Mounjaro and Wegovy: The Injections by Name
Mounjaro and Wegovy are the two brand names most commonly referred to as the "new weight loss injections." Here is a factual overview of each:
Mounjaro (tirzepatide)
Mounjaro's active substance is tirzepatide. It is a dual GIP and GLP-1 receptor agonist, meaning it acts on two appetite-related hormone pathways. It is supplied as a pre-filled injection pen and is taken once a week. Dose strengths commonly referenced include 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, and 15 mg, with adjustments made by your prescriber over time.
Wegovy (semaglutide)
Wegovy's active substance is semaglutide. It is a GLP-1 receptor agonist and is also taken as a once-weekly injection via a pre-filled pen. Commonly referenced dose strengths range from 0.25 mg up to 2.4 mg, again adjusted by your prescriber at the appropriate intervals.
How they are similar
- Both are prescription-only medicines — they cannot be obtained without a prescription from a qualified prescriber.
- Both are injectable and taken once a week.
- Both act on appetite-regulating pathways, with many people commonly reporting a reduced sense of hunger and increased feelings of fullness.
- Neither is insulin, and neither is a cosmetic quick fix — they are used alongside dietary changes and physical activity under clinical supervision.
For a broader look at how these medicines are used, see our guide to weight loss injections. If you want to understand more about how they compare, our page on the new weight loss injection covers the topic in more detail. You may also find it useful to read about whether the new weight loss injections are considered safe, based on what is currently known.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Tracking Your Injection Journey with GLP Trackr
Once you are prescribed either Mounjaro or Wegovy, keeping track of your weekly injections becomes an important part of staying consistent. GLP Trackr's injection-site tracking and rotation feature lets you log exactly where you injected each week — abdomen, thigh, or upper arm — and the app suggests your next rotation site automatically. Rotating sites regularly is generally recommended, and having a clear log makes it easy to follow through.
Alongside site tracking, the app's dose logging feature lets you record each injection with its date, time, and dose strength, so you always have a clear record of where you are in your prescribed schedule. If you ever want to check back before a prescriber appointment, everything is in one place.
GLP Trackr also includes dose reminders — a simple prompt so a weekly injection does not slip your mind, especially during the early weeks when the routine is still forming.
You can also explore what the weight loss injection is called and how to make sense of the names used in different contexts.
GLP Trackr is a tracking and journaling app — it does not give medical advice, and any questions about your dose, injection technique, or suitability should always go to your prescriber or doctor. They know your full history and are the right person to guide those decisions.
Ready to keep a clear log of every injection? Download GLP Trackr on the App Store or Google Play and try it free for 7 days — no commitment needed.
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.
You're Not on This Journey Alone.
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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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Frequently asked questions.
The two most widely discussed new weight loss injections are Mounjaro (tirzepatide) and Wegovy (semaglutide). Both are prescription-only, once-weekly injectable medicines used for weight management under clinical supervision.
Mounjaro contains tirzepatide, a dual GIP and GLP-1 receptor agonist. Wegovy contains semaglutide, a GLP-1 receptor agonist. Both are once-weekly injections. Which is right for you is a decision for your prescriber, based on your individual circumstances.
Yes. Both Mounjaro and Wegovy are prescription-only medicines. They must be prescribed by a qualified prescriber and obtained through a registered pharmacy. They cannot be obtained without a prescription.
GLP Trackr lets you log each injection, including the dose strength, date, time, and injection site. It also suggests your next rotation site and sends reminders so you stay on your weekly schedule.
Common injection sites include the abdomen, thigh, and upper arm. Rotation between sites is generally recommended. Your prescriber or the patient information leaflet with your medicine will guide you on the right technique for your situation.