Semaglutide and Tirzepatide: The Two Leading Options
Wegovy (semaglutide) and Mounjaro (tirzepatide) are both once-weekly injectable medicines prescribed to support weight management alongside diet and increased physical activity. They are not interchangeable, and neither is suitable for everyone — suitability is always a decision for your prescriber or doctor.
How they work
Semaglutide works as a GLP-1 receptor agonist, acting on pathways involved in appetite regulation and feelings of fullness. Tirzepatide is a dual GIP and GLP-1 receptor agonist, meaning it acts on two of these pathways simultaneously. Many people experience a reduction in appetite and a quietening of what is sometimes called "food noise" — the persistent preoccupation with food. Slower stomach emptying is also commonly reported, though this effect often eases over time.
How they are taken
Both medicines are supplied as pre-filled injection pens and are self-administered, typically once a week. They are started at a low dose, with any adjustments made by the prescriber over time at a pace that suits each individual.
If you are weighing up the specifics of these two medicines, our guide to weight loss injections covers both in more detail, and you can also read a balanced look at what makes a weight loss injection suitable for different people. Any question about which medicine is right for you should be directed to your prescriber — that decision belongs with them, based on your full medical history.
For general background on how these medicines are used, our weight loss injections hub is a good starting point.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Staying Consistent Once You Are Prescribed
Once you have a prescription, the biggest practical challenge for many people is simply keeping track — knowing when you last injected, which site you used, and when your next dose is due. Missing or misremembering a dose is easy to do on a weekly schedule, and rotating injection sites consistently matters for comfort and skin health.
How GLP Trackr helps
GLP Trackr's injection-site tracking and rotation feature is designed precisely for this. Each time you inject, you log the site — abdomen, thigh, or upper arm — and the app keeps a rotation history so it can suggest your next site automatically. There is no guesswork, and no trying to remember where you injected three weeks ago.
Alongside site tracking, the app's dose logging lets you record each injection with the date, time, and dose strength, giving you a clear, searchable history. Gentle reminders mean a dose is far less likely to slip by unnoticed. If you ever do miss a dose, you can log it in the app to raise with your prescriber at your next appointment — dose decisions always belong with them, not with any app.
You can also explore what to consider once you have a prescription for further practical guidance on getting started.
If symptoms such as injection-site reactions, nausea, or anything else are concerning you, always contact your healthcare professional. GLP Trackr's side-effect log can help you record what you notice and bring a clear picture to that conversation — but the app is a tracking companion, not a substitute for clinical advice.
Ready to take the guesswork out of your weekly injection routine? GLP Trackr is free to try for seven days — download it on the App Store or Google Play and let it handle the rotation, reminders, and records for you.
What does glptrackr include?
10+ powerful features. One app. Built specifically for Mounjaro and Wegovy users.
Everything your GLP-1 journey needs. Free to try for 7 days.
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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The Most Advanced GLP-1 Brain Ever Built.
The first AI built exclusively for GLP-1 weight loss. Every insight, every meal plan, every prediction trained on one thing only: helping you get the most out of your medication.
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.
Semaglutide (Wegovy) and tirzepatide (Mounjaro) are currently the most widely prescribed once-weekly injectable medicines for weight management. Both are prescription-only, and a prescriber or doctor decides which, if either, is appropriate for an individual.
Semaglutide (Wegovy) acts on GLP-1 receptors, while tirzepatide (Mounjaro) acts on both GLP-1 and GIP receptors. Both are once-weekly injections used for weight management. Which is more suitable for you is a decision for your prescriber, based on your personal medical history.
Yes — rotating between sites such as the abdomen, thigh, and upper arm is generally recommended to support skin health and comfort. Your prescriber or the patient information leaflet supplied with your medicine can advise on technique and rotation for your specific pen.
Any decision about a missed dose belongs with your prescriber or doctor — do not double up or adjust your schedule without their guidance. You can log a missed dose in GLP Trackr to flag it at your next appointment, and refer to the patient information leaflet for your specific medicine.
GLP Trackr lets you log each injection — recording the site, dose strength, date, and time. It tracks your rotation history and can suggest your next injection site. Dose reminders help keep your weekly schedule on track.