An overview of the main weight loss injection types
Weight loss injections are prescription medicines that work on appetite-regulating pathways in the body. The two most commonly discussed at present are:
Mounjaro (tirzepatide)
Mounjaro is a once-weekly injectable medicine whose active substance is tirzepatide. It acts on two receptors — GIP and GLP-1 — that are involved in appetite regulation and blood-sugar control. It is supplied as a pre-filled pen and is typically started at a low dose, with any adjustment made by the prescriber over time.
Wegovy (semaglutide)
Wegovy is also a once-weekly injectable, with the active substance semaglutide. It works on the GLP-1 receptor to reduce appetite and increase feelings of fullness. Like Mounjaro, it is supplied as a pre-filled pen and titrated under prescriber supervision.
Older GLP-1 medicines
Semaglutide and other GLP-1 receptor agonists were originally developed for type 2 diabetes management before some formulations were approved for weight management. You may come across references to liraglutide (previously used in a weight-management dose under a different brand) or daily injectable options — these are distinct products with their own prescribing criteria. Any questions about which medicine is appropriate for you belong with your prescriber or doctor.
A note on safety
Because these are prescription-only medicines, questions about whether they are suitable — and for whom — are answered by a qualified prescriber, not by an app or a website. If you are curious about how safe weight loss injections are, that page covers the commonly reported considerations in more detail. For a broader overview of the landscape, our guide to weight loss injections is a good starting point.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Tracking your injection journey with GLP Trackr
Whichever medicine you have been prescribed, keeping an accurate record of your injections matters more than many people realise. Rotating injection sites — moving between the abdomen, thigh, and upper arm — helps avoid skin reactions at overused spots, and it can be surprisingly easy to lose track of where you last injected on a weekly schedule.
GLP Trackr's injection-site tracker is built specifically for this. Each time you log a shot, you record the site you used, and the app tracks your rotation history so it can suggest where to inject next — no more trying to remember whether you used your left or right side last week. Alongside site tracking, the dose logging feature keeps a clear record of every injection — the date, time, and dose strength — all in one place.
If you ever notice anything at an injection site that concerns you, or experience any symptoms you are unsure about, contact your healthcare professional promptly. GLP Trackr helps you record what you observe so you can share a clear picture at your next appointment — it is not a substitute for clinical advice.
You might also find it helpful to read about understanding the costs involved with weight loss injections or explore getting value from your prescription once you are already on treatment.
Log every injection, track your rotation, and keep your weekly routine on course — GLP Trackr is free to try for seven days on the App Store and Google Play.
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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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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.
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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.
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Frequently asked questions.
The most widely prescribed weight loss injections currently are Mounjaro (tirzepatide), a dual GIP and GLP-1 receptor agonist, and Wegovy (semaglutide), a GLP-1 receptor agonist. Both are once-weekly prescription-only injectables. Other GLP-1 medicines exist but have different prescribing indications.
There are several injectable medicines used in weight management. Mounjaro and Wegovy are the two most commonly prescribed for weight loss at present. Additional GLP-1 medicines exist, primarily for type 2 diabetes, but their use in weight management depends on individual prescribing decisions.
Media reports have frequently mentioned semaglutide (Wegovy) and tirzepatide (Mounjaro) in this context. Both are prescription-only medicines — their suitability for any individual is a matter for a qualified prescriber, regardless of who else may be using them.
Rotating injection sites is generally recommended to avoid skin reactions at overused spots. Common sites include the abdomen, thigh, and upper arm. Your prescriber or the patient information leaflet for your medicine will provide guidance specific to your prescription.
GLP Trackr lets you log each injection — recording the date, time, dose strength, and site used. The app tracks your rotation history and can suggest your next injection site, helping you stay consistent without having to rely on memory alone.