Is Mounjaro Used for Diabetes? What the UK Licence Says (October 2026)

01 · The short answer

Is Mounjaro used for diabetes?

Yes. Mounjaro is licensed in the UK for type 2 diabetes, and it is also licensed for weight management.

The drug is the same in both cases. What differs is the reason it is prescribed, the clinician who monitors it, and the targets you are working towards.

For diabetes, the goal is better blood sugar control. Mounjaro is also licensed for type 2 diabetes, where it improves blood sugar control (HbA1c) and supports weight loss.¹ Weight management is a separate licensed purpose, with its own eligibility rules.

The same drug is also covered in our wider guide on the conditions Mounjaro is used to treat.

02 · Which licence applies to you

Diabetes licence or weight-management licence: which applies to you?

It depends on why you are being treated. If you have been diagnosed with type 2 diabetes and your clinician wants better blood sugar control, the diabetes licence applies. If your aim is to manage weight, the weight-management licence applies. Some people are in both groups, which is why joined-up care matters.

Because the medicine is identical, any change you make affects both goals. Tell every clinician involved. If you have type 2 diabetes, treatment and monitoring are coordinated differently, so tell your prescriber and your usual diabetes team so care stays joined up.¹

03 · Your next step

What to do next

If you already have diabetes, start with your GP or diabetes team. They hold your blood sugar results, your current medicines and your history, and they decide whether Mounjaro belongs in your plan. Do not start, stop or change a diabetes medicine on your own.

If your goal is weight management and you do not have diabetes, or you have discussed it with your clinician, you can start with our free consultation on the Mounjaro pen page. A GPhC-registered prescriber reviews every request. The standard price of the 2.5mg starting pen is £169.99 per month, and your first 2.5mg pen costs £129.99 with code FIRST40. Every later order is £25 off the standard price. Prices checked 10 October 2026.

Our online service is built around weight management. For wider context, see our weight loss clinic overview and our guide on whether Mounjaro is used for weight loss.

04 · How it works

How Mounjaro works in the body

Mounjaro works by acting on two hormone signals that the gut normally releases after eating. Tirzepatide is the first treatment of its kind to activate two natural gut-hormone receptors at once: GIP and GLP-1.¹

Together these help regulate appetite, slow how quickly the stomach empties, and improve the way the body responds to insulin.¹ Each of those effects matters for someone with diabetes. Better response to insulin supports blood sugar control.

The dual action is what sets it apart. This dual action is what distinguishes Mounjaro from single-action GLP-1 medicines such as semaglutide (Wegovy/Ozempic).¹

Mounjaro is a once-weekly injectable. It comes as a pre-filled multi-dose pen (KwikPen) in six strengths: 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg and 15mg.¹ Treatment normally begins at the lowest strength and moves up in steps, with your prescriber setting the pace. For a wider view of the drug class, read our explainer on gut-hormone medicines used for diabetes.

05 · What it does

What Mounjaro does for people with diabetes

For people with type 2 diabetes, Mounjaro improves blood sugar control and supports weight loss. That is the core of its diabetes licence.¹

Weight loss is a supported benefit rather than the main purpose in the diabetes setting. Many people with diabetes also want to lose weight, and a medicine that helps with both can simplify a treatment plan. Even so, the order of priorities is set by your clinician, not by the pen.

Mounjaro does not replace the basics. It is used alongside a reduced-calorie diet and increased physical activity.¹ It is not a cure, and you should keep your regular diabetes checks and other prescribed medicines unless your clinician tells you otherwise.

Our companion page on what tirzepatide is used for covers the active ingredient in more general terms, and what else tirzepatide is used for looks beyond diabetes.

06 · Versus Ozempic

Mounjaro or Ozempic for diabetes: how do they compare?

Neither is better for everyone. Both are once-weekly injections, and the right choice depends on your health, your other medicines and your tolerance. Your prescriber decides, not a headline comparison. 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.

The difference in how they work is real. Mounjaro acts on two gut-hormone pathways, whereas semaglutide acts on one. This dual action is what distinguishes Mounjaro from single-action GLP-1 medicines such as semaglutide (Wegovy/Ozempic).¹

Practical factors usually decide the matter:

• What your diabetes team has available and recommends under local NHS guidance.
• How you tolerated any earlier injectable treatment.
• Your other medicines, especially insulin or tablets that lower blood sugar.
• Your weight goals alongside blood sugar control.
• Whether supply and access are reliable where you live.

If you are weighing the two, bring the question to your diabetes team and ask directly why they favour one. A good clinician will explain the reasoning and the monitoring plan.

07 · Alongside other medicines

Taking Mounjaro with other diabetes treatments

Tell your prescriber about every medicine you take, including insulin and tablets that lower blood sugar. If you take insulin or sulfonylureas, doses may need reducing to avoid low blood sugar. They are not forbidden with Mounjaro; they simply need review.¹

This is the main reason a diabetes team should be involved. They can plan any change, tell you which symptoms of low blood sugar to watch for and set up the right checks. Changing doses without that guidance is unsafe.

Read the patient information leaflet supplied with every pen.¹³ Keep it, because the details can matter weeks after your first dose.

Keep the pen in the fridge until first use, in line with the leaflet. Once in use, a KwikPen 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. Do not use a pen that has been above 30°C or frozen. Follow the pen's own instructions for each injection.¹³

08 · Who qualifies

Who qualifies for Mounjaro, and who does not?

Eligibility depends on which licence is relevant. For type 2 diabetes, your GP or diabetes team judges whether Mounjaro fits your treatment plan under NICE guidance for tirzepatide in type 2 diabetes.⁸ For weight management, the criteria differ.

The NHS picture for weight management is phased. 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).⁴⁶ Full rollout is expected to take years, which is why many people who meet the licensed criteria choose regulated private treatment rather than waiting.

What disqualifies someone is a clinical judgement. A prescriber looks at your medical history, current medicines and any conditions that make the treatment unsuitable. 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. 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.

Payment is taken when you place the order; if the prescriber decides the treatment is not suitable, the order is refunded automatically in full.

09 · Weight and results

How much weight can you lose, and how fast?

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.²

Those averages were reached over a long period and at specific strengths, with dose increases made step by step. Use them to understand the scale of what is possible, not to predict a number for yourself.

If you have diabetes, your weight change may differ from those trial averages, and your clinician will be watching blood sugar as well as weight. For a deeper look at the weight-management side, see what the medicine Mounjaro is used for in our other guide.

10 · Side effects

Common side effects and what to do

The most common side effects, affecting more than 1 in 10 people, are nausea, diarrhoea, vomiting, constipation and abdominal discomfort.¹³ They tend to appear when treatment starts or when the strength goes up, and many people find they settle with time.

Smaller meals, slower eating and fewer rich or fatty foods are sensible habits, and your prescriber can give tailored advice.

If nausea or vomiting is persistent or you cannot keep fluids down, contact your clinical team, as dehydration needs medical help straight away.

You can report any suspected side effect through the MHRA Yellow Card scheme.¹⁹ Reports help regulators monitor medicines after launch, and you do not need to be sure the medicine caused the problem.

11 · Buying safely

Getting Mounjaro safely

Mounjaro (tirzepatide) is a prescription-only medicine, supplied only after an online consultation reviewed by a GPhC-registered prescriber.¹ Anyone offering to supply it without a consultation or prescription is not operating safely, and the MHRA publishes counterfeit medicine alerts.⁷

Check that a pharmacy appears on the GPhC register. Ours is registered under GPhC 9012878, and you can check our GPhC registration yourself.¹²

We supply genuine KwikPens through official LillyDirect supply, direct from Eli Lilly's UK distribution. Delivery is free, next-day and tracked, in discreet temperature-controlled packaging, and same-day dispatch applies when you order by 3pm. All six doses are in stock. Aftercare includes ongoing monthly reviews, and repeat orders re-check suitability with no auto-shipping.

Individual results vary. This page is information, not a substitute for medical advice.

12 · Serious side effects

Serious side effects: when to get help straight away

Serious side effects are uncommon but need urgent attention. 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. If you take insulin or a sulfonylurea alongside Mounjaro, watch for low blood sugar (shakiness, sweating, confusion) — your prescriber may need to adjust those medicines.¹