Mounjaro 5mg Injection Price in the UK: What the Number Really Means

Why 5mg costs more than your starter pen, and what that means for your budget

The Mounjaro titration schedule moves from 2.5mg to 5mg after approximately four weeks on the lower dose. The 2.5mg pen is purely a tolerability dose; its job is to let your body adjust before treatment begins in earnest. If you want to understand what you paid at the beginning of your journey, our dedicated page covering the Mounjaro 2.5mg injection price is a useful reference point before comparing it against what 5mg will cost you going forward. Moving to 5mg usually means a price increase, often modest, but worth factoring into your monthly budget before you start treatment rather than after.

Since Eli Lilly revised its UK list prices in September 2025, the landscape shifted significantly. Widely reported at the time, the highest-strength pen's list price rose from around £122 to around £330. Prices across all strengths moved proportionally, and most private providers adjusted accordingly. For 5mg specifically, typical private market prices since that change have sat roughly in the £149–£260 per four-week pen range, varying by provider. Those figures are hedged intentionally: the private market moves, and any number you see today may not hold next month. For the prices nume charges (sorry, that was a slip) for the prices nume charges, the treatment page is always current. You can read more about how Mounjaro pricing works at each dose if you want the fuller picture before committing to a provider.

One more thing worth knowing: if you are wondering whether prices will fall, there is a dedicated page on that question. The short version is that no definitive timeline exists, and banking on a price drop before starting treatment is a clinical decision as much as a financial one.

What headline prices on comparison sites often leave out

A quoted price for a Mounjaro 5mg pen can mean several different things depending on the provider. Some figures include the consultation fee; many do not. Some include the prescription charge; others add it at checkout. Delivery is charged separately at some clinics, often £5–£15 per order, which adds up over months. Aftercare, dose-review support and clinical re-assessment before each repeat order may be bundled in or billed as optional extras.

The result is that a headline figure of, say, £155 at one provider and £210 at another can be almost impossible to compare directly until you reach the payment screen. Some providers also structure treatment as a rolling subscription, meaning cancellation terms and auto-renewal policies matter as much as the monthly cost. There are no subscriptions at nume, every repeat order is independently re-reviewed before it is processed, and the price you see covers consultation, prescription, medicine and next-working-day delivery.

This is not a swipe at the wider market. It is a practical prompt to read the small print on any quote before the 12pm cut-off you are trying to hit on a busy weekday. A prescription medicine delivered to your door should not come with a bill you didn't expect.

Where nume sits on price, and why we are upfront about it

Cheapest is not a race we entered. That is deliberate. A single transparent price at nume covers everything: the consultation, the prescription, the medicine, and free next-working-day tracked delivery via DPD. The clinical team (led by our Independent Prescriber) personally reviews every consultation the same day. There are no discount codes, no seasonal sales and no vouchers, because a prescription-only medicine is not a product you should feel incentivised to rush into on a deal.

We run photo-ID identity verification and live weight verification on video. For patients transferring from another provider or requesting a dose increase, we check evidence of current treatment. None of that is bureaucracy for its own sake; it is what responsible prescribing of a Black Triangle medicine looks like in practice. You can find answers to the most common questions on our FAQ page, or get in touch if something specific is not covered there.

The Mounjaro 5mg pen is one step in an ongoing treatment. What you are really purchasing over the months ahead is clinical oversight, and that is where the value comparison should start.

Why 'cheapest' is the wrong test for a prescription-only medicine

The MHRA has warned repeatedly about counterfeit weight-loss pens circulating online and through social media. In late 2025 alone, enforcement action uncovered roughly 20 million doses of illegally traded weight-loss medicines worth around £45m, and the first UK site manufacturing fake tirzepatide pens was raided. Some counterfeit pens have been found to contain insulin rather than tirzepatide, a serious, potentially life-threatening distinction. You can verify any online pharmacy against the GPhC register at pharmacyregulation.org, nume's registration number is 9012878.

A small saving on a single pen is not the measure that keeps you safe. The question is whether the supply chain behind the price is legitimate, whether a qualified prescriber actually reviewed your health before dispensing, and whether anyone is monitoring your treatment as it progresses. The NHS medicines page for tirzepatide sets out clearly that it is a prescription-only medicine requiring ongoing clinical oversight, not a product that can be assessed by a questionnaire algorithm and posted out. If a price looks far below market, it is worth checking what the 2.5mg starter pen costs at a legitimate provider to give yourself a sensible baseline before you commit. Similarly, patients planning ahead sometimes find it useful to look up the 10mg pen price early, so the full cost of treatment is not a surprise further down the line. You can also see what the 7.5mg pen costs once you reach that stage of titration, which helps you plan your budget across the full titration schedule. Report suspect sellers via the MHRA Yellow Card scheme.

The right starting point is a free consultation with a clinician who has access to your health history and the authority to prescribe. Speak to our prescribers, it costs nothing and puts a qualified professional in charge of the decision.