What Is a Weight Loss Injection Course — and How Do You Stay on Track?

When a prescriber initiates treatment with a GLP-1 or dual GIP/GLP-1 medicine like Mounjaro or Wegovy, they generally start at a low introductory dose. Over the following weeks and months, the dose may be adjusted — always at your prescriber's direction — to find the level that works for you. This stepped approach is a core part of how the course is structured, and it is the reason keeping a record of each injection matters so much.

Injection sites and rotation

Both Mounjaro and Wegovy are given as a subcutaneous (under-the-skin) injection, typically into the abdomen, front of the thigh, or upper arm. Rotating injection sites is important: using the same spot repeatedly can cause skin changes at the injection site. Your prescriber or the patient information leaflet that came with your pen will guide you on technique and site selection — that clinical guidance is theirs to give, not ours.

What you can control day-to-day is keeping track of where you injected last time so you know where to go next. Many people find this surprisingly easy to lose track of across a long course of weekly injections.

How long does a course last?

There is no single fixed duration that applies to everyone. Treatment length is an individual decision made between you and your prescriber, based on your progress, tolerability, and clinical circumstances. Some people continue for an extended period; others reach a maintenance phase. For a broader overview of how these medicines are used, see our guide to weight loss injections.

Common experiences during a course

It is common to notice changes in appetite, some gastrointestinal symptoms (particularly around dose adjustments), and gradual shifts in weight and energy over the course of treatment. These experiences vary considerably from person to person. If you are weighing up different options, our pages on starting a weight loss injection and on how different injectable medicines compare cover the informational background in more detail.

Completing a multi-month injection course is much easier when you are not relying on memory alone. The feature most directly useful here is injection-site tracking and rotation: each time you inject, you log the site in GLP Trackr, and the app uses that history to suggest where to go next. Over a course of dozens of weekly injections, that running record removes the guesswork entirely.

Alongside site tracking, dose logging gives you a timestamped history of every injection — dose strength, date, and time — so you always know exactly where you are in your course. Pair that with the app's dose reminders, and missing a weekly injection becomes far less likely, even during busy weeks.

Everything you log can be reviewed before a prescriber appointment, giving you an accurate picture of your course to date rather than trying to reconstruct it from memory. If you are curious about the access side of things, our page on obtaining your prescription covers what to expect from that process.

If you ever experience side effects or notice patterns during your course, logging them in the app means you have specific, dated notes to share with your healthcare professional — far more useful than a vague recollection.

Any questions about your dose, how long to continue, or whether to adjust your course should always go to your prescriber or doctor. GLP Trackr supports your record-keeping; it is not a substitute for their clinical guidance.

Ready to keep a proper record of your injection course? GLP Trackr's site-rotation tracker and dose log are free to explore — download on the App Store or Google Play and start a 7-day free trial today.