How Much Do Weight Loss Injections Cost in the UK?

What does a private weight loss injection actually cost in the UK?

Across the UK private market, weight loss injections (principally Mounjaro (tirzepatide) and Wegovy (semaglutide)) are priced per pen, with each pen covering four weekly doses. Reported monthly costs run from roughly £149 at the starter dose to around £375 at the highest maintenance doses, though figures vary by provider and have moved upward since the Lilly list-price change in autumn 2025. These are the only £ figures you'll see here, because quoting exact per-pen prices in body copy serves no one: your dose will change as treatment progresses, so the number that matters is what you'll pay month to month at the dose your prescriber selects.

Both medicines are licensed for weight management in adults with a BMI of 30 or above, or 27 and above with a qualifying condition such as high blood pressure or type 2 diabetes. More background on how weight loss injections work is useful reading before any consultation. Tirzepatide and semaglutide are both Black Triangle medicines, subject to additional MHRA monitoring, a detail that underlines why a proper clinical assessment matters, not just a price comparison.

One practical note: if you're ordering before 12pm on a working day, same-day dispatch is possible once clinical review is complete. That cut-off catches most people before the school run, which is how it tends to work in practice.

Why does the quoted price vary so much between providers?

Headline prices in weight loss injection advertising often reflect only the cost of the medicine itself. The consultation, the prescription, the delivery and any clinical support between orders can all be charged separately, or not at all, depending on the service. A provider quoting £149 per month and one quoting £250 may not be offering comparable services; the difference might simply be what's been bundled into the number you see.

Common extras that are not always included: an initial consultation fee (sometimes charged whether or not you're approved), a prescription fee on top of the medicine price, delivery (next-day tracked services cost money), and clinical aftercare between orders. If a dose increase requires a new assessment, that may trigger another charge. Understanding what a price covers is more useful than ranking services by the headline figure alone. You can find a more detailed breakdown on our private weight loss injection pricing page.

nume's position on this is deliberate: one transparent price covers the consultation, prescription, medicine, delivery and ongoing clinical support. We don't offer the lowest number. We offer a price where the number means what it says. Our clinical team page sets out the structure of the service for anyone who wants to check before they start.

Is 'cheapest' the right question to ask about a prescription medicine?

For most purchases, the lowest price is a reasonable starting point. For a prescription-only medicine dispensed through a supply chain you can't inspect, it's the wrong test entirely. The MHRA has warned publicly about counterfeit weight loss pens sold online, fake pens containing incorrect or dangerous substances, some linked to hospitalisations. In 2025 enforcement actions recovered approximately 20 million doses of illegally traded weight loss medicines (around £45 million street value), and a site producing counterfeit tirzepatide pens was found operating in the UK. You can report a suspect seller directly to the MHRA via Yellow Card.

The reliable check is the GPhC register. Any legitimate online pharmacy dispensing prescription medicines in the UK must be registered with the General Pharmaceutical Council. You can verify nume's registration on the GPhC register directly. A price far below the market range, a seller operating via social media, or an offer of these medicines without a clinical assessment first: these are red flags, not bargains. For a prescription medicine, the right metric is whether the supply is genuine, the clinical review is real, and the support exists when you need it. Our page on cheap weight loss injection offers covers the warning signs in more detail.

Ready to see whether you're eligible? Start your free consultation with our prescribers.