Is there a 17mg tirzepatide dose?

The misconception worth correcting: tirzepatide doses do not go above 15mg

The idea that a higher-than-licensed dose might produce faster results circulates in online forums, and it is easy to see why — people who have heard about tirzepatide's clinical trial results sometimes assume that more must mean better. It does not work that way here. The 15mg dose is the ceiling set by the medicine's regulators after extensive safety and efficacy testing. Going beyond it does not exist as a licensed option; a product labelled at 17mg or any other unlicensed figure has not passed MHRA scrutiny and cannot be verified for what it actually contains.

The MHRA has been direct about this risk. Fake weight-loss pens sold online, many described with plausible-sounding but fictitious specifications, have been found to contain substances including insulin, a medicine that can cause serious harm when given to someone who does not need it. Reporting suspect products can be done through the MHRA's Yellow Card scheme. That is the right place to flag anything that does not look legitimate.

So if the dose you have seen quoted is not 2.5, 5, 7.5, 10, 12.5, or 15mg, set it aside. The licensed range is the one that has been tested in thousands of adults across the SURMOUNT clinical programme, with results published in peer-reviewed journals. Anything outside it is, by definition, untested.

How the six licensed doses are actually used

Tirzepatide starts at 2.5mg, not as a treatment dose, but as a settling-in period. The body needs a few weeks to adjust to the way the medicine affects gastric emptying and appetite signalling. Nausea and digestive discomfort are most common in the early weeks; starting low reduces both. The NHS medicines page for tirzepatide explains the general pattern clearly.

From there, dose progression happens in 4-week steps, and only a prescriber decides whether an increase is appropriate. Factors that influence that decision include how well the current dose is tolerated, how much weight has been lost so far, and the patient's overall health picture. Some people stay on a middle dose, such as 7.5mg or 10mg, because it is working well and sits comfortably. Reaching 15mg is not a given, and it is not the point.

You can read more about how the full titration journey works on our Mounjaro treatment overview. The KwikPen device delivers each dose as a once-weekly subcutaneous injection, with storage in the fridge between uses. Injection sites rotate among the abdomen, thigh, and upper arm.

What the trial evidence shows at the licensed ceiling

At 15mg (the actual top of the range) tirzepatide produced an average body-weight reduction of around 20 to 21% over 72 weeks in SURMOUNT-1, a major phase 3 trial involving 2,539 adults with obesity. That is a substantial figure, and it helps explain why the medicine attracted so much attention so quickly. The SURMOUNT-5 trial, published in the New England Journal of Medicine in 2025, subsequently compared tirzepatide head-to-head with semaglutide 2.4mg and found greater average weight loss with tirzepatide. NICE reviewed this evidence in its appraisal of tirzepatide (TA1026, published December 2024) when recommending the medicine for NHS use under specific criteria.

These results were produced using the licensed doses under controlled clinical conditions, with dietary support and activity guidance alongside the medicine. A dose figure that sits outside the licensed range was not part of any of this research. Chasing a higher number on a label does not replicate those conditions; it creates a different and less predictable situation entirely.

If you are curious about what clinical results look like across the approved strength range, our tirzepatide dosing and licensing page covers what the evidence says at each specific dose level, and our tirzepatide 30 page goes into further detail on what is and is not available at the top of the licensed range.

How to get tirzepatide safely in the UK

Tirzepatide is a prescription-only medicine. The only legal and safe route to it is a prescription issued after a genuine clinical assessment. Private online services, including nume (sorry, including our pharmacy here at nume) operate within the licensed supply chain, which means the medicine dispensed carries the same quality assurance as any high-street dispensing.

The alternative, buying from an unverified seller promising strengths that do not exist in the licensed range, carries real physical risk. The cost difference rarely tells the whole story; what a legitimate private prescription includes is clinical oversight, verified identity checks, and a prescriber who has actually read your medical history.

You can verify any online pharmacy on the GPhC register before placing an order. Our Mounjaro price comparison page walks through what private UK pricing typically covers and what to look out for when comparing providers. For a broader look at your options, our weight-loss treatments overview covers everything currently available through a private prescription.

If you would like a prescriber to assess whether tirzepatide is right for you at any of its six licensed doses, start your free consultation with our clinical team.