Mounjaro and Wegovy: What These Prescription Injectables Actually Are
Mounjaro (tirzepatide) and Wegovy (semaglutide) are both prescription-only medicines supplied as pre-filled injection pens and taken once a week. They are not interchangeable — they have different active substances and different mechanisms of action — and suitability is assessed by a prescriber based on an individual's full medical history.
How they are taken
Both medicines are injected subcutaneously (just under the skin) once a week, typically into one of three sites: the abdomen, the upper thigh, or the back of the upper arm. Rotating between sites with each injection is generally recommended to avoid irritation and allow the tissue to recover. Your prescriber or the patient information leaflet that came with your pen will guide you on the technique itself.
These are not the same as insulin
A common question is whether these jabs are a form of insulin — they are not. Mounjaro acts on both GIP and GLP-1 receptors, while Wegovy acts on GLP-1 receptors. Both are associated with effects on appetite regulation and a sense of fullness, though individual experiences vary considerably.
For a broader overview of how injectable weight-loss medicines work, see our guide to weight-loss injections. You may also find it useful to read about Mounjaro as a weight-loss jab or explore what a weight-loss jab involves in more detail.
What about jabs discussed in the news?
Media coverage often refers to a "new jab for weight loss" — if you have seen those reports and want to understand what is currently available on prescription, our page on the new jab for weight loss covers the landscape factually and neutrally. In all cases, access requires a prescription from a qualified healthcare professional.
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 You Stay on Top of Your Injections
Once you are prescribed a weekly injection, keeping track of which site you used last, whether your dose was logged, and when your next injection is due becomes a genuine weekly task — and it is easy to lose track, especially early in a new routine.
GLP Trackr is built specifically for people already on Mounjaro or Wegovy, and injection tracking is at its core. Every time you administer your dose, you can log the site you used — abdomen, thigh, or upper arm — and the app tracks your rotation history, suggesting which site to use next so you are not guessing or repeating the same spot. You can also log the dose strength and the date and time, so your full injection history is always in one place.
Alongside site rotation, dose reminders mean your weekly schedule stays on track — a gentle prompt so a dose is not quietly missed in a busy week.
If you ever do miss a dose, the right step is to check your patient information leaflet and contact your prescriber or doctor — not to adjust the timing or amount on your own. GLP Trackr lets you log a missed dose so you have an accurate record to discuss at your next appointment.
Your prescriber or doctor is always the right person to advise on anything related to your injection technique, dose, or schedule — GLP Trackr records your journey; it does not replace their guidance.
Log your injection sites, track your rotation, and never lose track of your weekly schedule — GLP Trackr is free to try for 7 days on the App Store and Google Play.
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 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.
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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.
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.
Both Mounjaro (tirzepatide) and Wegovy (semaglutide) are prescription-only injectable medicines used for weight management. Which is appropriate for any individual is a clinical decision made by a prescriber based on personal medical history — there is no universal "best" option.
Both Mounjaro and Wegovy are injected subcutaneously (under the skin) into the abdomen, upper thigh, or back of the upper arm. Rotating sites with each weekly injection is generally recommended. Your prescriber or the patient information leaflet will guide you on technique.
Yes, rotating between sites is generally recommended to reduce the risk of localised irritation and allow tissue recovery. The three commonly used sites are the abdomen, upper thigh, and upper arm. A tracking app like GLP Trackr can log each site and suggest where to inject next.
Weight-loss jabs like Mounjaro and Wegovy are prescription-only medicines. How and where they are prescribed varies by country and individual circumstances. Your prescriber or doctor is the right person to advise on access and eligibility in your situation.
If you miss a dose, check the patient information leaflet that came with your pen and contact your prescriber or doctor for guidance. Do not adjust your dose or timing without professional advice. You can log a missed injection in GLP Trackr to keep an accurate record for your next appointment.