What is tirzepatide and how does Mounjaro work?
Tirzepatide is the active substance in Mounjaro. Unlike older injectable weight-management medicines that act on a single pathway, tirzepatide is a dual GIP and GLP-1 receptor agonist — meaning it acts on two appetite-regulating pathways in the body simultaneously. According to information held in the electronic Medicines Compendium (eMC), tirzepatide is supplied as a pre-filled injection pen and is taken once weekly.
In practical terms, many people prescribed Mounjaro report a reduced sense of hunger and less preoccupation with food — sometimes described as quieter "food noise" — alongside a feeling of fullness that comes on sooner during meals. These are commonly reported experiences; individual responses vary, and the medicine is always prescribed and overseen by a healthcare professional.
How tirzepatide is typically used
Mounjaro is started at a low dose, with the prescriber adjusting the strength over time based on how well it is tolerated and how the individual responds. The available dose strengths are commonly referenced as 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, and 15 mg — but any decision about which strength is right for you belongs entirely with your prescriber or doctor. The medicine is subject to additional monitoring, and any side effects should be reported to your healthcare professional and to your national reporting scheme (such as the UK's Yellow Card scheme).
Tirzepatide as an injection
Mounjaro is given as a subcutaneous injection — typically into the abdomen, thigh, or upper arm. Rotating the injection site from one week to the next is generally recommended to support skin health at the injection area; your prescriber or the patient information leaflet that came with your pen will give you guidance specific to your situation. For a closer look at the effects people commonly notice on tirzepatide, including changes beyond the scale, that page covers the topic in more detail.
You can find a broader overview of everything related to this medicine on our Mounjaro guide.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Tracking your Mounjaro journey with GLP Trackr
Staying on top of a once-weekly injection schedule — with rotating sites, changing dose strengths over time, and a body that is responding in new ways — is easier when everything is in one place. GLP Trackr is built specifically for people already on Mounjaro and Wegovy, and the injection-site tracking and rotation feature is one of the most practical tools it offers: log each injection and the app keeps a history of your sites, suggesting where to go next so rotation becomes automatic rather than something to remember.
Alongside site tracking, the dose logging feature means every injection — date, time, and strength — is recorded in a clear timeline. That record becomes genuinely useful at prescriber appointments, giving you and your doctor an accurate picture of your schedule rather than a rough memory. If you ever want to explore how tirzepatide fits into a longer weight-management journey, or review what to expect week by week on tirzepatide, those pages are worth reading alongside this one.
The app also lets you log side effects and how you feel each day — useful for spotting patterns (nausea after a dose increase, energy changes, sleep shifts) and for having an informed conversation with your prescriber rather than relying on memory alone.
GLP Trackr is a tracking and journaling tool. It is not a substitute for your prescriber's advice, and any questions about your dose, your side effects, or whether Mounjaro is right for you should always go to your healthcare professional.
Ready to bring your whole journey into one clear view? Download GLP Trackr on the App Store or Google Play — it's free to get started with a 7-day trial.
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Start every day with a 60-second wellness check-in. Log how you're feeling, track nausea, appetite, energy, and mood — giving you and your care team a complete picture of how your medication is working.
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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.
Tirzepatide is the active ingredient; Mounjaro is the brand name of the medicine that contains it. They refer to the same treatment — a once-weekly injectable dual GIP and GLP-1 receptor agonist prescribed for weight management.
Tirzepatide acts on both GLP-1 and GIP receptors, making it a dual receptor agonist. This distinguishes it from medicines that act on GLP-1 alone, though it shares some similarities with that class.
Mounjaro is injected under the skin — typically in the abdomen, thigh, or upper arm — once a week. Rotating the injection site each week is generally recommended. Your prescriber or the patient information leaflet will advise on the specific technique for your situation.
Yes. GLP Trackr lets you log each injection including dose strength, date, site, and rotation history. The app suggests your next injection site automatically, and your full injection log is available to review or share at prescriber appointments.
Your prescriber or doctor decides your dose and any adjustments to it. Tirzepatide is typically started at a low strength and changed over time based on your individual response. Dose decisions should never be made without clinical guidance.