Where and How Mounjaro Injections Are Given
Mounjaro is injected subcutaneously (just under the skin) once a week. The three sites most commonly used are the abdomen, the front of the thigh, and the upper arm. Your prescriber or doctor, along with the patient information leaflet that comes with your pen, will guide you on the exact technique for your situation.
Why injection-site rotation matters
Using the same spot repeatedly can cause the tissue under the skin to change, which may affect how reliably the medicine is absorbed. Rotating between sites — and moving to a different area within the same site each time — helps keep the skin healthy and absorption consistent. Many people find it easy to lose track of where they last injected, especially week to week, which is where a simple log makes a real difference.
Mounjaro pen strengths
Mounjaro pens are available in a range of dose strengths — commonly 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, and 15 mg. Which strength you are using at any given time is determined by your prescriber, who will typically start at the lowest dose and adjust over time based on your individual response. The 15 mg pen is the highest available strength. Any questions about your current or future dose belong with your prescriber, not a tracking app.
For a broader look at how injectable weight-loss medicines work and what using them involves, see our guide to weight-loss injections. You may also find it useful to read about what to expect from the Mounjaro injection and how others navigate weight-loss injections day to day.
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
One of the most practical things GLP Trackr does is take the guesswork out of injection-site rotation. Each time you log a shot, you record the site you used — abdomen, thigh, or upper arm — and the app tracks your rotation history, then suggests where to inject next. Over weeks of weekly doses, that running record becomes genuinely useful.
Alongside site tracking, the app logs each dose strength and the date and time of every injection, so you always have a clear picture of where you are in your treatment schedule. Dose reminders mean a weekly shot is much less likely to slip your mind.
If you want to compare notes on the broader experience of weekly injections, our pages on managing weight-loss jabs and weight-loss injection tracking cover related ground.
Ready to keep a proper record of every injection? Download GLP Trackr free on the App Store or Google Play — your first 7 days are on us, and site-rotation suggestions start from your very first log.
GLP Trackr records your injections to support your journey — it is not a substitute for the guidance of your prescriber or doctor. If you have any concerns about injection-site reactions, technique, or your dose, always raise them with your healthcare professional promptly.
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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.
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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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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.
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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.
Mounjaro is injected under the skin (subcutaneously) into one of three common sites: the abdomen, the front of the thigh, or the upper arm. Your prescriber or doctor and the patient information leaflet will advise on the right technique for you.
Yes — rotating sites with each weekly injection helps keep skin and tissue healthy and supports consistent absorption. Most people move between the abdomen, thigh, and upper arm, and shift to a different spot within the same area each time.
Mounjaro pens are commonly available in 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, and 15 mg strengths. Which pen you use is decided by your prescriber based on your individual treatment plan — dose decisions are not something to make independently.
GLP Trackr logs each injection — date, dose strength, and site — and tracks your rotation history so it can suggest where to inject next. It also sends dose reminders so a weekly shot is less likely to be missed.
Mild redness or discomfort at the injection site is commonly reported. If a reaction is severe, spreading, or persists, contact your healthcare professional promptly. Your prescriber or doctor is the right person to advise on managing any injection-site concerns.