What BMI do you need to get Mounjaro in the UK?

You've checked your BMI and it's over 30, here's what that actually means for Mounjaro

A BMI of 30 or above puts you within the licensed eligibility range for Mounjaro, and that's a meaningful threshold. But reaching it doesn't trigger an automatic prescription. The UK licence (granted by the MHRA for adults with obesity) frames Mounjaro as a treatment to be used alongside a reduced-calorie diet and increased physical activity, and always under clinical supervision.

So when a prescriber looks at your consultation, they're asking more than "does the number qualify?" They're checking whether anything in your medical history makes Mounjaro unsuitable: a personal or family history of medullary thyroid carcinoma, a condition called MEN2, active pancreatitis, or certain gastrointestinal disorders. Existing medications matter too. Some interact with tirzepatide in ways that affect how other drugs are absorbed, which is especially relevant if you take oral contraceptives, guidance from NHS England advises adding a non-oral contraceptive method for the first four weeks of treatment and for four weeks after each dose increase, because the pill's absorption may be reduced during that window.

None of this is meant to put you off. It's just what responsible prescribing looks like. Most people who meet the BMI threshold and don't have a listed contraindication are clinically suitable. The full list of qualifying criteria covers all of this in detail if you want to read further before your consultation.

What if your BMI is between 27 and 29.9?

This is where a lot of people get tripped up, because 30 is often quoted as "the" threshold and the second route goes unmentioned. The licensed indication is clear: a BMI of 27 to 29.9 qualifies if you have at least one weight-related comorbidity. Conditions that count include type 2 diabetes, prediabetes, high blood pressure, high cholesterol, obstructive sleep apnoea, and osteoarthritis, among others.

That qualifying condition has to be documented and verifiable, a prescriber will ask about it, and at nume, consultations include checks designed to confirm this properly. It's not a loophole; it reflects the clinical reality that for people in this BMI range, weight management is already medically relevant and treatment can make a meaningful difference to those conditions as well as to weight itself.

It's also worth knowing that lower BMI thresholds apply for some ethnic backgrounds. Adults of South Asian, Chinese, Middle Eastern, Black African or African-Caribbean heritage are typically assessed at thresholds around 2.5 kg/m² lower, in line with evidence that metabolic risk rises at lower BMIs in these populations. So a qualifying BMI with a comorbidity could be as low as 27.5 for some people. If you want to understand exactly what BMI you need for Mounjaro, including how these adjusted thresholds work in practice, that page goes into the detail if your own background is relevant here.

Not sure of your exact BMI? The NHS BMI calculator gives you a reliable figure in under a minute.

NHS eligibility is different, and considerably stricter

The private prescribing criteria above come from Mounjaro's product licence. The NHS runs a separate and more restrictive access programme, governed by NICE technology appraisal TA1026, which rolls out in phases. As of summer 2026, NHS access requires a BMI of at least 40 alongside four or more specific weight-related conditions from a defined list, and the cohort with BMI 35–39.9 plus four or more conditions became eligible in June 2026. GP practices can now prescribe under the 2026/27 contract, but participation varies, and qualifying doesn't guarantee immediate access.

That gap between "meets the private licence criteria" and "qualifies for NHS tirzepatide right now" is wide, and it's the reason many people look at private routes. A BMI of 31 with hypertension meets the licence standard comfortably. It may be years before NHS pathways reach that cohort. Private prescribing through a regulated online pharmacy means no referral, no waiting list, but also no shortcuts on the clinical assessment. Every prescription at a regulated Mounjaro service still requires a prescriber to review your case and confirm suitability.

For a clear breakdown of what private Mounjaro typically costs, the Mounjaro pricing page sets out what's included in a transparent single price, without subscriptions or hidden fees.

What happens during the BMI check at your consultation

This is one of the questions our prescribers hear regularly: "do you just take my word for my weight?" The short answer is no. At nume, weight is verified on a live video call, not self-reported. Identity is confirmed through photo ID. It sounds thorough because it is, the GPhC expects online pharmacies prescribing weight-management medicines to have robust verification processes, and this is ours.

The consultation itself is reviewed the same day by a named GPhC-registered Independent Prescriber. A real clinician reads your answers and your verification, not software making a decision for them. If you're transferring from another provider or requesting a dose above the starter level, you'll be asked for evidence of your current treatment. That's not a bureaucratic hurdle; it's the clinical review that keeps prescribing safe.

Once approved, treatment is dispatched the same working day for orders placed before 12pm, arriving via tracked DPD delivery the next working day in plain, unbranded packaging. There are no surprises in the box, and no auto-renewal, every repeat is clinically reviewed again. If you'd like to check whether your BMI and health picture meet the criteria for Mounjaro, starting a free consultation is the straightforward next step. You can also read more about whether Mounjaro is available over the counter, the short version is that it isn't, and here's why that matters.