Will a doctor give you weight loss injections — and what decides the answer?

The choice in front of you: NHS GP or a regulated private prescriber?

When people ask whether their doctor will prescribe a weight loss injection, they usually mean one of two things: will their NHS GP do it, or is there another route? Both are legitimate questions, and the honest answer is that they have very different answers right now.

On the NHS, tirzepatide (Mounjaro) is being phased in gradually under NICE's appraisal TA1026. From around June 2025, the first cohort eligible was adults with a BMI of 40 or above and four or more of five specific conditions: high blood pressure, high cholesterol, obstructive sleep apnoea, cardiovascular disease, or type 2 diabetes. A second cohort (BMI 35–39.9, also with four or more of those conditions) became eligible from around June 2026. GP practices can prescribe under the 2026/27 contract, but participation varies by practice and area, so your GP may or may not be set up for it yet.

Wegovy (semaglutide) is available on the NHS too, but under NICE guidance (TA875) it is recommended only within specialist weight management services, which often means long referral waiting lists. Eligibility thresholds are similar, and patients must be supported within a multidisciplinary programme for up to two years.

If your situation does not fit those NHS criteria right now, or if waiting is not workable, a private prescription from a regulated prescriber is the other legal route. That is what services like nume offer: a real clinical assessment, carried out by a GPhC-registered Independent Prescriber, against the same licensed eligibility standards.

What a prescriber is actually weighing up

A question our prescribers hear most weeks is: 'My BMI is 31, will I definitely qualify?' The honest reply is that your BMI is one factor among several, not the whole picture.

A prescriber considering whether to give you a weight loss injection will look at your BMI, but also at whether you have any of the relevant weight-related conditions, your current medications (some interact with GLP-1 medicines), your medical history, and whether there are any contraindications. A history of certain thyroid conditions, pancreatitis, or specific gastrointestinal problems, for instance, would need careful discussion. Pregnancy, breastfeeding, or plans to conceive are also reasons these medicines are not suitable. The prescriber is building a picture, not running a calculation.

Lower BMI thresholds (2.5 kg/m² below the standard figures) apply for people of South Asian, Chinese, Middle Eastern, Black African or African-Caribbean backgrounds, reflecting UK guidance on how weight-related health risks differ across ethnic groups. If you are unsure whether that applies to you, it is worth raising at your consultation.

The licensed medicines are Mounjaro and Wegovy. You can read the clinical detail on the NHS tirzepatide page and in NHS England's broader guidance on weight management injections. Both are worth reading before your appointment, whichever route you take.

Why 'will my doctor give me the weight loss injection' has no universal answer

The frustrating truth is that two people with identical BMIs and similar health profiles might get different answers depending on who their GP is, which area they live in, and when they ask. If you are wondering whether your GP will give you weight loss injections, the answer depends on NHS rollout progress, participation by GP practices, and specialist service capacity, none of which reflects on the clinical case for treatment, only the practical reality of rolling out medicines at scale.

That is why understanding what the private route looks like is useful information, not a workaround. A private prescriber assessing weight loss injections applies the same licensed eligibility criteria as an NHS prescriber would. The difference is the absence of a waiting list and the absence of the NHS's phased cohort structure. If you meet the clinical criteria, treatment can follow from a single assessment.

If you want to understand your position before committing to anything, our FAQs cover the most common eligibility questions. For anything more specific to your circumstances, the right place is a consultation. There is no obligation and no cost to check your eligibility with us.

What happens if your GP says no right now

A GP declining to prescribe is not necessarily a final answer. It may mean you fall outside the current NHS cohort, that your practice has not yet enrolled, or that more information is needed. It is worth asking which of those applies, the answer shapes your next step.

If it is a cohort or practice issue, the NHS route may open up for you later. People often ask whether their GP can give them weight loss injections and find that a clinical concern, rather than a cohort issue, is behind the refusal; if that is the case, the same concern will apply to private prescribing too, and it is important to be transparent about it in any consultation you attend. A good prescriber wants to understand the full picture. If you are also curious about whether your doctor can give you weight loss injections through a private route rather than via the NHS, that question has its own nuances and is worth reading through before your next conversation with a clinician.

People who want to explore their options without waiting can find out more about how to get weight loss injections privately through a regulated service. At nume... at our consultation page, you complete a clinical questionnaire that a GPhC-registered prescriber reads in full the same day. If you are suitable, treatment can be dispatched the same day you are approved, arriving free the next working day. If you are not suitable, you are told clearly and honestly. That is what a clinical assessment is supposed to feel like.