Mounjaro: The Prescription Injection Starting With M
Mounjaro (tirzepatide) is a prescription-only, once-weekly injectable medicine. It acts on two appetite-regulating pathways in the body — GLP-1 and GIP receptors — which is why it is described as a dual agonist. Many people prescribed it report increased feelings of fullness and reduced appetite, though individual experiences vary.
How it is taken
Mounjaro is supplied as a pre-filled pen and is injected subcutaneously — just under the skin. The three most commonly used sites are the abdomen, the front of the thigh, and the outer upper arm. Rotating between these sites with each injection is generally recommended to allow each area time to recover and to reduce the likelihood of localised skin reactions.
Dose titration
Treatment typically begins at a lower dose and is adjusted over time by your prescriber. The dose strengths commonly associated with Mounjaro are 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, and 15 mg. Any decision about your dose — including when or whether to move up — belongs with your prescriber or doctor, not with you alone.
Reporting side effects
Mounjaro carries a black triangle (▼) designation, meaning it is subject to additional monitoring. If you experience side effects, report them to your healthcare professional and, where applicable, to your national reporting scheme (such as the UK's Yellow Card scheme).
For a broader overview of injectable weight loss medicines and how they compare, see our guide to weight loss injections. If you are curious about another injectable — tirzepatide under a different angle — take a look at our page on the weight loss injection starting with T.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
Tracking the right four numbers — weight, waist, protein and dose — turns a noisy chart into a clear story. That's the loop GLP-1 users keep coming back for.
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Tracking Your Mounjaro Injections With GLP Trackr
Staying on top of a weekly injection schedule — including which site you used last and what dose you are on — is easier with a dedicated log. GLP Trackr's injection-site tracking feature records each site you use (abdomen, thigh, or arm) and automatically suggests your next rotation, so you never have to remember it yourself.
Alongside site rotation, the app logs each dose's date, time, and strength, giving you a clear history to refer back to. Dose reminders help make sure a weekly injection does not slip your mind during a busy week.
If you notice anything after an injection — a skin reaction, unusual discomfort, or another symptom — GLP Trackr's side-effect tracker lets you log it with a timestamp. That kind of record is genuinely useful to bring to your next prescriber appointment, so your healthcare professional has a clear picture rather than a vague recollection.
A note on safety: GLP Trackr helps you organise and record your journey — it is not a substitute for the guidance of your prescriber or doctor. If you experience anything severe, persistent, or worrying after an injection, contact your healthcare professional promptly. Questions about injection technique, dose adjustments, or whether a reaction is medically significant should always go to them first.
You may also find it helpful to browse our pages on understanding injection costs and making the most of your treatment as part of planning your journey.
Ready to take the guesswork out of injection-site rotation? GLP Trackr logs every shot, tracks your sites, and nudges you when your next dose is due. Download it free on the App Store or Google Play — your first 7 days are on us.
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Morning Check-In
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.
Injection Tracking
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.
Hydration Reminders
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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Browse 50+ high-protein, GLP-1-friendly recipes filtered by meal type, prep time, and dietary needs. Every recipe includes full nutrition info, step-by-step instructions, and tips for eating with side effects.
Progress Analytics
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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Snap a photo of any meal and get a full nutrition breakdown in seconds — calories, protein, carbs, fat, and fibre. No searching. No manual logging. Just point, snap, and track.
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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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GLPIQ learns your personal side effect patterns over time. After a few cycles, it starts warning you the morning before a rough day — and adjusts your meal plan automatically.
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Frequently asked questions.
The main prescription weight loss injection starting with M is Mounjaro, the brand name for tirzepatide. It is a once-weekly injectable medicine that acts on both GLP-1 and GIP receptors. It is prescription-only and only suitable for people whose prescriber has determined it is appropriate for them.
Mounjaro is injected subcutaneously — just under the skin — into the abdomen, front of the thigh, or outer upper arm. Rotating the site with each injection is generally recommended. Your prescriber or the leaflet that came with your pen is the best guide to technique.
Yes, rotating injection sites is generally recommended to allow skin and tissue to recover between injections. Common sites are the abdomen, thigh, and upper arm. GLP Trackr can log each site you use and suggest your next rotation automatically.
GLP Trackr lets you log each injection — date, time, dose strength, and site — and tracks your rotation history so it can suggest your next site. It also sends dose reminders and lets you record any post-injection symptoms to discuss with your prescriber.
Mounjaro (tirzepatide) is currently the most widely prescribed weight loss injection whose brand name starts with M. If you are unsure which medicine has been prescribed to you, check your prescription or speak with your prescriber or pharmacist.