How These Injections Work and Where They Are Given
Wegovy and Mounjaro are both once-weekly, self-administered injections supplied as pre-filled pens. Wegovy contains semaglutide, a GLP-1 receptor agonist, while Mounjaro contains tirzepatide, which acts on both GLP-1 and GIP receptors. Both medicines work on appetite-regulating pathways, and many people report a reduced sense of hunger and greater feelings of fullness.
Common injection sites
The three sites most commonly used are the abdomen (stomach area), the front of the thigh, and the upper arm. Your prescriber or the patient information leaflet that came with your pen will give you guidance on technique specific to your medicine. What is important to know is that rotating between sites — rather than using the same spot each time — is generally recommended to allow the skin and tissue to recover.
Why rotation matters
Injecting repeatedly into the same area can cause skin changes such as lumps or hardened tissue, which may affect how the medicine is absorbed. A simple rotation pattern — moving around the abdomen, alternating thighs, or shifting between areas — helps keep each site in good condition. If you are unsure about the best rotation approach for you, speak with your prescriber or doctor.
For a broader overview of how these medicines are accessed and administered, see our guide to weight loss injections. You may also find it helpful to read about weight loss injections available through NHS pathways and the detail on who can get weight loss injections on the NHS.
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
Staying consistent with a weekly injection schedule — and rotating sites correctly — is easier when you have a record of what you have done. GLP Trackr's injection-site tracking feature lets you log each injection: the site you used (abdomen, thigh, or arm), the date, and the dose strength. The app then tracks your rotation history and suggests where to inject next, so you never have to try to remember which side of your abdomen you used last week.
Alongside site tracking, the dose reminder feature means you get a gentle nudge when your next injection is due — useful during the early weeks when a weekly schedule is still becoming a habit. Every dose you log becomes part of a clear history you can refer back to, or share as a summary with your prescriber at your next appointment.
If you notice anything at the injection site — redness, swelling, or discomfort — you can log that too, so you have an accurate record to discuss with your healthcare professional. Any concerns about your injection site or technique should always be raised with your prescriber or doctor; GLP Trackr records what you observe, but it is not a substitute for their guidance.
Ready to take the guesswork out of injection rotation? Download GLP Trackr on the App Store or Google Play and explore it free for 7 days — no commitment needed.
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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
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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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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.
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Frequently asked questions.
Wegovy (semaglutide) and Mounjaro (tirzepatide) are both prescription-only injectable medicines that may be available through some NHS-funded services in the UK, subject to individual eligibility. Your prescriber or doctor will determine whether you qualify based on clinical criteria.
Common injection sites are the abdomen, front of the thigh, and upper arm. Rotating between these sites each week is generally recommended to protect skin and tissue. Your prescriber or the leaflet with your pen will provide technique guidance specific to your medicine.
Injecting into the same spot repeatedly can cause skin changes such as lumps or hardened tissue, which may affect how the medicine is absorbed. Rotating sites regularly — moving around the abdomen or alternating legs and arms — helps keep each area in good condition.
GLP Trackr lets you log each injection, including the site used, date, and dose strength. The app tracks your rotation history and suggests your next site automatically, while dose reminders help you stay on your weekly schedule without having to remember manually.
Redness, swelling, or discomfort at an injection site is worth noting and discussing with your prescriber or doctor, especially if it is persistent or severe. Log what you observe in GLP Trackr so you have an accurate record to bring to your next appointment.