How Injectable Weight Loss Medicines Are Typically Scheduled
The most widely prescribed injectable medicines for weight management are designed for a once-weekly dosing schedule. Mounjaro (tirzepatide), a dual GIP and GLP-1 receptor agonist, and Wegovy (semaglutide), a GLP-1 receptor agonist, are both given as a single subcutaneous injection each week, on the same day each week where possible. This schedule is set by your prescriber and should not be changed without their guidance.
Common injection sites
For both medicines, the injection is typically given into a fatty layer just under the skin. Commonly used sites include:
- The abdomen (stomach area, avoiding the area directly around the navel)
- The front of the thigh
- The upper arm
Your prescriber or the patient information leaflet that came with your pen will describe the technique in detail — always refer to that guidance rather than general online sources.
Why rotation matters
Injecting into the same spot repeatedly can cause changes to the skin and tissue beneath it, which may affect how the medicine is absorbed. Rotating between sites — and within a site — is a standard practice for anyone on a once-weekly injectable. Many people find it easy to lose track of which site they used last, especially over a long treatment course. Keeping a simple log can make rotation automatic rather than guesswork. For a broader overview of injectable weight management medicines, see our guide to weight loss injections. You may also find it helpful to read about what a weight loss injection involves if you are new to the process.
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 Injection Schedule
The most relevant feature for anyone on a once-weekly injection is GLP Trackr's injection-site tracking and rotation tool. Each time you inject, you log the site you used — abdomen, thigh, or arm — and the app keeps a running history of your rotation. It can then suggest your next site, so you never have to try to remember where you injected three weeks ago.
Alongside site tracking, the app lets you log the date, time, and dose strength of every injection, and set a dose reminder so your weekly schedule stays consistent even when life gets busy. A missed or delayed injection is something to discuss with your prescriber — the app makes it easy to note it in your log and bring an accurate record to your next appointment.
If you are exploring your options or comparing what is available, our pages on choosing a weight loss injection and accessing a weight loss injection may be useful background reading alongside the advice of your own prescriber or doctor.
For a full picture of the injection side of your journey — and everything else, from food and weight to side effects and mood — visit the weight loss injections hub.
A note on safety: Any questions about your injection schedule, technique, or dose belong with your prescriber or doctor — they know your full medical history. If you experience a reaction at an injection site that is severe, spreading, or not settling, contact a healthcare professional promptly.
Ready to keep your rotation on track? Log your injection sites and get automatic next-site suggestions with GLP Trackr — available free on the App Store and Google Play, with a 7-day trial to get started.
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.
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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.
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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.
Most prescription weight loss injections currently in widespread use — including Mounjaro (tirzepatide) and Wegovy (semaglutide) — are once-weekly, not once daily. Your prescriber will confirm the correct schedule for the medicine you have been prescribed.
Common sites are the abdomen, front of the thigh, or upper arm. The exact technique is described in the patient information leaflet supplied with your pen. Your prescriber or pharmacist can also demonstrate the correct method.
Repeated injections into the same spot can affect the skin and underlying tissue, which may impact how the medicine is absorbed. Rotating between sites — and within a site — helps avoid this. Logging each site in an app makes rotation easy to track over time.
Any decision about a missed dose belongs with your prescriber or doctor — do not adjust your schedule without their advice. You can log the missed injection in GLP Trackr to keep an accurate record and discuss it at your next appointment.
Yes. GLP Trackr lets you log each injection site and dose, tracks your rotation history, and can suggest your next site. You can also set a weekly dose reminder so your schedule stays consistent.