Injecting Mounjaro into the Thigh: What to Know and How to Track It

Both Mounjaro and Wegovy are once-weekly subcutaneous injections, meaning they are delivered into the fatty tissue just under the skin. The outer, middle portion of the thigh is a commonly chosen site because it is easy to reach and has enough subcutaneous tissue for most people.

Why site rotation matters

Injecting repeatedly into the same spot can cause a condition called lipohypertrophy — a build-up of fatty tissue under the skin that can affect how the medicine is absorbed. Rotating between sites (and between different spots within the same site) helps prevent this. Many people follow a simple pattern: abdomen one week, thigh the next, upper arm the week after, then back to the start.

What about video guides?

Searching for a Mounjaro injection video or a Wegovy injection video is a very natural thing to do when you are new to self-injecting. Manufacturer-produced videos and guidance from your prescribing clinic are the most reliable sources for visual technique instruction, because they reflect the current product design and any updates. Your prescriber or doctor can also walk you through the process at your next appointment, and the official patient information leaflet included with your pen is always worth reviewing.

If you are looking for general information about the injection process for Mounjaro, the Mounjaro injection guide covers the basics in more detail. For Wegovy users, the Wegovy injection overview is a useful companion read. You can also find broader guidance on weight-loss injections and what to expect from injectable GLP-1 medicines generally.

Thigh injection: a few general points

• Use the outer, middle area of the thigh — not the inner thigh or the knee area.
• Avoid injecting into skin that is bruised, tender, or shows signs of a previous reaction.
• Alternate legs as part of your rotation routine.
• Always follow the specific instructions in your pen's patient information leaflet, as design details can vary between devices and dose strengths.

For questions about your specific pen or injection process, your prescriber or doctor is the right person to ask — they know your full history and can give personalised guidance.

Keeping track of which site you used last week — and which side of that site — is easy to forget, especially once self-injecting becomes routine. GLP Trackr's injection-site tracking feature is designed to remove that mental load entirely.

Each time you log a dose in the app, you record the site you used (abdomen, thigh, or upper arm) and which side. GLP Trackr then suggests your next site based on your personal rotation history, so you never have to remember — the app does it for you. You can also log the dose strength and the date and time of each injection, giving you a clear record to refer back to or bring to an appointment.

Dose reminders are built in too, so your weekly schedule stays on track even when life gets busy. If you want to explore how others approach the injection routine, the practical Mounjaro injection tips page has more detail worth reading alongside this one.

If you ever notice a persistent reaction at an injection site — redness, swelling, or lumpiness that does not settle — contact your healthcare professional promptly. GLP Trackr is a tracking tool to help you observe and record what is happening; it is not a substitute for clinical advice. Any concerns about your injection sites or technique should always be discussed with your prescriber or doctor.

Ready to take the guesswork out of rotation? Download GLP Trackr on the App Store or Google Play and get started with a free 7-day trial — log your first shot tonight and let the app suggest where to inject next week.