How to get the new weight loss injection in the UK

You've found the injection, now the clock is ticking on getting it right

Most people land on this page having already done the research. You know the names (Mounjaro, Wegovy) you've probably seen them on your social media feed and read about the trial results. What you need now is the practical part: how do you actually get one, legally, without ending up with a fake pen from an unverified seller?

Start with the legal baseline. Mounjaro (tirzepatide) and Wegovy (semaglutide) are both Prescription-Only Medicines under the Human Medicines Regulations 2012. A registered prescriber must assess your health, confirm you meet the clinical criteria, and issue a valid prescription before any medicine can be dispensed. There is no legitimate shortcut around that step. The NHS England guidance on weight management injections sets out the clinical framework that every UK prescriber follows.

Once you have a prescription, the medicine must come from a pharmacy you can verify. The General Pharmaceutical Council (GPhC) maintains a public register of every legally operating UK pharmacy. You can check any online pharmacy (including ours) by searching the GPhC register (our registration number is 9012878). If a seller isn't listed there, stop. That's the whole check, and it takes thirty seconds.

The MHRA has issued stark warnings about fake weight loss pens circulating online and through social media. In 2025 alone, around 20 million doses of illegally traded weight loss medicines (worth roughly £45 million) were seized, and enforcement teams raided the first UK site manufacturing counterfeit tirzepatide pens. Some fake pens have contained insulin rather than the labelled medicine, with serious consequences for the people who used them. Report anything suspicious at yellowcard.mhra.gov.uk.

What clinical eligibility actually looks like for these injections

The licensed criteria for private prescribing are set out in each medicine's Summary of Product Characteristics. For both Mounjaro and Wegovy, the threshold is a BMI of 30 or above, or a BMI of 27 or above alongside at least one weight-related health condition, things like high blood pressure, type 2 diabetes, high cholesterol, or obstructive sleep apnoea. Lower BMI thresholds apply for some ethnic backgrounds under UK guidance.

BMI alone doesn't determine the outcome. A prescriber weighs your full medical history: current medicines, past conditions, family history, whether you're pregnant or breastfeeding (these injections aren't suitable in either case), and any contraindications specific to you. The consultation exists precisely because these judgements are individual.

You can read more about what the NHS criteria look like, and how they differ from private access, on our page covering weight loss injections on the NHS. The short version: NHS access is phased and restricted by condition count and BMI thresholds that are still tightening; private treatment through a regulated pharmacy is the route for people who don't meet those criteria yet, or who'd rather not wait.

For a broader look at all the injectable options currently available in the UK, the weight loss injections overview is a good place to start.

How the process works at nume, from consultation to pen in the fridge

The process at nume is built around the clinical review, not around speed for its own sake. If you are wondering how to get the weight loss injection started safely, you complete a free consultation online, your health history, your current medicines, a photo-ID check, and a live weight verification on video. That whole package goes to a GPhC-registered Independent Prescriber, who reads it personally and makes a clinical decision the same day.

If treatment is appropriate, a prescription is issued and your order is dispensed from our own GPhC-registered pharmacy (registration 9012878). Order before 12pm on a working day and your pen is dispatched the same day, arriving via DPD with tracked next-working-day delivery in plain, unbranded packaging. Most people find the practical routine settles quickly, the pen lives in the fridge door alongside everyday items, you dose once a week, and that's the week's administration done.

Every repeat order gets the same clinical re-review. There are no subscriptions, no auto-renewals, and no hidden fees. One price covers consultation, prescription, the medicine, and delivery. Our clinical team is available seven days a week if a question comes up between orders. If you want to know more about what the service involves before starting, the FAQs cover the most common questions we hear.

If you'd like to explore everything included in a nume consultation and compare the treatment options side by side, the treatment page is the right place. We also have dedicated guidance on how to get weight loss injections through a regulated UK service, as well as information on how to get the weight loss injection on the NHS if that route suits your circumstances better, and a local guide for anyone looking into private weight loss injections in Birmingham. There's no cost to find out whether you're eligible, and a prescriber, not an algorithm, will tell you.