Tirzepatide brand name: what it is and why it matters

What brand name is tirzepatide sold under in the UK?

Tirzepatide has one brand name in the UK: Mounjaro. Eli Lilly, the American pharmaceutical company that developed the medicine, holds the UK marketing authorisation and supplies it through the licensed UK supply chain. If you have seen other names attached to tirzepatide online (particularly Zepbound) it is worth knowing that Zepbound is the US brand name for the same molecule. It does not have a UK marketing authorisation, is not stocked by UK pharmacies, and is not obtainable through any legitimate UK route.

The tirzepatide brand name question comes up constantly because people encounter different terminology depending on where they search. In the UK, the answer is always Mounjaro. The medicine comes as a pre-filled KwikPen, with each pen containing four weekly doses across the six licensed strengths: 2.5, 5, 7.5, 10, 12.5 and 15 mg. The NHS tirzepatide medicines page is a reliable place to check the current licensed details.

There is no generic or off-brand tirzepatide available anywhere in the world right now. Eli Lilly's patent protects the molecule, so any product claiming to be tirzepatide but sold under an unofficial name (or at prices far below the established market) should be treated as a serious red flag.

Is there an off-brand or generic version of tirzepatide available?

No. Tirzepatide off-brand or generic versions do not legally exist in the UK, or in any market where it is licensed. The molecule is still under patent, which means only Eli Lilly can manufacture it for commercial sale. Pharmacies that dispense Mounjaro must source it through the authorised supply chain; there is no cheaper, equivalent substitute to reach for.

This matters because counterfeit products labelled as tirzepatide have appeared on social media and through unofficial online sellers. The MHRA has warned publicly (and taken enforcement action, including raiding a UK site producing fake tirzepatide pens in late 2025) about the real danger of these counterfeits. Some fake pens seized in earlier operations contained insulin rather than the medicine on the label. A product claiming to be tirzepatide that arrives without a proper prescription process behind it is not a bargain: it is an unknown substance.

If you want to be certain your medication is genuine, check that the dispensing pharmacy is listed on the GPhC register. That takes under a minute and is the simplest way to confirm a pharmacy is regulated. Read more about the different tirzepatide brands in each market and why only Mounjaro applies in the UK.

How does knowing the brand name help when researching treatment?

When you know tirzepatide's UK brand name is Mounjaro, you can search with more precision and sidestep a lot of misleading content. Queries about what brand is tirzepatide often surface a mix of UK and US results, and the pricing, regulatory status and even the licensed dosing presentations differ substantially between markets. A page discussing Zepbound's US list price, for instance, tells you nothing useful about accessing tirzepatide in the UK.

Mounjaro has NICE approval (TA1026) for weight management in adults with a BMI of 35 or above alongside at least one weight-related condition, with lower BMI thresholds applying for certain ethnic backgrounds under UK guidance. On the private route, the licensed SmPC eligibility (a BMI of 30 or above, or 27 or above with a relevant condition) is what a prescriber works from. The full Mounjaro overview covers eligibility, the titration schedule and what to expect from treatment in detail.

It is also worth understanding how the brand name question intersects with cost. Eli Lilly raised Mounjaro's UK list price substantially from September 2025 (the highest-dose pen's list price moved from around £122 to around £330 per four-week pen) and private market prices typically sit between those figures and higher depending on dose and provider. Our breakdown of the Eli Lilly Mounjaro price increase explains what changed and what it means for private patients. Knowing there is no generic alternative is relevant context: the brand price is, for now, the only price.

Where can tirzepatide be prescribed in the UK, and what does that process involve?

In the UK, tirzepatide can be prescribed on the NHS through the phased rollout under NICE TA1026, or privately through a regulated online pharmacy or clinic. NHS access currently has strict eligibility thresholds and varies by area; many people turn to the private route because they do not meet NHS criteria yet or prefer not to wait. Explore the private treatment options available through regulated UK providers.

Through a regulated private service, the route is: a clinical consultation, same-day review by a GPhC-registered prescriber, and dispensing from a GPhC-registered pharmacy. No consultation means no prescription. No prescription means no dispensing. Our team at nume follows exactly that sequence, and our prescribers review each consultation personally, not through automated decision-making. Questions about whether a generic tirzepatide brand exists are common; the short answer is that they do not, and understanding that helps set realistic expectations about pricing and sourcing. If you are considering treatment and want to discuss whether Mounjaro is clinically suitable for you, check your eligibility with our prescribers.