Mounjaro's Once-Weekly Schedule: What You Need to Know
Each Mounjaro dose is given as a single subcutaneous injection once every seven days. Your prescriber will typically start you on a lower dose strength and adjust it over time — that titration schedule is individual to you and should always be guided by your prescriber or doctor, not changed on your own.
Choosing your injection day
You can generally choose whichever day of the week suits your routine best, provided you stay consistent and leave roughly seven days between doses. Many people pick a day that is easy to remember — for example, a day with a regular event or commitment. If you need to shift your injection day by a day or two, speak with your prescriber or doctor first rather than adjusting the interval yourself.
Where the injection goes
Mounjaro is injected under the skin (subcutaneously) into fatty tissue. The three commonly used sites are the abdomen, the front of the thigh, and the upper arm. Rotating between sites each week — rather than always using the same spot — helps keep the skin healthy. For more detail on sites and how to vary them, see our guide on where to inject Mounjaro and our broader look at how often weight-loss injections are given.
Staying on schedule
Consistency matters. Taking your injection on the same day each week helps maintain steady levels of the medicine in your body. If you realise you have missed a dose, refer to the patient information leaflet that came with your pen, and contact your prescriber or doctor — never double up or adjust your next dose without their guidance. You can also read more in our page on how often to inject Mounjaro for additional context.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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How GLP Trackr Helps You Stay on Your Weekly Schedule
Keeping track of a once-weekly injection across months of treatment — including which site you used last time and whether your next dose day is approaching — is exactly what GLP Trackr is built to help with.
The app's injection-site tracking and rotation feature lets you log each injection: the date, the dose strength, and the site you used. GLP Trackr then keeps a rotation history and suggests your next site automatically, so you never have to remember which area you injected into last week. Pair that with dose reminders and you have a simple system that means your weekly schedule stays front of mind — without relying on memory alone.
Everything you log builds a clear record you can refer back to, or bring to your next prescriber appointment. The app's doctor report feature turns your injection log into a tidy summary, making those conversations easier.
For a wider view of tracking your injection journey, visit our weight-loss injections hub.
GLP Trackr is a tracking companion — it is not a substitute for your prescriber's advice. Any questions about your dose, your schedule, or your injection technique should always be directed to your prescriber or doctor, who knows your full medical history.
Ready to keep your weekly schedule on track? Download GLP Trackr on the App Store or Google Play and start a free 7-day trial — log your first injection today and let the app handle the rotation reminders from there.
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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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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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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.
Mounjaro is injected once a week — one dose every seven days, ideally on the same day each week. The schedule is set by your prescriber, who will also guide any dose adjustments over time.
It may be possible to shift your injection day slightly, but you should speak with your prescriber or doctor before doing so. The gap between doses matters, and any change should be made with their guidance rather than on your own.
If you miss a dose, check the patient information leaflet that came with your pen and contact your prescriber or doctor for advice. Never take a double dose or adjust your next injection without professional guidance.
Yes — rotating between sites (abdomen, thigh, and upper arm are commonly used) each week helps maintain skin health. Using the same spot repeatedly can cause irritation. GLP Trackr can log your sites and suggest the next rotation.
Yes. GLP Trackr lets you log each weekly dose, set injection-day reminders, and track site rotation. It keeps a history you can review or share with your prescriber — though it does not replace their medical advice.