About Mounjaro (Tirzepatide): A Plain UK Guide (October 2026)

01 · The basics

What is Mounjaro?

Mounjaro is the brand name for tirzepatide, a once-weekly injectable prescription medicine made by Eli Lilly. In the UK it is licensed for weight management in adults and for type 2 diabetes.¹ It comes as a pre-filled multi-dose pen (KwikPen) in six strengths: 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg and 15mg.¹

Some people have just heard the name on the news. Some have a friend who is using it. Others are weighing it against other weight loss injections. Whatever brought you here, the short version is that it is a serious prescription medicine with a licence, a patient information leaflet and a prescriber behind every supply. It is not a supplement, a quick fix or a lifestyle product.

Tirzepatide is the generic name for the active ingredient. If you see "tirzepatide" on an NHS page or a clinical guideline, it is the same medicine as Mounjaro. The brand name simply tells you which manufacturer's pen you are holding.

If you want a broader overview before going deeper, our guide to weight loss injections in general sets Mounjaro in context with the other options.

02 · Your decision

Is Mounjaro relevant to you?

Mounjaro may be relevant if you are an adult looking for medical help with weight management and you are willing to change how you eat and move at the same time. The medicine is used alongside a reduced-calorie diet and increased physical activity.¹ Individual results vary, and it is not suitable for everyone.

Whether it suits you depends on your health history, your current medicines and your goals. That is a decision for a prescriber, not for a web page. Mounjaro is a prescription-only medicine, supplied only after an online consultation reviewed by a GPhC-registered prescriber. This page is information, not a substitute for medical advice.

If you already know you want to take things further, you can start a free consultation through our weight loss clinic. The Mounjaro pen costs £169.99 at the 2.5mg starting dose, and your first 2.5mg pen costs £129.99 with code FIRST40. Every later order is £25 off the standard price (code DOSE25). Prices checked 10 October 2026.

03 · How it works

How Mounjaro works

Tirzepatide is the first treatment of its kind to activate two natural gut-hormone receptors at once: GIP and GLP-1. Together these help regulate appetite, slow how quickly the stomach empties, and improve the way the body responds to insulin.¹

In practice, most people feel fuller sooner and less hungry between meals, which supports a reduced-calorie diet. That is the core of how it helps with weight management. It does not remove the need to eat sensibly. It makes a reduced-calorie diet easier to follow for many people.

This dual action is what distinguishes Mounjaro from single-action GLP-1 medicines such as semaglutide (Wegovy/Ozempic). Ozempic is semaglutide licensed for type 2 diabetes — it is not a UK weight-loss medicine, and prescribing it privately for weight loss is off-label. Wegovy is also semaglutide, licensed for weight management. Mounjaro contains tirzepatide, so the three are not interchangeable and a prescriber would not treat them as the same thing.

The medicine is given as an injection under the skin once a week, using a pre-filled pen. Needles, a sharps bin and injection guidance come with every order from us, and the patient information leaflet in the box explains the pen step by step. Follow the pen's instructions rather than relying on videos or social posts.

Each pen is a multi-dose KwikPen. Once in use, a pen can be kept out of the fridge at a temperature not above 30°C for up to 30 days after first use, and must then be thrown away. Before first use, store pens at 2–8°C in the fridge and keep them until the printed expiry date. For anything unusual about storage, check the leaflet or ask the pharmacy.

04 · What trials showed

What the trials showed

The headline weight-loss evidence for Mounjaro comes from the SURMOUNT-1 trial. In the SURMOUNT-1 trial of 2,539 adults, people taking tirzepatide alongside diet and exercise lost on average 15% of their body weight on 5mg, 19.5% on 10mg and 20.9% on 15mg over 72 weeks, compared with 3.1% with lifestyle changes alone.²

These are trial averages — individual results vary, and treatment works alongside a reduced-calorie diet and increased physical activity, not instead of them. At 72 weeks, 85% of participants on 5mg, 89% on 10mg and 91% on 15mg had lost at least 5% of their body weight. Half of participants on 10mg and 57% on 15mg lost at least 20% of their body weight.²

Read those numbers carefully. An average is a midpoint, not a forecast for you. Some people lose less than the average, some lose more, and the trial tells you nothing about which group you will fall into. Trial averages do not predict your own result. The comparison with lifestyle changes alone is also useful: the trial's comparison group made diet and activity changes too, which is why the medicine is described as working alongside them.

If you are weighing Mounjaro against semaglutide, note that a direct head-to-head comparison exists in the SURMOUNT-5 trial, which is published in the New England Journal of Medicine.¹⁵ Results from different trials with different participants should not be lined up side by side as though they were a like-for-like contest.

Our piece on the truth about Mounjaro goes through the claims you are likely to meet online and what the evidence does and does not support.

05 · NHS or private

NHS or private access

Mounjaro is available on the NHS, but access is being phased in over several years.⁶ NICE recommends it for adults with a BMI of at least 35 plus at least one weight-related condition, and the NHS primary-care rollout began in June 2025 with the highest-need groups first (initially BMI 40+ with four or more qualifying conditions).⁴

Full rollout is expected to take years, which is why many people who meet the licensed criteria choose regulated private treatment rather than waiting. If you are unsure where you stand, your GP is the right person to ask about NHS routes. The NHS's own tirzepatide page is also a reliable plain-English reference.⁵

Private treatment is not a shortcut around clinical judgement. A regulated online pharmacy should still ask about your health, review your answers with a prescriber and decline orders that are not suitable. At EverydayMeds the consultation is free, and every order is reviewed by a GPhC-registered prescriber. Payment is taken when you place the order; if the prescriber decides the treatment is not suitable, the order is refunded automatically in full. We are a GPhC-registered pharmacy, registration 9012878, which you can check on the GPhC register.¹²

For service details, our Mounjaro supply comes through official LillyDirect channels, directly from Eli Lilly's UK distribution, and all six doses are in stock. Delivery is free, next-day and tracked, in temperature-controlled packaging, with same-day dispatch when ordered by 3pm.

06 · Safety and exclusions

Safety and who should not take Mounjaro

Mounjaro is not suitable for everyone. You should not take it if you are allergic to tirzepatide or any of its ingredients, and it should not be used during pregnancy or while trying to conceive. Mounjaro must not be used during pregnancy, and it should be stopped at least one month before trying to conceive. If you become pregnant during treatment, stop the medicine and tell your prescriber promptly. Your prescriber will take extra care, or may recommend against treatment, if you have a history of pancreatitis, severe gut or digestive disease, diabetic retinopathy, or gallbladder problems.¹³

Be open in your consultation about your medical history, anything you take regularly and whether you are pregnant, breastfeeding or planning a pregnancy. Mention any past problems with your pancreas, gallbladder or digestive system. This is why a prescriber looks at each order.

Some medicines need special attention. If you use insulin or a sulfonylurea, doses may need adjusting because of the risk of low blood sugar. Tell your prescriber so they can plan this with you. Mounjaro slows stomach emptying, which can reduce how well oral contraceptive pills are absorbed.⁷ The SmPC advises switching to a non-oral method, or adding a barrier method (such as condoms), for 4 weeks after starting Mounjaro and for 4 weeks after each dose increase.¹

Like all medicines, Mounjaro can cause side effects, and most are digestive. The most common — affecting more than 1 in 10 people — are nausea, diarrhoea, vomiting, constipation and abdominal discomfort.¹ Our guide to Mounjaro side effects to worry about explains which symptoms deserve a call to your prescriber, and which are the sort of thing you mention at your next review.

If you notice anything new or worrying, talk to your prescriber or GP. You can also report suspected side effects through the MHRA Yellow Card scheme, which helps regulators monitor medicines.¹⁹ Seek immediate medical help for: severe, persistent stomach pain that may spread to your back, with or without vomiting (possible pancreatitis); pain in the upper right abdomen, fever or yellowing of skin/eyes (possible gallbladder problems); or signs of a severe allergic reaction such as swelling of the face or throat and difficulty breathing.

Pancreatitis is a question people ask often. There is no proven way to prevent pancreatitis or gallbladder problems while taking Mounjaro. Before you start, tell your prescriber if you have ever had pancreatitis, gallstones or gallbladder disease, or severe problems with your digestion. Severe, persistent stomach pain that may spread to the back, with or without being sick, could be pancreatitis — stop using Mounjaro and get medical help straight away. Pain in the upper right of the abdomen, fever or yellowing of the skin or eyes could be a gallbladder problem — get medical help straight away.

07 · Day to day

Eating and day-to-day life on Mounjaro

Mounjaro is used alongside a reduced-calorie diet and increased physical activity, so what you eat still matters.¹ People often ask for a "what I eat in a day" plan. Many people find smaller meals eaten slowly easier.

That is a reason to think about regular, sensible meals rather than skipping them, and to ask your prescriber if you struggle to eat enough. No food is banned on Mounjaro. Prioritise protein at each meal, vegetables and fibre, and regular fluids; many people feel worse after very fatty, fried or very sugary food.

Mounjaro is a weekly injection, so many people find it easiest to choose a regular day and stick to it. Keep your pens stored as the leaflet instructs. Ongoing monthly clinical reviews with our prescribing team are included, covering dose changes, follow-up assessments and side-effect support. Repeat orders re-check suitability, and nothing ships automatically.

A free companion app, GLPTrackr, is available on iOS and Android if you want to log your injections and track your progress in one place.

Everyone starts on 2.5mg once a week, and the dose can step up after at least 4 weeks on each dose, depending on how you respond. Your prescriber decides whether and when to move up a strength. If you step up after 4 weeks on each dose, your first four pens (2.5mg to 10mg) cost £959.96 at standard prices, and a new customer's first order is £40 less, with every later order £25 less. A first year costs £2,711.88 if you stay on 5mg after your 2.5mg starting pen, up to £3,599.88 if you step up through every dose to 15mg, at standard prices before those discounts.

08 · Stopping Mounjaro

Stopping Mounjaro and long-term use

Stopping Mounjaro is a decision to make with your prescriber, not on your own, and it is worth having a plan before you start. Tirzepatide has a half-life of about five days, so after a final dose it takes roughly 4–5 weeks to clear the system — there is no way to speed this up, and nothing needs doing while it clears.¹

People often ask how to come off Mounjaro without regaining weight. In SURMOUNT-4, people who stopped tirzepatide after 36 weeks regained on average 14% of body weight over the following year, while those who continued treatment lost a further 5.5% on average. The habits you build while using it are what you carry forward. Ask your prescriber about stepping down, maintenance and what to do if your appetite returns.

There is also research on continuing treatment to maintain weight reduction, published as the SURMOUNT-4 study in JAMA.¹⁴

For long-term use, ask your prescriber, and see the product information.¹ Regulators keep medicines under review, and the Yellow Card scheme is how suspected side effects reach them.¹⁹ Regular reviews are your safeguard: they give you a scheduled chance to raise anything that has changed.

09 · News and reviews

News, reviews and programmes about Mounjaro

Mounjaro gets a lot of media attention, and the quality of what you read varies hugely. News stories, TV and radio programmes, podcasts and personal reviews can each be useful, but none of them replaces the licensed product information.

A sensible way to read coverage is to ask three questions. First, is the claim about the medicine itself, or about one person's experience? Second, does it name a trial or a regulator, and can you find the original? Third, is the person selling something? A review that lists no downsides, or a story built around dramatic weight-loss claims, deserves caution. Personal accounts differ from person to person, and trial averages do not predict your own result.

Price news is a good example. Eli Lilly announced a UK list-price increase for Mounjaro, and pharmacy sell prices vary because of confidential discounts.¹⁰ Across the UK pharmacies we track, the cheapest and dearest Mounjaro pens are £143.96 and £339.00 per month across all doses, checked 10 October 2026. The gap between providers for the same dose ranges from £27 to £41. That is why comparing like-for-like doses matters.

Counterfeit and unregulated products are a real risk when demand is high. The MHRA publishes counterfeit medicine alerts and runs the Yellow Card scheme.⁷ Be wary of any seller offering to supply without a consultation or prescription. A legitimate pharmacy will review your health first, and you can verify its registration on the GPhC register.

For rolling coverage, our Mounjaro news roundup collects developments, our facts about weight loss injections page separates common myths from the evidence, and the Mounjaro podcast page is the place for audio listeners.

10 · Choosing a provider

Choosing where to get Mounjaro

If you decide to go private, choose a provider that is registered, that reviews your health properly and that supports you after the first box arrives. Check registration on the GPhC register, look for a named pharmacy rather than just a brand, and be sceptical of anything that skips the consultation.¹²

• Complete a free online consultation. It is a short health questionnaire, with no charge and no obligation.
• A GPhC-registered prescriber reviews it. Payment is taken when you place the order; if the prescriber decides the treatment is not suitable, the order is refunded automatically in full.
• Our registered pharmacy dispenses and dispatches your order, with free next-day tracked delivery in discreet, temperature-controlled packaging. Saturday delivery is £14.99.

The consultation is free, and the price shown is the price paid, with no hidden fees. You can pay by Visa, Mastercard or Klarna, and pay-monthly options exist. There are no subscriptions. Dispensed prescription medicines cannot be returned except when faulty, damaged or the wrong item.

Support is available by email at support@everydaymeds.co.uk, through the account portal chat and by phone on weekdays during office hours.

When you are ready, start with the Mounjaro pen prices and consultation page.