If you have tried diet after diet and the weight has come back every time, you are not failing at willpower. For many people, appetite and weight are driven by hormones that ordinary dieting cannot reach. Mounjaro works on those hormones, and for the right person, under the right clinical care, it can change what years of dieting could not.
This guide explains what Mounjaro is, how it works, how much weight people lose in the clinical trials, what the side effects are, who it suits, and exactly how to start with us at Superior Pharmacy. We are a GPhC-registered pharmacy and a CQC-registered prescribing service, and every treatment we issue is reviewed by one of our UK independent prescribers. Nothing here is a substitute for your own assessment, but by the end you will understand the medicine well enough to decide whether it is worth exploring.
What is Mounjaro?
Mounjaro is the brand name for tirzepatide, a prescription-only medicine given as a once-weekly injection under the skin. It was first licensed to help manage type 2 diabetes, and it is now also used for weight management in adults who meet the clinical criteria. The same active ingredient is sold as Zepbound in some countries, but in the UK the weight-management product you will hear about is Mounjaro.
It comes in a pre-filled pen that you use yourself once a week, on the same day each week. You do not need to visit a clinic to take it. After your assessment and prescriber approval, the pens are delivered to your door, and we guide you through using them.
How does Mounjaro work?
Tirzepatide is what scientists call a dual agonist. It activates two of the body’s appetite hormones at once: GIP and GLP-1. Most earlier weight-loss injections, including Wegovy, act on GLP-1 alone. Mounjaro adds the GIP receptor as well, and that second target is part of why it tends to produce larger weight loss in trials.
In practical terms, these hormones do three useful things. They slow how quickly your stomach empties, so you feel full for longer after eating. They reduce appetite signals in the brain, so you think about food less and feel satisfied with smaller portions. And they help your body manage blood sugar more steadily, which softens the cravings and energy crashes that derail so many diets.
Mounjaro is a tool, not a magic switch. It quietens the hunger that sabotages dieting, which makes healthy eating far easier to sustain. The eating and movement habits you build alongside it are what keep the weight off long term.
How much weight do people lose on Mounjaro?
The headline figures come from the SURMOUNT-1 trial, a large study of adults with obesity who did not have diabetes. On the highest 15mg dose, participants lost an average of around 22.5% of their body weight over 72 weeks, alongside diet and activity changes. For someone weighing 100kg, that is an average of more than 22kg.
It is worth being clear about what an average means. Some people lose more, some less, and your own result depends on your starting weight, the dose you reach, how your body responds, and the lifestyle changes you make at the same time. Most of our patients notice changes within the first four to eight weeks, with the larger results building over many months. We would rather set a realistic expectation than an inflated one.
The dose schedule, step by step
Mounjaro is always started low and increased slowly. This is deliberate: a gradual build-up gives your body time to adjust and keeps side effects to a minimum. Everyone begins on 2.5mg, which is a starter dose rather than a full treatment dose, and the prescriber reviews you before each step up. Doses are usually increased no sooner than every four weeks.
The six available strengths, and our monthly prices, are below. Your prescriber decides which dose you start and stay on, based on your assessment and how you respond, so please do not treat any single dose as a guaranteed starting point.
Every price includes your prescriber review, genuine UK-licensed medication, and fast discreet delivery. Your assessment and prescriber review are included, and there is no long-term contract, so you can pause or stop with us at any time. For a closer look at how the monthly cost changes as your dose changes, see our full Mounjaro cost breakdown for the UK.
One question we are asked constantly is what happens if you miss a dose or decide to stop. Because tirzepatide stays active in the body for a while after your last injection, the effect tails off gradually rather than vanishing overnight. We explain the timings in full in our guide to how long Mounjaro stays in your system, which is useful reading if you are planning surgery, a pregnancy, or a switch between providers.
Side effects, and how we help you manage them
Like any effective medicine, Mounjaro has side effects. The most common ones are digestive: nausea, constipation, diarrhoea, indigestion, a reduced appetite, and sometimes vomiting or stomach discomfort. They are usually mildest at the low starting dose and tend to ease as your body adjusts over the first few weeks. The slow dose build-up exists largely to keep these manageable.
There are simple, practical ways to reduce them: eating smaller portions, stopping when you feel full rather than finishing the plate, going easy on rich or greasy food, and keeping your fluids up. More serious reactions are uncommon, but Mounjaro is not suitable for everyone, which is exactly why a proper assessment comes first. Conditions such as a history of pancreatitis, certain thyroid concerns, pregnancy and breastfeeding all need careful review before treatment. Our dedicated guide to managing Mounjaro side effects goes through each one and when to seek advice.
You are not left to work this out alone. Our prescribers and pharmacists are available by email and review your progress at each refill, so if side effects are bothering you, we adjust the plan rather than leaving you to push through.
Your first few months on Mounjaro
Knowing roughly what to expect makes the early weeks far less daunting. In month one, you are on the 2.5mg starter dose, and the main goal is simply letting your body get used to the medicine. You may already notice you feel full sooner and think about food less, though weight changes at this stage are usually modest. Any side effects tend to show up now and settle as the weeks pass.
Through months two and three, your prescriber reviews how you are doing and, if appropriate, steps your dose up. This is typically when the scales start to move more clearly and clothes begin to feel looser. The pattern is gradual rather than dramatic, which is exactly what makes the loss easier to sustain. The trial results that reach into the high teens and low twenties as a percentage of body weight were measured over many months, not weeks, so patience pays off.
Beyond the first quarter, treatment becomes a steady routine: a once-weekly injection, a monthly review, and the eating and movement habits you are building alongside it. We check in at every refill so the plan keeps pace with your progress, and we adjust the dose if your response or your tolerance changes.
The people who keep the weight off treat Mounjaro as support for new habits, not a replacement for them. Using these months to build a way of eating and moving you can maintain is what protects your results if you ever come off the medicine.
Is Mounjaro right for you?
Mounjaro is intended for adults living with obesity, or with excess weight alongside a weight-related health condition. As a rough guide, eligibility is usually based on your body mass index, often from a BMI of 30 and above, or from around 27 where another condition such as high blood pressure or type 2 diabetes is present. These thresholds are a starting point, not a promise, and your prescriber makes the final decision after reviewing your full health picture. Our complete guide to Mounjaro eligibility in the UK sets out exactly what prescribers look at.
Availability on the NHS is currently limited and routed through specialist weight-management services, which often carry long waiting lists. A private route with a regulated pharmacy like ours gives you faster access, but it should never feel like a hard sell. If our prescribers decide Mounjaro is not safe or suitable for you, we will tell you, and you will not be charged for medication you cannot have.
Mounjaro compared with other weight-loss medicines
The treatment most people weigh against Mounjaro is Wegovy, which contains semaglutide. Both are once-weekly injections, both quieten appetite, and both are backed by strong trial evidence. The main difference is mechanism and scale of results: Mounjaro acts on two hormone pathways and tends to produce larger average weight loss, while Wegovy acts on one and may suit some people better on cost or tolerability. We prescribe both, so our advice is led by what fits you rather than by what we would prefer to sell. If you are choosing between them, our comparison of Mounjaro versus Wegovy lays out the evidence side by side, and you can read the full detail on each treatment on our Mounjaro and Wegovy pages. If you are already on Mounjaro with another provider and want to move, our step-by-step guide to switching Mounjaro providers in the UK explains how to do it without interrupting your treatment.
Neither is simply “better”: the right choice is the one your prescriber agrees suits your health and goals at your assessment.
You may also have seen headlines about a newer medicine, retatrutide, sometimes shortened to “Retta”. It is an investigational triple-hormone injection that has produced striking results in trials, but it is not yet licensed or available in the UK, and we cannot prescribe it. If you are curious about where the science is heading, for now, Mounjaro and Wegovy remain the licensed and available options in the UK.
Storage, delivery and what to expect at home
Mounjaro is a biological medicine and needs to be looked after correctly to keep working. Pens are kept refrigerated, and there is a limited window during which they can be at room temperature, which matters if you travel. We dispatch your medication in discreet, temperature-controlled packaging by a tracked service, typically aiming for next-day delivery once your prescription is approved. If you want the detail on fridge temperatures, travelling with your pen, and what to do if it has been left out, read our full guide to storing Mounjaro correctly.
Once you are an established patient, reordering is quick and your details are saved securely, so continuing your treatment each month takes only a couple of minutes.
How to start with Superior Pharmacy
Starting is simple and there is no commitment to begin. First, you complete our free online assessment, which asks about your weight, health history and any medicines you take. Next, one of our UK-registered independent prescribers reviews your answers, usually within 24 hours. If treatment is approved and suitable, your medication is dispensed by our regulated pharmacy and sent to your door. From there, you have ongoing support by email and a progress review at every refill.
What you get alongside the medicine matters as much as the prescription itself. You can contact your prescribing pharmacist directly rather than waiting weeks for an appointment, and you have access to the Prescribe Me app to track your progress, nutrition and habits, with weekly guidance from our team. That ongoing, named clinical support is the difference between a one-off purchase and a treatment plan that actually keeps you moving towards your goal.
You do not need a referral, and you do not need to mention any of this to anyone before you are ready. The first step costs nothing and commits you to nothing, so it is a low-risk way to find out whether Mounjaro is an option for you.
Frequently asked questions
How quickly will I see results on Mounjaro?
Most people notice reduced appetite within the first week or two, and visible weight changes within four to eight weeks. The larger results in the trials built up over many months, so it is best viewed as a long-term treatment rather than a quick fix.
Do I have to inject myself?
Yes, but the pen is designed to make this easy. It is a once-weekly injection under the skin of the stomach, thigh or upper arm, and most people find it far simpler than they expected. We provide clear guidance on how to use it.
What happens if I stop taking Mounjaro?
Appetite gradually returns as the medicine clears from your body, and some weight regain is possible if the habits you built are not maintained. This is why we focus on lasting eating and activity changes alongside the medication, so you are not relying on it indefinitely.
Is Mounjaro the same as Ozempic or Wegovy?
No. Ozempic and Wegovy both contain semaglutide and act on one hormone pathway. Mounjaro contains tirzepatide and acts on two, which is associated with larger average weight loss in trials. Your prescriber will help you choose what suits you.
Can I get Mounjaro if I do not have diabetes?
Yes. While tirzepatide was first used for type 2 diabetes, it is prescribed for weight management in adults who meet the clinical criteria, whether or not they have diabetes. Eligibility is decided at your assessment.
How much does Mounjaro cost at Superior Pharmacy?
Prices start at £149.99 per month for the 2.5mg starter dose and rise with the dose, up to £299.99 per month for 15mg. Every price includes your prescriber review, genuine medication and fast, discreet delivery.
How is my medication delivered?
Once your prescription is approved, we dispatch it in discreet, temperature-controlled packaging by a tracked service, usually aiming for next-day delivery. Your pens arrive ready to store in the fridge.
What if Mounjaro is not suitable for me?
If our prescribers decide it is not safe or right for you, they will tell you and you will not be charged for medication. There is no commitment to starting, and you can pause or stop at any time once you have.
This guide is general information and not a substitute for personal medical advice. Mounjaro is a prescription-only medicine and is only supplied after an online assessment and approval by one of our UK-registered independent prescribers. Always read the patient information leaflet, and speak to your prescriber or pharmacist about your individual circumstances.