What Are the Requirements for Mounjaro? A Clear Eligibility Guide

What BMI do you need to start Mounjaro?

The licensed eligibility criteria, set out in Mounjaro's Summary of Product Characteristics and reflected in NICE's appraisal of tirzepatide (TA1026), centre on two routes. The first is a BMI of 30 or above with no further conditions required. The second is a BMI between 27 and 29.9, provided you also have at least one weight-related comorbidity, conditions in this category include type 2 diabetes, prediabetes, high blood pressure, dyslipidaemia (raised cholesterol or triglycerides) and obstructive sleep apnoea.

Those figures are not fixed for everyone. For adults from South Asian, Chinese, Middle Eastern, Black African or African-Caribbean backgrounds, UK guidance applies a 2.5 kg/m² reduction to both thresholds. So in practice the lower route opens at a BMI of around 24.5 with a comorbidity, and the upper route at around 27.5. If you want to check where your own BMI sits, the NHS BMI calculator is a useful starting point before your consultation. Our detailed guide to the BMI requirement for Mounjaro covers this in full.

One thing worth knowing: BMI is a screening tool, not a verdict. A prescriber uses it alongside everything else (your health history, current medicines, any contraindications) to decide whether Mounjaro is appropriate for you specifically.

Which medical conditions count as qualifying weight-related comorbidities?

If your BMI falls in the 27–29.9 range, the question of which conditions qualify becomes important. The list drawn from the licensed indication and the NICE appraisal includes type 2 diabetes, prediabetes, hypertension, dyslipidaemia, obstructive sleep apnoea and, in some clinical frameworks, osteoarthritis. These are conditions where excess weight is known to worsen outcomes and where weight reduction carries direct health benefit.

A diagnosis does not need to be decades old or particularly severe, even a recent diagnosis of high blood pressure, for example, can meet the threshold. What matters is that the condition is real, documented and clinically relevant to your weight. At your consultation, our prescribers will ask about your medical history and may request that you share relevant details from your GP records. You can read more about the full criteria for Mounjaro if you want to see how these conditions are assessed.

The clinical picture also includes things that rule Mounjaro out. A personal or family history of medullary thyroid carcinoma or multiple endocrine neoplasia type 2 (MEN2) are absolute contraindications. A history of pancreatitis or significant gastrointestinal conditions requires careful prescriber discussion. These exclusions exist because tirzepatide's mechanism involves gut-hormone pathways that can interact with these conditions in serious ways.

Are the requirements different on the NHS versus a private prescription?

Yes, and the difference is significant. For a private prescription through a regulated online pharmacy like nume, the requirements mirror the licensed indication: BMI 30-plus, or 27-plus with a qualifying condition, assessed by a prescriber who is satisfied there are no contraindications. There is no waiting list, no referral and no requirement to have tried other interventions first, though the prescriber will consider your full history.

On the NHS, NICE's TA1026 recommendation sets tighter, phased criteria. Currently (and these are rolling out in stages through 2025 and 2026) NHS tirzepatide is targeted at adults with a BMI of 40 or above alongside four or more specific weight-related conditions. A second cohort covering BMI 35–39.9 with four or more conditions became eligible in June 2026. Each NHS patient must also participate in a wraparound diet and activity programme. The gap between what the licence permits and what the NHS currently commissions is why many people who are clinically eligible are choosing the private route. Our page on Mounjaro requirements explains both pathways side by side.

If cost is part of your thinking, it is worth understanding what a private prescription actually covers. Our Mounjaro pricing page sets out what is included in a single transparent price, with no subscription and no hidden fees.

What else does a prescriber check before approving Mounjaro?

BMI and comorbidities open the door. What a prescriber then looks at is whether there is anything that would make Mounjaro unsafe or unsuitable for this particular person. Age is one factor: Mounjaro is not licensed for anyone under 18, and the evidence base does not extend to children or adolescents. Pregnancy, breastfeeding and actively trying to conceive are also clear contraindications, women of childbearing age are advised to use effective contraception while on treatment.

Current medicines matter too. Tirzepatide slows gastric emptying, which affects how some oral medicines are absorbed. For women taking the oral contraceptive pill, prescribers follow MHRA guidance to add a non-oral method of contraception for the first four weeks of treatment and for four weeks after each dose increase, because pill absorption may be reduced during that window. If you have type 2 diabetes and are wondering how your blood sugar control affects eligibility, our guide to Mounjaro A1C requirements explains what prescribers look at and why it matters. This is practical information you will hear about in your consultation, not a reason to rule treatment out.

At nume, every consultation is read by a GPhC-registered Independent Prescriber on the same day, a clinician, not an automated filter. They review your answers, verify your identity and your current weight via live video, and check your Summary Care Record where appropriate. If they have questions, they ask them. Our clinical team takes that responsibility seriously. It is the same standard of scrutiny whether you are new to treatment or transferring from another provider, and you can learn more about how we work before you start. Keep your Mounjaro pen in the fridge door until your injection day, it is a small habit that makes the weekly routine feel automatic.

If eligibility is confirmed and treatment is prescribed, dispatch follows the same day for orders placed by midday Monday to Friday, arriving via tracked DPD delivery the next working day. Ready to find out whether you meet the requirements? Start your free consultation and a prescriber will review your details the same day.