The Main Weight Loss Injection Names and What They Are
Mounjaro and Wegovy are the two brand names most commonly associated with injectable weight management treatment. Here is a factual, neutral overview of each.
Mounjaro (tirzepatide)
Mounjaro contains the active substance tirzepatide, a dual GIP and GLP-1 receptor agonist. It is supplied as a pre-filled pen and is injected once weekly. Dose strengths typically referenced are 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, and 15 mg. The starting dose and any adjustments are always decided by your prescriber — not something to change on your own.
Wegovy (semaglutide)
Wegovy contains the active substance semaglutide, a GLP-1 receptor agonist. It is also a once-weekly pre-filled injection pen. Commonly referenced dose strengths include 0.25 mg, 0.5 mg, 1 mg, 1.7 mg, and 2.4 mg. As with Mounjaro, titration is led entirely by your prescriber based on your individual response and tolerance.
How they work
Both medicines act on appetite-regulating pathways — GLP-1 receptors influence feelings of fullness and slow gastric emptying, which many people experience as reduced appetite or less "food noise". Tirzepatide additionally acts on GIP receptors. These are factual descriptions of mechanism; how any individual responds will vary, and your prescriber is the right person to discuss what to expect.
It is worth noting that neither medicine is insulin, and neither is a cosmetic quick fix — they are prescription treatments used alongside dietary and lifestyle changes under clinical supervision.
For a broader overview of how these treatments are used, see our guide to weight loss injections. You may also find our page on what a weight loss injection involves useful background reading.
Both Mounjaro and Wegovy carry a black triangle (▼) designation in the UK, meaning they are subject to additional monitoring. Any side effects should be reported to your healthcare professional and to your national reporting scheme (such as the UK's Yellow Card scheme or the equivalent in your country).
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
Tracking the right four numbers — weight, waist, protein and dose — turns a noisy chart into a clear story. That's the loop GLP-1 users keep coming back for.
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Tracking Your Injection Journey with GLP Trackr
Once you know which medicine you have been prescribed, the practical challenge becomes staying consistent week after week — and that is exactly where GLP Trackr helps.
The most relevant feature for injection tracking is injection-site logging and rotation. Each time you inject, you record the site (abdomen, thigh, or upper arm) in the app. GLP Trackr keeps a rotation history and suggests your next site automatically, so you never have to remember which spot you used last week. Rotating sites is generally recommended to reduce irritation, and having an automatic prompt makes it effortless.
Alongside site tracking, dose logging lets you record the exact dose strength and the date and time of each injection — creating a clear, dated record you can bring to your prescriber appointments or review yourself. The app also sends gentle dose reminders so a weekly injection is never quietly forgotten.
If you are exploring whether your current medicine is the right fit, our comparison of which injection may suit different needs offers neutral, factual context — though any decision about your treatment always belongs with your prescriber or doctor.
For those who have questions about obtaining or starting treatment, our page on accessing weight loss injections explains how these medicines are generally prescribed and dispensed.
GLP Trackr helps you record your journey — it is not a substitute for the guidance of your prescriber, and any questions about your dose, your medicine, or side effects you are experiencing should always go to your healthcare professional first.
Ready to keep every injection logged and every rotation on track? Download GLP Trackr on the App Store or Google Play and start a free 7-day trial — no commitment needed.
What does glptrackr include?
10+ powerful features. One app. Built specifically for Mounjaro and Wegovy users.
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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.
You're Not on This Journey Alone.
Connect with thousands of real GLP-1 users sharing their wins, side effect tips, and meal ideas. Get the support of people who truly get it — because they're living it too.
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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.
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 two main prescription weight loss injections are Mounjaro (active substance tirzepatide) and Wegovy (active substance semaglutide). Both are once-weekly injectable medicines available only on prescription from a qualified healthcare professional.
Mounjaro contains tirzepatide, a dual GIP and GLP-1 receptor agonist, while Wegovy contains semaglutide, a GLP-1 receptor agonist. Both are once-weekly injections. Which is appropriate for you is a decision for your prescriber, based on your individual health and circumstances.
Rotating injection sites — between the abdomen, thigh, and upper arm — is generally recommended to reduce the chance of skin irritation. Your prescriber or the patient information leaflet for your medicine can advise on the best approach for you personally.
GLP Trackr lets you log each injection, including the dose strength, date, time, and injection site. The app tracks your rotation history and suggests your next site, and sends reminders so you never miss a weekly dose.
Both medicines are prescription-only and subject to clinical oversight. Suitability and safety for any individual is assessed by a prescriber. If you experience side effects or have concerns, contact your healthcare professional promptly — they are best placed to advise you.