What Are These Weight Loss Injections and How Are They Taken?
Mounjaro (tirzepatide) and Wegovy (semaglutide) are both prescription-only, once-weekly injectable medicines used alongside a reduced-calorie diet and increased physical activity. Mounjaro acts on both GIP and GLP-1 receptors; Wegovy acts on GLP-1 receptors. Both come as pre-filled pens and are injected under the skin — a process your prescriber or pharmacist will have guided you through when you started treatment.
Common Injection Sites
The three most commonly used injection sites are:
- Abdomen — the area around (but not directly on) the navel
- Front of the thigh
- Upper arm — outer area
Rotating between sites with each injection is generally recommended to help avoid irritation or changes to the skin at any one spot. Your prescriber or doctor can advise on the best approach for your individual circumstances, and the patient information leaflet that came with your pen is the authoritative source for technique guidance.
Prescription and Access
Both medicines are available only on prescription. How and where you access them will depend on your individual situation and the healthcare system in your country. For information on how prescriptions and pharmacies work in your area, speak with your prescriber or doctor directly — see our overview of how weight loss jabs are accessed through pharmacies and national health services for general context. If you want a broader introduction to injectable weight loss medicines, our guide to weight loss injections covers the wider landscape.
Commonly Reported Side Effects
Gastrointestinal effects — such as nausea, constipation, or indigestion — are among the most commonly reported experiences, particularly after a dose change. These often ease over time for many people. Any side effects that are severe, persistent, or concern you should be discussed with your healthcare professional promptly. If you experience a suspected side effect, you can report it through your national reporting scheme (such as the UK's Yellow Card scheme).
For more detail on Mounjaro specifically, see our page on weight loss jabs with Mounjaro.
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
Staying consistent with a weekly injection — and rotating sites correctly — is one of the most practical challenges people face early in their journey. GLP Trackr's injection-site tracking and rotation feature is built exactly for this: log each injection with the site you used, and the app will track your rotation history and suggest where to inject next, so you never have to remember it yourself.
Alongside site tracking, the app's dose reminder means your weekly schedule stays on track without relying on memory alone — a genuinely useful safety net when life gets busy. You can also log how you feel after each injection using the side-effect tracker, building a picture of your own patterns over time that you can bring to your next appointment.
GLP Trackr does not replace the guidance of your prescriber or doctor — any questions about your injection technique, dose, or side effects should always go to them first. What the app does is help you keep a clear, organised record so those conversations are better informed.
For a full overview of tracking your injectable weight loss medicine journey, visit our weight loss injections hub. You can also explore more about weight loss jabs and how people are using them alongside tracking tools.
Ready to keep every injection, site, and symptom in one place? GLP Trackr is available free on the App Store and Google Play — start your 7-day free trial and see how much easier consistency becomes.
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.
Weight loss jabs such as Mounjaro (tirzepatide) and Wegovy (semaglutide) are prescription-only, once-weekly injectable medicines. They are injected under the skin, typically into the abdomen, thigh, or upper arm, using a pre-filled pen. Your prescriber will guide you on technique.
Rotating injection sites with each weekly dose is generally recommended to help prevent skin irritation at any single spot. Common sites include the abdomen, front of the thigh, and upper arm. Your prescriber or the patient information leaflet that came with your pen can advise further.
That decision belongs with your prescriber or doctor, who will consider your full medical history and circumstances. Mounjaro (tirzepatide) and Wegovy (semaglutide) work via different but related mechanisms; neither can be recommended over the other without individual clinical assessment.
GLP Trackr lets you log each injection — including the site used — and tracks your rotation history to suggest where to inject next. It also sends dose reminders and allows you to log side effects, helping you build a record to discuss with your prescriber.
Common side effects such as nausea often ease over time. If symptoms are severe, persistent, or worrying, contact your healthcare professional promptly. Suspected side effects can also be reported through your national reporting scheme (such as the UK's Yellow Card scheme).