What is the minimum BMI for Mounjaro, and what else affects eligibility?

What BMI do you need for Mounjaro to be licensed?

Mounjaro's UK licence covers two routes in. The first is a BMI of 30 kg/m² or above with no further condition required. The second is a BMI of 27 to 29.9 kg/m² provided you have at least one weight-related health condition. The list of qualifying conditions is broad: type 2 diabetes, prediabetes, high blood pressure, dyslipidaemia (raised cholesterol or triglycerides), obstructive sleep apnoea, and cardiovascular disease are all examples that appear in guidance from NHS England's obesity medicines resource.

A common misconception worth letting go of gently: many people assume a BMI of 30 is some sort of hard floor below which nothing is possible. In practice, the 27-plus route means a meaningful number of people in the healthy-overweight range are within the licensed eligibility window, as long as their clinical history supports it. If you are unsure where your BMI sits right now, the NHS BMI calculator gives you a quick, reliable figure.

One more detail that often gets overlooked: ethnic background can shift these thresholds by 2.5 kg/m² downward under UK clinical guidance, meaning some groups qualify at a BMI of 27.5 instead of 30, or at 24.5 instead of 27. The fuller breakdown of BMI and Mounjaro eligibility covers this in more depth.

Does meeting the BMI threshold mean you will definitely get a prescription?

Not automatically. The BMI thresholds define where the licensed use of Mounjaro begins, they do not replace clinical assessment. A prescriber will also look at your current medicines, your medical history, and whether any contraindications apply. People with a personal or family history of medullary thyroid carcinoma, multiple endocrine neoplasia type 2, or a history of pancreatitis will need to discuss this carefully with a clinician. Pregnancy, breastfeeding, and trying to conceive are situations where Mounjaro is not recommended.

This is why the consultation exists. At nume, every application is read by a named, GPhC-registered Independent Prescriber on the day it arrives, a real clinician considers the whole picture, not a checklist run by software. If you are transferring from another provider or requesting a dose above the starter level, you will be asked to provide supporting evidence, because that is the clinically appropriate thing to do. The process takes the BMI number as its starting point, then works from there.

If you want to understand how your specific BMI of 27 affects eligibility, the page on Mounjaro at a BMI of 27 goes into the detail for that threshold specifically.

How does the NHS set its Mounjaro BMI criteria, and how does private access differ?

NICE recommended tirzepatide (Mounjaro) for NHS use in December 2024, under technology appraisal TA1026. The NHS criteria are considerably narrower than the licensed indication: currently, NHS access requires a BMI of at least 35 alongside four or more of a defined list of weight-related conditions. A second cohort covering BMI 35–39.9 with four or more conditions opened in June 2026, with further phases planned into 2027.

Private prescribing works to the licensed thresholds (BMI 30 or 27-plus with a qualifying condition) rather than the stricter NHS commissioning criteria. That gap is significant. Someone with a BMI of 28 and well-controlled hypertension sits within the private licensed window but well outside current NHS eligibility. Private treatment through a regulated pharmacy like nume means no referral, no waiting list, and no dependence on whether your GP practice has joined the new prescribing scheme. It does mean paying for the service privately; you can find current treatment pricing on our treatment and consultation page.

For context on how a BMI of 28 specifically interacts with eligibility, the Mounjaro at BMI 28 page addresses that scenario directly.

What should you do if you are close to the minimum BMI threshold?

If your BMI is near 27 and you have a health condition that might qualify, the most useful step is a proper clinical consultation rather than trying to self-assess from a list. Conditions like prediabetes or mild hypertension are not always ones people know they have; a prescriber reviewing your Summary Care Record or the health information you provide may identify a qualifying condition you were not aware of.

Equally, if your BMI sits at 26 or 25, the honest answer is that Mounjaro is not licensed at those figures and a responsible prescriber will not issue a prescription at that level. The Mounjaro BMI 25 page explains the position clearly, and the BMI 26 page covers the adjacent scenario. There are other licensed options for weight management, our weight-loss treatment overview covers what is available and at which thresholds. If Mounjaro is clinically appropriate for you, a free consultation with our prescribers is the right next step. Worth checking before assuming either way.