Mounjaro Injection Doses: Understanding Your Weekly Schedule

Mounjaro is available in a range of pre-filled pen strengths. According to the electronic Medicines Compendium, the doses commonly used are 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, and 15 mg. Treatment is generally started at the lowest strength, with the prescriber deciding if and when to move to the next level — typically after several weeks at each stage. This gradual approach is designed to help your body adjust.

It is your prescriber's decision — not yours to make alone — when or whether your dose changes. If you have questions about where you are in your titration schedule, always raise them at your next appointment rather than adjusting anything yourself.

Injection Sites and Rotation

Mounjaro is injected under the skin (subcutaneously). The three most commonly used sites are the abdomen, the front of the thigh, and the upper arm. Rotating between sites with each weekly injection is generally recommended to reduce the chance of skin irritation or changes at any one spot. Your prescriber or the patient information leaflet that came with your pen is the right place to confirm the technique that is right for you — the notes here are general and informational, not a substitute for their guidance.

For a broader look at injection sites and how rotation works in practice, see our guide to Mounjaro injection sites and technique, or read about what to expect from your Mounjaro pen. You may also find it helpful to explore our overview of weight-loss injections for wider context on GLP-1 injectable medicines.

Keeping Your Pen Safe

Pre-filled Mounjaro pens have specific storage requirements — check the leaflet that came with your pen or the electronic Medicines Compendium entry for Mounjaro for the definitive guidance, as storage conditions (refrigeration, time at room temperature, light exposure) are product-specific and should not be guessed. Using a pen that has been stored incorrectly could affect its reliability.

Mounjaro carries a black triangle (▼) designation, meaning it is subject to additional monitoring. Any side effects you notice should be reported to your healthcare professional and to your national reporting scheme (such as the UK's Yellow Card scheme, or the equivalent in your country).

One of the most practical things you can do on a weekly injection schedule is keep a reliable log of every dose — and that is exactly where GLP Trackr starts. The app's injection-site tracking and rotation feature lets you record which site you used for each shot, and then suggests your next rotation automatically, so you never have to try to remember where you injected last week.

Alongside site tracking, the dose-logging feature stores the strength, date, and time of every injection in one place. Over weeks and months, that record becomes genuinely useful: you can see your full titration history at a glance, and the app's doctor report feature lets you bring a clear, organised summary to your prescriber appointments — no more trying to recall details from memory.

If you are wondering about sourcing or cost, it is worth knowing that GLP Trackr is a tracking app and does not sell, supply, or help you obtain Mounjaro. For questions about accessing the medication, your prescriber or a registered pharmacy in your country is the right place to start. You can find more general information on our pages about buying Mounjaro injections and where to buy Mounjaro, both of which explain what GLP Trackr can and cannot help with.

Any questions about your dose — including whether to change it, what to do if you miss an injection, or whether your current strength is right for you — belong with your prescriber or doctor. GLP Trackr helps you record your journey; it is not a substitute for their advice.

Ready to keep a proper record of every dose and injection site? Download GLP Trackr on the App Store or Google Play and start your free 7-day trial — your weekly injection schedule deserves a reliable home.