Prescription Weight Loss Injections: The Key Facts
The two most commonly prescribed injectable medicines for weight management are Wegovy (semaglutide) and Mounjaro (tirzepatide). Both are prescription-only, once-weekly injections — meaning they are not available without a prescription from a qualified healthcare professional.
How they work
Wegovy acts on GLP-1 receptors, pathways involved in appetite regulation and feelings of fullness. Mounjaro acts on both GLP-1 and GIP receptors, making it a dual-action medicine. Many people report a reduction in appetite and food preoccupation — often described as reduced "food noise" — though individual experiences vary.
How they are taken
Both medicines come as pre-filled injection pens and are typically self-administered once a week. Common injection sites include the abdomen, outer thigh, and upper arm. Rotating between sites with each injection is generally recommended to reduce the chance of skin reactions at any one spot — your prescriber or the patient information leaflet that came with your pen can guide you on this.
Dose titration
Both medicines are usually started at a lower dose and adjusted over time. Any changes to your dose are decisions made by your prescriber based on how you are responding — not something to adjust independently.
For a broader overview of how these injections are used, see our guide to weight loss injections. You may also find it useful to read about weight loss jabs available on prescription and compare options across our overview of commonly prescribed weight loss jabs.
According to NHS guidance, these medicines are prescribed alongside a reduced-calorie diet and increased physical activity, and are not a standalone treatment.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Staying Consistent With Your Injections Using GLP Trackr
Once you are prescribed a weekly injection, one of the most practical challenges is simply keeping track — which site you used last, whether your dose reminder fired, and how your body has been responding week to week.
GLP Trackr's injection-site tracking and rotation feature is built exactly for this. Each time you administer your dose, you log the site you used — abdomen, thigh, or upper arm — and the app keeps a rotation history so it can suggest where to inject next. Over a weekly schedule, it is surprisingly easy to lose track of which spot you last used; the app removes that guesswork.
Alongside site tracking, dose logging means every injection is recorded with the date, time, and dose strength, giving you a clear, searchable history. If you ever need to discuss your injection schedule with your prescriber, that record is ready to share. And if life gets busy, dose reminders mean your weekly injection stays on your radar — not something you realise you missed two days later.
You can explore how other users are managing their journeys in our guide to weight loss jabs and tracking.
GLP Trackr is free to try for 7 days — available on the App Store and Google Play. Log your first injection, set your rotation, and let the app handle the record-keeping from there.
GLP Trackr is a tracking tool, not a medical service. Always follow the guidance your prescriber has given you about injection technique, site selection, and dose. If you experience any injection-site reactions or side effects that concern you, contact your healthcare professional promptly. Any suspected side effects can also be reported to your national reporting scheme (such as the UK's Yellow Card scheme).
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.
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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.
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 loss medicines are Wegovy (semaglutide) and Mounjaro (tirzepatide). Both are once-weekly prescription-only injections. Which one is suitable for you is a decision made by your prescriber based on your individual health circumstances.
Common injection sites are the abdomen, outer thigh, and upper arm. Rotating between sites with each weekly dose is generally recommended to avoid reactions in any one area. Your prescriber or the patient information leaflet supplied with your pen will guide you on correct technique.
Yes, rotating injection sites is generally recommended when using weekly injectable medicines like Wegovy or Mounjaro. Repeatedly injecting the same spot can cause skin reactions. GLP Trackr can log each site and suggest your next rotation automatically.
GLP Trackr lets you log each dose — including the date, time, dose strength, and injection site. It tracks your rotation history and suggests where to inject next, and sends reminders so you do not miss your weekly schedule. It is a tracking tool, not a medical service.
Your prescriber decides your starting dose and any adjustments over time. These medicines are typically begun at a lower dose and titrated gradually. You should never change your dose independently — always follow the guidance of your prescriber or doctor.