Types of Weight Loss Injections and What Makes Them Different
Several injectable medicines are currently used for weight management. The two most widely prescribed in this category are semaglutide (brand name Wegovy) and tirzepatide (brand name Mounjaro), both given as a once-weekly injection. You can read a detailed side-by-side breakdown on our guide to all weight loss injections, but here is a neutral overview of the main options.
GLP-1 receptor agonists
Semaglutide (Wegovy) works on GLP-1 receptors — pathways involved in regulating appetite and the rate at which the stomach empties. Many people report reduced appetite and lower "food noise" while taking it. Liraglutide is an older GLP-1 medicine sometimes prescribed for weight management; it is taken daily rather than weekly and is available under a different brand name for that indication.
Dual GIP and GLP-1 receptor agonists
Tirzepatide (Mounjaro) acts on both GLP-1 and GIP receptors. According to the electronic Medicines Compendium (eMC), this dual action is thought to contribute to its effects on appetite regulation and body weight. Like semaglutide, it is injected once weekly using a pre-filled pen.
What about other injections?
You may come across references to retatrutide, peptide-based products, lemon bottle injections, or vitamin B injections marketed for weight loss. It is important to distinguish between medicines that have been through rigorous regulatory review and products that have not. Always discuss any injectable product with your prescriber or doctor before using it, and use only medicines obtained through a registered pharmacy on a valid prescription. Our page on comparing weight loss injection options looks at this topic in more detail.
Who can be prescribed a weight loss injection?
Eligibility criteria vary by country, healthcare system, and individual clinical circumstances. Factors such as BMI, the presence of weight-related health conditions, and medical history all play a role. Your prescriber or doctor is the right person to discuss whether a particular medicine is appropriate for you. For more on eligibility factors, see our page on BMI thresholds and weight loss injections.
Important safety notes
These are prescription-only medicines. Commonly reported side effects include nausea, vomiting, diarrhoea, constipation, and injection-site reactions. More serious but less common concerns — including effects on the gallbladder, pancreas, and thyroid — are described in the patient information that comes with your medicine. If you experience severe or persistent symptoms, contact your healthcare professional promptly. Any questions about stopping, switching, or changing your medicine belong with your prescriber, not a website.
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 Injections
One of the most practical challenges of a weekly injectable routine is keeping track of where you have injected. Rotating sites — typically between the abdomen, thigh, and upper arm — is generally recommended to avoid tissue changes at any one spot, and it is easy to lose track of where you last injected, especially week to week.
GLP Trackr's injection-site tracker lets you log each site after every dose and shows your rotation history at a glance, so you always know where you injected last and where to go next. The app also logs the dose strength and date of each injection, giving you a clear record you can refer back to — or bring to an appointment with your prescriber. Pair that with the built-in dose reminder, and forgetting a weekly injection becomes much less likely.
GLP Trackr is a companion app for people already prescribed Mounjaro or Wegovy — it does not supply, sell, or source any medicine. For guidance on how to get the most from your prescribed treatment, visit our weight loss injections hub, or explore practical tips for self-injecting and what to look for when considering getting value from your treatment.
Always follow the guidance of your prescriber or doctor — they know your full history and are best placed to advise on your treatment. GLP Trackr helps you record your journey so those conversations are better informed; it is not a substitute for clinical advice.
Ready to take the guesswork out of injection-site rotation? GLP Trackr is available free on the App Store and Google Play, with a 7-day trial to get you started — log your first shot today.
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.
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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.
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 prescription weight loss injections include semaglutide (Wegovy) and tirzepatide (Mounjaro), both taken once weekly. Liraglutide is an older daily option. Which medicine is appropriate for any individual is a decision for their prescriber or doctor, based on clinical circumstances.
Some medicines used for weight management — such as semaglutide and tirzepatide — were originally developed or are also used in diabetes treatment, but the specific formulations and approved doses for weight management differ. Your prescriber will clarify which medicine and indication applies to your prescription.
Suitability depends on individual medical history, current medicines, and other factors assessed by a prescriber. These medicines are not suitable for everyone. People with certain thyroid conditions, a history of pancreatitis, or who are pregnant are among those for whom caution or avoidance may apply — always discuss your full history with your doctor.
Any decision about stopping or pausing your medicine should be made with your prescriber or doctor, not independently. They can advise on the right approach based on your individual situation and treatment goals.
GLP Trackr lets you log each injection — recording the site (abdomen, thigh, or upper arm), dose strength, and date — and tracks your rotation history so you always know where to inject next. Dose reminders help keep your weekly schedule on track.