What's the cheapest weight loss injection available in the UK?

Why is there such a wide range of prices for the same injection?

A misconception worth setting aside gently: many people assume that two providers selling the same drug at different prices are offering the same thing at different margins. That's often not the case. Private weight loss injections (Mounjaro and Wegovy are the two licensed options in the UK for weight management) are prescription-only medicines. That means every legitimate supply must be accompanied by a clinical assessment, a valid prescription, and regulated dispensing through a GPhC-registered pharmacy.

When a headline price looks attractively low, it is worth checking what it excludes. Consultation fees are sometimes charged separately. Prescription fees can sit on top. Delivery charges vary. Ongoing clinical support (the people you contact if you feel unwell mid-treatment or have a question about your next dose) may be absent entirely, or available only at extra cost. A price that looks like a saving can quietly become the most expensive route once those items are added back. Understanding what the cheapest weight loss injections actually include helps you compare like with like.

Since Eli Lilly raised the UK list price of Mounjaro from 1 September 2025 (with the highest-dose pen rising from around £122 to around £330 at list price) private providers have repriced across the board. Typical private prices since then range roughly £149 to £375 per month depending on the dose and the provider, as widely reported. These figures are a starting point, not a guarantee. The right dose for you is a clinical decision, not a shopping choice.

What does a genuinely all-inclusive price actually cover?

At nume, one price covers the consultation, the prescription, the medicine, and tracked next-working-day delivery to your door. We don't add fees at the end. We don't run a subscription that renews without you noticing. There's no separate charge for aftercare if you have a question on a Sunday. We are not the cheapest option in the market, and that is a deliberate choice: the overhead of doing this properly (photo-ID checks, live weight verification, same-day clinical review by a named prescriber, Summary Care Record checks where appropriate, GP notification in line with GPhC guidance) costs something. We'd rather be transparent about that than paper over it with a low opening number.

If you want to know exactly what our treatment costs, our treatment page sets that out clearly. What it won't show is a discount code box, because we don't run promotions on prescription medicines. The clinical team who oversees our prescribing takes the view that offering vouchers on a POM sends the wrong signal about what you're actually buying.

You can verify that we are a legitimate GPhC-registered pharmacy at any time, our premises registration number is 9012878, verifiable directly on the GPhC register. That takes thirty seconds and is one of the most useful checks you can run on any online pharmacy.

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

Probably not, and the MHRA has been direct about why. Fake weight loss pens have been seized in the UK in significant numbers: in 2025 alone approximately 20 million doses with an estimated street value of around £45 million were intercepted, and the first domestic manufacturing site producing counterfeit tirzepatide pens was raided in October 2025. Some counterfeit pens have contained insulin. The draw for sellers operating outside the law is exactly the same as the draw for buyers: weight loss injections are in high demand and prices are high. Understanding what the cheapest weight loss injection in the UK genuinely looks like in a regulated setting makes it easier to spot sellers who have left the licensed supply chain entirely, often by undercutting the market substantially.

The MHRA's public guidance on GLP-1 medicines and their safe use makes clear that these medicines should only be obtained with a valid prescription following clinical assessment. Red flags include sellers who supply without asking for a consultation, prices that sit well below the current market range, and discount codes from unknown sources for prescription-only medicines. If you encounter any of these, you can report the seller through the Yellow Card scheme. The right metric for a weight loss injection isn't how little you paid. It's whether the medicine is genuine, prescribed appropriately, and supported by someone who will still be there if something goes wrong.

How does the NHS route compare on cost?

NHS prescribing of tirzepatide (Mounjaro) for weight management is now beginning through GP practices under the 2026/27 contract, following NICE's recommendation in TA1026. The criteria are strict: current NHS commissioning targets adults with a BMI of 40 or above and four or more qualifying conditions, with further cohorts being added in phases. If you meet those criteria and your GP practice is participating, NHS treatment carries no prescription charge for the medicine itself. Most people asking about price do not yet qualify under those criteria, or would face a long wait within specialist weight management services.

Private treatment through a regulated online pharmacy is the practical alternative for people who fall outside those thresholds or who want to start sooner. It costs more than nothing. It costs less than months of delay for many people who are managing conditions that worsen with time. Our overview of weight loss treatment options sets out both routes side by side, without pushing you toward either. If you are weighing up your options and wondering which is the cheapest weight loss injection for your situation, our FAQs cover that alongside the questions we hear most often about cost, eligibility and how the process works. If you're ready to find out whether you qualify, check your eligibility with a free consultation and a prescriber will review your answers the same day.