Injection Sites and Rotation: The Essentials
Mounjaro and Wegovy are both once-weekly injectable medicines supplied as pre-filled pens. The three sites most commonly used are the abdomen (avoiding the area immediately around the navel), the front or outer thigh, and the upper arm. Each of these areas has enough subcutaneous tissue for the short needle to reach comfortably.
Why rotation matters
Using exactly the same spot week after week can cause lipohypertrophy — a build-up of fatty tissue under the skin that may affect how the medicine is absorbed. Rotating between sites, and moving within a site each time, helps keep the skin in good condition. Many people find a simple pattern helpful: abdomen one week, thigh the next, upper arm the week after, and back to the start.
What your prescriber and the patient information leaflet cover
The patient information leaflet (PIL) that comes with your pen contains specific guidance on injection technique. This page covers the general principles of site choice and rotation; for the step-by-step procedure — needle length, angle, and anything specific to your pen — always follow the leaflet and any guidance your prescriber or doctor has given you. If you are unsure about any part of the injection process, contact your healthcare professional before your next dose.
For a broader look at how these medicines work as weekly injectables, see our overview of weight loss injections. You can also read more about the Mounjaro jab specifically, or find general guidance on weight loss jab use.
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 Injections
The most useful thing GLP Trackr does for injection days is take the memory work out of rotation. The app's injection-site tracker logs which site you used for each dose — abdomen, thigh, or upper arm — and suggests where to go next based on your history. There is no mental gymnastics required; you just open the app, confirm your injection, and it does the rotation thinking for you.
Alongside site tracking, the app logs the date, time, and dose strength of every injection. Over time this builds a clear record of your treatment history — something genuinely useful to bring to a prescriber appointment, especially if you have questions about how things are going. The built-in dose reminder feature means the weekly schedule stays on track even during a busy week, so a dose is far less likely to be missed.
If you ever do miss a dose, the right next step is to check your patient information leaflet and speak with your prescriber or doctor — they can advise based on your individual circumstances. GLP Trackr can log the gap so you have an accurate record to refer to in that conversation, but dose decisions always belong with your healthcare professional.
If you have experienced any disruption to your supply, our page on weight loss jab shortages covers what people in that situation commonly ask about.
Ready to make injection day simpler? GLP Trackr's site rotation tracker and dose log are free to explore — download the app on the App Store or Google Play and start a 7-day free trial today.
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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.
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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.
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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.
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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.
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Frequently asked questions.
The three commonly used sites are the abdomen (avoiding the area around the navel), the front or outer thigh, and the upper arm. Your patient information leaflet and prescriber will give you specific guidance for your pen and individual circumstances.
Yes, rotating sites is widely recommended. Using the same spot repeatedly can cause tissue changes under the skin that may affect comfort and absorption. Moving between the abdomen, thigh, and upper arm, and varying the exact spot within each area, helps keep the skin in good condition.
There is no single best site — suitability depends on the individual. The abdomen, thigh, and upper arm are all commonly used. Your prescriber or doctor can advise on what works best for you, and the guidance in your patient information leaflet applies to your specific pen.
Check the patient information leaflet that came with your pen and contact your prescriber or doctor for advice specific to your situation. Never double up on a dose without professional guidance. GLP Trackr lets you log the missed dose so you have an accurate record to discuss at your next appointment.
GLP Trackr logs each injection by site, date, time, and dose strength. Based on your history, the app suggests which site to use next, taking the guesswork out of rotation. Your full injection history is stored in one place, ready to share with your prescriber if needed.