What Mounjaro costs per month in the UK — and what that price should include

Step 1: understand what drives the monthly price in the first place

Mounjaro comes as a pre-filled KwikPen containing four once-weekly doses, so one pen covers one month of treatment. The price of that pen shifts with the dose, the 2.5mg starter pen sits at the lower end of the market range, while the 15mg maintenance pen sits at the top. That graduated structure exists because Mounjaro pricing in the UK tracks the underlying list price Eli Lilly charges the supply chain, and higher doses cost more to manufacture.

Since the September 2025 list-price increase, providers across the market repriced accordingly. If you want a clear breakdown of what each dose tier costs over a treatment course, our guide to Mounjaro price per month sets out the figures across doses and providers as they stand. They are not fixed; individual pharmacy pricing varies, and prices can change. What you can reasonably expect is that any legitimate private prescription for tirzepatide will sit somewhere in that reported range. A price dramatically below it is worth questioning.

The dose you start on is not the dose you'll stay on. Treatment begins at 2.5mg, a pen whose job is to help your system adjust, not yet to drive significant weight change. Your prescriber titrates upward over weeks and months, so the monthly cost of Mounjaro will rise as your dose increases. Factor that into your planning from the outset.

Step 2: look past the headline number to what the price actually covers

The monthly figure displayed on a pharmacy's product page may or may not include everything you need. Some providers charge separately for the initial consultation, for the prescription itself, for repeat clinical reviews, or for delivery. A few charge nothing upfront and then add fees at renewal. It is worth reading the small print before you compare headline prices.

The things a responsible provider bundles in (and that directly affect your safety) include a genuine clinical assessment before first supply, a prescriber who reviews evidence before any dose increase, aftercare support if you have questions or side effects, and delivery that keeps the pen cold enough to remain effective. Understanding the full cost of Mounjaro means accounting for all of those, not just the medicine itself.

Mounjaro requires refrigeration at 2–8°C; most people keep their pen in the fridge door and remove it briefly before each weekly injection. A provider who ships without appropriate cold-chain packaging may save a few pounds on logistics, and cost you a pen that has been compromised in transit. That is not a theoretical risk; it is a practical one with an expensive medicine.

Step 3: what 'not the cheapest' actually means at nume

One transparent monthly price at nume covers the consultation, the prescription, the medicine itself, and free next-working-day tracked delivery by DPD. There are no subscription contracts, no auto-renewals, and no repeat supply without a fresh clinical review. We are deliberately not the cheapest option in the market, and that is a considered position rather than an oversight.

What that price buys is a named prescriber (a GPhC-registered Independent Prescriber, not a decision algorithm) reading your consultation the same day and deciding on clinical grounds whether treatment is right for you. It buys a GPhC-registered pharmacy (verifiable at registration number 9012878 on the GPhC register) dispensing from the licensed UK supply chain. And it buys seven-day-a-week aftercare support if anything comes up between deliveries.

You can see the current treatment pricing on our weight-loss treatments page. We do not publish per-pen figures in our editorial content, and we do not run discount codes or promotions, both for regulatory reasons and because a prescription medicine is not a product that should be incentivised like a retail purchase. If you see a voucher code circulating for tirzepatide from an unverified seller, that is a genuine red flag, not a bargain.

Why cheapest is the wrong test for a prescription medicine

The NICE appraisal of tirzepatide (TA1026) and the MHRA have both been clear that GLP-1 medicines are prescription-only and require clinical assessment, they are not assessed for casual or cosmetic use. The reason the legal route to Mounjaro runs through a prescriber is that the medicine carries real clinical considerations: interactions with oral contraceptives that require an additional barrier method for the first four weeks of treatment and after each dose increase, a known (if infrequent) risk of pancreatitis that needs to be understood before you start, and a titration schedule that needs clinical oversight to be safe and effective.

The MHRA has also warned repeatedly about counterfeit weight-loss pens sold online, including fake tirzepatide pens. Buying on price alone (particularly from sellers operating outside the regulated supply chain) is how people end up with an unknown substance in a pen that looks genuine. The MHRA's Yellow Card scheme exists partly to capture reports of suspect products; that tells you something about the scale of the problem.

For a fuller picture of how tirzepatide costs per month compare across the private market, or if you want to understand the clinical criteria in more detail before you start, our FAQs page covers the questions our prescribers hear most often. When you are ready to speak to a clinician, a free consultation takes only a few minutes to begin.