How much Mounjaro do you inject, and how does that affect the price?

You've looked at prices online and the numbers don't seem to add up

You're not imagining it. Private Mounjaro pricing in the UK is genuinely variable, and much of that variation comes from one fact: the dose you inject determines the pen you receive, and the pen's cost is not fixed across providers. Since Eli Lilly raised its UK list price on 1 September 2025 (the 15 mg pen's list price rose from around £122 to around £330) private market prices across providers have ranged roughly £149 to £375 per month depending on the dose and the service. Those figures are widely reported and are the honest market context, though they should be treated as approximate; actual prices vary and move.

The practical implication is that starting doses cost less than maintenance doses. A patient on 2.5 mg is paying for the lowest-strength pen. Someone who has titrated to 15 mg (with clinical sign-off at each step) is paying for the highest. So when you search for a price and see a single headline figure, it is almost always the entry-level dose. What you'll actually pay depends on where your prescriber settles your treatment, and if you're unsure how much tirzepatide to inject at each stage of treatment, that guidance is worth reading before you compare costs. The full cost breakdown for Mounjaro injections lays this out dose by dose if you want to compare figures properly.

One quick habit worth building: before you hand over payment to any online provider, look them up on the GPhC pharmacy register. It takes under a minute, and a legitimate pharmacy will be there. If it isn't, that's the answer you need.

What headline prices often leave out, and why the gap matters

The figure in the advertisement is rarely the figure on your final receipt. Consultation fees, prescription charges, and delivery costs are frequently listed separately, or not listed at all until checkout. Some providers charge for dose reviews, others charge for the aftercare calls that ought to follow a dose increase. A few charge nothing upfront and bill more for the medicine itself.

This matters because Mounjaro is a titrated medicine. Your starting dose is unlikely to be your permanent dose. Each step up requires a clinical review; if that review costs extra, the maths across six or twelve months shifts considerably. Our overview of what Mounjaro injections typically cost walks through the items that separate a genuinely all-in price from a headline one, it's worth reading before you commit anywhere.

At nume, a single price covers the consultation, the prescription, the medicine, and next-working-day tracked delivery. There is no consultation fee added at the end, no prescription surcharge, and no delivery charge. Clinical re-review happens before every repeat order. We don't run discount codes or vouchers; for a prescription medicine, a promotional code from an unverified seller is a red flag, not a perk. What that means practically is that what you see on our treatment page is what you pay.

Why we're not trying to be the cheapest option, and what that actually costs you

We lose the price comparison on purpose. Not because we can't compete, but because competing on price in this market would mean cutting something that matters: the consultation depth, the same-day prescriber review, the aftercare structure, or the supply chain assurance. Mounjaro is sourced through the licensed UK supply chain; every pen arrives via Eli Lilly-authorised routes. That's not negotiable for us, and it's not free.

The MHRA has been explicit about the risks of purchasing weight-loss medicines from unverified online sellers. Fake pens have reached patients (some containing insulin rather than tirzepatide) and enforcement through 2025 led to the seizure of around 20 million doses with an estimated street value of roughly £45 million. You can read the MHRA's guidance at the Yellow Card portal, which also lets you report suspect sellers. For a prescription medicine, the right question is not which provider is cheapest but which one is giving you genuine clinical assessment, genuine supply, and somewhere to turn if something feels wrong.

If you want to understand the broader tirzepatide cost picture (including how private pricing compares to what NHS access currently looks like) our Mounjaro price guide covers it. And if generic tirzepatide is something you've seen mentioned, our page on tirzepatide generic costs explains where that stands in the UK right now.

What a clinically safe starting point looks like in practice

The first step is a consultation, free with us, and read the same day by a prescriber registered with the GPhC. They look at your BMI, your medical history, any medicines you're already taking, and your goals. If Mounjaro is appropriate, they issue a private prescription; if it isn't, they'll tell you that too, and why. There's no pressure either way.

If approved, your order is dispatched the same day provided it's placed before midday on a working day. It arrives by DPD the next working day in plain packaging, temperature-controlled for the journey. Changes to your appetite on Mounjaro can be noticeable from early in treatment, our clinical team is available seven days a week if questions come up. Before any dose increase, a prescriber reviews your progress again; the cost of that review is included.

The Mounjaro overview page covers the mechanism, the trial evidence, and the eligibility criteria in more detail. If you'd like to understand the weight-loss evidence before you start, our summary of typical weekly weight loss on Mounjaro puts the SURMOUNT trial results in plain terms. When you're ready to talk it through with a prescriber, check your eligibility here.