What to Do Before Your First Injection
Preparation covers a few practical areas: storing your pen correctly, setting yourself up on injection day, and understanding the basic routine so there are no surprises.
Storing your pen correctly
Mounjaro pens should be stored in the refrigerator until you are ready to use them. Before injecting, it is generally recommended to let the pen come to room temperature for a short time — check the patient information leaflet that came with your pen for the specific guidance, as the exact timing and storage conditions are stated there. Never freeze the pen, and keep it out of direct sunlight.
Getting to know your pen
Before injection day, it helps to read through the leaflet and familiarise yourself with how the Mounjaro pen works — the cap, the window, and the plunger. Some people also find it useful to understand how to prime the Mounjaro pen before use, as this is a step your prescriber or the leaflet may ask you to perform.
Choosing your injection site
The three commonly used sites are the abdomen (stomach area), the front of the thigh, and the upper arm. Rotating between sites with each weekly dose is important for skin health and consistent absorption. Your prescriber will advise you on the sites suitable for you. Note that Mounjaro pens are pre-filled and do not require a separate syringe — if you have any questions about supplies, see the guidance on syringes and Mounjaro.
Setting a consistent day
Because Mounjaro is a once-weekly injection, choosing a fixed day of the week and sticking to it makes your routine easier to maintain. Pick a day that suits your schedule and set a reminder so you do not accidentally miss a dose. If you ever do miss a dose, contact your prescriber or doctor for guidance on what to do next — never adjust your schedule on your own.
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One of the most practical things GLP Trackr does is take the guesswork out of your weekly injection routine. The app's dose logging feature lets you record each injection — the date, time, and dose strength — so you always have a clear record of where you are in your treatment. On the injection side, the injection-site tracker logs which site you used last and suggests your next rotation, so you never have to remember manually.
As you settle into your routine, you can also use the dose reminder to get a gentle nudge on your chosen injection day each week — a simple way to make sure a dose is never forgotten.
All of this sits in one place alongside your weight, food, and wellbeing logs, so when you have an appointment with your prescriber you can bring a clear picture of your journey rather than trying to piece it together from memory. You can read more about the full Mounjaro tracking experience on the Mounjaro companion guide.
Always follow the preparation and administration guidance given by your prescriber or doctor, and refer to the patient information leaflet supplied with your pen — GLP Trackr is here to support your journey, not to replace that clinical advice.
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Frequently asked questions.
Mounjaro pens should be kept refrigerated until needed. Before injecting, allow the pen to reach room temperature — check the patient information leaflet that came with your pen for the exact recommended time. Do not freeze the pen or expose it to direct sunlight.
Some pens require priming before first use. Check your patient information leaflet or ask your prescriber for the specific steps for your pen. The leaflet will confirm whether priming is needed and how to do it correctly.
Mounjaro is commonly injected into the abdomen, front of the thigh, or upper arm. It is important to rotate the site with each weekly dose. Your prescriber will advise on the sites most suitable for you and your individual circumstances.
Any decision about a missed dose should be made with your prescriber or doctor — never adjust your schedule on your own. GLP Trackr lets you log a missed dose so you have an accurate record to discuss at your next appointment.
GLP Trackr lets you log each injection, track which site you used, and set weekly dose reminders — so your routine is organised from the very first dose. It is a tracking companion, not a substitute for your prescriber's guidance.