What Does the Cost of Weight Loss Injections Really Include?

What UK guidance says about these medicines, and why price follows the prescription

NICE's appraisal of tirzepatide (Mounjaro), published in December 2024 and updated in September 2025, confirmed it as the most effective licensed weight management medicine currently available in the UK, with trial participants losing an average of around 20–21% of their body weight over 72 weeks at the highest dose. You can read the full recommendation at NICE technology appraisal TA1026. Semaglutide (Wegovy) produced average losses of around 15% over 68 weeks in its pivotal trial, as detailed in the STEP 1 paper in the New England Journal of Medicine.

Both medicines are Prescription-Only. UK law requires a prescriber to assess your suitability before any supply, which means a legitimate cost of weight loss injections always includes that clinical step, whether it is itemised separately or bundled in. If a price you see online does not mention a prescription or a prescriber, that is worth pausing on.

Eli Lilly raised Mounjaro's UK list price from 1 September 2025; widely reported figures put the highest-dose pen's list price at around £330 per four-week pen, up from around £122 previously. If you are trying to understand what weight loss injections near you are likely to cost, private clinic prices across the market have since ranged roughly £149–£375 per month by dose and provider, figures that should be treated as indicative, since they shift as supply and competition evolve.

What headline prices for weight loss injections often leave out

A single-line price on a website can look straightforward. In practice, the full cost of weight loss injections tends to involve more moving parts than that figure suggests. Consultation fees are sometimes added at checkout rather than shown upfront. Prescription charges may be separate. Delivery costs (especially for a cold-chain medicine that needs a reliable courier) are not always included. Aftercare, the ongoing clinical support you need when you increase your dose or hit a side effect, is often available only on a paid tier or via a phone line with long wait times.

Dose increases are another consideration. Treatment almost always starts at a low dose and rises over several months as your prescriber judges it appropriate. Some providers price each dose separately; others charge differently for starter and maintenance pens. The full picture of what weight loss injections cost over a course can look quite different from the opening monthly figure.

A useful check you can do in under a minute: search the provider's name on the GPhC pharmacy register. If they are not listed as a registered pharmacy, they cannot legally dispense prescription medicines in the UK. It takes thirty seconds and it tells you something no price comparison can.

Where nume sits, and why that is a deliberate choice

We are not the cheapest option. That is a choice, not an oversight. One transparent price covers the consultation, the prescription, the medicine, next-working-day tracked delivery and seven-day aftercare, no separate line items, no tiered support packages. Every repeat order goes back to a prescriber for review before anything is dispensed; there is no auto-renewal that skips that step. Our pharmacy is GPhC-registered (premises number 9012878), and all medicines move through the licensed UK supply chain.

If you want to compare lower-cost weight loss injection options, that page sets out what to look for and what to ask. The short version: what a provider includes matters as much as the number they lead with. Current pricing for treatment through nume is shown on our weight loss treatments page, we do not print per-pen prices in article copy because they change, and a number here can be out of date before you read it.

Why cheapest is the wrong question to ask about a prescription medicine

For a pair of trainers, price is a reasonable starting point. For a prescription-only medicine that changes how your body regulates appetite, it is the wrong question entirely. The MHRA has warned publicly about fake weight loss pens sold through unverified online sellers and social media, counterfeit pens have been found to contain insulin rather than the stated medicine, with serious consequences for people who used them. In 2025 alone, around 20 million doses of illegally traded weight loss medicines (with an estimated street value of around £45 million) were seized, and the first illicit UK site manufacturing fake tirzepatide pens was raided. You can report any suspect seller directly through the MHRA Yellow Card scheme.

The metrics worth applying to weight loss injections are these: Is the pharmacy on the GPhC register? Does a real prescriber review your consultation? Is the medicine sourced through the licensed UK supply chain? If the answer to any of those is unclear, a lower price is not a saving. More background on how the NHS and private routes compare on cost may help if you are weighing your options. Our about us page covers how we are set up and who oversees clinical decisions at nume.