The Main Types of Weight Loss Injection: What the Names Mean
The injectable medicines most commonly associated with weight management today belong to a class that acts on appetite-regulating hormones. Here is a factual overview of the main ones currently prescribed.
GLP-1 receptor agonists
GLP-1 (glucagon-like peptide-1) receptor agonists work by mimicking a natural gut hormone involved in appetite regulation and blood-sugar control. They are associated with increased feelings of fullness and reduced appetite — effects that many people describe as quieting "food noise." The best-known name in this group for weight management is Wegovy (semaglutide), a once-weekly injectable supplied as a pre-filled pen.
Dual GIP and GLP-1 receptor agonists
A newer development is the dual-acting class, which targets both GLP-1 and GIP (glucose-dependent insulinotropic polypeptide) receptors. Mounjaro (tirzepatide) is the most widely prescribed medicine in this group for weight management. It is also a once-weekly injectable, supplied as a pre-filled pen or KwikPen device.
Are all weight loss injections the same?
No — while Mounjaro and Wegovy share some similarities (both are weekly injectables that act on appetite pathways), they have different active substances and different mechanisms. Other older injectable medicines, such as those used primarily in type 2 diabetes management, also exist but are not the focus here. Which medicine is appropriate for any individual is a clinical decision made by a prescriber, based on that person's full medical history and circumstances.
For a broader look at these medicines and how they are used, see our guide to weight loss injections. If cost is something you are thinking about, our pages on weight loss injection pricing considerations and finding value in your weight loss injection may also be useful — though note that GLP Trackr does not sell or supply any medicine, and we never quote prices.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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How GLP Trackr Helps You Stay on Top of Your Injection Routine
Whichever injectable medicine you have been prescribed, keeping track of your rotation sites is one of the most practically important habits to build — and it is easy to lose track of over weeks and months of weekly injections.
GLP Trackr's injection-site tracking feature lets you log each site you use (abdomen, thigh, or upper arm) and see your rotation history at a glance. The app uses that history to suggest your next site automatically, so rotation becomes something you never have to think hard about. Alongside that, the dose logging feature records each injection with its date, time, and dose strength, giving you a clear, time-stamped record to refer back to — and to bring to your prescriber appointments if needed. Dose reminders mean your weekly schedule stays on track even when life gets busy.
If you ever have questions about your injection technique, your dose, or whether a site reaction needs attention, always follow the guidance of your prescriber or doctor — they know your full medical history and can give you advice specific to your situation. GLP Trackr helps you record and organise the details of your journey; it is not a substitute for clinical advice.
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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.
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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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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 most commonly prescribed weight loss injections today include GLP-1 receptor agonists such as Wegovy (semaglutide) and dual GIP/GLP-1 receptor agonists such as Mounjaro (tirzepatide). Both are once-weekly prescription-only injectables. Other injectable medicines also exist; suitability is decided by a prescriber.
No. They differ in active substance, mechanism, dose schedule, and who they are suitable for. Mounjaro (tirzepatide) acts on both GIP and GLP-1 receptors; Wegovy (semaglutide) acts on GLP-1 receptors only. The right medicine for any individual is a decision for their prescriber or doctor.
Check the label on your pen or the patient information leaflet included in your pack. Your prescriber or pharmacist can also confirm the name, active substance, and dose strength of the medicine you have been given.
GLP Trackr is built for people already prescribed Mounjaro (tirzepatide) or Wegovy (semaglutide). You can log your injection site, dose strength, date, and time for either medicine, and the app tracks your rotation history to suggest your next site.
Common injection sites include the abdomen, upper thigh, and upper arm — but always follow the instructions in your medicine's patient information leaflet and any guidance from your prescriber or doctor. Rotating sites is generally recommended to avoid skin reactions at any one spot.