Mounjaro doses: what the licensed schedule looks like and why it matters

What the licensed dose range tells us about how tirzepatide works

The NICE appraisal of tirzepatide (TA1026, recommendations chapter) reflects a body of evidence built across six dose levels. Tirzepatide is a dual GIP and GLP-1 receptor agonist, the only weight-management medicine licensed in the UK that activates both pathways simultaneously. Those two mechanisms together slow gastric emptying and reduce appetite signals, and the dose range exists because the magnitude of both effects scales with the strength prescribed.

In SURMOUNT-1, participants who reached 15 mg lost an average of around 20–21% of body weight over 72 weeks. That figure came from thousands of adults living with obesity, none of whom had type 2 diabetes. The gap between 2.5 mg and 15 mg isn't cosmetic: the therapeutic benefit accumulates as the dose rises, which is precisely why the schedule is progressive rather than fixed.

UK doses of Mounjaro for weight management follow the same range as those used for type 2 diabetes, though the titration rationale in the weight-management licence centres on tolerability first and efficacy second. A prescriber reads both goals simultaneously when deciding whether to advance your dose at any review.

Why 2.5 mg is where every Mounjaro course begins

The starter dose has one job: to let your body adjust to a medicine that meaningfully slows how quickly your stomach empties. At 2.5 mg, gastrointestinal side effects (nausea, bloating, loose stools) are far less likely to be severe, because the hormonal signal reaching the gut is modest. The first pen's purpose is adjustment, not weight loss.

After four weeks, if you're tolerating 2.5 mg well, a prescriber will typically advance to 5 mg. From there the pattern continues in 2.5 mg increments approximately every four weeks. If a dose increase causes difficult side effects, the right clinical response is often to stay at the current level for longer rather than push through. That decision belongs to your prescriber, not to a schedule on a wall chart.

You can read more about what the 5 mg stage involves (including what a pen at that strength contains) on our Mounjaro 5 mg guide. The broader question of how many usable injections each pen holds is covered separately on our how many doses of Mounjaro page.

One practical note worth making: when your first pen arrives, it comes in plain, unbranded packaging via DPD with a tracking link sent to your phone. Inside the box you'll find the KwikPen itself and the patient information leaflet, worth reading in full before your first injection, particularly the sections on missed doses and storage.

Dose increases, maintenance and what determines your ceiling

Not everyone reaches 15 mg, and that isn't a failure. The licensed approach is to titrate to the highest dose you tolerate well. For some people 10 mg delivers substantial results with minimal side effects; for others the full 15 mg is both well-tolerated and clinically important. There is no universally correct maintenance dose.

NICE's guidance specifies that if a patient loses less than 5% of their body weight after six months at the highest tolerated dose, continuing treatment should be reviewed. This threshold applies on the NHS; in private practice, the same clinical reasoning holds. A prescriber at a regulated service will assess whether the treatment is working for you before approving each repeat supply.

For those curious about the volume contained in each strength, our Mounjaro doses in ml page explains what the numbers mean in practical terms. People researching whether the pen format changes between doses may find our Mounjaro pen doses page useful for that specific question.

If you miss a scheduled injection (or experience side effects you think may be dose-related) the right first step is always the patient information leaflet and then your prescriber. Our missed dose and side effects page covers what the guidance says in plain language.

How dose decisions are handled at nume

At nume, no dose change is automated. Every repeat order, including those that involve moving to the next strength, is personally reviewed by a GPhC-registered Independent Prescriber before anything is dispensed. That review includes checking your recent weight, how you've been tolerating the current dose and whether advancing is clinically appropriate at this point.

The same process applies from day one. You complete a free consultation, a real clinician reads your answers the same day, and if treatment is suitable your prescription is issued and the pen dispatched, arriving free the next working day if you order before 12pm Monday to Friday. There are no subscriptions and no automatic renewals; every order goes through a fresh clinical review.

You can explore the full Mounjaro overview if you'd like context on the medicine before starting, or take a look at our weight-loss treatments page to check your eligibility and begin a free consultation. Our prescribers are also available for aftercare questions seven days a week. A question about whether your current dose is working as expected is exactly the kind of thing they're there for.