Understanding the Names: Weight Loss Jabs Explained
Mounjaro and Wegovy are the brand names most often meant when people talk about weight loss jabs. They belong to a class of medicines known as GLP-1 receptor agonists — and Mounjaro goes a step further as a dual GIP and GLP-1 receptor agonist. Their active substances, tirzepatide and semaglutide respectively, act on appetite-regulating pathways, commonly resulting in a reduced sense of hunger and an increased feeling of fullness after eating.
You may also encounter the term "GLP-1 injection" used as a general label for this type of medicine. It is worth knowing the distinction between brand name (Mounjaro or Wegovy), active substance (tirzepatide or semaglutide), and the broader drug class (GLP-1 receptor agonist) — your prescriber or doctor will use all three at different times.
How they are taken
Both medicines are supplied as pre-filled injection pens and are administered once a week. They can be injected into the abdomen, thigh, or upper arm. Because the same site should not be used repeatedly, rotating between areas is generally recommended — your prescriber or doctor will advise you on the approach that suits your circumstances.
Are weight loss jabs safe?
As with any prescription medicine, suitability and safety depend entirely on the individual. These medicines are prescription-only precisely because a qualified clinician must assess whether they are appropriate for you. If you have questions about whether a weight loss injection is safe for your situation, that conversation belongs with your prescriber or doctor — they have your full medical history and are best placed to advise you.
For a broader overview of how these medicines work and what to expect, visit our guide to weight loss injections. You may also find it useful to read about the weight loss jab in more detail, or explore information on whether weight loss injections are available through public healthcare schemes in different countries.
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
Once you are prescribed a weekly injection, keeping track of which site you used last — and when your next dose is due — quickly becomes part of your routine. GLP Trackr's injection-site tracking and rotation feature lets you log each injection, recording the site (abdomen, thigh, or upper arm), and the app keeps a history so it can suggest where to inject next. That means one less thing to remember each week.
Alongside site rotation, the app's dose reminders can be set to nudge you on your chosen injection day, so a dose is never accidentally missed. If you do miss one, log it in the app and bring that record to your next appointment — any decision about what to do belongs with your prescriber, not something to decide alone.
GLP Trackr is a tracking companion, not a medical service. It is designed to help you stay consistent and organised — and to give you a clear record to discuss with your healthcare professional when you need to.
If you are curious about the cost side of these medicines, our pages on how much weight loss jabs cost and how much weight loss injections cost provide neutral background information.
Always follow the guidance of your prescriber or doctor — they know your full history and are the right person to advise on your injection schedule and any concerns that arise.
Ready to keep your injection routine on track? Download GLP Trackr on the App Store or Google Play and start a free 7-day trial — log your first injection site today and let the app handle the rotation reminders from there.
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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
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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.
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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.
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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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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.
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Frequently asked questions.
The most commonly prescribed weight loss injections are Mounjaro (tirzepatide) and Wegovy (semaglutide). Both are prescription-only, once-weekly injectable medicines. They are often referred to informally as weight loss jabs or GLP-1 injections.
Mounjaro contains tirzepatide, a dual GIP and GLP-1 receptor agonist. Wegovy contains semaglutide, a GLP-1 receptor agonist. Both are once-weekly injections, but they have different active substances. Which is appropriate for you is a decision for your prescriber or doctor.
Safety depends on your individual health profile, which is why these medicines are prescription-only. A prescriber or doctor must assess suitability before they can be prescribed. If you have concerns about safety, speak with your healthcare professional — they are best placed to advise you.
Weight loss injections such as Mounjaro and Wegovy are typically injected into the abdomen, thigh, or upper arm. Rotating between sites each week is generally recommended. Your prescriber or doctor will guide you on injection technique and rotation.
GLP Trackr lets you log each injection — recording the date, dose strength, and site used. The app tracks your rotation history and can suggest the next site, plus send dose reminders. It is a tracking tool, not a medical service.