An overview of prescription weight loss injections
Prescription weight loss injections in current use broadly fall into two categories based on how they act in the body. Both are given as a subcutaneous injection — beneath the skin — once a week using a pre-filled pen device.
GLP-1 receptor agonists
These medicines mimic a naturally occurring hormone called GLP-1 (glucagon-like peptide-1), which plays a role in regulating appetite and feelings of fullness. Semaglutide, available under the brand name Wegovy for weight management, belongs to this group. It is commonly reported to reduce appetite and food-related thoughts, sometimes described as lowering "food noise", as well as slowing the rate at which the stomach empties — an effect that often becomes less pronounced over time.
Dual GIP and GLP-1 receptor agonists
Tirzepatide, available as Mounjaro, acts on two receptors: GIP (glucose-dependent insulinotropic polypeptide) as well as GLP-1. This dual mechanism is what distinguishes it from GLP-1-only medicines. Many of the commonly reported effects — reduced appetite, increased fullness, slower gastric emptying — are broadly similar, though both medicines are individual in how they are experienced.
What they are not
Neither type is insulin, and neither is a cosmetic quick fix. Both are prescription-only medicines, which means suitability is assessed and decided entirely by a prescriber. They are intended to be used alongside dietary changes and physical activity, under clinical supervision.
For a broader look at this topic, the weight loss injections guide covers the wider landscape in more detail. You can also read about the risks associated with weight loss injections and explore a closer look at the specific types of weight loss injections available.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Keeping track of your injections with GLP Trackr
Once you are prescribed a weekly injectable medicine, one of the most practical challenges is staying on top of your injection-site rotation. Repeatedly using the same spot can affect how the medicine is absorbed, so moving between sites — abdomen, thigh, upper arm — is generally recommended. GLP Trackr's injection-site tracking logs each site you use and suggests your next rotation automatically, so you never have to remember where you last injected.
Alongside site tracking, the app logs every dose and the date and time it was given — useful both for your own records and for bringing a clear picture of your schedule to prescriber appointments. If you ever want to note how you felt after a particular injection, the side-effect log lets you record symptoms and spot patterns over time.
If you want to keep a full record of your weekly injection routine in one place, GLP Trackr is available free to try for 7 days on the App Store and Google Play — log your sites, track your doses, and bring clearer data to your next appointment.
A note on safety: if you have any questions about how to administer your injection, which sites to use, or how to handle your pen device, always follow the guidance in the patient information leaflet supplied with your medicine and speak with your prescriber or doctor — they are best placed to advise based on your individual circumstances.
What does glptrackr include?
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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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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 main types currently in use are GLP-1 receptor agonists, such as semaglutide (Wegovy), and dual GIP/GLP-1 receptor agonists, such as tirzepatide (Mounjaro). Both are once-weekly subcutaneous injections available only on prescription.
Wegovy contains semaglutide, which acts on GLP-1 receptors. Mounjaro contains tirzepatide, which acts on both GIP and GLP-1 receptors. Which medicine is suitable for a particular person is a decision for their prescriber, based on their individual health history.
Rotating the injection site each week is generally recommended to support consistent absorption and reduce skin reactions. Common sites are the abdomen, thigh, and upper arm. Your prescriber or the patient information leaflet with your medicine will provide specific guidance.
GLP Trackr's injection-site tracking feature logs each site you use and suggests your next rotation automatically, so you always know where to inject next without having to remember manually.
Suitability is assessed individually by a prescriber and these medicines are not appropriate for everyone. If you have questions about whether a particular injection is right for you, speak with your prescriber or doctor — they can advise based on your full medical history.