weekly dose.