What doses of Mounjaro are there in the UK?

The myth that higher doses are always better (and why it quietly isn't true)

A common assumption is that everyone aims for 15 mg and that reaching it quickly means the treatment is working well. In practice, the opposite logic applies. The licensed schedule exists to reduce side effects (particularly nausea) not to race you to the ceiling. Many people find a meaningful reduction in appetite and body weight at 5 mg, 7.5 mg, or 10 mg, and their prescriber may hold at that dose for several months if it's working and is well tolerated. The NHS medicines guidance on tirzepatide confirms that the dose is titrated gradually; there is no clinical obligation to push to 15 mg if a lower dose is doing the job. Letting that assumption go quietly makes the treatment feel a lot less pressured.

The SURMOUNT-1 trial, which tested tirzepatide in adults with obesity over 72 weeks, compared all three maintenance doses (5 mg, 10 mg, and 15 mg) and found meaningful average weight reductions across all of them, with greater loss at higher doses. But "greater" on a population average does not mean a higher dose is the right choice for every individual; your prescriber weighs tolerability, your response so far, and your health picture as a whole.

What each dose in the Mounjaro schedule is designed to do

The 2.5 mg dose is the mandatory starting point for everyone, without exception. It does not meaningfully suppress appetite for most people; its role is to settle the gastrointestinal system before the dose increases. After four weeks, the prescriber typically moves the dose to 5 mg. From there, increases happen in 2.5 mg steps, roughly every four weeks, as clinically appropriate.

The doses from 5 mg upward are the working range. Some people find 5 mg sufficient; others respond progressively better as the dose climbs. The maximum licensed dose is 15 mg. Once a stable, effective dose is established, most people stay at that level for the duration of treatment rather than continuing to escalate. If you want a closer look at what the different doses of Mounjaro involve in practice, that guide covers how each one differs in meaningful detail. Our guide to Mounjaro's maintenance doses covers that in detail.

Each KwikPen contains four weekly doses. The pen is pre-filled; you do not draw up or measure anything. Injection sites are the abdomen, thigh, or upper arm, rotated weekly. Storage is in the refrigerator at 2–8°C; for the exact window during which a pen can be kept at room temperature before use, the Mounjaro Patient Information Leaflet on the eMC is the definitive reference, we don't publish a figure here because the clinical advice is always to check the leaflet directly.

Who the licensed dose schedule applies to (and what a prescriber looks at

The licensed indication for Mounjaro in weight management covers adults with a BMI of 30 or above, or adults with a BMI of 27 or above who also have at least one weight-related condition) such as high blood pressure, high cholesterol, obstructive sleep apnoea, or type 2 diabetes. Lower BMI thresholds apply for some ethnic backgrounds under UK clinical guidance. The full picture of what NICE recommends for NHS access is covered on the Mounjaro overview page.

A prescriber does not simply confirm your BMI and hand you a pen. They look at your full health history, any medicines you take, contraindications, and whether there are reasons to hold at a particular dose rather than escalate. Conditions such as a history of pancreatitis or certain gastrointestinal disorders require careful discussion. The dose schedule described here is the licensed framework; what happens within it is a clinical conversation, not a fixed conveyor belt.

Mounjaro carries a Black Triangle (▼) designation from the MHRA, meaning it is subject to additional monitoring. That is standard for newer medicines and not a cause for alarm; it simply means the regulator collects more data than usual during the medicine's early years in the UK market. If you've been searching under the generic name and want to understand what the doses of Mounjaro are, that page covers the same schedule with a focus on the tirzepatide perspective. The tirzepatide doses guide covers the same schedule from a slightly different angle if you've been searching under the generic name.

Cost and the dose question: what changes as the dose goes up

Private prescription pricing for Mounjaro in the UK does vary by dose. The 2.5 mg pen costs less than the 15 mg pen, and that gap widened after Eli Lilly revised its UK list prices in September 2025, a change that affected higher doses most sharply, with the 15 mg pen's list price reportedly rising to around £330 from around £122. If you're weighing up cost alongside treatment, the price increase explainer sets out what changed and why it matters for private patients.

At nume, one transparent price covers the clinical consultation, prescription, the treatment itself, and free next-working-day tracked delivery, no subscription and no hidden fees. Our weight-loss treatments page shows current pricing by dose. A prescriber reviews clinical suitability before every repeat order, including before any dose increase, which means the dose you pay for is always the dose a clinician has confirmed is right for you at that point.

If you'd like to discuss which dose is appropriate for where you are now, our prescribers are available seven days a week. Start your free consultation and your answers will be reviewed the same day by a GPhC-registered Independent Prescriber.