What Are Prescription Weight Loss Injections and How Are They Taken?
Both Mounjaro and Wegovy are prescription-only medicines supplied as pre-filled injection pens and taken once a week. Mounjaro contains tirzepatide, a dual GIP and GLP-1 receptor agonist, while Wegovy contains semaglutide, a GLP-1 receptor agonist. Both act on appetite-regulating pathways in the body, and many people report a reduced sense of hunger and greater feelings of fullness while taking them.
Because these are prescription-only medicines, they are obtained through a registered prescriber and pharmacy — not over the counter. If you have questions about whether they are suitable for you or how your dose is managed, your prescriber or doctor is the right person to ask.
Injection Sites and Rotation
The most commonly used injection sites are the abdomen, the front of the thigh, and the upper arm. Rotating between sites with each weekly injection is generally recommended, as using the same spot repeatedly can cause skin changes at the injection site. Your prescriber or the patient information leaflet supplied with your pen will provide guidance specific to your medicine.
For a broader overview of how these medicines are used, the weight loss injections guide covers the key principles in more detail. You may also find it helpful to read about getting started with prescription injections and how other people navigate the early weeks of treatment.
Commonly Reported Experiences
Gastrointestinal side effects — such as nausea, constipation, or indigestion — are among the most commonly reported effects, particularly in the early weeks or after a dose adjustment. These often ease over time for many people, though experiences vary. If you are finding side effects difficult to manage, or if anything feels severe or persistent, speak with your healthcare professional promptly rather than adjusting your treatment on your own.
For more on what people commonly encounter during treatment, the page on navigating your injection journey offers practical context drawn from real user experiences.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Tracking Your Prescription Injection Journey with GLP Trackr
Staying consistent with a weekly injection schedule is one of the most important — and sometimes overlooked — parts of getting the most from your treatment. GLP Trackr is built specifically for people already on Mounjaro or Wegovy, and its injection-site tracking and rotation feature is one of the most practical tools it offers.
Each time you inject, you log the site you used — abdomen, thigh, or arm — and the app keeps a running record of your rotation history, then suggests where to inject next. This takes the guesswork out of rotation and helps you avoid overusing one area. Alongside site tracking, the app logs your dose strength and the date and time of each injection, so you always have a clear record to refer back to or share with your prescriber.
Dose reminders are another feature worth using: a gentle weekly notification means you are far less likely to accidentally miss an injection day, particularly during busy weeks or when your routine shifts. For a full picture of your journey, you can also log weight, mood, energy, and any side effects you notice — all in one place.
You can explore related topics such as managing your weekly injection routine to get more from your experience.
GLP Trackr is a tracking and journaling app — it is not a medical service, and nothing in the app replaces the guidance of your prescriber or doctor. Any questions about your dose, injection technique, or how your treatment is going should always be directed to your healthcare professional. If you ever experience side effects that feel severe, unusual, or persistent, contact your healthcare professional promptly. In your country there may also be a national scheme for reporting side effects of medicines (such as the UK's Yellow Card scheme) — your prescriber or pharmacist can advise on this.
Ready to take the guesswork out of injection rotation and keep your weekly schedule on track? GLP Trackr is free to try for 7 days — download it on the App Store or Google Play and see how it fits your routine.
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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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.
Prescription weight loss injections such as Mounjaro (tirzepatide) and Wegovy (semaglutide) are once-weekly injectable medicines that act on appetite-regulating pathways. They are prescription-only and must be obtained through a registered prescriber and pharmacy.
The most commonly used sites are the abdomen, front of the thigh, and upper arm. Your prescriber or the patient information leaflet supplied with your pen will give guidance specific to your medicine and dose.
Rotating the injection site each week helps prevent skin changes that can occur from repeatedly using the same spot. Most guidance recommends choosing a different site or area with each injection, as detailed in your medicine's patient information leaflet.
GLP Trackr lets you log each injection site and keeps a rotation history, then suggests where to inject next. This removes the guesswork and helps you stay consistent with rotation across your weekly schedule.
Common effects such as nausea or digestive discomfort often ease over time, but if anything feels severe, persistent, or worrying, contact your healthcare professional promptly. Never adjust your dose on your own — that decision belongs with your prescriber.