Your right to choose weight loss injections: what the rules actually say

The misconception: a licensed medicine at the right BMI means automatic access

The most common misunderstanding our prescribers encounter is this: patients believe that because Mounjaro or Wegovy is clinically licensed, and because their BMI appears to meet the threshold, they are entitled to a prescription. It is understandable, the language of "eligibility criteria" sounds like a checklist you either pass or fail. But UK prescribing does not work that way.

Prescribing a medicine is a clinical act, not an administrative one. A GPhC-registered Independent Prescriber reviews your full health picture: your weight history, other conditions, current medicines, contraindications, and whether the likely benefit outweighs the risk for you specifically. BMI alone does not guarantee approval, and a prescriber who supplies a POM without that assessment is acting outside the law. That is not a bureaucratic inconvenience, it is the mechanism that keeps you safe.

So the honest answer to "do I have a right to choose weight loss injections" is: you have a right to a thorough, unbiased clinical assessment. You do not have a right to override that assessment. What you do have (and this matters) is the freedom to choose where you access that assessment, and from whom.

What NHS eligibility actually covers, and where private treatment fits

NICE's appraisal of tirzepatide (TA1026) sets out the NHS commissioning criteria: broadly, adults with a BMI of 35 or above plus at least one qualifying weight-related condition, within a specialist setting. Lower BMI thresholds apply for some ethnic backgrounds under NICE's published guidance. The NHS is rolling out access in phases through 2025 to 2027; Cohort 2 (BMI 35–39.9 with four or more qualifying conditions) became available from June 2026.

Those criteria deliberately target the people with the most complex clinical need. They do not mean that everyone else is excluded from treatment, they mean that the NHS, with finite resources, is prioritising a specific group. Private treatment through a regulated pharmacy operates under the same SmPC eligibility (broadly, BMI ≥30, or ≥27 with a qualifying weight-related condition) but is funded by you rather than the NHS. If you do not meet the NHS threshold, cannot get a referral, or simply do not want to wait, the private treatment route is a lawful and clinically supervised alternative. You can read more about what private treatment typically costs and what a transparent price should include.

The Private route is not a shortcut around clinical assessment. It is a different access point to the same assessment.

What happens when you choose a private prescriber, and what arrives

At a GPhC-registered online pharmacy like nume, the process starts with a free consultation: you answer questions about your health, weight history and current medicines. A named prescriber (a real clinician, not software) reads your answers the same day. If they approve treatment, identity and weight are verified before anything is dispensed. Your medication then travels via DPD in plain, unbranded packaging, with a tracking link sent to your phone. The pen itself is the same Eli Lilly or Novo Nordisk product dispensed through any UK pharmacy, sourced through the licensed UK supply chain.

That supply-chain detail matters. The MHRA has issued repeated warnings about counterfeit weight-loss pens sold online and via social media. Some fake pens have contained insulin. The only safe route to these medicines is a prescription, issued after clinical assessment, from a pharmacy you can verify on the GPhC register. You can also read guidance from the MHRA's Yellow Card scheme on reporting suspect sellers.

For practical guidance on starting treatment safely, the how to use weight loss injections page covers technique, storage and what to expect at each stage.

What your prescriber decides, and where your voice counts

A prescriber is not obliged to prescribe a medicine you request. They are obliged to treat you with clinical respect, explain their reasoning, and point you toward the right next step if treatment is not appropriate for you right now. If they decline, they should tell you why. If you are already established on treatment elsewhere and want to transfer, you can, but a new prescriber will want to see evidence of your current dose and weight history before continuing or increasing.

Your choice does count, though. You can choose which licensed medicines you learn about before your consultation. You can raise preferences with your prescriber. And if you have already lost weight and are asking about related concerns, such as skin changes after significant weight loss, those are legitimate clinical conversations too. Treatment is not one decision made once, it is an ongoing clinical relationship, reviewed before every repeat order at a responsible pharmacy.

The dietary choices you make alongside treatment also influence how well it works. Prescribers at a reputable service will be interested in that picture, not just your BMI. If you want to understand what clinical suitability looks like for you specifically, and whether your goals are realistic, our guidance on using weight loss injections to lose 1 stone is a useful starting point before booking a consultation with a qualified prescriber.