Tirzepatide 30mg: why this dose doesn't exist in the UK

Step 1: understanding where the 30mg figure comes from

The 30mg search is more common than you might expect, and it usually comes from one of a few places. Some people encounter it on social media marketplaces or unverified online sellers. Others find it referenced in early-phase research, where scientists test a wide range of doses to find the right balance of effect and tolerability before a medicine reaches patients. In those early studies, higher doses were explored, but they did not become the licensed product. The version authorised by the MHRA for use in the UK tops out at 15mg.

There is also a simpler mix-up at play. Mounjaro's KwikPen contains four weekly doses; some people mistakenly multiply and arrive at numbers that have no clinical meaning. The arithmetic doesn't describe how the medicine works.

Sellers offering tirzepatide at doses outside the six licensed strengths are not supplying a licensed UK medicine. The MHRA has repeatedly warned about counterfeit and unlicensed weight-loss products circulating online, some fake pens have been found to contain insulin rather than the stated medicine. If you come across a product described as tirzepatide 30mg, that is a red flag worth reporting to the MHRA via the Yellow Card scheme.

Step 2: how the licensed titration schedule actually progresses

Tirzepatide treatment opens at 2.5mg. That first pen isn't there to produce weight loss; its job is to let the body adjust to the medicine, reducing the likelihood of nausea and other gastrointestinal side effects that are more pronounced when the dose starts high. Most people find any discomfort settles within a week or two.

After four weeks, the prescriber typically moves the dose up to 5mg, then 7.5mg, then 10mg, 12.5mg, and finally 15mg, each step roughly four weeks apart, though the pace is guided by individual tolerance and clinical response rather than a fixed timetable. Not everyone needs to reach 15mg, and not everyone will. The prescriber's goal is the lowest dose that achieves a meaningful clinical benefit for that person. The full tirzepatide overview sets out the dual GIP and GLP-1 mechanism that makes this titration approach particularly important.

The NHS medicines page for tirzepatide sets out the schedule and the reasoning behind it clearly, and the product's Summary of Product Characteristics (available via the electronic Medicines Compendium) contains the full prescribing detail that clinicians follow.

Step 3: what the evidence says about 15mg, the actual ceiling dose

SURMOUNT-1, the pivotal phase-3 trial, enrolled around 2,500 adults with obesity and followed them for 72 weeks. At the 15mg dose, average body-weight reduction was around 20–21%. That is a substantial clinical effect; the trial was published in the New England Journal of Medicine and formed the basis of NICE's recommendation of tirzepatide in TA1026. NICE published that appraisal in December 2024 and updated it in September 2025.

The point worth sitting with: there is no evidence that a 30mg dose would produce better results, and there is no approved mechanism for obtaining one safely in the UK. Research into higher doses in other contexts is ongoing science, not current clinical practice. If you want to understand how NICE's recommendation translates to private eligibility, the Mounjaro treatment page covers the criteria in plain terms. For a side-by-side look at how tirzepatide compares with the alternatives available, this comparison page may be useful.

Step 4: what to do if you've been offered tirzepatide 30mg

Don't use it. Report it. A product described as tirzepatide at a strength that has never been licensed is not a legitimate medicine, regardless of how it's packaged or what the seller says. Licensed tirzepatide in the UK is sold only as Mounjaro, only through a GPhC-registered pharmacy, and only following a clinical assessment by a prescriber. You can check whether any online pharmacy is properly registered using the GPhC's public register.

If you're considering treatment and unsure about what dose would be right for you, that's precisely the question a prescriber is there to answer. The dose you start on, and the pace at which it increases, depends on your health history, how you tolerate the medicine, and the clinical picture as a whole. If you are currently on a mid-range step and want more detail about your options, our tirzepatide 10mg page covers what to expect at that stage of the titration. Cost is sometimes a factor in these conversations too, our cost context page explains what legitimate UK treatment pricing covers and why the market looks the way it does.

At nume, every consultation is personally reviewed by a GPhC-registered Independent Prescriber, and no order is dispatched until that clinical review is complete. If you'd like to understand whether tirzepatide is appropriate for your situation, you're welcome to speak to our prescribers, the consultation is free, and there's no obligation to proceed. Patients who go on to reach the highest maintenance strength can find guidance on that final step in our tirzepatide 15mg page, which explains what to expect once you arrive there.