Weight loss injections: what they are and how they are administered
Mounjaro and Wegovy are prescription-only, once-weekly injectable medicines supplied as pre-filled pens. Mounjaro contains tirzepatide, a dual GIP and GLP-1 receptor agonist, while Wegovy contains semaglutide, a GLP-1 receptor agonist. Both act on appetite-regulating pathways in the body, and both are started at a low dose and adjusted over time — always under the direction of your prescriber or doctor.
Where injections are given
Both medicines are injected subcutaneously (just under the skin). The three most commonly used sites are:
- Abdomen — avoiding the area directly around the navel
- Upper thigh — the front or outer part
- Upper arm — the outer area, if you can reach it comfortably
Your prescriber or the patient information leaflet that came with your pen will give you guidance specific to your medicine. If you are unsure about technique, always ask your prescriber or a qualified healthcare professional — that is not something a tracking app replaces.
Why injection-site rotation matters
Injecting into the same spot repeatedly can cause a buildup of tissue under the skin (lipohypertrophy), which may affect how the medicine is absorbed. Rotating between different sites — and varying the exact spot within each area — helps keep absorption consistent. Many people find it surprisingly easy to lose track of which site they used last, especially a week later.
If you are curious about how others approach their injection schedules, our guide to weight loss injections covers the broader picture, and you can find location-specific considerations on our slimming injections near me page. For questions about cost and access, see our pages on affordable weight loss injection options and choosing the right weight loss injection.
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.
AI Meal Tracking. Built for GLP 1 Appetites.
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How GLP Trackr helps you stay on top of your injection routine
Keeping a clear record of every injection — which site, which date, which dose — is one of the most practical things you can do on a weekly injectable. GLP Trackr's injection-site tracking and rotation feature logs each site you use and suggests your next one automatically, so you never have to rely on memory a week after your last shot.
Beyond site rotation, the app's dose logging means you have a timestamped record of every injection: dose strength, date, and time in one place. If you ever need to refer back — or bring a clear summary to a prescriber appointment — it is all there. The app also sends gentle dose reminders so a weekly injection does not quietly slip past a busy day.
If you are also interested in understanding the difference between available medicines, our semaglutide weight loss injections page offers a factual overview, and if you want to explore how research programmes work in this space, take a look at our page on clinical trials for weight loss injections.
GLP Trackr is a tracking and journaling companion — it is not a prescriber, a pharmacy, or a substitute for clinical advice. Any questions about your injection technique, dose, or schedule should go to your prescriber or doctor, who knows your full medical history. If you experience any side effects that are severe, persistent, or concern you, contact a healthcare professional promptly and report through your national reporting scheme (such as the UK's Yellow Card scheme).
Ready to take the guesswork out of injection-site rotation? Download GLP Trackr on the App Store or Google Play — it is free to try for your first 7 days.
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 injections such as Mounjaro and Wegovy are prescription-only medicines. They are obtained through a prescriber or doctor and dispensed by a registered pharmacy. GLP Trackr is a tracking app and does not supply or source medication — speak to a healthcare professional about access in your area.
Mounjaro and Wegovy are injected subcutaneously — just under the skin — into the abdomen, upper thigh, or outer upper arm. Your prescriber or the patient information leaflet with your pen will provide guidance specific to your medicine and situation.
Injecting into the same spot repeatedly can cause tissue changes under the skin that may affect how the medicine is absorbed. Rotating between different sites and varying the exact position within each area helps keep absorption consistent. GLP Trackr can log your sites and suggest your next rotation.
Yes. GLP Trackr logs each injection — including dose strength, date, time, and site — and suggests your next rotation. It also sends dose reminders so a weekly injection does not get missed. It is a tracking tool, not a medical service; always follow your prescriber's instructions.
Decisions about a missed dose belong with your prescriber or doctor — do not double up or adjust your schedule without their guidance. You can log a missed dose in GLP Trackr to keep your record accurate and bring it up at your next appointment. Check the patient information leaflet that came with your pen for general missed-dose guidance.