Is There a 120mg Tirzepatide Dose?

Where does the idea of tirzepatide 120mg come from?

It is a reasonable question, and one worth answering directly. A number of unlicensed sellers (operating via social media, messaging apps or unregistered websites) advertise weight-loss products using dose numbers that bear no relation to any approved medicine. Tirzepatide 120mg appears to be one such label, occasionally applied to counterfeit pens or compounded preparations that have not been assessed for safety or efficacy by the MHRA.

The MHRA has warned publicly and repeatedly about fake weight-loss pens sold through unofficial channels. In late 2025, enforcement teams seized roughly 20 million doses of illegally traded weight-loss medicines (worth around £45 million) and raided the first illicit UK manufacturing site producing counterfeit tirzepatide pens. Some earlier batches of counterfeit pens were found to contain insulin rather than the labelled medicine, leading to hospitalisations. You can report suspect sellers directly to the MHRA via Yellow Card.

If a product is labelled as tirzepatide at a dose you cannot find in the approved schedule, that is a serious red flag. Legitimate tirzepatide in the UK comes in a Lilly-branded KwikPen at one of six specific strengths, dispensed by a GPhC-registered pharmacy following a valid prescription.

What are the actual licensed tirzepatide strengths, and how does the schedule work?

The approved UK strengths are 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg and 15mg. Treatment begins at 2.5mg (a dose whose job is to let your system adjust gradually, not to produce immediate weight loss) and is titrated upward in roughly four-week steps by a prescriber, based on how well you are tolerating each level. The full overview of tirzepatide covers how the medicine works in more detail.

The 15mg pen is the highest available maintenance dose. Clinical trial data published in the New England Journal of Medicine showed average body-weight reductions of around 20–21% at 15mg over 72 weeks in adults with obesity who did not have type 2 diabetes, figures that placed tirzepatide ahead of previously available options. Those results come from a specific, regulated dose in a controlled programme, not from an escalating free-for-all. Moving through the schedule faster than recommended, or seeking a dose higher than 15mg, does not improve outcomes and substantially increases the risk of adverse effects.

Each pen sits in the fridge door between doses (straightforward enough) but the prescription, the dose and the timing are always decisions made with a clinician, not defaults to override.

Why does the dose ceiling matter for safety?

Tirzepatide carries a Black Triangle (▼) designation from the MHRA, meaning it is subject to additional post-marketing monitoring. The licensed dose range reflects the balance of efficacy and tolerability established across the SURMOUNT clinical programme, which involved thousands of adults. Going beyond 15mg is not simply a matter of taking more of the same thing, it means using a preparation for which there is no approved safety data in the UK.

The most common side effects of tirzepatide sit in the gastrointestinal category: nausea, vomiting, diarrhoea and constipation appear most often after starting or following a dose increase, and generally ease within a couple of weeks as the body adjusts. At higher-than-licensed doses, these effects would be expected to intensify without a corresponding benefit that has been shown in any regulated trial. More seriously, the MHRA has highlighted acute pancreatitis as an infrequent but potentially serious risk with GLP-1 class medicines, severe or persistent stomach pain that spreads to the back warrants urgent medical assessment, regardless of dose. The NHS tirzepatide patient information page sets out the full side-effect profile.

If you are already on a licensed tirzepatide dose and wondering whether a higher one would help, that is exactly the conversation to have with a prescriber. Our clinical team reviews every case individually, a dose increase at nume requires clinical evidence that it is appropriate, not just a request. You can read more about tirzepatide at the 90mg-equivalent maintenance doses and how the upper end of the schedule is managed.

What should you do if you have seen tirzepatide 120mg advertised?

Do not purchase it. A dose that does not appear in the licensed schedule is not a higher-strength version of an approved medicine, it is either a mislabelled product, a counterfeit, or an unlicensed compounded preparation, none of which have been assessed for the quality, safety or efficacy required under UK law. You can verify any pharmacy before buying from them by checking the GPhC pharmacy register, legitimate dispensing pharmacies appear there by name and registration number.

Understanding how tirzepatide is priced through legitimate UK channels is also useful context: prices that seem dramatically lower than the market range are often a sign that something is wrong with the supply chain, not a bargain. The weight-loss treatment options available through regulated UK pharmacies are clearly defined, with transparent pricing and a clinical review at every step. If you want to explore whether tirzepatide is clinically suitable for you, the right starting point is a proper consultation, not a product that skips that step entirely. You can also find specific information about tirzepatide 30mg and, if you are curious about how the titration schedule is structured across the full range, our page on tirzepatide l covers that in detail.