How Mounjaro is Generally Administered
Mounjaro (tirzepatide) is a once-weekly injectable medicine supplied as a pre-filled KwikPen. It is injected under the skin — a subcutaneous injection — rather than into a vein or muscle. The three sites most commonly described in prescriber guidance are the abdomen, front of the thigh, and upper arm.
Why rotation matters
Using the same spot repeatedly can cause the skin to become irritated or develop lumps (lipohypertrophy), which may affect how the medicine is absorbed. Rotating between sites — and within the same site — is generally recommended to keep skin healthy. Your prescriber or the official patient information leaflet will give you specific advice for your situation.
Following along with a video guide
Many people search for a video demonstration of weight loss injections such as Mounjaro because seeing the steps in motion is easier than reading them. If you are looking for a video walkthrough, the most reliable sources are your prescriber, the manufacturer's official resources, or the patient information leaflet included with your pen. Avoid informal online videos that may not reflect up-to-date guidance for your specific pen version.
For a more detailed written overview of the injection process, see our guide on using your Mounjaro injection, or read the broader step-by-step Mounjaro use guide for context on the full routine. There is also a practical overview in how to use Mounjaro that many people find useful alongside their leaflet.
A note on technique
This page does not replace clinical injection training. If you are unsure about any step — needle length, skin pinch technique, the angle of insertion, or how to handle a blocked pen — contact your prescriber or doctor directly. They know your full history and can walk you through it safely.
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
Once you are comfortable with the injection itself, keeping a reliable record of every dose is where GLP Trackr makes a real difference. The app's injection-site tracking and rotation feature lets you log exactly which site you used each week — abdomen, thigh, or upper arm — and the app tracks your rotation history so it can suggest where to inject next. That means you never have to try to remember where last week's dose went.
Alongside site tracking, the dose logging feature records the strength and date of every injection, giving you a clear timeline to refer back to. If you ever need to discuss your injection history at an appointment, the app's doctor report feature lets you bring a tidy summary to your prescriber rather than relying on memory.
The dose reminder function is another small but meaningful safeguard — a gentle nudge on your chosen day each week so a dose never quietly slips by.
If you experience any injection-site reactions — redness, itching, or discomfort — you can log these in the side-effect tracker and note patterns over time. Always share anything persistent or concerning with your healthcare professional promptly; GLP Trackr records the information so you can have a more informed conversation, but it is not a substitute for their advice.
For a broader look at all the topics covered on this site, the weight loss injections hub is a good starting point.
Keep your injection routine organised from day one — log your sites, track your rotation, and set a weekly reminder in GLP Trackr. It is free to try for 7 days on the App Store and Google Play.
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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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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 most reliable video guidance comes from your prescriber, the manufacturer's official resources, or the patient information leaflet in your pen packaging. Avoid unverified online videos, as they may not reflect current guidance for your specific pen version.
Mounjaro is typically injected subcutaneously into the abdomen, front of the thigh, or upper arm. Your prescriber or the patient information leaflet included with your pen will confirm the correct approach for your individual circumstances.
Rotating injection sites helps prevent skin irritation and lumps that can affect how the medicine is absorbed. Using the same spot repeatedly is generally not recommended. Your prescriber can advise on a rotation pattern that suits you.
GLP Trackr lets you log each injection site, dose strength, and date. It tracks your rotation history and suggests your next site, sends weekly dose reminders, and generates a summary you can share with your prescriber at appointments.
Minor redness or irritation at the injection site is commonly reported. If a reaction is severe, persists, or concerns you, contact your healthcare professional promptly. You can log injection-site reactions in GLP Trackr to track patterns and discuss them at your next appointment.